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Petrology and geochemistry dataset of the Precambrian granitoids from the part of Gadwal schist belt, Eastern Dharwar Craton India.

ABSTRACT: The data presented in this article related to the research article entitled "Petrology and Geochemistry of the Precambrian granitoids from the part of Gadwal schist belt, Eastern Dharwar craton India". The granitoids from the Gadwal schist belt area of the Telangana State are confined to Precambrian gneissic complex part of Eastern Dharwar Craton. The article described the petrology and whole rock geochemistry in the Precambrian gneissic complex part of gadwall schist belt. The whole rock geochemistry is made publicity available to enable significant analyzes.

SUBMITTER: Ramakrishna P

PROVIDER: S-EPMC6488742 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Petrology and geochemistry dataset of the Precambrian granitoids from the part of Gadwal schist belt, Eastern Dharwar Craton India.

Ramakrishna P P Anjaneyulu M M Praveen K K

Data in brief 20190307

The data presented in this article related to the research article entitled "Petrology and Geochemistry of the Precambrian granitoids from the part of Gadwal schist belt, Eastern Dharwar craton India". The granitoids from the Gadwal schist belt area of the Telangana State are confined to Precambrian gneissic complex part of Eastern Dharwar Craton. The article described the petrology and whole rock geochemistry in the Precambrian gneissic complex part of gadwall schist belt. The whole rock geoche ...[more]

PMID: 31061852

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Project description:Oxide minerals contained in ultramafic rocks are useful tools to assess the redox conditions of the rock and fluids liberated upon progressive serpentinite dehydration during subduction, as these minerals contain a relevant redox-sensitive element, iron. Previous studies have revealed that magnetite predominates across the antigorite-out reaction. However, the fate of magnetite and other oxides at higher pressure and temperature conditions has remained underexplored. We present a comprehensive petrological and geochemical study of oxide-sulfide-silicate mineral assemblages in metaperidotites beyond antigorite- and chlorite-out reactions (T = 650-850 °C and P = 1-3 GPa). Several ultramafic lenses, covering different bulk rock compositions and extents of oxidation upon oceanic serpentinization, were investigated from the Central Alps, Switzerland. Results point to two endmember scenarios: (i) Most frequently, metaperidotites have olivine with a Mg# of 89-91 (defined as molar Mg/(Mg + Fetot) × 100) and contain low oxide modes (0.06-1.41 vol.%), hematite is absent, and redox conditions are weakly oxidized and buffered by orthopyroxene-olivine-magnetite. (ii) Rare occurrence, high olivine Mg# > 94.5 metaperidotites display coexisting hematite and magnetite, high oxide modes (up to 4 vol.%), and redox conditions are hematite-magnetite (HM) buffered (Δlog10fO2,QFM of + 3 to + 4). Spinel displays evolving compositions from magnetite over chromite to Al-Cr-spinel, roughly correlating with increasing temperature. Most of the samples buffered by the olivine-orthopyroxene-magnetite assemblage contain coexisting pentlandite ± pyrrhotite, thus identifying stable sulfides beyond antigorite dehydration for these weakly oxidized samples (Δlog10fO2,QFM < 2.5). No sulfides were recognized in the highly oxidized sample. The transition of magnetite to chromite at around 700 °C goes along with a shift in fO2 to lower values. At the prevailing oxygen fugacity in the weakly oxidized metaperidotites sulfur in a coexisting fluid is always present in its reduced form. However, oxidized sulfur can be stable in the dehydration fluids released from highly oxidized serpentinites.Supplementary informationThe online version contains supplementary material available at 10.1007/s00410-023-02032-w.

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Dataset Information

Petrology and geochemistry dataset of the Precambrian granitoids from the part of Gadwal schist belt, Eastern Dharwar Craton India.

Publications

Petrology and geochemistry dataset of the Precambrian granitoids from the part of Gadwal schist belt, Eastern Dharwar Craton India.

Similar Datasets

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