This page has only limited features, please log in for full access.
The occurrence of phlogopite and amphibole in mantle ultramafic rocks is widely accepted as the modal effect of metasomatism in the upper mantle. However, their simultaneous formation during metasomatic events and the related sub-solidus equilibrium with the peridotite has not been extensively studied. In this work, we discuss the geochemical conditions at which the pargasite-phlogopite assemblage becomes stable, through the investigation of two mantle xenoliths from Mount Leura (Victoria State, Australia) that bear phlogopite and the phlogopite + amphibole (pargasite) pair disseminated in a harzburgite matrix. Combining a mineralogical study and thermodynamic modelling, we predict that the P–T locus of the equilibrium reaction pargasite + forsterite = Na-phlogopite + 2 diopside + spinel, over the range 1.3–3.0 GPa/540–1500 K, yields a negative Clapeyron slope of -0.003 GPa K–1 (on average). The intersection of the P–T locus of supposed equilibrium with the new mantle geotherm calculated in this work allowed us to state that the Mount Leura xenoliths achieved equilibrium at 2.3 GPa /1190 K, that represents a plausible depth of ~ 70 km. Metasomatic K-Na-OH rich fluids stabilize hydrous phases. This has been modelled by the following equilibrium equation: 2 (K,Na)-phlogopite + forsterite = 7/2 enstatite + spinel + fluid (components: Na2O,K2O,H2O). Using quantum-mechanics, semi-empirical potentials, lattice dynamics and observed thermo-elastic data, we concluded that K-Na-OH rich fluids are not effective metasomatic agents to convey alkali species across the upper mantle, as the fluids are highly reactive with the ultramafic system and favour the rapid formation of phlogopite and amphibole. In addition, oxygen fugacity estimates of the Mount Leura mantle xenoliths [Δ(FMQ) = –1.97 ± 0.35; –1.83 ± 0.36] indicate a more reducing mantle environment than what is expected from the occurrence of phlogopite and amphibole in spinel-bearing peridotites. This is accounted for by our model of full molecular dissociation of the fluid and incorporation of the O-H-K-Na species into (OH)-K-Na-bearing mineral phases (phlogopite and amphibole), that leads to a peridotite metasomatized ambient characterized by reduced oxygen fugacity.
Costanza Bonadiman; Valentina Brombin; Giovanni B. Andreozzi; Piera Benna; Massimo Coltorti; Nadia Curetti; Barbara Faccini; Marcello Merli; Beatrice Pelorosso; Vincenzo Stagno; Magdala Tesauro; Alessandro Pavese. Phlogopite-pargasite coexistence in an oxygen reduced spinel-peridotite ambient. Scientific Reports 2021, 11, 1 -17.
AMA StyleCostanza Bonadiman, Valentina Brombin, Giovanni B. Andreozzi, Piera Benna, Massimo Coltorti, Nadia Curetti, Barbara Faccini, Marcello Merli, Beatrice Pelorosso, Vincenzo Stagno, Magdala Tesauro, Alessandro Pavese. Phlogopite-pargasite coexistence in an oxygen reduced spinel-peridotite ambient. Scientific Reports. 2021; 11 (1):1-17.
Chicago/Turabian StyleCostanza Bonadiman; Valentina Brombin; Giovanni B. Andreozzi; Piera Benna; Massimo Coltorti; Nadia Curetti; Barbara Faccini; Marcello Merli; Beatrice Pelorosso; Vincenzo Stagno; Magdala Tesauro; Alessandro Pavese. 2021. "Phlogopite-pargasite coexistence in an oxygen reduced spinel-peridotite ambient." Scientific Reports 11, no. 1: 1-17.
In the Adriatic lagoons of northern Italy, manila clam (Ruditapes philippinarum) farming provides important socio-economic returns and local clams should be registered with the Protected Designations of Origin scheme. Therefore, there is a need for the development of rapid, cost-effective tests to guarantee the origin of the product and to prevent potential fraud. In this work, an elemental analysis (EA) coupled with isotope ratio mass spectrometry (IRMS) was employed to identify the isotopic fingerprints of clams directly collected onsite in three Adriatic lagoons and bought at a local supermarket, where they exhibited certification. In particular, a multivariate analysis of C/N, δ13C and δ15N in manila clam tissues as well as δ13C in shells and
Gianluca Bianchini; Valentina Brombin; Pasquale Carlino; Enrico Mistri; Claudio Natali; Gian Salani. Traceability and Authentication of Manila Clams from North-Western Adriatic Lagoons Using C and N Stable Isotope Analysis. Molecules 2021, 26, 1859 .
