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Dr. Evangelos Tzamos
Department of Chemistry, Aristotle University of Thessaloniki, Greece

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0 circular economy
0 materials characterization
0 Mineral resources
0 Field Geology
0 Critical Raw Materials

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Mineralogy and geochemistry of ore deposits
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Journal article
Published: 27 August 2021 in Sustainability
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Acid mine drainage and potentially toxic elements release are a major source of pollution in sulfide-rich mining sites. Pyrite is the most impacting mineral due to its high acidification potential when it reacts with water under oxidizing conditions. At the Fushe Arrez dressing plant in Northern Albania, a volcanic massive sulfide copper mining district, pyrite was in past separated, with a double flotation process, to produce a pyrite concentrate and relatively-pyrite-poor tailings. In the last twenty years single flotation has replaced the double flotation process and pyrite has been deposited in pyrite-rich tailings stacked separately from the old ones. The study of the solid tailing materials and natural waters flowing through the dumping area, together with leaching tests show that waters interacting with single flotation tailings are slightly more acidic and much higher in total metal contents than those interacting with double flotation tailings. Also, the metal distribution is different, with the former being higher in sulfide-hosted metals and the latter higher in gangue-hosted metals. It is thus suggested that separation of pyrite can play an important role in the sustainable mining of pyrite-rich ores, either for dumping high hazardous pyrite concentrate separately or for marketing it as a by-product. An implementation of studies for the industrial uses of pyrite is pivotal in this last case.

ACS Style

Giovanni Grieco; Agim Sinojmeri; Micol Bussolesi; Giuseppe Cocomazzi; Alessandro Cavallo. Environmental Impact Variability of Copper Tailing Dumps in Fushe Arrez (Northern Albania): The Role of Pyrite Separation during Flotation. Sustainability 2021, 13, 9643 .

AMA Style

Giovanni Grieco, Agim Sinojmeri, Micol Bussolesi, Giuseppe Cocomazzi, Alessandro Cavallo. Environmental Impact Variability of Copper Tailing Dumps in Fushe Arrez (Northern Albania): The Role of Pyrite Separation during Flotation. Sustainability. 2021; 13 (17):9643.

Chicago/Turabian Style

Giovanni Grieco; Agim Sinojmeri; Micol Bussolesi; Giuseppe Cocomazzi; Alessandro Cavallo. 2021. "Environmental Impact Variability of Copper Tailing Dumps in Fushe Arrez (Northern Albania): The Role of Pyrite Separation during Flotation." Sustainability 13, no. 17: 9643.

Journal article
Published: 22 October 2020 in Minerals
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The importance of magnesite for the EU economy and industry is very high, making the understanding of their genesis for the exploration for new deposits a priority for the raw materials scientific community. In this direction, the study of the magnesite-hosting ultramafic rocks can be proved very useful. For the present study, ultramafic rock samples were collected from the magnesite ore-hosting ophiolite of the Gerakini mining area (Chalkidiki, Greece) to investigate the consecutive alteration events of the rocks which led to the metallogenesis of the significant magnesite ores of the area. All samples were subjected to a series of analytical methods for the determination of their mineralogical and geochemical characteristics: optical microscopy, XRD, SEM, EMPA, ICP–MS/OES and CIPW normalization. The results of these analyses revealed that the ultramafic rocks of the area have not only all been subjected to serpentinization, but these rocks have also undergone carbonation, silification and clay alteration. The latter events are attributed to the circulation of CO2-rich fluids responsible for the formation of the magnesite ores and locally, the further alteration of the serpentinites into listvenites. The current mineralogy of these rocks was found to be linked to one or more alteration event that took place, thus a significant contribution to the metallo- and petrogenetic history of the Gerakini ophiolite has been made. Furthermore, for the first time in literature, Fe inclusions in olivines from Greece were reported.

ACS Style

Evangelos Tzamos; Micol Bussolesi; Giovanni Grieco; Pietro Marescotti; Laura Crispini; Andreas Kasinos; Niccolò Storni; Konstantinos Simeonidis; Anastasios Zouboulis. Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece). Minerals 2020, 10, 934 .

AMA Style

Evangelos Tzamos, Micol Bussolesi, Giovanni Grieco, Pietro Marescotti, Laura Crispini, Andreas Kasinos, Niccolò Storni, Konstantinos Simeonidis, Anastasios Zouboulis. Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece). Minerals. 2020; 10 (11):934.

Chicago/Turabian Style

Evangelos Tzamos; Micol Bussolesi; Giovanni Grieco; Pietro Marescotti; Laura Crispini; Andreas Kasinos; Niccolò Storni; Konstantinos Simeonidis; Anastasios Zouboulis. 2020. "Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece)." Minerals 10, no. 11: 934.

Journal article
Published: 31 August 2020 in Sustainability
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Chromite foundry sands, mixed with binding resins, are employed in the industry to form molds for high demanding casting of metals and steel. As there is no substitute, these sands highly contribute to placing chromium at the top value of the economic importance parameter in the EU classification of critical raw materials. Finding new sources to produce these sands can contribute to lowering their criticality. Chromite foundry sands must meet strict quality parameters, referred to as Cr2O3 content, Fineness Index, SiO2 content, and Acid Demand. The foundry chromite market is dominated by South Africa production deriving from layered intrusion chromite deposits. Chromite sands from ophiolite chromite deposits, normally used for the metallurgical-grade chromite market, were tested as an alternative starting raw material to produce chromite foundry sands. The study of the silicate impurities assemblage showed that its mineralogy strongly affects the result of the most crucial parameter, the Acid Demand. Ophiolite chromite with serpentine impurities should be depurated to a hardly affordable 0.31% SiO2 content to meet Acid Demand quality threshold, due to high reactivity of this silicate with acid environment of the test. Those with olivine impurities require to be depurated to a much more easily affordable 2.11% SiO2 content. As a result, ophiolite chromite with an olivine dominated silicate assemblage can be used as an alternative source of chromite foundry sands.

