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• W4386814097 endingPage "107357" @default.
• W4386814097 startingPage "107357" @default.
• W4386814097 abstract "The granitoid magmatism in the Chitradurga greenstone belt implies crustal reworking in the western Dharwar Craton during the Neoarchean. The high-K granite and the low-K trondhjemites are studied for their petrogenesis using the whole-rock elemental and Nd isotopic composition and compared with the earlier works. These granitoids are formed by partial reworking of older crust, which includes TTG gneisses and metabasites. Low Sr/Y ratios (0.1–7.6) and zircon saturation temperatures (< 850 °C) suggest that crustal anatexis occurred in the shallower crustal levels by low-T fluid-present melting. Phase equilibrium and trace element modelling show that the potassic granite are formed by partial melting of TTG gneisses at shallower depths corresponds to 4–6 kb pressures and melt extraction in batches leaving a final residue comprise ~66% plagioclase, ~ 30% quartz, ~ 3% orthopyroxene, and ~ 1% ilmenite. Monzogranite formed from the melt extracted at a higher temperature with some entrained minerals, whereas the early batches of water saturated melt modified by fractional crystallization during the ascent formed syenogranite. The low-K trondhjemites are formed by 10–12% partial melting of metabasites at 4–5 kb pressures, leaving residual assemblages with plagioclase (42–46%), amphibole (24–26%), orthopyroxene (20–21%), ilmenite (4–5%), and garnet (2–9%). The partial melting of various crustal source rocks at different crustal levels indicates a reworking event in the terrane, which was likely triggered by mafic underplating and H2O dominated fluid flux." @default.
• W4386814097 created "2023-09-18" @default.
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• W4386814097 date "2023-12-01" @default.
• W4386814097 modified "2023-10-03" @default.
• W4386814097 title "Neoarchean crustal reworking inferred from granitoids in the western Dharwar Craton: Constraints from Nd isotopic composition, trace elements, and phase equilibrium modelling" @default.
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• W4386814097 doi "https://doi.org/10.1016/j.lithos.2023.107357" @default.
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