Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 48381 10.2205/2021ES000756 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Geochemical (REE and Trace elements) characteristics and tectonic setting discrimination of Permo-Carboniferous sandstone from Sikkim Lesser Himalaya, NE India Geochemical (REE and Trace elements) characteristics and tectonic setting discrimination of Permo-Carboniferous sandstone from Sikkim Lesser Himalaya, NE India Priya Raj Kumar Priya Raj Kumar Tewari V. C. Tewari V. C. Ranjan R. K. Ranjan R. K. 26 01 2022 26 01 2022 21 5 1 9 16 04 2020 14 01 2021 https://rjes.ru/en/nauka/article/48381/view

The geochemical (REE & traces elements) characteristics of Permo-Carboniferous sandstone has been taken into account to decipher tectonic setting and provenance of the Rangit Pebble Slate Formation of Sikkim Lesser Himalaya. The chondrite normalized REE pattern with Eu negative anomaly and a bivariate plot (Th/Co-La/Sc) clearly indicates that studied sediments were likely derived from upper crust felsic source. The average elemental ratio of traces elements La/Sc (∼ 3.85), Th/Sc (∼ 2.57), Cr/Th (∼ 6.64), Th/Co (∼ 2.52), La/Co (∼ 3.74), and Eu/Eu* (∼ 0.32) also shows close affinities with Upper Continental Crust. The trivariate plot (La-Th-Sc plot, Th-Sc-Zr/10 plot, & Th-Co-Zr/10 plot) and a bivariate plot (Ti/Zr-La/Sc) plotted on the field of passive tectonic region for the Rangit Pebble Slate Formation sandstone. A binary plot between the ratio of Th/Sc-Zr/Sc and Th/U-Th reflects the enrichment of zircon and weathering trend during sedimentary recycling.

The geochemical (REE & traces elements) characteristics of Permo-Carboniferous sandstone has been taken into account to decipher tectonic setting and provenance of the Rangit Pebble Slate Formation of Sikkim Lesser Himalaya. The chondrite normalized REE pattern with Eu negative anomaly and a bivariate plot (Th/Co-La/Sc) clearly indicates that studied sediments were likely derived from upper crust felsic source. The average elemental ratio of traces elements La/Sc (∼ 3.85), Th/Sc (∼ 2.57), Cr/Th (∼ 6.64), Th/Co (∼ 2.52), La/Co (∼ 3.74), and Eu/Eu* (∼ 0.32) also shows close affinities with Upper Continental Crust. The trivariate plot (La-Th-Sc plot, Th-Sc-Zr/10 plot, & Th-Co-Zr/10 plot) and a bivariate plot (Ti/Zr-La/Sc) plotted on the field of passive tectonic region for the Rangit Pebble Slate Formation sandstone. A binary plot between the ratio of Th/Sc-Zr/Sc and Th/U-Th reflects the enrichment of zircon and weathering trend during sedimentary recycling.

 Geochemistry provenance tectonic setting Sikkim Lesser Himalaya India Geochemistry provenance tectonic setting Sikkim Lesser Himalaya India The authors are thankful to the Head of Department, Sikkim University for his constant support and providing infrastructural facilities. Direc- tor, Birbal Sahni Institute of Palaeoscience, Lucknow, India is thanked for providing the facilities of the geo- chemical laboratory of the Institute. We are grateful to Dr. N. Wanjari for discussions and suggestions. Anony- mous reviewer is thanked for constructive comments and valuable suggestions to improve themanuscript. R.K.P. thanks Sikkim University for award of research fellow- ship to carry out this research. The authors are thankful to the Head of Department, Sikkim University for his constant support and providing infrastructural facilities. Direc- tor, Birbal Sahni Institute of Palaeoscience, Lucknow, India is thanked for providing the facilities of the geo- chemical laboratory of the Institute. We are grateful to Dr. N. Wanjari for discussions and suggestions. Anony- mous reviewer is thanked for constructive comments and valuable suggestions to improve themanuscript. R.K.P. thanks Sikkim University for award of research fellow- ship to carry out this research.

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