ACS Style

Micol Bussolesi; Giovanni Grieco; Alireza Eslami; Alessandro Cavallo. Ophiolite Chromite Deposits As a New Source for the Production of Refractory Chromite Sands. Sustainability 2020, 12, 7096 .

AMA Style

Micol Bussolesi, Giovanni Grieco, Alireza Eslami, Alessandro Cavallo. Ophiolite Chromite Deposits As a New Source for the Production of Refractory Chromite Sands. Sustainability. 2020; 12 (17):7096.

Chicago/Turabian Style

Micol Bussolesi; Giovanni Grieco; Alireza Eslami; Alessandro Cavallo. 2020. "Ophiolite Chromite Deposits As a New Source for the Production of Refractory Chromite Sands." Sustainability 12, no. 17: 7096.

Journal article
Published: 24 July 2020 in Ore Geology Reviews
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The understanding of ophiolites as hosts to economic–scale chromitite ore deposits requires the integration of research relating their geochemical metallogenesis with studies of the mode and nature of their lithospheric-scale deformation. The Neotethyan Vourinos ophiolite in Northern Greece represents a well-preserved ophiolite complete with sheeted dikes, an in-situ Moho transition zone, and a nearly 8-km-thick upper mantle sequence. Chromitite bodies and sub-economic chrome ores occur throughout its ultramafic section, and above and below the petrological Moho; but, economic concentrations of chromitite are restricted to a region referred to as the “metalliferous zone” within the upper mantle domain. Ductile deformation, which developed synchronously with mineral re-equilibration and late magmatic activity, re-concentrated chromite grains in mesoscopic fold noses and created massive-textured ore bodies. Re-equilibration of chromite and chromite–olivine grains on microscopic–scale during this ductile deformation produced geochemical patterns that are compatible with strain distribution. Whether re-equilibration varied with strain rate in the mantle lithosphere due to regional heterogeneous conditions, or whether the change in deformation–induced modal distribution of the mineral aggregate more strongly affected the process of re-equilibration is yet to be determined. The richest ore bodies in Vourinos are represented by the schlieren ores of the Xerolivado Mine, and occur as extensive lenses of mylonitic chromitite, marking the highest degree of deformation within the complex. These textures display patterns of re-equilibration geochemical halos and transition from ductile into brittle deformation conditions.

ACS Style

A. Rassios; E. Tzamos; Y. Dilek; M. Bussolesi; G. Grieco; A. Batsi; P.N. Gamaletsos. A structural approach to the genesis of chrome ores within the Vourinos ophiolite (Greece): Significance of ductile and brittle deformation processes in the formation of economic ore bodies in oceanic upper mantle peridotites. Ore Geology Reviews 2020, 125, 103684 .

AMA Style

A. Rassios, E. Tzamos, Y. Dilek, M. Bussolesi, G. Grieco, A. Batsi, P.N. Gamaletsos. A structural approach to the genesis of chrome ores within the Vourinos ophiolite (Greece): Significance of ductile and brittle deformation processes in the formation of economic ore bodies in oceanic upper mantle peridotites. Ore Geology Reviews. 2020; 125 ():103684.

Chicago/Turabian Style

A. Rassios; E. Tzamos; Y. Dilek; M. Bussolesi; G. Grieco; A. Batsi; P.N. Gamaletsos. 2020. "A structural approach to the genesis of chrome ores within the Vourinos ophiolite (Greece): Significance of ductile and brittle deformation processes in the formation of economic ore bodies in oceanic upper mantle peridotites." Ore Geology Reviews 125, no. : 103684.

Journal article
Published: 11 May 2020 in Science of The Total Environment
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The qualitative and quantitative characterization of several mining by-product samples, were collected from the magnesite mine of “Grecian Magnesite SA” company (Gerakini, Chalkidiki, North Greece), was aiming to evaluate the possibility of upgrading their refractory properties by applying thermal treatment. The concentration range of main components for the selected best qualified samples was 38.7–43 wt% for MgO, 37.5–44.1 wt% for SiO2 and 6.5–7.3 wt% for FeO. The mineralogical characterization revealed the presence of olivine, pyroxenes and serpentine, with the concentration of the latter positively correlated to LOI. Microprobe analyses clarified the presence of olivine [(Mg1.79Fe0.19Ni0.01)SiO4], consisting mainly of 90 wt% of forsterite (Mg2SiO4) and 10 wt% of fayalite (Fe2SiO4), as well as of pyroxene group minerals [(Mg0.87Fe0.08Ca0.01Cr0.01)(Si0.98Al0.04)O3], consisting mainly of 91 wt% enstatite (MgSiO3) and 9 wt% of ferrosilite (FeSiO3), respectively. The thermal treatment of the qualified samples demonstrated that at the temperature of 650–680 °C serpentine is almost totally decomposed and at the temperature of 850 °C it has been totally recrystallized to olivine and pyroxenes. At higher temperature treatment (1300 °C), it seems that there is a recrystallization process that favors the deformation of olivine and the further formation of pyroxenes, due to the excess of Si available from the initial decomposition of serpentine, while the presence of magnesite resulted to the restriction of olivine deformation through the partial capture of available Si. For increasing the olivine percentage and, subsequently, the improvement of refractory properties of this material, at temperature > 1300°C, the ideal theoretical addition dose of wt% MgO for optimizing the formation of olivine was calculated, ranging from 7.4 to 17.5 wt%. The latter calculations are reported for the first time in the literature regarding this kind of materials.

