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Charalampos Vasilatos
Department of Economic Geology and Geochemistry, Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistiomiopolis, 15784 Zografou, Athens, Greece

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Journal article
Published: 07 August 2019 in Water
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Mediterranean Temporary Ponds (MTPs) constitute priority habitat under the European Union Habitats’ Directive. They are inhabited by rare species and subjected to unstable environmental conditions. Lakes and ponds act as early indicators of climate change, to which high altitude ecosystems are especially vulnerable. This study presents a full dataset of the geo-environmental parameters of such habitats (MTPs) along with their current ecological status for the first time. Furthermore, this paper aims to address the lack of basic geo-environmental background on the network of MTPs of Mt. Oiti concerning their geological, geomorphological, mineralogical and geochemical characteristics along with the pressures received from various activities. The study area is located in a mountainous Natura 2000 site of Central Greece, which hosts four MTPs. Fieldwork and sampling of water and bottom sediments were carried out during dry and wet periods between 2012 and 2014. Electrical Resistivity Tomography measurements identified synforms shaped under the ponds that topography does not always adopt them, mostly due to erosion procedures. The most significant feature, distinguishing those pond waters from any other province water bodies is the extremely low content of all studied ions (including NO2−, NO3−, NH4+, PO43−, HCO3−, SO42−, Al, As, B, Ba, Ca, Cd, Ce, Cl, Co, Cr, Cs, Cu, Fe, Ga, Gd, Ge, Hf, Hg, K, La, Li, Mg, Mn, Mo, Na, Ni, P, Rb, S, Sb, Se, Si, Sn, Sr, Ti, U, V, W, Zn, and Zr). MTPs water bodies are of bicarbonate dominant type, and a fresh meteoric water origin is suggested. The main pressures identified were grazing and trampling by vehicles. MTPs of Mt. Oiti were classified according to their ecological status form excellent to medium. Our results can contribute to a better understanding of the mountainous temporary ponds development in the Mediterranean environment.

ACS Style

Charalampos Vasilatos; Marianthi Anastasatou; John Alexopoulos; Emmanuel Vassilakis; Spyridon Dilalos; Sofia Antonopoulou; Stelios Petrakis; Pinelopi Delipetrou; Kyriacos Georghiou; Michael Stamatakis. Assessment of the Geo-Environmental Status of European Union Priority Habitat Type “Mediterranean Temporary Ponds” in Mt. Oiti, Greece. Water 2019, 11, 1627 .

AMA Style

Charalampos Vasilatos, Marianthi Anastasatou, John Alexopoulos, Emmanuel Vassilakis, Spyridon Dilalos, Sofia Antonopoulou, Stelios Petrakis, Pinelopi Delipetrou, Kyriacos Georghiou, Michael Stamatakis. Assessment of the Geo-Environmental Status of European Union Priority Habitat Type “Mediterranean Temporary Ponds” in Mt. Oiti, Greece. Water. 2019; 11 (8):1627.

Chicago/Turabian Style

Charalampos Vasilatos; Marianthi Anastasatou; John Alexopoulos; Emmanuel Vassilakis; Spyridon Dilalos; Sofia Antonopoulou; Stelios Petrakis; Pinelopi Delipetrou; Kyriacos Georghiou; Michael Stamatakis. 2019. "Assessment of the Geo-Environmental Status of European Union Priority Habitat Type “Mediterranean Temporary Ponds” in Mt. Oiti, Greece." Water 11, no. 8: 1627.

Conference paper
Published: 01 March 2019 in IOP Conference Series: Earth and Environmental Science
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The microstructure and geochemical composition of foraminiferal tests are valuable archives for the reconstruction of paleoclimatic and paleoecological changes. In this context, the late Miocene Globigerinoides obliquus shells from Faneromeni section (Crete Island) were investigated through Scanning Electron Microscopy (SEM) imaging, Energy Dispersive System (EDS) analysis and X-Ray Diffraction (XRD) spectroscopy in order to evaluate their potential as paleoenvironmental archives in the eastern Mediterranean. Investigation of diagenetic features, in late Miocene sediments from the Faneromeni section, shows that carbonate precipitation and cementation occur in various lithologies, particularly in carbonate-rich portions, such as bioclastic or clayey limestones. We identified 3 different diagenetic stages (early, intermediate, advanced), as a function of taphonomy in the study area. The comparison of microstructural and geochemical characteristics reveals a sequence of preservation states with "glassy" to "frosty" to "chalky" shells, indicative of the progressive diagenetic alteration of late Miocene planktic foraminiferal calcite. The early diagenetic stage occurs during the Tortonian, and consists of intermediates between "glassy" and "frosty" individuals. Around the Tortonian/Messinian (T/M) boundary at the second diagenetic stage, planktonic foraminifera have a clear "frosty" appearance, showing a gradual high-Mg calcite (to dolomite) crystal overgrowth development and dissolution of biogenic calcite. During the late Messinian and progressively through the Messinian Salinity Crisis (MSC), planktonic foraminifera present a "chalky" taphonomy. The additional precipitation of authigenic high-Mg inorganic calcite and dolomite crystals in the exterior of the tests characterizes the advanced diagenetic stage. The measured amount of diagenetic Mg-rich (10-14% molar Mg on average) calcite and/or dolomite coatings is compatible with results obtained on modern eastern Mediterranean core-top sediments. The assessment of such a diagenetic alteration contributes to a more precise reconstruction of sea surface temperatures (SSTs) during the Neogene, such that only when the changing proportions of the texture are accounted for, would geochemical measurements and subsequent paleoenvironmental interpretations be more meaningful. However, further investigations should extend this approach to test the robustness of our findings across a range of taphonomies, ages and burial settings.