AMA StyleGianluca Bianchini, Valentina Brombin, Pasquale Carlino, Enrico Mistri, Claudio Natali, Gian Salani. Traceability and Authentication of Manila Clams from North-Western Adriatic Lagoons Using C and N Stable Isotope Analysis. Molecules. 2021; 26 (7):1859.
Chicago/Turabian StyleGianluca Bianchini; Valentina Brombin; Pasquale Carlino; Enrico Mistri; Claudio Natali; Gian Salani. 2021. "Traceability and Authentication of Manila Clams from North-Western Adriatic Lagoons Using C and N Stable Isotope Analysis." Molecules 26, no. 7: 1859.
Sustainable agricultural management is needed to promote carbon (C) sequestration in soil, prevent loss of soil fertility, and reduce the release of greenhouse gases. However, the influence of agronomic practices on soil C sequestration depends on the existing pedoclimatic features. We characterized the soils of three farms far away each other in the Emilia-Romagna region (Northern Italy): an organic farm in the Northern Apennines, a biodynamic farm, and a conventional farm on the Po Plain. The total, inorganic, and organic carbon in soil, as well as the distinct humic fractions were investigated, analyzing both the elemental and isotopic (13C/12C) composition. In soils, organic matter appears to be variously affected by mineralization processes induced by microorganisms that consume organic carbon. In particular, organic carbon declined in farms located in the plain (e.g., organic carbon down to 0.75 wt%; carbon stock0-30 cm down to 33 Mg/ha), because of the warmer climate and moderately alkaline environment that enhance soil microbial activity. On the other hand, at the mountain farm, the minimum soil disturbance, the cold climate, and the neutral conditions favored soil C sequestration (organic carbon up to 4.42 wt%; carbon stock0-30 cm up to 160 Mg/ha) in humified organic compounds with long turnover, which can limit greenhouse gas emissions into the atmosphere. This work shows the need for thorough soil investigations, to propose tailored best-practices that can reconcile productivity and soil sustainability.
Valentina Brombin; Enrico Mistri; Mauro De Feudis; Camilla Forti; Gian Salani; Claudio Natali; Gloria Falsone; Livia Vittori Antisari; Gianluca Bianchini. Soil Carbon Investigation in Three Pedoclimatic and Agronomic Settings of Northern Italy. Sustainability 2020, 12, 10539 .
AMA StyleValentina Brombin, Enrico Mistri, Mauro De Feudis, Camilla Forti, Gian Salani, Claudio Natali, Gloria Falsone, Livia Vittori Antisari, Gianluca Bianchini. Soil Carbon Investigation in Three Pedoclimatic and Agronomic Settings of Northern Italy. Sustainability. 2020; 12 (24):10539.
Chicago/Turabian StyleValentina Brombin; Enrico Mistri; Mauro De Feudis; Camilla Forti; Gian Salani; Claudio Natali; Gloria Falsone; Livia Vittori Antisari; Gianluca Bianchini. 2020. "Soil Carbon Investigation in Three Pedoclimatic and Agronomic Settings of Northern Italy." Sustainability 12, no. 24: 10539.
Oligocene trachytes from the Euganean Hills include various regionally metamorphosed gneissic and granulitic xenoliths. These xenoliths provide the unique opportunity to investigate South Alpine intermediate to deep crustal levels that are not at present exposed in the Eastern Alps. The estimated P–T conditions are in the range of 780–850°C and 0.45–0.55 GPa for a migmatitic gneiss xenolith. Sensitive high-resolution ion microprobe (SHRIMP II) U–Pb analyses on zircon from this xenolith provide concordant ages around 259.7 ± 3.5 Ma, consistent with a proton-induced X-ray emission (PIXE) U–Th–Pb age on monazite of 262 ± 12 Ma. The Sr–Nd–Pb isotopic compositions, and major and trace element data show distinct origins for the different types of xenoliths. Mafic granulite xenoliths have an isotopic signature close to mantle-derived rocks and to Permian gabbroic rocks from the Western Southern Alps. Metapelite xenoliths have high Sr and low Nd initial ratios like those of acid crustal rocks and could possibly represent the source of the crustal component that is dominant in the acid Permian supervolcanoes. The migmatitic xenolith provides the first documented evidence for a Permian thermal event associated with crustal thinning in the Eastern Southern Alps. Here the South Alpine basement escaped most of the Alpine crustal shortening and still preserves most of the original Permian extension under thick Mesozoic cover.Supplementary material: Microprobe analyses of mineralogical phases and Ti-in-biotite geothermometric calculations are available at https://doi.org/10.6084/m9.figshare.c.5032337
Raffaele Sassi; Claudio Mazzoli; Renaud Merle; Valentina Brombin; Massimo Chiaradia; Daniel J. Dunkley; Andrea Marzoli. HT–LP crustal syntectonic anatexis as a source of the Permian magmatism in the Eastern Southern Alps: evidence from xenoliths in the Euganean trachytes (NE Italy). Journal of the Geological Society 2020, 177, 1211 -1230.