ACS Style

Ε. Pagona; E. Tzamos; G. Grieco; A. Zouboulis; M. Mitrakas. Characterization and evaluation of magnesite ore mining by-products of Gerakini mines (Chalkidiki, N. Greece). Science of The Total Environment 2020, 732, 139279 .

AMA Style

Ε. Pagona, E. Tzamos, G. Grieco, A. Zouboulis, M. Mitrakas. Characterization and evaluation of magnesite ore mining by-products of Gerakini mines (Chalkidiki, N. Greece). Science of The Total Environment. 2020; 732 ():139279.

Chicago/Turabian Style

Ε. Pagona; E. Tzamos; G. Grieco; A. Zouboulis; M. Mitrakas. 2020. "Characterization and evaluation of magnesite ore mining by-products of Gerakini mines (Chalkidiki, N. Greece)." Science of The Total Environment 732, no. : 139279.

Journal article
Published: 10 April 2020 in Lithos
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The Abdasht and Soghan ultramafic complexes, Southern Iran, host major actively exploited chromitite bodies, variably enriched in PGE. The Platinum Group Minerals (PGM) – Base Metal Minerals (BMM) assemblage was studied in order to assess PGE remobilization during post-magmatic processes. Studied chromitites have variable textures: massive, banded, nodular and disseminated. Primary silicates are almost completely replaced by serpentine. Ferrian chromitization is present but not widespread. BMM are mostly found in the silicate matrix, while PGM are more common as inclusions within chromites. Primary BMM (pentlandite and bornite) within the silicate matrix are poorly preserved, while primary PGM (laurite) are more abundant. Secondary BMM (heazlewoodite, millerite and NiFe alloys) and PGM (PGE-alloys) are the dominant mineralogical species. During serpentinization the pervasive percolation of low fS2 fluids induced the desulfurization of the metallic assemblage. Primary sulfides were replaced by S-poor (heazlewoodite) or S-free (NiFe alloys, PGE alloys, PGE-BM alloys) phases. Low fS2 differentially mobilized PGE. The release of IPGE (Ir, Os, Ru) into the fluids follows the order: Ru> > Os>Ir. PPGE (Pt, Pd, Rh) mobility is more difficult to assess, due to their small concentration, but the evidence suggests that Rh is more mobile than Ru, and that Pd and Pt were partially added to the system by fluids. A mass balance calculation on a polyphasic grain, showing differential stages of desulfurization, allowed a semi-quantitative analysis on the desulfurization degree of Abdasht and Soghan complexes, estimated, in the more serpentinized portions, between 75 and 100%.

ACS Style

Giovanni Grieco; Micol Bussolesi; Alireza Eslami; Andrea Gentile; Alessandro Cavallo; Dongyang Lian; Jingsui Yang; Farhad Ghaseminejad. Differential platinum group elements (PGE) re-mobilization at low fS2 in Abdasht and Soghan mafic-ultramafic complexes (Southern Iran). Lithos 2020, 366-367, 105523 .

AMA Style

Giovanni Grieco, Micol Bussolesi, Alireza Eslami, Andrea Gentile, Alessandro Cavallo, Dongyang Lian, Jingsui Yang, Farhad Ghaseminejad. Differential platinum group elements (PGE) re-mobilization at low fS2 in Abdasht and Soghan mafic-ultramafic complexes (Southern Iran). Lithos. 2020; 366-367 ():105523.

Chicago/Turabian Style

Giovanni Grieco; Micol Bussolesi; Alireza Eslami; Andrea Gentile; Alessandro Cavallo; Dongyang Lian; Jingsui Yang; Farhad Ghaseminejad. 2020. "Differential platinum group elements (PGE) re-mobilization at low fS2 in Abdasht and Soghan mafic-ultramafic complexes (Southern Iran)." Lithos 366-367, no. : 105523.

Journal article
Published: 06 March 2020 in Minerals
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Antimony is a common metalloid occurring in the form of Sb-sulfides and sulfosalts, in various base and noble metal deposits. It is also present in corresponding metallurgical products (concentrates) and, although antimony has been considered a penalty element in the past, recently it has gained interest due to its classification as a critical raw material (CRM) by the European Union (EU). In the frame of the present paper, representative ore samples from the main Sb-bearing deposits of Greece (Kilkis prefecture, Chalkidiki prefecture (Kassandra Mines), and Chios Isl.) have been investigated. According to optical microscopy and electron probe microanalysis (EPMA) data, the Greek ores contain stibnite (Sb2S3), boulangerite (Pb5Sb4S11), bournonite (PbCuSbS3), bertherite (FeSbS4), and valentinite (Sb2O3). Bulk analyses by inductively coupled plasma mass spectrometry (ICP-MS) confirmed, for the first time published, the presence of a significant Hg content in the Kilkis Sb-ore. Furthermore, Kassandra Mines ores are found to contain remarkable amounts of Bi, As, Sn, Tl, and Se (excluding Ag, which is a bonus element). The above findings could contribute to potential future exploration and exploitation of Sb ores in Greece.

ACS Style

Evangelos Tzamos; Platon N. Gamaletsos; Giovanni Grieco; Micol Bussolesi; Anthimos Xenidis; Anastasios Zouboulis; Dimitrios Dimitriadis; Yiannis Pontikes; Athanasios Godelitsas. New Insights into the Mineralogy and Geochemistry of Sb Ores from Greece. Minerals 2020, 10, 236 .