ACS Style

Assimina Antonarakou; George Kontakiotis; Charalampos Vasilatos; Eva Besiou; Stergios D. Zarkogiannis; Hara Drinia; P. Graham Mortyn; Nikolaos Tsaparas; Panayota Makri; Vasileios Karakitsios. Evaluating the Effect of Marine Diagenesis on Late Miocene Pre-Evaporitic Sedimentary Successions of Eastern Mediterranean Sea. IOP Conference Series: Earth and Environmental Science 2019, 221, 012051 .

AMA Style

Assimina Antonarakou, George Kontakiotis, Charalampos Vasilatos, Eva Besiou, Stergios D. Zarkogiannis, Hara Drinia, P. Graham Mortyn, Nikolaos Tsaparas, Panayota Makri, Vasileios Karakitsios. Evaluating the Effect of Marine Diagenesis on Late Miocene Pre-Evaporitic Sedimentary Successions of Eastern Mediterranean Sea. IOP Conference Series: Earth and Environmental Science. 2019; 221 (1):012051.

Chicago/Turabian Style

Assimina Antonarakou; George Kontakiotis; Charalampos Vasilatos; Eva Besiou; Stergios D. Zarkogiannis; Hara Drinia; P. Graham Mortyn; Nikolaos Tsaparas; Panayota Makri; Vasileios Karakitsios. 2019. "Evaluating the Effect of Marine Diagenesis on Late Miocene Pre-Evaporitic Sedimentary Successions of Eastern Mediterranean Sea." IOP Conference Series: Earth and Environmental Science 221, no. 1: 012051.

Journal article
Published: 02 October 2018 in Bulletin of the Geological Society of Greece
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The aim of this paper is to evaluate the effects of natural and synthetic zeolitic materials as soil amendments in contaminated soils. Two species of natural zeolites, clinoptilolite and mordenite, sampled from Samos Island, Greece, were used as low-cost modifiers (amendments). Both of these materials show perfect XRD-patterns. Moreover, coal fly ash (CFA) derived from the electrostatic precipitators of the Meliti power plant (Florina, Greece) converted via an alkaline hydrothermal treatment with 1M NaOH was used to produce a synthetic zeolitic material. The mineralogical composition of natural and synthetic zeolites was tested and identified by X-ray diffraction (XRD) and scanning electron microscope (SEM). The amendments and original contaminated soils from a former mining area of Lavrion, were mixed and equilibrated for 1 week, hydrated up to 40% of their water holding capacity. After the equilibration, the growth of Trifolium alexandrinum both in amended and original soils was studied in a pot experiment. The increase in pH value of treated soil by the tested amendments, confirmed the buffering effect and suggested the opportunity of using zeolitic materials for conditioning and remedying contaminated acidic soils from sulphidic mining areas. Moreover, the amended soils exhibited higher CEC values compared with unamended soil. Results showed that the synthetic zeolite produced by Meliti’s power station fly ash, was the most effective for plant growth, among the tested amendments. Between natural zeolitic materials from Samos Island, the most efficient was the clinoptilolite rich, probably because of its better water holding capacity compared with mordenite.

ACS Style

Spyridoula Giannatou; Charalampos Vasilatos; Ioannis Mitsis; Nikolaos Koukouzas. Utilization of natural and synthetic zeolitic materials as soil amendments in abandoned mine sites. Bulletin of the Geological Society of Greece 2018, 53, 78 -98.

AMA Style

Spyridoula Giannatou, Charalampos Vasilatos, Ioannis Mitsis, Nikolaos Koukouzas. Utilization of natural and synthetic zeolitic materials as soil amendments in abandoned mine sites. Bulletin of the Geological Society of Greece. 2018; 53 (1):78-98.

Chicago/Turabian Style

Spyridoula Giannatou; Charalampos Vasilatos; Ioannis Mitsis; Nikolaos Koukouzas. 2018. "Utilization of natural and synthetic zeolitic materials as soil amendments in abandoned mine sites." Bulletin of the Geological Society of Greece 53, no. 1: 78-98.

Journal article
Published: 15 September 2018 in Science of The Total Environment
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The present study compiles new and literature data in a GIS platform aiming to (a) evaluate the extent and magnitude of Cr contamination in a Mediterranean region (Assopos-Thiva and Central Evia (Euboea) Basins, Greece); (b) combine spatial distribution of Cr in soil and groundwater with land use maps; (c) determine geochemical constraints on contamination by Cr; and (d) provide information that will be useful for better management of land use in a Mediterranean type ecosystem in order to prevent further degradation of natural resources. The spatial diversity of Cr distribution in soils and groundwater throughout the C. Evia and Assopos-Thiva Basins is considered. It is attributed to both natural Cr sources (Cr-bearing peridotites, affecting primarily soil) and human (industrial) activities (the dominant source of groundwater contamination). A combination of the spatial distribution of metals in soil and land use maps was used to define the specific areas of agricultural land use with elevated heavy metal contents. Furthermore, the combination of the spatial distribution of Cr in groundwater and land use maps allows for definition of specific areas of industrial land use with elevated Cr concentrations (Inofita, south Assopos-Thiva Basin). Despite the good correlation (r = 0.75) between Cr(VI) and the strong oxidant NO3− in C. Evia, the lower standard potential (E0) values for NO3− compared to those for Cr2O72− (the latter is a stronger oxidant than the former) suggest that NO3− is not an oxidant of Cr. This detailed assessment and presentation of the available analytical data for soil and groundwater in Assopos-Thiva and C. Evia Basins on a land use map provides information for land management decision makers.

ACS Style

Ifigeneia Megremi; Charalampos Vasilatos; Emmanuel Vassilakis; Maria Economou-Eliopoulos. Spatial diversity of Cr distribution in soil and groundwater sites in relation with land use management in a Mediterranean region: The case of C. Evia and Assopos-Thiva Basins, Greece. Science of The Total Environment 2018, 651, 656 -667.