AMA StyleRaffaele Sassi, Claudio Mazzoli, Renaud Merle, Valentina Brombin, Massimo Chiaradia, Daniel J. Dunkley, Andrea Marzoli. HT–LP crustal syntectonic anatexis as a source of the Permian magmatism in the Eastern Southern Alps: evidence from xenoliths in the Euganean trachytes (NE Italy). Journal of the Geological Society. 2020; 177 (6):1211-1230.
Chicago/Turabian StyleRaffaele Sassi; Claudio Mazzoli; Renaud Merle; Valentina Brombin; Massimo Chiaradia; Daniel J. Dunkley; Andrea Marzoli. 2020. "HT–LP crustal syntectonic anatexis as a source of the Permian magmatism in the Eastern Southern Alps: evidence from xenoliths in the Euganean trachytes (NE Italy)." Journal of the Geological Society 177, no. 6: 1211-1230.
In the Main Ethiopian Rift (MER) area, rural populations often use water that exceeds the World Health Organization thresholds for fluoride (F–) and arsenic (As), two elements that are hazardous for human health. In this study, twenty-nine water samples were collected from lakes and hot and cold springs in southern MER to investigate source(s) and health-risk of the F– and As contamination. According to major ion and trace element analyses, only cold spring water is safe for consumption, whereas hot spring water is the most contaminated. Leaching tests performed with the MER rhyolitic volcanic rocks and their weathered products (fluvio-lacustrine sediments) demonstrate that the main cause of the F– and As release is geogenic, i.e., not related to anthropogenic activities. The weathering of volcanic glass and minerals (apatites, clays, hydro-oxides) by CO2-bearing alkaline water induces the mobilisation of F– and As from solid to liquid phase. This process is particularly fast, when fluvio-lacustrine sediments are involved, and can be further enhanced by hot groundwater leaching. This study, investigating the distribution, sources, and mechanisms of F– and As release in MER water, could be of interest also for other sectors of the East African Rift and other similar volcano-tectonic settings.
Gianluca Bianchini; Valentina Brombin; Chiara Marchina; Claudio Natali; Tewodros Rango Godebo; Alessandro Rasini; Gian Marco Salani. Origin of Fluoride and Arsenic in the Main Ethiopian Rift Waters. Minerals 2020, 10, 453 .
AMA StyleGianluca Bianchini, Valentina Brombin, Chiara Marchina, Claudio Natali, Tewodros Rango Godebo, Alessandro Rasini, Gian Marco Salani. Origin of Fluoride and Arsenic in the Main Ethiopian Rift Waters. Minerals. 2020; 10 (5):453.
Chicago/Turabian StyleGianluca Bianchini; Valentina Brombin; Chiara Marchina; Claudio Natali; Tewodros Rango Godebo; Alessandro Rasini; Gian Marco Salani. 2020. "Origin of Fluoride and Arsenic in the Main Ethiopian Rift Waters." Minerals 10, no. 5: 453.
In the Republic of Macedonia, construction and demolition (C&D) waste is often dumped, underestimating the potential recycling and re-use as raw materials for civil engineering works and/or cement/ceramic industries. SAMCODE (Sustainable Approach to Managing Construction and Demolition Waste) is a know-how exchange program, the focus of which is chemical characterisation in terms of major and trace elements in order to evaluate the possible Macedonian C&D waste recycling. Thirty-nine C&D waste samples were collected from different dumps in Skopje and surroundings. X-ray fluorescence analyses, carried out on powdered samples, show i) highly variable concentrations, indicative of the heterogenous nature of C&D waste, and ii) high concentration in Cr, Ni, and Zn with respect to Italian, Chinese, and Dutch tolerance limits, probably due to the presence of these elements in ophiolitic rocks and sulphide-bearing deposits, used as raw material in building activity. Inductively coupled plasma mass spectrometry analyses of leachates, performed to assess the mobility of heavy metals, show significant concentrations of Cr, and to a lesser extent, Ni. Results suggest that homogenisation processes of the recycled materials should be implemented and preliminary screening of C&D waste should be performed to eliminate heavy metals-bearing components.
