Low-temperature hydrothermal Pt mineralization in uvarovite-bearing ophiolitic chromitites from the Dominican Republic

Farré-de-Pablo, Júlia; Proenza, Joaquín A.; Gonzáléz-Jiménez, José María; Aiglsperger, Thomas; Torró, Lisard; Domènech, Cristina; Garcia‐Casco, Antonio

doi:10.1007/s00126-021-01079-8

Cited by 9 publications

(4 citation statements)

References 82 publications

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“…Spessartine and almandine-spessartine varieties are also common in felsic igneous rocks such as granite and pegmatites in addition to manganese-rich metamorphic rocks (Deer et al, 1982;Makrygina and Suvorova, 2011;Nesse, 2013). Uvarovite is rare and occurs in chromite-rich metasomatic or hydrothermal environments (Deer et al, 1982;Farré-de-Pablo et al, 2022;Melcher et al, 1997;Nesse, 2013). The complex story of garnet mineral evolution and diverse formational environments provides an excellent case study to investigate the relationship between paragenetic modes, geochemical data, and location information through natural kind clusters (Boujibar et al, 2021;Hazen, 2019;Morrison, 2020, 2021;Hazen et al, 2008Hazen, 2020, 2021;Nesse, 2013).…”

Section: Garnetsmentioning

confidence: 99%

The secret life of garnets: a comprehensive, standardized dataset of garnet geochemical analyses integrating localities and petrogenesis

Chiama,

Gabor,

Lupini

et al. 2023

Earth Syst. Sci. Data

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Abstract. Integrating mineralogy with data science is critical to modernizing Earth materials research and its applications to geosciences. Data were compiled on 95 650 garnet sample analyses from a variety of sources, ranging from large repositories (EarthChem, RRUFF, MetPetDB) to individual peer-reviewed literature. An important feature is the inclusion of mineralogical “dark data” from papers published prior to 1990. Garnets are commonly used as indicators of formation environments, which directly correlate with their geochemical properties; thus, they are an ideal subject for the creation of an extensive data resource that incorporates composition, locality information, paragenetic mode, age, temperature, pressure, and geochemistry. For the data extracted from existing databases and literature, we increased the resolution of several key aspects, including petrogenetic and paragenetic attributes, which we extended from generic material type (e.g., igneous, metamorphic) to more specific rock-type names (e.g., diorite, eclogite, skarn) and locality information, increasing specificity by examining the continent, country, area, geological context, longitude, and latitude. Likewise, we utilized end-member and quality index calculations to help assess the garnet sample analysis quality. This comprehensive dataset of garnet information is an open-access resource available in the Evolutionary System of Mineralogy Database (ESMD) for future mineralogical studies, paving the way for characterizing correlations between chemical composition and paragenesis through natural kind clustering (Chiama et al., 2022; https://doi.org/10.48484/camh-xy98). We encourage scientists to contribute their own unpublished and unarchived analyses to the growing data repositories of mineralogical information that are increasingly valuable for advancing scientific discovery.

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Section: Garnetsmentioning

confidence: 99%

The secret life of garnets: a comprehensive, standardized dataset of garnet geochemical analyses integrating localities and petrogenesis

Chiama,

Gabor,

Lupini

et al. 2023

Earth Syst. Sci. Data

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“…During the regional extensional deformation, the chromitites experienced a greenschist facies overprint (Siron et al, 2018 and references therein) and garnet was crystallized within shear and brecciated zones at temperatures <400 C. Solutions enriched in Fe 3+ interacted with the porous chromite creating Fe 3+ enriched chromite and magnetite. Chlorite was re-equilibrated at temperatures <300 C. Secondary PPGE-rich PGM and As-Sb bearing minerals were observed within the chlorite matrix, representing a low-T stage (greenschist facies) whereby PPGE mobile (Tsikouras et al, 2006;Farré-de-Pablo et al, 2021) and As-Sb were incorporated during serpentinization due to input from a sedimentary source (Deschamps et al, 2011;Koutsovitis, 2017).…”

Section: Cr-ore Genesis and Post-magmatic Modification In The Tvg Com...mentioning

confidence: 99%

“…However, ophiolites in many cases are subjected to low-T alteration and metasomatic processes or high grade metamorphism, which may affect the chromitite bodies, causing mineralogical changes (Zaccarini et al, 2005;González-Jiménez et al, 2015;Xiong et al, 2021). Primary silicates will transform into serpentine, talc, chlorite and to a lesser extent into secondary Cr-bearing garnet (Tsoupas and Economou-Eliopoulos, 2008;Kapsiotis et al, 2017;Farré-de-Pablo et al, 2021). Although spinel and PGM are usually less susceptible to hydrothermal and metamorphic overprints (Sideridis et al, 2022), they may produce unique textures and change their primary compositional and mineralogical assemblages (Zaccarini et al, 2005;Kapsiotis et al, 2009;Gervilla et al, 2012;de Melo Portella et al, 2016;Arai et al, 2020;Grieco et al, 2020;Farré-de-Pablo et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Post-magmatic processes recorded in bimodal chromitites of the East Chalkidiki meta-ultramafic bodies, Gomati and Nea Roda, Northern Greece

Sideridis

Tsikouras²,

Tsitsanis³

et al. 2022

Front. Earth Sci.