AMA Style

Ifigeneia Megremi, Charalampos Vasilatos, Emmanuel Vassilakis, Maria Economou-Eliopoulos. Spatial diversity of Cr distribution in soil and groundwater sites in relation with land use management in a Mediterranean region: The case of C. Evia and Assopos-Thiva Basins, Greece. Science of The Total Environment. 2018; 651 ():656-667.

Chicago/Turabian Style

Ifigeneia Megremi; Charalampos Vasilatos; Emmanuel Vassilakis; Maria Economou-Eliopoulos. 2018. "Spatial diversity of Cr distribution in soil and groundwater sites in relation with land use management in a Mediterranean region: The case of C. Evia and Assopos-Thiva Basins, Greece." Science of The Total Environment 651, no. : 656-667.

Journal article
Published: 01 April 2018 in International Journal of Greenhouse Gas Control
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ACS Style

Nikolaos Koukouzas; Zacharenia Kypritidou; Gemma Purser; Christopher A. Rochelle; Charalampos Vasilatos; Nikolaos Tsoukalas. Assessment of the impact of CO2 storage in sandstone formations by experimental studies and geochemical modeling: The case of the Mesohellenic Trough, NW Greece. International Journal of Greenhouse Gas Control 2018, 71, 116 -132.

AMA Style

Nikolaos Koukouzas, Zacharenia Kypritidou, Gemma Purser, Christopher A. Rochelle, Charalampos Vasilatos, Nikolaos Tsoukalas. Assessment of the impact of CO2 storage in sandstone formations by experimental studies and geochemical modeling: The case of the Mesohellenic Trough, NW Greece. International Journal of Greenhouse Gas Control. 2018; 71 ():116-132.

Chicago/Turabian Style

Nikolaos Koukouzas; Zacharenia Kypritidou; Gemma Purser; Christopher A. Rochelle; Charalampos Vasilatos; Nikolaos Tsoukalas. 2018. "Assessment of the impact of CO2 storage in sandstone formations by experimental studies and geochemical modeling: The case of the Mesohellenic Trough, NW Greece." International Journal of Greenhouse Gas Control 71, no. : 116-132.

Journal article
Published: 08 March 2018 in Minerals
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The primary mineralization in the famous Lavrion mine in the Lavreotiki area, Attica (Greece), associated with a granodiorite intrusion of Upper Miocene age and composed of massive sulphide Pb-Zn-Ag ores [sphalerite, pyrite and galena (B.P.G)], has been extensively studied. The present study is focused on thin, hard, dark brown to black Fe-Mn crusts (a few mm to cm in thickness) in the Legrena valley, SW Lavreotiki, aiming to provide new insights on that type of Fe-Mn-mineralization. The scanning electron microscope (SEM)/energy dispersive spectroscopy (EDS) data presented revealed the presence of fine rounded fragments, resembling nodules (up to 200 μm) and fossilized bacteriomorphic Fe-Mn-oxides/hydroxides, within brecciated and foliated zones of carbonate rocks. They exhibit unusual features when compared to the common massive Fe-Mn mineralization with regards the following: (a) the extensive occurrence of bacteriomorphic Fe-oxides/hydroxides and their micro-textures; and (b) the minor elements (K, Na, P, S, Ca, As and Cl). The occurrence of abundant bacteriomophic Fe-Mn-oxides/hydroxides in the samples from the Legrena valley may reflect their catalytic role in the redox reactions during ore-forming processes. The characteristic features of that type of Fe-Mn mineralization seems to be the result of multistage supergene processes superimposed over initial hydrothermal stages. Such a multistage remobilization and precipitation of metals along open space surfaces on karstified carbonates during a subsequent stage of their initial precipitation may be widespread in the Attica region, Greece.

ACS Style

Charalampos Vasilatos; Maria Economou-Eliopoulos. Fossilized Bacteria in Fe-Mn-Mineralization: Evidence from the Legrena Valley, W. Lavrion Mine (Greece). Minerals 2018, 8, 107 .

AMA Style

Charalampos Vasilatos, Maria Economou-Eliopoulos. Fossilized Bacteria in Fe-Mn-Mineralization: Evidence from the Legrena Valley, W. Lavrion Mine (Greece). Minerals. 2018; 8 (3):107.

Chicago/Turabian Style

Charalampos Vasilatos; Maria Economou-Eliopoulos. 2018. "Fossilized Bacteria in Fe-Mn-Mineralization: Evidence from the Legrena Valley, W. Lavrion Mine (Greece)." Minerals 8, no. 3: 107.

Journal article
Published: 01 October 2017 in Applied Geochemistry
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Storage of CO2 into geological formations, such as deep saline aquifers and depleted oil/gas reservoirs, is being investigated to help reduce releases to the atmosphere. A critical issue is the long-term efficacy of engineered (man-made) hydrated cement seals that surround or plug boreholes. In order to investigate the impact of CO2 interactions with hydrated cement, the present study focuses on the alteration processes that were observed in a hydrated cement core (based on Type-G Portland cement) after laboratory experimental reaction with a CO2-saturated brine for 6 months. The carbonated cement block consisted of an orange outer zone, an alteration rim, and the intact cement core. The PHREEQC geochemical code was used to simulate the experimental conditions and data using 1D reactive transport modeling. The first phases to dissolve were portlandite, CS and ettringite providing calcium to solution. Three CaCO3 polymorphs were predicted to precipitate, but the less stable of these (aragonite, vaterite) were transformed to calcite over time. According to simulations the final product after 1000 years of reaction will be 68% calcite, 18% Friedel's salt and 14% Al-Fe-Si hydro/oxides. As the reaction front moved within the sample, porosity decreased due to the formation of amorphous phases and carbonates. The proposed model is a useful tool in describing longer-term hydrated cement alteration behavior during CO2 geological storage and to compare their results with in situ observations from field experiments

ACS Style

Nikolaos Koukouzas; Zacharenia Kypritidou; Charalampos Vasilatos; Nikolaos Tsoukalas; Christopher A. Rochelle; Gemma Purser. Geochemical modeling of carbonation of hydrated oil well cement exposed to CO 2 -saturated brine solution. Applied Geochemistry 2017, 85, 35 -48.