Gianluca Bianchini; Igor Ristovski; Igor Milcov; Alojz Zupac; Claudio Natali; Gian Marco Salani; Chiara Marchina; Valentina Brombin; Andrea Ferraboschi. Chemical Characterisation of Construction and Demolition Waste in Skopje City and Its Surroundings (Republic of Macedonia). Sustainability 2020, 12, 2055 .
AMA StyleGianluca Bianchini, Igor Ristovski, Igor Milcov, Alojz Zupac, Claudio Natali, Gian Marco Salani, Chiara Marchina, Valentina Brombin, Andrea Ferraboschi. Chemical Characterisation of Construction and Demolition Waste in Skopje City and Its Surroundings (Republic of Macedonia). Sustainability. 2020; 12 (5):2055.
Chicago/Turabian StyleGianluca Bianchini; Igor Ristovski; Igor Milcov; Alojz Zupac; Claudio Natali; Gian Marco Salani; Chiara Marchina; Valentina Brombin; Andrea Ferraboschi. 2020. "Chemical Characterisation of Construction and Demolition Waste in Skopje City and Its Surroundings (Republic of Macedonia)." Sustainability 12, no. 5: 2055.
The complex European–Adria geodynamic framework, which led to the formation of the Alpine belt, is considered responsible for the orogenic magmatism that occurred in the Central Alps along the Periadriatic/Insubric Line (late Eocene–early Oligocene) and the anorogenic magmatism that occurred in the Southeastern Alps (late Paleocene–early Miocene). While the subduction-related magmatic activities are, as expected, near convergent margins, the occurrence of the intraplate-related magmatism is still puzzling. Therefore, in this work new geochemical and geochronological data of magmatic products from the Veneto Volcanic Province (VVP, north–east Italy) are provided to constrain the Cenozoic intraplate magmatism of the Southeastern Alps. The VVP is formed by dominant basic–ultrabasic (from nephelinites to tholeiites) magmatic products and by localized acid (latitic, trachytic, and rhyolitic) volcanic and subvolcanic bodies. Trace element patterns and ratios suggest that the mantle source of the alkaline magma types was a garnet lherzolite possibly metasomatised by carbonatitic melts and with residual phlogopite. According to the biostratigraphic records and our new 40Ar/39Ar ages, VVP eruptions occurred in several pulses, reflecting the extensional phases experienced by the Eastern Alpine domain. The volcanism started in the late Paleocene in the western sector of the VVP where activity was widespread also during the Eocene (45.21 ± 0.11 Ma – 38.73 ± 0.44 Ma). In the eastern sector eruptions took place in the early Oligocene (32.35 ± 0.09 Ma – 32.09 ± 0.29 Ma) and in the early Miocene (~23–22 Ma). From the studies so far undertaken, the anorogenic magmatic activity of the VVP was interpreted as resulting from mantle upwellings through slab window(s) following the European slab break-off, which occurred at ~ 35 Ma. However, considering (i) new tomographic images evidencing a continuous subvertical (~ 500 km in depth) slab beneath the Central Alps, and (ii) the onset of magmatic activity in the VVP in the late Paleocene (i.e., before the slab break-off) and its continuation until the Miocene, a better suited geodynamic scenario is required to explain the anorogenic magmatism. The westward rollback of the European slab caused the retreat and steepening of the subducting plate. As a consequence, sub-slab mantle material escaped and upwelled from the front of the slab and created a poloidal mantle flow. The latter induced the breakdown of carbonates in calcareous metasediments and carbonated metabasics within the subducting oceanic slab, providing carbonatitic melts, which could be responsible for the metasomatism of the VVP mantle sources. After that, the poloidal mantle flow also induced (i) the extensional deformation in the overriding Adria microplate, (ii) the decompressional melting of VVP mantle sources, and (iii) the intraplate affinity of the VVP magmatism. During these processes, the Adria microplate also rotated counterclockwise, forming sedimentary basins, and allowing the poloidal mantle flow to affect different portions of the overlying lithosphere, generating syn-estensional magmatism within the VVP.