AMA Style

Evangelos Tzamos, Platon N. Gamaletsos, Giovanni Grieco, Micol Bussolesi, Anthimos Xenidis, Anastasios Zouboulis, Dimitrios Dimitriadis, Yiannis Pontikes, Athanasios Godelitsas. New Insights into the Mineralogy and Geochemistry of Sb Ores from Greece. Minerals. 2020; 10 (3):236.

Chicago/Turabian Style

Evangelos Tzamos; Platon N. Gamaletsos; Giovanni Grieco; Micol Bussolesi; Anthimos Xenidis; Anastasios Zouboulis; Dimitrios Dimitriadis; Yiannis Pontikes; Athanasios Godelitsas. 2020. "New Insights into the Mineralogy and Geochemistry of Sb Ores from Greece." Minerals 10, no. 3: 236.

Journal article
Published: 13 February 2020 in Minerals
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Holes BA1B and BA3A were drilled into the Wadi Tayin Massif, southern ophiolite complex of Oman, a fragment of the Tethyan oceanic lithosphere obducted onto the Arabian continent. Within the sequence, we have studied a portion of the shallow mantle, composed mainly of strongly serpentinised harzburgite that embeds dunitic levels, the biggest being over 150 m thick. The formation of thick dunitic channels, already approached via published structural and mathematical models, is here investigated with a mineral chemistry approach. We focused on Cr-spinel, the only widespread phase preserved during serpentinization, whose TiO2 content displays a wide variability from low in harzburgite, (TiO2 < 0.25 wt. %), typical of non-metasomatised ophiolite mantle, to moderately high in dunite (TiO2 < 1.10 wt. %) characterizing a rock/melt interactions. The high variability of TiO2, accompanied by similar patterns of Cr# and Mg# is observed, in a fractal pattern, at all scales of investigation, from the whole channel scale to the single thin section, where it affects even single grain zonings. Our results suggest that the over 150 m thick dunite channel here investigated was formed by coalescence of different scale melt channels and reaction zones with different sizes, confirming the published structural model.

ACS Style

Giuseppe Cocomazzi; Giovanni Grieco; Paola Tartarotti; Micol Bussolesi; Federica Zaccarini; Laura Crispini; Oman Drilling Project Science Team. The Formation of Dunite Channels within Harzburgite in the Wadi Tayin Massif, Oman Ophiolite: Insights from Compositional Variability of Cr-Spinel and Olivine in Holes BA1B and BA3A, Oman Drilling Project. Minerals 2020, 10, 167 .

AMA Style

Giuseppe Cocomazzi, Giovanni Grieco, Paola Tartarotti, Micol Bussolesi, Federica Zaccarini, Laura Crispini, Oman Drilling Project Science Team. The Formation of Dunite Channels within Harzburgite in the Wadi Tayin Massif, Oman Ophiolite: Insights from Compositional Variability of Cr-Spinel and Olivine in Holes BA1B and BA3A, Oman Drilling Project. Minerals. 2020; 10 (2):167.

Chicago/Turabian Style

Giuseppe Cocomazzi; Giovanni Grieco; Paola Tartarotti; Micol Bussolesi; Federica Zaccarini; Laura Crispini; Oman Drilling Project Science Team. 2020. "The Formation of Dunite Channels within Harzburgite in the Wadi Tayin Massif, Oman Ophiolite: Insights from Compositional Variability of Cr-Spinel and Olivine in Holes BA1B and BA3A, Oman Drilling Project." Minerals 10, no. 2: 167.

Journal article
Published: 30 January 2020 in Minerals
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The Nizhne-Derbinsk mafic-ultramafic complex is located between the Central Asian Orogenic Belt and the Siberian Craton and, is associated with the Ballyk fault. The largest, spatially related to each other, plutons in the central part of the complex are the Burlakski and Nizhne-Derbinsk. Rocks in the main units of these plutons are divided into three groups: peridotites (ultramafic), pyroxenites (sub-ultramafic), and gabbroic rocks (mafic). The ultramafic and sub-ultramafic cumulate series are devoid of plagioclase and contain

ACS Style

Tamara Yakich; Matthew Brzozowski; Alexey Chernishov; Giovanni Grieco; Olesya Savinova; Timofey Timkin; Alexander Marfin. Petrological Features of the Burlakski and Nizhne-Derbinsk Mafic-Ultramafic Plutons (East Sayan Mountains, Siberia, Russia). Minerals 2020, 10, 119 .

AMA Style

Tamara Yakich, Matthew Brzozowski, Alexey Chernishov, Giovanni Grieco, Olesya Savinova, Timofey Timkin, Alexander Marfin. Petrological Features of the Burlakski and Nizhne-Derbinsk Mafic-Ultramafic Plutons (East Sayan Mountains, Siberia, Russia). Minerals. 2020; 10 (2):119.

Chicago/Turabian Style

Tamara Yakich; Matthew Brzozowski; Alexey Chernishov; Giovanni Grieco; Olesya Savinova; Timofey Timkin; Alexander Marfin. 2020. "Petrological Features of the Burlakski and Nizhne-Derbinsk Mafic-Ultramafic Plutons (East Sayan Mountains, Siberia, Russia)." Minerals 10, no. 2: 119.