AMA Style

Nikolaos Koukouzas, Zacharenia Kypritidou, Charalampos Vasilatos, Nikolaos Tsoukalas, Christopher A. Rochelle, Gemma Purser. Geochemical modeling of carbonation of hydrated oil well cement exposed to CO 2 -saturated brine solution. Applied Geochemistry. 2017; 85 ():35-48.

Chicago/Turabian Style

Nikolaos Koukouzas; Zacharenia Kypritidou; Charalampos Vasilatos; Nikolaos Tsoukalas; Christopher A. Rochelle; Gemma Purser. 2017. "Geochemical modeling of carbonation of hydrated oil well cement exposed to CO 2 -saturated brine solution." Applied Geochemistry 85, no. : 35-48.

Journal article
Published: 01 September 2017 in Applied Geochemistry
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ACS Style

M. Economou-Eliopoulos; I. Megremi; Ch. Vasilatos; R. Frei; I. Mpourodimos; Charalampos Vasilatos. Geochemical constraints on the sources of Cr(VI) contamination in waters of Messapia (Central Evia) Basin. Applied Geochemistry 2017, 84, 13 -25.

AMA Style

M. Economou-Eliopoulos, I. Megremi, Ch. Vasilatos, R. Frei, I. Mpourodimos, Charalampos Vasilatos. Geochemical constraints on the sources of Cr(VI) contamination in waters of Messapia (Central Evia) Basin. Applied Geochemistry. 2017; 84 ():13-25.

Chicago/Turabian Style

M. Economou-Eliopoulos; I. Megremi; Ch. Vasilatos; R. Frei; I. Mpourodimos; Charalampos Vasilatos. 2017. "Geochemical constraints on the sources of Cr(VI) contamination in waters of Messapia (Central Evia) Basin." Applied Geochemistry 84, no. : 13-25.

Journal article
Published: 31 July 2017 in Bulletin of the Geological Society of Greece
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This paper reports, for the first time, the occurrence of an ash layer intercalated within the Plio-Pleistocene lacustrine deposits near Xylokastro area, North Peloponnesus, Greece. Petrographic and geochemical characteristics of the ash layer are the basis of this study. An attempt was made to correlate the present findings to the reported data from other ash deposits. The composition of the ash bed showed a dacitic to rhyolitic calc alkaline suit. The geochemistry of the volcanic ash indicates high crustal contamination of the lava and points to an origin from the northwest part of the Aegean volcanic arc.

ACS Style

Ch. Vasilatos; M. Vlachou-Tsipoura; M.G. Stamatakis. ON THE OCCURRENCE OF A VOLCANIC ASH LAYER IN THE XYLOKASTRO AREA, NORTH PELOPONNESUS, GREECE: MINERALOGY AND GEOCHEMISTRY. Bulletin of the Geological Society of Greece 2017, 43, 2773 -2785.

AMA Style

Ch. Vasilatos, M. Vlachou-Tsipoura, M.G. Stamatakis. ON THE OCCURRENCE OF A VOLCANIC ASH LAYER IN THE XYLOKASTRO AREA, NORTH PELOPONNESUS, GREECE: MINERALOGY AND GEOCHEMISTRY. Bulletin of the Geological Society of Greece. 2017; 43 (5):2773-2785.

Chicago/Turabian Style

Ch. Vasilatos; M. Vlachou-Tsipoura; M.G. Stamatakis. 2017. "ON THE OCCURRENCE OF A VOLCANIC ASH LAYER IN THE XYLOKASTRO AREA, NORTH PELOPONNESUS, GREECE: MINERALOGY AND GEOCHEMISTRY." Bulletin of the Geological Society of Greece 43, no. 5: 2773-2785.

Journal article
Published: 21 March 2017 in Geosciences
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The ophiolitic rocks of the Attic-Cycladic crystalline belt are considered of key importance for understanding the Mesozoic tectonic evolution of the Aegean region. Unresolved questions concern their tectono-stratigraphic relationships across the region. The mode of occurrence of the Cycladic ophiolites varies, as they appear as: (a) dismembered blocks (olistoliths) within the supra-detachment units of Paros and Naxos; (b) mélange formations in the upper structural unit of western Samos and Skyros; and (c) meta-ophiolitic mélange in the Cycladic Blueschist Unit (CBU) from central Samos. The trace element geochemistry and Pb-Sr-Nd isotopes of the mafic ophiolitic rocks indicate four geochemical groups: (a) the upper unit metabasites from Paros and western Samos (Kallithea) display an evolved basaltic composition (Mg# 40.2–59.6), with low Zr/Nb values (5–16) and high Ce/Y values (1.3 to 2.6) compared to MORB, indicating island-arc tholeiite affinities; (b) Naxos upper unit metabasalts show spider diagrams patterns indicating ocean island basalt (OIB-type) affinities; (c) Central Samos metagabbros (CBU) are primitive rocks with Back-Arc Basin basalt affinities; (d) the Skyros metadolerites and Tinos (Mt Tsiknias) and S. Evia (CBU) metagabbros, cluster as a separate geochemical group; they exhibit high MgO values (>10 wt %), very low TiO2 values (0.1–0.2 wt %), Y and Yb, and depleted trace element N-MORB normalized patterns, similar to volcanic rocks formed in modern oceanic fore-arc settings, such as boninites. A combination of the Pb- and Sr-isotopic compositions of Cycladic metabasites indicate that the Pb and Sr incorporated in the Cycladic ophiolites correspond to mixtures of magmatic fluids with seawater (206Pb/204Pb = 18.51–18.80; 207Pb/204Pb = 15.59–15.7; 208Pb/204Pb = 39.03–39.80 and initial 87Sr/86Sr80 = 0.705–0.707). Furthermore, peridotite relicts from Samos, Paros, and Naxos—irrespective of the structural unit—display chemical affinities of ocean floor peridotites formed in a supra-subduction zone. The characteristics of harzburgite relicts in Cycladic serpentinites and Skyros indicate a highly residual nature of the mantle source. Geochemical data from this study shed further light on the complex structure of the oceanic lithosphere from which the Cycladic ophiolites originated.