Valentina Brombin; Costanza Bonadiman; Fred Jourdan; Guido Roghi; Massimo Coltorti; Laura E. Webb; Sara Callegaro; Giuliano Bellieni; Giampaolo De Vecchi; Roberto Sedea; Andrea Marzoli. Intraplate magmatism at a convergent plate boundary: The case of the Cenozoic northern Adria magmatism. Earth-Science Reviews 2019, 192, 355 -378.
AMA StyleValentina Brombin, Costanza Bonadiman, Fred Jourdan, Guido Roghi, Massimo Coltorti, Laura E. Webb, Sara Callegaro, Giuliano Bellieni, Giampaolo De Vecchi, Roberto Sedea, Andrea Marzoli. Intraplate magmatism at a convergent plate boundary: The case of the Cenozoic northern Adria magmatism. Earth-Science Reviews. 2019; 192 ():355-378.
Chicago/Turabian StyleValentina Brombin; Costanza Bonadiman; Fred Jourdan; Guido Roghi; Massimo Coltorti; Laura E. Webb; Sara Callegaro; Giuliano Bellieni; Giampaolo De Vecchi; Roberto Sedea; Andrea Marzoli. 2019. "Intraplate magmatism at a convergent plate boundary: The case of the Cenozoic northern Adria magmatism." Earth-Science Reviews 192, no. : 355-378.
The Veneto Volcanic Province (VVP), a Cenozoic magmatic province in northeastern Italy, is one of the widest volcanic areas of the Adria plate. It consists of five main magmatic districts, and its most primitive products commonly host mantle xenoliths. In this study, we present a newly discovered xenolith suite from the Marosticano district that contains peridotites with compositional characteristics of mineral assemblages that provide insight into an unexpected nature of the sub-continental lithospheric mantle (SCLM) of the Adria plate. In contrast to xenoliths from other VVP sites previously studied (i.e., Val d’Adige and Lessini Mts.), Marosticano xenoliths exhibit highly refractory compositions typical of on-craton peridotites. High olivine forsteritic contents (Fo: 91-93) indicate high degrees of partial melting (>25%) that should have been associated with the complete consumption of clinopyroxene. Major and trace element compositions further link these peridotite fragments to early Proterozoic cratonic mantle. The occurrence of clinopyroxene within such rocks suggests Marosticano clinopyroxene testify to a metasomatic legacy. The i) LREE-enrichments of Marosticano clinopyroxene and ii) the dissolved CO2 mole fractions (up to 1.0) for the inferred clinopyroxene-forming melt are consistent with carbonatite/CO2-rich silicatic melts as metasomatic agents. The latter could be responsible for the equilibrium temperatures (1033-1117 °C) and oxidizing conditions [logfO2 (FMQ)= -0.6 - +1.1], anomalously high for a cratonic environment but similar to the off-craton VVP xenoliths. The cratonic signature and carbonatite/CO2-rich silicate metasomatism found together in the Marosticano mantle xenoliths reveal that ancient features can be preserved in SCLM in a young, active geodynamic setting such as the Adria plate boundary. In this framework Lessini Mts. and Val d’Adige xenoliths could be interpreted as circumcratonic reminiscent domains affected by refertilization due to infiltration of asthenosphere-derived melts,rather than newly accreted “off-craton” SCLM. These new interpretations could be useful for completing the reconstruction of the Africa/Eurasia interplay during the Alpine collision
Valentina Brombin; Costanza Bonadiman; Massimo Coltorti; M. Florencia Fahnestock; Julia G. Bryce; Andrea Marzoli. Refertilized mantle keel below the Southern Alps domain (North-East Italy): Evidence from Marosticano refractory mantle peridotites. Lithos 2018, 300-301, 72 -85.
AMA StyleValentina Brombin, Costanza Bonadiman, Massimo Coltorti, M. Florencia Fahnestock, Julia G. Bryce, Andrea Marzoli. Refertilized mantle keel below the Southern Alps domain (North-East Italy): Evidence from Marosticano refractory mantle peridotites. Lithos. 2018; 300-301 ():72-85.
Chicago/Turabian StyleValentina Brombin; Costanza Bonadiman; Massimo Coltorti; M. Florencia Fahnestock; Julia G. Bryce; Andrea Marzoli. 2018. "Refertilized mantle keel below the Southern Alps domain (North-East Italy): Evidence from Marosticano refractory mantle peridotites." Lithos 300-301, no. : 72-85.