Journal article
Published: 09 April 2019 in Geosciences
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Pyrite/arsenopyrite (Py-AsPy), galena (PbS), and sphalerite (ZnS) concentrates from the flotation plants of Olympias and Stratoni (Kassandra mines, Chalkidiki, N. Greece) were investigated for their major, trace, minor, and critical element contents, including actinides associated to natural radioactivity. It is revealed that in addition to the Pb, Zn, Ag, and Au being exploited by Hellas Gold S.A., there are also significant concentrations of Sb and Ga (Sb: >0.2 wt.% in PbS concentrate; Ga:25 ppm in ZnS concentrate), but no considerable contents of Bi, Co, V, or REE. Concerning other elements, As was found in elevated concentrations (>1 wt.% in Py-(As)Py-AsPy Olympias concentrate and almost 1 wt.% in Stratoni PbS and ZnS concentrates) together with Cd (specifically in ZnS concentrate). However, actinides occurred in very low concentrations (U < 2 ppm and Th < 0.5 ppm in all examined concentrates), limiting the possibility of natural radioactivity in the Hellas Gold S.A. products. The concentrations of the natural radionuclides (238U, 232Th, and 40K) are much lower than those of commercial granitic rocks, and thus the associated radioactive dose is insignificant.

ACS Style

Evangelos Tzamos; Argyrios Papadopoulos; Giovanni Grieco; Stylianos Stoulos; Micol Bussolesi; Emmanouil Daftsis; Eleftheria Vagli; Dimitrios Dimitriadis; Athanasios Godelitsas. Investigation of Trace and Critical Elements (Including Actinides) in Flotation Sulphide Concentrates of Kassandra Mines (Chalkidiki, Greece). Geosciences 2019, 9, 164 .

AMA Style

Evangelos Tzamos, Argyrios Papadopoulos, Giovanni Grieco, Stylianos Stoulos, Micol Bussolesi, Emmanouil Daftsis, Eleftheria Vagli, Dimitrios Dimitriadis, Athanasios Godelitsas. Investigation of Trace and Critical Elements (Including Actinides) in Flotation Sulphide Concentrates of Kassandra Mines (Chalkidiki, Greece). Geosciences. 2019; 9 (4):164.

Chicago/Turabian Style

Evangelos Tzamos; Argyrios Papadopoulos; Giovanni Grieco; Stylianos Stoulos; Micol Bussolesi; Emmanouil Daftsis; Eleftheria Vagli; Dimitrios Dimitriadis; Athanasios Godelitsas. 2019. "Investigation of Trace and Critical Elements (Including Actinides) in Flotation Sulphide Concentrates of Kassandra Mines (Chalkidiki, Greece)." Geosciences 9, no. 4: 164.

Journal article
Published: 27 January 2019 in Minerals
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The study of Mg–Fe2+ subsolidus exchange between olivine and spinel is a powerful tool to unravel the thermal history of ultramafic rocks. We have implemented such a study using olivine–spinel diffusivity patterns in fresh mineralogical samples from the Finero mafic-ultramafic Complex in the Ivrea-Verbano zone of Northern Italy. Our analytical suite includes chromitites and dunites of the Phlogopite-Peridotite Unit from the core of the Complex. Primary and re-equilibrated olivine and spinel compositions were derived from diffusivity curves calculated by fitting data via an exponential function. Resulting XMg (Mg/(Mg + Fe2+) values were then used for geothermometry. Samples are found to demonstrate a maximum temperature of 849 °C and a minimum temperature of 656 °C; these temperatures coincide with the limits of elemental exchange in this mineralogic system. We were unable to identify primary olivine/spinel compositions related to the original formation of the dunite–chromitite suite during Early Permian metasomatic activity. Temperature of 849 °C is ascribed to the Late Triassic re-heating event dated at 208 ± 2 Ma. Continuous cooling followed this event at rates of 10−4 and 10−2 °C/yr until cessation of elemental exchange activity at ~656 °C. A rapid cooling rate is associated with the uplift and subsequent decrease of geothermal gradient during the early stages of the opening of the Piemont ocean basin.

ACS Style

Micol Bussolesi; Giovanni Grieco; Evangelos Tzamos. Olivine–Spinel Diffusivity Patterns in Chromitites and Dunites from the Finero Phlogopite-Peridotite (Ivrea-Verbano Zone, Southern Alps): Implications for the Thermal History of the Massif. Minerals 2019, 9, 75 .

AMA Style

Micol Bussolesi, Giovanni Grieco, Evangelos Tzamos. Olivine–Spinel Diffusivity Patterns in Chromitites and Dunites from the Finero Phlogopite-Peridotite (Ivrea-Verbano Zone, Southern Alps): Implications for the Thermal History of the Massif. Minerals. 2019; 9 (2):75.

Chicago/Turabian Style

Micol Bussolesi; Giovanni Grieco; Evangelos Tzamos. 2019. "Olivine–Spinel Diffusivity Patterns in Chromitites and Dunites from the Finero Phlogopite-Peridotite (Ivrea-Verbano Zone, Southern Alps): Implications for the Thermal History of the Massif." Minerals 9, no. 2: 75.

Journal article
Published: 01 January 2019 in Journal of Big History
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ACS Style

Adalberto Codetta Raiteri; Marina Porta; Giovanni Grieco; Renza Cambini. Towards a Big History Model for Italian Schools. Journal of Big History 2019, 3, 33 -49.

AMA Style

Adalberto Codetta Raiteri, Marina Porta, Giovanni Grieco, Renza Cambini. Towards a Big History Model for Italian Schools. Journal of Big History. 2019; 3 (1):33-49.

Chicago/Turabian Style

Adalberto Codetta Raiteri; Marina Porta; Giovanni Grieco; Renza Cambini. 2019. "Towards a Big History Model for Italian Schools." Journal of Big History 3, no. 1: 33-49.