ACS Style

Christina Stouraiti; Iakovos Pantziris; Charalampos Vasilatos; Christos Kanellopoulos; Panagiotis Mitropoulos; Panagiotis Pomonis; Robert Moritz; Massimo Chiaradia. Ophiolitic Remnants from the Upper and Intermediate Structural Unit of the Attic-Cycladic Crystalline Belt (Aegean, Greece): Fingerprinting Geochemical Affinities of Magmatic Precursors. Geosciences 2017, 7, 14 .

AMA Style

Christina Stouraiti, Iakovos Pantziris, Charalampos Vasilatos, Christos Kanellopoulos, Panagiotis Mitropoulos, Panagiotis Pomonis, Robert Moritz, Massimo Chiaradia. Ophiolitic Remnants from the Upper and Intermediate Structural Unit of the Attic-Cycladic Crystalline Belt (Aegean, Greece): Fingerprinting Geochemical Affinities of Magmatic Precursors. Geosciences. 2017; 7 (1):14.

Chicago/Turabian Style

Christina Stouraiti; Iakovos Pantziris; Charalampos Vasilatos; Christos Kanellopoulos; Panagiotis Mitropoulos; Panagiotis Pomonis; Robert Moritz; Massimo Chiaradia. 2017. "Ophiolitic Remnants from the Upper and Intermediate Structural Unit of the Attic-Cycladic Crystalline Belt (Aegean, Greece): Fingerprinting Geochemical Affinities of Magmatic Precursors." Geosciences 7, no. 1: 14.

Conference paper
Published: 18 October 2016 in IOP Conference Series: Earth and Environmental Science
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The Messada pluton is a mafic intrusion that is located about 12 km SW of Serres town, (Macedonia Greece) that intrudes the two mica, biotite and the augen gneisses of the Vertiskos formation (Serbo-Macedonian massif). The aim of this study is to investigate, define and evaluate the geochemical characteristics of the pluton in order to determine the geotectonic environment in which the parental magma has been formed. The Mesada pluton is a mid to coarse grained intrusion presenting petrographic variety from diorite and quartz diorite to tonalite and granodiorite. The variety in petrography reflects its chemical inhomogeneity in major and trace elements. It is suggested that parts of pluton have been formed by distinctly different types of magmas originated in diverse geotectonic settings. Those parts of quartz diorite and tonalite composition, present similar geochemical characteristics, LILE/HFSE ratios and negative Nb, but no Ti anomalies in their primitive mantle normalized trace elements spider grams. They exhibit higher HFS values than those of granodioritic composition. Moreover, their ORG normalized spider grams not only suggest that they have been evolved by a common parental magma, but also present the typical characteristics of a "crust dominated" within plate pluton that may have been formed in an early stage during rifting, prior to a subsequent subduction episode. This interpretation may be in accordance with the suggestion for the Gondwanian origin of the more silicic Triassic rift related meta-granites (e.g. Arnea plutonic complex) of the Serbo-Macedonian massif. In contrary; the parts of Mesada pluton of granodioritic composition, exhibit a calc-alkaline to high K calc-alkaline magmatic suite and present higher LILE/HFSE and LREE/HREE ratios, related to a higher crustal component contribution for the magma genesis. Furthermore, their primitive mantle normalized spider grams' present negative anomalies at Nb and Ti. These characteristics indicate that those granodioritic parts have been formed by the crystallization of a calk-alkaline magma, produced by the partial melting of lower crust, lithospheric mantle and asthenospheric mantle components, in a volcanic arc geo-tectonic setting. Their geochemical characteristics have close similarities to those of the collision related granitoids that have intruded the Serbo- Macedonian during Tertiary.

ACS Style

Charalampos Vasilatos. Dichotomy of The Messada Pluton, Serbo-Macedonian Massif, Greece: From Rifting to Subduction. IOP Conference Series: Earth and Environmental Science 2016, 44, 042009 .

AMA Style

Charalampos Vasilatos. Dichotomy of The Messada Pluton, Serbo-Macedonian Massif, Greece: From Rifting to Subduction. IOP Conference Series: Earth and Environmental Science. 2016; 44 (4):042009.

Chicago/Turabian Style

Charalampos Vasilatos. 2016. "Dichotomy of The Messada Pluton, Serbo-Macedonian Massif, Greece: From Rifting to Subduction." IOP Conference Series: Earth and Environmental Science 44, no. 4: 042009.

Journal article
Published: 23 September 2016 in Archives of Agronomy and Soil Science
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ACS Style

Michael G. Stamatakis; Ioanna Stefania Stamataki; Spyridoula Giannatou; Charalampos Vasilatos; Foteini Drakou; Ioannis Mitsis; Katerina Xinou. Characterization and evaluation of chabazite- and mordenite-rich tuffs, and their mixtures as soil amendments and slow release fertilizers. Archives of Agronomy and Soil Science 2016, 63, 735 -747.

AMA Style

Michael G. Stamatakis, Ioanna Stefania Stamataki, Spyridoula Giannatou, Charalampos Vasilatos, Foteini Drakou, Ioannis Mitsis, Katerina Xinou. Characterization and evaluation of chabazite- and mordenite-rich tuffs, and their mixtures as soil amendments and slow release fertilizers. Archives of Agronomy and Soil Science. 2016; 63 (6):735-747.

