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Journals / Türkiye Jeoloji Bülteni / 2021 / Cilt: 64 - Sayı: 1

Geochemical and Petrological Studies of Permo-Carboniferous Sandstones from the Rangit Pebble-Slate Formation, Sikkim Lesser Himalaya, India: Implication for Provenance, Tectonic Setting, and Paleoclimate

Raj Kumar PRIYA
Vinod TEWARİ
Rakesh RANJAN
Pages
129–142
Publication Date
2020-12-08
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Chemical Index of Alteration was used to depict the weathering trends of all studied samples which reflect paleo-sedimentation under humid to sub-humid climatic conditions.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:The Permo-Carboniferous depositional sequence of Lower Gondwana in Sikkim Lesser Himalaya was investigated through an integrated approach of lithological, petrological, and geochemical studies.
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Key Findings & Data:Lithologically, it is characterized by glacial diamictite at the base and shale-sandstone facies at the top of a sequence which is interpreted as a glaciomarine deposit.
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Conclusion & Impact:Chemical Index of Alteration was used to depict the weathering trends of all studied samples which reflect paleo-sedimentation under humid to sub-humid climatic conditions.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Gondwana · Geochemistry · Paleoclimate

Abstract

The Permo-Carboniferous depositional sequence of Lower Gondwana in Sikkim Lesser Himalaya was investigated through an integrated approach of lithological, petrological, and geochemical studies. Lithologically, it is characterized by glacial diamictite at the base and shale-sandstone facies at the top of a sequence which is interpreted as a glaciomarine deposit. Coarser sandstone and massive diamictite composed of quartz, feldspar, muscovite, zircon, and other lithic fragments are observed in thin section. Geochemistry of all studied samples from the Rangit Pebble Slate Formation shows the dominance of silicon dioxide compared to other elemental oxides. The tectonic discrimination diagram positively infers passive margin sedimentation from a felsic-rich provenance. Chemical Index of Alteration was used to depict the weathering trends of all studied samples which reflect paleo-sedimentation under humid to sub-humid climatic conditions.

Özet

The Permo-Carboniferous depositional sequence of Lower Gondwana in Sikkim Lesser Himalaya was investigated through an integrated approach of lithological, petrological, and geochemical studies. Lithologically, it is characterized by glacial diamictite at the base and shale-sandstone facies at the top of a sequence which is interpreted as a glaciomarine deposit. Coarser sandstone and massive diamictite composed of quartz, feldspar, muscovite, zircon, and other lithic fragments are observed in thin section. Geochemistry of all studied samples from the Rangit Pebble Slate Formation shows the dominance of silicon dioxide compared to other elemental oxides. The tectonic discrimination diagram positively infers passive margin sedimentation from a felsic-rich provenance. Chemical Index of Alteration was used to depict the weathering trends of all studied samples which reflect paleo-sedimentation under humid to sub-humid climatic conditions.

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Cite This Article

PRIYA, R. K., TEWARİ, V., RANJAN, R. (2020). Geochemical and Petrological Studies of Permo-Carboniferous Sandstones from the Rangit Pebble-Slate Formation, Sikkim Lesser Himalaya, India: Implication for Provenance, Tectonic Setting, and Paleoclimate. Türkiye Jeoloji Bülteni, Cilt: 64 - Sayı: 1, 129–142. https://ajindex.com/articles/81981

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References (9)

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