Journal article
Published: 01 July 2018 in Rendiconti Online della Società Geologica Italiana
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Natural Science education in the secondary school follows a recurring logic: preliminary knowledges are enriched with new ones and with new perspectives. Mineralogy and geology are the key-subjects to understand how to utilize “geo-resources” or “geomaterials” for human needs, projecting the human history into that of cosmos. The Big History model allows observing specific topics in a whole, along a geologic time scale. In this paper, the results of the Big History project, experimented in Val D’Ossola (Northeastern Piedmont) are presented. The project has been developed during the last two school years in a Scientific Lyceum. In the investigated area, geologic history spans for several hundred of millions years, from the Hercynian basement outcrops to the current exploitation of local stone, eotouristic development and geoeducational approaches linked to sport activities. The project output of the second year was a geotouristic application for Android, which allowed exploring the area on different temporal and spatial scales according to the Big History perspective.

ACS Style

Marina Porta; Giovanni Grieco; Adalberto Codetta Raiteri; Giacomo Diego Gatta; Marco Merlini. From nature to human needs: availability and use of geo-materials in Earth Sciences; an educational approach through the Big History project. Rendiconti Online della Società Geologica Italiana 2018, 45, 49 -53.

AMA Style

Marina Porta, Giovanni Grieco, Adalberto Codetta Raiteri, Giacomo Diego Gatta, Marco Merlini. From nature to human needs: availability and use of geo-materials in Earth Sciences; an educational approach through the Big History project. Rendiconti Online della Società Geologica Italiana. 2018; 45 ():49-53.

Chicago/Turabian Style

Marina Porta; Giovanni Grieco; Adalberto Codetta Raiteri; Giacomo Diego Gatta; Marco Merlini. 2018. "From nature to human needs: availability and use of geo-materials in Earth Sciences; an educational approach through the Big History project." Rendiconti Online della Società Geologica Italiana 45, no. : 49-53.

Journal article
Published: 01 April 2018 in Ore Geology Reviews
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The Vourinos ophiolite is a complete ophiolite sequence covering an area of ∼450 km2, that hosts the largest chromite mining district in Europe. Chrome ore deposits range in size from several millions of tonnes of Xerolivado-Skoumtsa mine to some thousand tonnes of the smallest exploited ores. Widespread mining activity closed in the 1990s, leaving behind good exposures of chromitite bodies within the closed mines. Samples from 10 of these mines, 4 located in the Northern part of the massif and 6 located in its Southern part, were collected in order to study the spatial variability of chromite and olivine mineral chemistry in these ores at different scales, and to infer the roles of primary magmatic and secondary post-magmatic re-equilibration processes. Chromites from chromitites show higher XCr (0.75-0.87) than scattered spinels in peridotites and serpentinites (0.45-0.70) and largely variable XMg (0.40-0.78). Chromite compositions of North and South Vourinos ores largely overlap, while they show differences at the scale of single deposits, with a remarkable higher XMg at Xerolivado-Skoumtsa. High variability internal to each deposit is due to different re-equilibration conditions at variable olivine/spinel volume ratios. Olivine and chromite XMg values are positively correlated to chromite modal content, while XCr of chromite is not significantly affected by re-equilibration. Calculated re-equilibration temperatures are higher for the larger Xerolivado-Skoumtsa deposit (777-837 °C) than for the other smaller ones (715-746 °C). The inferred magmatic temperature is 1243 °C for Xerolivado-Skoumtsa and 982 °C for the other chromite deposits. Calculated melt compositions are very consistent for the 10 studied mines that all show a boninitic affinity. The whole set of data shows that Vourinos chromitites were formed in an island arc environment from a heterogeneous mantle source that underwent different degrees of melting. Subsolidus re-equilibration occurred during cooling at temperatures as low as 700 °C, partially obliterating primary magmatic features.

ACS Style

Giovanni Grieco; Micol Bussolesi; Evangelos Tzamos; Annie Ewing Rassios; Argyrios Kapsiotis. Processes of primary and re-equilibration mineralization affecting chromitite ore geochemistry within the Vourinos ultramafic sequence, Vourinos ophiolite (West Macedonia, Greece). Ore Geology Reviews 2018, 95, 537 -551.

AMA Style

Giovanni Grieco, Micol Bussolesi, Evangelos Tzamos, Annie Ewing Rassios, Argyrios Kapsiotis. Processes of primary and re-equilibration mineralization affecting chromitite ore geochemistry within the Vourinos ultramafic sequence, Vourinos ophiolite (West Macedonia, Greece). Ore Geology Reviews. 2018; 95 ():537-551.

Chicago/Turabian Style

Giovanni Grieco; Micol Bussolesi; Evangelos Tzamos; Annie Ewing Rassios; Argyrios Kapsiotis. 2018. "Processes of primary and re-equilibration mineralization affecting chromitite ore geochemistry within the Vourinos ultramafic sequence, Vourinos ophiolite (West Macedonia, Greece)." Ore Geology Reviews 95, no. : 537-551.

Journal article
Published: 01 February 2018 in Journal of Geochemical Exploration
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Argyrios Kapsiotis; Anne Ewing Rassios; Ibrahim Uysal; Giovanni Grieco; Recep Melih Akmaz; Samet Saka; Micol Bussolesi. Compositional fingerprints of chromian spinel from the refractory chrome ores of Metalleion, Othris (Greece): Implications for metallogeny and deformation of chromitites within a “hot” oceanic fault zone. Journal of Geochemical Exploration 2018, 185, 14 -32.

