Mineralogical, Geochemical and Nd Isotopic Study of the Meta-Clastic Rocks of the Paleoproterozoic Mahakoshal Basin, Central Indian Tectonic Zone: Implications for Provenance Characterization, Paleoweathering Conditions and Tectonic Setting
Kamaal Parvez, M. E. A. Mondal, Iftikhar Ahmad, Waliur Rahaman, Anil D. Shukla, Wamiq Mohammed Khan
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引用次数: 0
Abstract
The present study focuses on the petrographic studies, XRD patterns, whole-rock geochemical data and Nd isotopic data of the clastic rocks of the Paleoproterozoic Mahakoshal Basin which includes meta-argillites, meta-greywackes and quartzites to characterize their provenance, tectonic setting, weathering intensity, and paleoclimate condition. Geochemically, the rock samples of meta-argillite and meta-greywacke in the bivariate plot Log Na2O/K2O vs. Log SiO2/Al2O3 are classified as litharenite and greywacke. The samples of quartzite fall in the fields from the sublitharenite to quartzarenite. The weathering indices such as CIA, \(\alpha _{{{\text{Ca}}}}^{{{\text{Al}}}}\), \(\alpha _{{{\text{Na}}}}^{{{\text{Al}}}}\), \(\alpha _{{\text{K}}}^{{{\text{Al}}}}\), \(\alpha _{{{\text{Sr}}}}^{{{\text{Al}}}}\), \(\alpha _{{{\text{Ba}}}}^{{{\text{Al}}}}\) and Th/U suggest that the clastic rocks have undergone moderate to intense chemical weathering and show K-metasomatism. Chondrite normalized REE patterns, discriminant diagrams of La–Th–Sc and Ni–V–10*Th and various transition elements ratio such as Cr/Th, Th/Co, Th/Sc, and La/Sc support the mixing of the mafic, intermediate and felsic sources. The Eu anomaly is highly variable and ranges from 0.29 to 1.08 and supports that the sediments have been derived from the heterogeneous source. TCHUR model ages are consistent with 1.98–2.92 Ga possible provenance. εNd(t) and f(Sm/Nd) values overlap with the arc and the Archean crust signatures indicating that the sediments are derived from a Paleoproterozoic arc and older Archean crust (TTG gneisses and Archean granite). The opening of the Mahakoshal Basin is characterized by the retreating accretionary orogen and the closure of the basin is due to switching retreating accretionary orogen into advancing accretionary orogen which is contemporaneous to the assembly of the Columbia Supercontinent (∼1.8 Ga).
期刊介绍：
Geochemistry International is a peer reviewed journal that publishes articles on cosmochemistry; geochemistry of magmatic, metamorphic, hydrothermal, and sedimentary processes; isotope geochemistry; organic geochemistry; applied geochemistry; and chemistry of the environment. Geochemistry International provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
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