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The meta-ultramafic bodies of Gomati and Nea Roda are situated in the Serbomacedonian Massif. They demonstrate bimodal character in terms of chromitite chemistry with both Cr- and Al-rich chromitites outcropping in proximity, with no obvious tectonic structure intercepting those two varieties. Based on the trace element abundances in spinel grains, metamorphosis reached amphibolite facies, forming porous spinel. Chromitite-hosted chlorite and garnet chemistry correlates with greenschist facies temperatures and formation of zoned spinel grains. Despite the metamorphic overprint, some of the primary features of the chromitites have been preserved. The PGE contents demonstrate an increase in Pd/Ir ratios in some chromitites pointing to fractionation, whereas low ratios of mostly Cr-rich chromitites point to partial melting being the main mechanism that controls PGE mineralization. The normalized trace element patterns of spinel-group minerals revealed that Al-rich chromitites were generated in spreading settings in a back-arc and the Cr-rich counterparts in SSZ environment. The parental melts of Al-rich and Cr-rich chromitites demonstrate MORB and boninitic affinities, respectively. The meta-ultramafic protoliths were modified within a subduction zone, with significant input of a sedimentary source, as confirmed by the chemistry of serpentinite, diopside and Sb-mineralization. These results suggest common geotectonic processes within the Rhodope and the Serbomacedonian massif, that have affected the ultramafic bodies and chromitite occurrences.

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“…Moreover, clinopyroxene has also been described as a suitable source of Ca in uvarovite through its congruent dissolution during serpentinization (Ghosh & Morishita, 2011). During serpentinization, Ca-bearing hydrothermal fluids infiltrated the chromitite bodies through fracture and precipitated uvarovite (Farré-de-Pablo et al, 2021). The presence of euhedral garnet inclusions in chromite can give us insights into the closure T of the chromitite-forming system.…”

Section: Origin Of the Silicate Inclusionsmentioning

confidence: 99%

Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings

Singh

Bidyananda

Kapsiotis³

2022

Geological Journal

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Low‐Al chromitites from the Manipur ophiolite contain a wide range of mineral inclusions, including hydrous and anhydrous silicates, sulphides, and platinum group minerals (PGM). The common inclusions are primary silicates, such as clinopyroxene, orthopyroxene and secondary silicate inclusions, such as chlorite, serpentine, and garnet. These inclusions are small (<30 μm in PGM, <100 μm in silicates) and randomly distributed throughout their host chromite grains. The shape and texture indicate some inclusions (clinopyroxene, orthopyroxene, PGMs) trapped during the magmatic stage and most inclusions (chlorite, serpentine, and uvarovite) trapped during recrystallization of chromite. Clinopyroxene was discrete inside the chromite, with Cr2O3 content ranging from 0.62 to 1.77 wt.%, and Al2O3 varying between 0.96 to 1.63 wt.%. Orthopyroxene is enstatite (En93Wo2Fs4), Cr2O3 varies from 0.58 to 1.8 wt.% and the minor amount of CaO (0.41–0.81 wt.%), and Al2O3 (0.58–0.83 wt.%). Uvarovite is present in two forms: discrete crystal inclusions (anhydrous) in chromites and fractures (hydrous) as fillings. The chlorite occurs as lath shaped, and patchy phase is Cr‐rich variety ‐ kammererite (clinochlore) and penninite with variable Cr2O3 (0.22–7.25 wt.%) and FeO (2.5–3.9 wt.%). The PGM in the studied chromite are laurite (Ru, Os, Ir)S2. The parental melts of chromitites had low TiO2 (0.16–0.48 wt.%) and Al2O3 (10.18–14.58 wt.%) contents, and primary mineral inclusions, suggesting an arc‐like geochemical affinity, and the estimated melt composition is comparable with that of boninitic magma.

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Low-temperature hydrothermal Pt mineralization in uvarovite-bearing ophiolitic chromitites from the Dominican Republic

Cited by 9 publications

References 82 publications

The secret life of garnets: a comprehensive, standardized dataset of garnet geochemical analyses integrating localities and petrogenesis

The secret life of garnets: a comprehensive, standardized dataset of garnet geochemical analyses integrating localities and petrogenesis

Post-magmatic processes recorded in bimodal chromitites of the East Chalkidiki meta-ultramafic bodies, Gomati and Nea Roda, Northern Greece

Platinum‐group mineral and silicate inclusions in the low‐Al chromitites of the Manipur ophiolite, northeast India: Implications on Cr‐PGE mineralization in nascent subduction zone settings

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