Chicago/Turabian Style

Michael G. Stamatakis; Ioanna Stefania Stamataki; Spyridoula Giannatou; Charalampos Vasilatos; Foteini Drakou; Ioannis Mitsis; Katerina Xinou. 2016. "Characterization and evaluation of chabazite- and mordenite-rich tuffs, and their mixtures as soil amendments and slow release fertilizers." Archives of Agronomy and Soil Science 63, no. 6: 735-747.

Journal article
Published: 21 December 2015 in Greenhouse Gases: Science and Technology
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Natural CO2 fields can be used to identify trapping mechanisms, the fate and the geochemical consequences of geologically stored CO2 in shallow aquifers. The Florina Basin in Greece is regarded as a CO2 naturally leaking analog due to millions of years of gas accumulation in a Tertiary sand formation. This research was conducted in order to identify the CO2 fingerprints and to investigate and evaluate the factors controlling the groundwater quality in the basin. Leaking CO2 is observed in the aquifers and at the surface. The basin is filled with clastic sediments. It can provide information regarding the fate of CO2 and the possible impacts that can be used as reference in demonstration and industrial projects. Water sampling campaigns were conducted to determine the impact of the gas-water long-term interactions in the shallow aquifers. The CO2 has increased the concentration (in relation to other water samples from the basin) of certain elements like Fe, Mn, Na, Cl, and Br but only in few cases exceeds the EU drinking limit. The chemistry of the groundwater in the Florina Basin aquifers was found to be controlled mainly by the CO2-water-rock interactions due to the mineralogy of the aquifers (calcite and silicates including pyroxenes and chlorite). Metal attenuation processes have prevented the aquifers from brine contamination. Considering the Florina Basin is a natural analog for studying the leaking and migration pathways of stored CO2 and that only minor affects have been identified in the groundwater chemistry, the conclusions of this research are promising for the possible usage of a basin of similar geology and lithology for deep CO2 storage. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

ACS Style

Vasiliki Gemeni; Charalampos Vasilatos; Nikolaos Koukouzas; Christos Kanellopoulos. Geochemical consequences in shallow aquifers from the long-term presence of CO2in a natural field: The case of Florina Basin, W. Macedonia, Greece. Greenhouse Gases: Science and Technology 2015, 6, 450 -469.

AMA Style

Vasiliki Gemeni, Charalampos Vasilatos, Nikolaos Koukouzas, Christos Kanellopoulos. Geochemical consequences in shallow aquifers from the long-term presence of CO2in a natural field: The case of Florina Basin, W. Macedonia, Greece. Greenhouse Gases: Science and Technology. 2015; 6 (4):450-469.

Chicago/Turabian Style

Vasiliki Gemeni; Charalampos Vasilatos; Nikolaos Koukouzas; Christos Kanellopoulos. 2015. "Geochemical consequences in shallow aquifers from the long-term presence of CO2in a natural field: The case of Florina Basin, W. Macedonia, Greece." Greenhouse Gases: Science and Technology 6, no. 4: 450-469.

Journal article
Published: 01 June 2015 in International Journal of Mineral Processing
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Grigorios Itskos; Athanasios Koutsianos; Nikolaos Koukouzas; Charalampos Vasilatos. Zeolite development from fly ash and utilization in lignite mine-water treatment. International Journal of Mineral Processing 2015, 139, 43 -50.

AMA Style

Grigorios Itskos, Athanasios Koutsianos, Nikolaos Koukouzas, Charalampos Vasilatos. Zeolite development from fly ash and utilization in lignite mine-water treatment. International Journal of Mineral Processing. 2015; 139 ():43-50.

Chicago/Turabian Style

Grigorios Itskos; Athanasios Koutsianos; Nikolaos Koukouzas; Charalampos Vasilatos. 2015. "Zeolite development from fly ash and utilization in lignite mine-water treatment." International Journal of Mineral Processing 139, no. : 43-50.

Journal article
Published: 15 January 2015 in Open Geosciences
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This paper presents an investigation of naturally occurring CO2 emissions from the Florina natural analogue site in Greece. The main objective was to interpret previously collected depth sounding data, convert them into surfaces, and use them as input to develop, for the first time, 3D geological models of the Florina basin. By also locating the extent of the aquifer, the location of the CO2 source, the location of other natural CO2 accumulations, and the points where CO2 reaches the surface, we were able to assess the potential for CO2 leakage. Geological models provided an estimate of the lithological composition of the Florina Basin and allowed us to determine possible directions of groundwater flow and pathways of CO2 flow throughout the basin. Important modelling parameters included the spatial positions of boundaries, faults, and major stratigraphic units (which were subdivided into layers of cells). We used various functions in Petrel software to first construct a structural model describing the main rock boundaries.We then defined a 3D mesh honouring the structural model, and finally we populated each cell in the mesh with geologic properties, such as rock type and relative permeability. According to the models, the thickest deposits are located around Mesochorion village where we estimate that around 1000 m of sediments were deposited above the basement. Initiation of CO2 flow at Florina Basin could have taken place between 6.5 Ma and 1.8 Ma ago. The NESW oriented faults, which acted as fluid flow pathways, are still functioning today, allowing for localised leakage at the surface. CO2 leakage may be spatially variable and episodic in rate. The episodicity can be linked to the timing of Almopia volcanic activity in the area.

ACS Style

Nikolaos Koukouzas; Alexandros Tasianas; Vasiliki Gemeni; Dimitrios Alexopoulos; Charalampos Vasilatos. Geological modelling for investigating CO2 emissions in Florina Basin, Greece. Open Geosciences 2015, 7, 1 .