AMA Style

Argyrios Kapsiotis, Anne Ewing Rassios, Ibrahim Uysal, Giovanni Grieco, Recep Melih Akmaz, Samet Saka, Micol Bussolesi. Compositional fingerprints of chromian spinel from the refractory chrome ores of Metalleion, Othris (Greece): Implications for metallogeny and deformation of chromitites within a “hot” oceanic fault zone. Journal of Geochemical Exploration. 2018; 185 ():14-32.

Chicago/Turabian Style

Argyrios Kapsiotis; Anne Ewing Rassios; Ibrahim Uysal; Giovanni Grieco; Recep Melih Akmaz; Samet Saka; Micol Bussolesi. 2018. "Compositional fingerprints of chromian spinel from the refractory chrome ores of Metalleion, Othris (Greece): Implications for metallogeny and deformation of chromitites within a “hot” oceanic fault zone." Journal of Geochemical Exploration 185, no. : 14-32.

Original article
Published: 16 November 2017 in Environmental Earth Sciences
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Sulfide-rich tailings are a well-known environmental threat due to their production of acid drainage (AD) and release of potential toxic elements (PTE) to the local environment. The presence of heterogeneous materials produces complex environmental signatures and complicates the quantitative prediction of contamination. The present work provides a method of quantifying such heterogeneities, starting from mineral processing data of the Reps, Mirdita (Albania) site. A quantitative flow sheet (QF) method was applied to a selected dump site of the Mirdita copper mining district where secondary pyrite separation had been used in the past. The site is subject to long-lasting (103 years) AD processes with significant release of PTE into the local environment. The tailings at the Reps site are divided into two classes based on the sulfide S content, respectively, represented by high-sulfide-content (S > 10 wt%) materials (hS) and low-sulfide-content (S < 3 wt%) material (lS). The reconstruction of the QF allowed us to identify the hS tailings as the discharge of single-flotation processing lines. This material accounts for about 82% of the total potential H2SO4 production, even though it represents < 20% of the entire tailing discard. The QF is a useful tool for the evaluation of heterogeneity and consequently for the modeling of waste management within abandoned sites and in working plants. Given a good quantification, heterogeneity can in fact support the setting of pyrite separation lines or the separate management of pyrite-rich tailing dumps.

ACS Style

Irene Fantone; Giovanni Grieco; Agim Sinojmeri; Alessandro Cavallo. A quantitative approach to the influence of pyrite separation on Cu-processing tailings: a case study at Reps, Mirdita district, Albania. Environmental Earth Sciences 2017, 76, 774 .

AMA Style

Irene Fantone, Giovanni Grieco, Agim Sinojmeri, Alessandro Cavallo. A quantitative approach to the influence of pyrite separation on Cu-processing tailings: a case study at Reps, Mirdita district, Albania. Environmental Earth Sciences. 2017; 76 (22):774.

Chicago/Turabian Style

Irene Fantone; Giovanni Grieco; Agim Sinojmeri; Alessandro Cavallo. 2017. "A quantitative approach to the influence of pyrite separation on Cu-processing tailings: a case study at Reps, Mirdita district, Albania." Environmental Earth Sciences 76, no. 22: 774.

Journal article
Published: 01 November 2017 in Ore Geology Reviews
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Argyrios Kapsiotis; Anne Ewing Rassios; Giovanni Grieco; Aspasia Antonelou. Genesis of Cr-bearing hydrogrossular-rich veins in a chromitite boulder from Ayios Stefanos, West Othris, Greece: A paradigm of micro-rodingites formation at the late stages of oceanic slab emplacement. Ore Geology Reviews 2017, 90, 287 -306.

AMA Style

Argyrios Kapsiotis, Anne Ewing Rassios, Giovanni Grieco, Aspasia Antonelou. Genesis of Cr-bearing hydrogrossular-rich veins in a chromitite boulder from Ayios Stefanos, West Othris, Greece: A paradigm of micro-rodingites formation at the late stages of oceanic slab emplacement. Ore Geology Reviews. 2017; 90 ():287-306.

Chicago/Turabian Style

Argyrios Kapsiotis; Anne Ewing Rassios; Giovanni Grieco; Aspasia Antonelou. 2017. "Genesis of Cr-bearing hydrogrossular-rich veins in a chromitite boulder from Ayios Stefanos, West Othris, Greece: A paradigm of micro-rodingites formation at the late stages of oceanic slab emplacement." Ore Geology Reviews 90, no. : 287-306.

Journal article
Published: 31 July 2017 in Bulletin of the Geological Society of Greece
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Zeolitic rock samples from South Xerovouni contain on average, 57 wt.% HEU type zeolite, 6 wt.% clay minerals, 3 wt.% mica (total of 66 wt.% microporous minerals), 19 wt.% feldspars, 10 wt.% cristobalite and 5 wt.% quartz (total of 34 wt.% non-microporous minerals). Chemically the zeolitic rock consists mainly of 69.9 wt.% SiO2, 13.2 wt.% Al2O3, 1.2 wt.% Fe2O3t, 1.0 wt.% MgO, 3.0 wt.% CaO, 1.5 wt.% Na2O and 2.2 wt.% K2O. The zeolitic rock shows an average ammonia ion exchange capacity of 150 meq/100g. HEU-type zeolite accounts for the most of the uptake ability, while clay minerals and mica contribute to a relative small extent only. The uptake ability of the five zeolitic rock samples showed positive correlations with the content of HEU-type zeolite as well as with the total content of microporous minerals (zeolite + mica + clay minerals). Such materials could be used in a wide range and scale of agricultural, aquacultural, and environmental applications.