AMA Style

Nikolaos Koukouzas, Alexandros Tasianas, Vasiliki Gemeni, Dimitrios Alexopoulos, Charalampos Vasilatos. Geological modelling for investigating CO2 emissions in Florina Basin, Greece. Open Geosciences. 2015; 7 (1):1.

Chicago/Turabian Style

Nikolaos Koukouzas; Alexandros Tasianas; Vasiliki Gemeni; Dimitrios Alexopoulos; Charalampos Vasilatos. 2015. "Geological modelling for investigating CO2 emissions in Florina Basin, Greece." Open Geosciences 7, no. 1: 1.

Journal article
Published: 01 January 2015 in Neues Jahrbuch für Mineralogie - Abhandlungen
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Alireza Eslami; Michael G. Stamatakis; Maria Perraki; Charalampos Vasilatos; Luke Hollingbery. On the occurrence of Mg- and Fe-rich carbonate mineral assemblages hosted in the Nain ophiolite mélange, Central Iran and their industrial potential. Neues Jahrbuch für Mineralogie - Abhandlungen 2015, 192, 59 -71.

AMA Style

Alireza Eslami, Michael G. Stamatakis, Maria Perraki, Charalampos Vasilatos, Luke Hollingbery. On the occurrence of Mg- and Fe-rich carbonate mineral assemblages hosted in the Nain ophiolite mélange, Central Iran and their industrial potential. Neues Jahrbuch für Mineralogie - Abhandlungen. 2015; 192 (1):59-71.

Chicago/Turabian Style

Alireza Eslami; Michael G. Stamatakis; Maria Perraki; Charalampos Vasilatos; Luke Hollingbery. 2015. "On the occurrence of Mg- and Fe-rich carbonate mineral assemblages hosted in the Nain ophiolite mélange, Central Iran and their industrial potential." Neues Jahrbuch für Mineralogie - Abhandlungen 192, no. 1: 59-71.

Journal article
Published: 01 January 2015 in Procedia Earth and Planetary Science
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Acid mine drainage is an extensively documented environmental issue, commonly originated by the weathering of sulfide ores both in active and abandoned mining sites. Even though national and international regulations obliged mining companies to handle this problem in active mines, in the abandoned ones it is usually regarded as a major environmental thread. Natural attenuation is a term that is used to describe a combination of in situ physical, chemical and biological processes that under some specific conditions, act without human interventions in order to reduce the mass, toxicity, mobility and concentration of metals in soil or groundwater” (USEPA, 1999). For those processes, the local lithology may plays a key role, when contributing to an alkaline environment, consequent the precipitation of metals in the form of hydroxides. Despite of the fact that in Ermioni, Greece, a mixed sulfide ore mine had been operational since 1928, it has been abandoned after 1978 and no restoration actions have been implemented. Dispersed ore tailings have been deposited near the galleries, being exposed to atmospheric conditions. Soil and mine-water samples were collected from the region of that abandoned mine. The soil was collected from tailings at superficial points near the mining galleries, while water was sampled from canals, which drain from the mining galleries to the nearby Roros River. The mineralogical composition of the soil samples was studied by X-ray Diffraction Spectroscopy and Scanning Electron Microscopy, while Flame Atomic Adsorption Spectroscopy was applied for the determination of the Fe, Zn, Cd, Cu, Pb, Mn, Ni, Co, Cr and Hg concentrations in the water samples.

ACS Style

Charalampos Vasilatos; Nikolaos Koukouzas; Dimitrios Alexopoulos. Geochemical Control of Acid Mine Drainage in Abandoned Mines: The Case of Ermioni Mine, Greece. Procedia Earth and Planetary Science 2015, 15, 945 -950.

AMA Style

Charalampos Vasilatos, Nikolaos Koukouzas, Dimitrios Alexopoulos. Geochemical Control of Acid Mine Drainage in Abandoned Mines: The Case of Ermioni Mine, Greece. Procedia Earth and Planetary Science. 2015; 15 ():945-950.

Chicago/Turabian Style

Charalampos Vasilatos; Nikolaos Koukouzas; Dimitrios Alexopoulos. 2015. "Geochemical Control of Acid Mine Drainage in Abandoned Mines: The Case of Ermioni Mine, Greece." Procedia Earth and Planetary Science 15, no. : 945-950.

Journal article
Published: 09 April 2013 in Geosciences
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The investigation of the contamination in soil, plants and groundwater revealed a spatial evolution, with an increasing trend in the Cr, Fe, Ni, Mn and Co contents in soils from the Assopos to Thiva basin, followed by C. Evia and Ni-laterite deposits, suggesting that the latter and their parent ophiolites are a potential source for these metals. In contrast, the contamination in groundwater by Cr(VI), ranging from 2 to 360 μg/L Cr, and a varying degree of salinization is probably due to both human activities and natural processes. A diverse source for the contamination of soil and groundwater in the Assopos-Thiva basins is consistent with the increasing trend of the Mg/Si ratio and Cr(VI) concentration in water. The use of deep karst-type aquifer instead of the shallow-Neogene one may provide a solution to the crucial environmental problem. The selective extraction by EDTA and alkaline solution showed that Cr and Fe are less available than Mn. The Cr contents in plants range from <1 to tens of mg/kg, due probably to the high resistance of chromite. However, the average Crtotal contents in plants/crops are higher than normal or sufficient values, whilst Crtotal accumulation [(% metals in plants × 100)/metal in soil] and Cr(VI) accumulation are relatively low. There is a very good positive correlation between accumulation factors for Cr and Fe (R2 = 0.92), suggesting a similarity concerning their uptake.

ACS Style

Maria Economou-Eliopoulos; Ifigeneia Megremi; Cathy Atsarou; Christina Theodoratou; Charalambos Vasilatos. Spatial Evolution of the Chromium Contamination in Soils from the Assopos to Thiva Basin and C. Evia (Greece) and Potential Source(s): Anthropogenic versus Natural Processes. Geosciences 2013, 3, 140 -158.

AMA Style

Maria Economou-Eliopoulos, Ifigeneia Megremi, Cathy Atsarou, Christina Theodoratou, Charalambos Vasilatos. Spatial Evolution of the Chromium Contamination in Soils from the Assopos to Thiva Basin and C. Evia (Greece) and Potential Source(s): Anthropogenic versus Natural Processes. Geosciences. 2013; 3 (2):140-158.

Chicago/Turabian Style

Maria Economou-Eliopoulos; Ifigeneia Megremi; Cathy Atsarou; Christina Theodoratou; Charalambos Vasilatos. 2013. "Spatial Evolution of the Chromium Contamination in Soils from the Assopos to Thiva Basin and C. Evia (Greece) and Potential Source(s): Anthropogenic versus Natural Processes." Geosciences 3, no. 2: 140-158.

Journal article
Published: 01 July 2012 in Geoscience Frontiers
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An integrated approach was performed on the soil, plant-crops and groundwater system at the Thiva basin, to evaluate the extent and intensity of the heavy metal contamination, the percentage of metals transferred into plants/crops (bio-accumulation) and the potential sources of contamination.Heavy metal contents (230–310 Cr, 1200–2200 Ni, 50–80 Co, 880–1150Mn and 44,500–66,200 Fe all in ppm ) in the Thiva soils are higher than those in the Assopos basin. An increasing trend in the heavy metal contents, from the Assopos to the Thiva basin (Mouriki), indicates that the metal source is probably the Ni-laterites and ophiolites, located towards north. On the other hand, groundwater samples from domestic and irrigation wells throughout the Thiva basin exhibit relatively low (8–37ppb) concentrations in Cr compared to the Assopos (up to 150ppb). The plots of Cr versus Mg/Ca, Mg/Na versus Ca/Na, B versus Si/(Si+Na) and Mg/Si versus Ca/Si ratios revealed a low degree of salinization in the Thiva compared to that in the Assopos (Avlida) basin. The low Cr concentration (average 23ppb, during dry period) in the Thiva wells may be related with their depth (>120m), in contrast to shallow wells in the central Euboea (hundreds ppb Cr) and points to a solution of a crucial environmental problem in Euboea and Assopos basin by using the deep karst-type aquifer instead the shallow-Neogene one.The average Cr contents (dry weight) ranges from 1.7 to 4.6ppm (average 2.2) in carrots, potatoes and onions. The percentage of soil metals Crtotal, Cr(VI), Ni, Mn and Fe ranges between 0.06 and 3.2 (average 0.53±0.4), whilst that for Cu and Zn ranges from 16 to 81 (average 36±24). The Cr transfer to plants is low, due to the high resistance of chromite (main host of Cr), but the determined Cr contents in plant-crops in the Thiva basin are higher than normal or sufficient values. Although minimal uptake for growth and production for Cr, Ni, Zn and Cu is still lacking, furthermore research is required in order to restrict heavy metal accumulation and ensure sustainability

ACS Style

M. Economou-Eliopoulos; D. Antivachi; Charalampos Vasilatos; I. Megremi. Evaluation of the Cr(VI) and other toxic element contamination and their potential sources: The case of the Thiva basin (Greece). Geoscience Frontiers 2012, 3, 523 -539.

AMA Style

M. Economou-Eliopoulos, D. Antivachi, Charalampos Vasilatos, I. Megremi. Evaluation of the Cr(VI) and other toxic element contamination and their potential sources: The case of the Thiva basin (Greece). Geoscience Frontiers. 2012; 3 (4):523-539.

Chicago/Turabian Style

M. Economou-Eliopoulos; D. Antivachi; Charalampos Vasilatos; I. Megremi. 2012. "Evaluation of the Cr(VI) and other toxic element contamination and their potential sources: The case of the Thiva basin (Greece)." Geoscience Frontiers 3, no. 4: 523-539.

Journal article
Published: 19 January 2012 in Journal of Materials Science
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Eight types of A356 Al–fly ash composites were produced by pressure infiltration of high-Ca lignite fly ash. This type of ash was used for the first time in Al-composites synthesis, and particularly by liquid metal infiltration techniques. After examining mineralogy and chemistry, specific, narrow ash size fractions were used for the synthesis of composites, and properties linked to microstructure and wear strength of the materials. The effect of using ground ash particles on the microstructure and tribological performance of the composites was also investigated. It was concluded that using fine, high-Ca ash particles can improve the properties of composites, and that using ash particles in a ground form can better facilitate the production process of MMCs.

ACS Style

Grigorios Itskos; Pradeep K. Rohatgi; Angeliki Moutsatsou; John D. DeFouw; Nikolaos Koukouzas; Charalampos Vasilatos; Benjamin F. Schultz. Synthesis of A356 Al–high-Ca fly ash composites by pressure infiltration technique and their characterization. Journal of Materials Science 2012, 47, 4042 -4052.

AMA Style

Grigorios Itskos, Pradeep K. Rohatgi, Angeliki Moutsatsou, John D. DeFouw, Nikolaos Koukouzas, Charalampos Vasilatos, Benjamin F. Schultz. Synthesis of A356 Al–high-Ca fly ash composites by pressure infiltration technique and their characterization. Journal of Materials Science. 2012; 47 (9):4042-4052.

Chicago/Turabian Style

Grigorios Itskos; Pradeep K. Rohatgi; Angeliki Moutsatsou; John D. DeFouw; Nikolaos Koukouzas; Charalampos Vasilatos; Benjamin F. Schultz. 2012. "Synthesis of A356 Al–high-Ca fly ash composites by pressure infiltration technique and their characterization." Journal of Materials Science 47, no. 9: 4042-4052.