ACS Style

E. Tzamos; A. Filippidis; N. Kantiranis; C. Sikalidis; A. Tsirambidis; G. Papastergios; D. Vogiatzis. UPTAKE ABILITY OF ZEOLITIC ROCK FROM SOUTH XEROVOUNI, AVDELLA, EVROS, HELLAS. Bulletin of the Geological Society of Greece 2017, 43, 2762 -2772.

AMA Style

E. Tzamos, A. Filippidis, N. Kantiranis, C. Sikalidis, A. Tsirambidis, G. Papastergios, D. Vogiatzis. UPTAKE ABILITY OF ZEOLITIC ROCK FROM SOUTH XEROVOUNI, AVDELLA, EVROS, HELLAS. Bulletin of the Geological Society of Greece. 2017; 43 (5):2762-2772.

Chicago/Turabian Style

E. Tzamos; A. Filippidis; N. Kantiranis; C. Sikalidis; A. Tsirambidis; G. Papastergios; D. Vogiatzis. 2017. "UPTAKE ABILITY OF ZEOLITIC ROCK FROM SOUTH XEROVOUNI, AVDELLA, EVROS, HELLAS." Bulletin of the Geological Society of Greece 43, no. 5: 2762-2772.

Journal article
Published: 28 July 2017 in Bulletin of the Geological Society of Greece
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The Serpentinite between the chromite bodies 4 and 5 of Xerolivado mine (Vourinos, Greece), contains sparsely very small grains (

ACS Style

E. Tzamos; A. Filippidis; K. Michailidis; A. Koroneos; A. Rassios; G. Grieco; M. Pedrotti; K. Stamoulis. MINERAL CHEMISTRY AND FORMATION OF AWARUITE AND HEAZLEWOODITE IN THE XEROLIVADO CHROME MINE, VOURINOS, GREECE. Bulletin of the Geological Society of Greece 2017, 50, 2047 -2056.

AMA Style

E. Tzamos, A. Filippidis, K. Michailidis, A. Koroneos, A. Rassios, G. Grieco, M. Pedrotti, K. Stamoulis. MINERAL CHEMISTRY AND FORMATION OF AWARUITE AND HEAZLEWOODITE IN THE XEROLIVADO CHROME MINE, VOURINOS, GREECE. Bulletin of the Geological Society of Greece. 2017; 50 (4):2047-2056.

Chicago/Turabian Style

E. Tzamos; A. Filippidis; K. Michailidis; A. Koroneos; A. Rassios; G. Grieco; M. Pedrotti; K. Stamoulis. 2017. "MINERAL CHEMISTRY AND FORMATION OF AWARUITE AND HEAZLEWOODITE IN THE XEROLIVADO CHROME MINE, VOURINOS, GREECE." Bulletin of the Geological Society of Greece 50, no. 4: 2047-2056.

Journal article
Published: 28 July 2017 in Bulletin of the Geological Society of Greece
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A HEU-type zeolitic tuff of very-high quality (88 wt.% clinoptilolite-heulandite) has been used as an additive to natural soils, aiming to reduce the produced nitrate load in leachates, following a common irrigation scheme. Zeolitic tuff has been added and mixed with agricultural soil in three different proportions (0.2, 0.4 and 0.6%) corresponding to an application of 500, 1000 and 1500 kg per acre. The control soil (without zeolitic tuff) and the three mixtures were exposed in a ten weeks experiment, in which, specific doses of irrigation water enriched in nitrates were added. Results of leachates analyses revealed that the addition of 0.2% zeolitic tuff is not effective and the mixture of soil-zeolitic tuff appears to have similar behaviour with the untreated (reference) soil sample. On the contrary, zeolitic tuff additions by 0.4% and 0.6% showed remarkable results and reduced the nitrate load of leachates by 81 and 86%, respectively. Hence, the impacts from the application of very-high quality HEUtype zeolitic tuff in agricultural soils could be rather positive towards environmental protection and rational farming, an in line with the goals and objectives of the new common agricultural policy imposed by European Union

ACS Style

E. Hatzigiannakis; N. Kantiranis; E. Tziritis; A. Filippidis; G. Arampatzis; E. Tzamos. THE USE OF HEU-TYPE ZEOLITIC TUFF IN SUSTAINABLE AGRICULTURE: EXPERIMENTAL STUDY ON THE DECREASE OF NITRATE LOAD IN VADOSE ZONE LEACHATES. Bulletin of the Geological Society of Greece 2017, 50, 2145 -2154.

AMA Style

E. Hatzigiannakis, N. Kantiranis, E. Tziritis, A. Filippidis, G. Arampatzis, E. Tzamos. THE USE OF HEU-TYPE ZEOLITIC TUFF IN SUSTAINABLE AGRICULTURE: EXPERIMENTAL STUDY ON THE DECREASE OF NITRATE LOAD IN VADOSE ZONE LEACHATES. Bulletin of the Geological Society of Greece. 2017; 50 (4):2145-2154.

Chicago/Turabian Style

E. Hatzigiannakis; N. Kantiranis; E. Tziritis; A. Filippidis; G. Arampatzis; E. Tzamos. 2017. "THE USE OF HEU-TYPE ZEOLITIC TUFF IN SUSTAINABLE AGRICULTURE: EXPERIMENTAL STUDY ON THE DECREASE OF NITRATE LOAD IN VADOSE ZONE LEACHATES." Bulletin of the Geological Society of Greece 50, no. 4: 2145-2154.