Major and trace element geochemistry of the Atrai River sediments from the Bengal Basin (Bangladesh): implication for provenance, chemical weathering, and tectonic setting in the southeastern Himalaya
Abstract The Atrai River rises in the southeast Himalaya and empties into the Bengal Basin in the northwest. In this study, major and trace element geochemistry of the Atrai River sediments is carried out in addition to petrography to determine the compositional maturity, provenance, chemical weathering, and tectonic setting. X-ray fluorescence (XRF) spectrometry was employed for geochemical studies. Results reveal that, in comparison to the Upper Continental Crust (UCC), the sediments are significantly enriched in $ SiO_{2} $, $ Fe_{2} $$ O_{3,} $ Cr, and Ni and markedly depleted in $ Na_{2} $O, MgO, CaO, MnO, and $ TiO_{2} $. This is likely because feldspars were lost during chemical weathering. The sediments of the Atrai River are sub-arkosic in composition. The index of compositional variability (ICV) (0.95 to 1.35), and $ SiO_{2} $/$ Al_{2} $$ O_{3} $ ratio (6.15 to 6.81) in the Atrai River sediments suggest poorly sorted grains, and low compositional and mineralogical maturity. The geochemical and petrographic discriminate diagrams and high $ Al_{2} $$ O_{3} $/$ TiO_{2} $ values (20.57 to 32.55) indicate a felsic igneous provenance for the Atrai River sediments. They are mainly derived from granitic sources, with subordinate metamorphic and pre-existing sedimentary sources. The Higher Himalayas and the Lesser Himalayas are considered the possible source areas of the Atrai River sediments. Weathering indices (CIA, CIW, and PIA), as well as major and trace element discriminating diagrams, point to a weak-to-moderate degree of chemical weathering that may be prevalent in the source area under semi-arid climatic conditions. Petrographic and geochemical discriminating diagrams reveal an active margin tectonic setting for the Atrai River sediments..
| Medienart: |
Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:16 |
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| Enthalten in: |
Arabian journal of geosciences - 16(2023), 8 vom: 24. Juli |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Sayem, Abu Sadat Md. [VerfasserIn] |
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| Links: |
Volltext [lizenzpflichtig] |
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| Themen: |
Atrai River |
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| Anmerkungen: |
© Saudi Society for Geosciences and Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
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| doi: |
10.1007/s12517-023-11599-4 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
OLC2144632081 |
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| 245 | 1 | 0 | |a Major and trace element geochemistry of the Atrai River sediments from the Bengal Basin (Bangladesh): implication for provenance, chemical weathering, and tectonic setting in the southeastern Himalaya |
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| 520 | |a Abstract The Atrai River rises in the southeast Himalaya and empties into the Bengal Basin in the northwest. In this study, major and trace element geochemistry of the Atrai River sediments is carried out in addition to petrography to determine the compositional maturity, provenance, chemical weathering, and tectonic setting. X-ray fluorescence (XRF) spectrometry was employed for geochemical studies. Results reveal that, in comparison to the Upper Continental Crust (UCC), the sediments are significantly enriched in $ SiO_{2} $, $ Fe_{2} $$ O_{3,} $ Cr, and Ni and markedly depleted in $ Na_{2} $O, MgO, CaO, MnO, and $ TiO_{2} $. This is likely because feldspars were lost during chemical weathering. The sediments of the Atrai River are sub-arkosic in composition. The index of compositional variability (ICV) (0.95 to 1.35), and $ SiO_{2} $/$ Al_{2} $$ O_{3} $ ratio (6.15 to 6.81) in the Atrai River sediments suggest poorly sorted grains, and low compositional and mineralogical maturity. The geochemical and petrographic discriminate diagrams and high $ Al_{2} $$ O_{3} $/$ TiO_{2} $ values (20.57 to 32.55) indicate a felsic igneous provenance for the Atrai River sediments. They are mainly derived from granitic sources, with subordinate metamorphic and pre-existing sedimentary sources. The Higher Himalayas and the Lesser Himalayas are considered the possible source areas of the Atrai River sediments. Weathering indices (CIA, CIW, and PIA), as well as major and trace element discriminating diagrams, point to a weak-to-moderate degree of chemical weathering that may be prevalent in the source area under semi-arid climatic conditions. Petrographic and geochemical discriminating diagrams reveal an active margin tectonic setting for the Atrai River sediments. | ||
| 650 | 4 | |a Atrai River | |
| 650 | 4 | |a Bengal Basin | |
| 650 | 4 | |a Chemical weathering | |
| 650 | 4 | |a Provenance | |
| 650 | 4 | |a Southeastern Himalaya | |
| 650 | 4 | |a Tectonic setting | |
| 700 | 1 | |a Rokonuzzaman, Md. |4 aut | |
| 700 | 1 | |a Shahriar, Md. Shams |4 aut | |
| 700 | 1 | |a Abdullah, Rashed |4 aut | |
| 700 | 1 | |a Bari, Zahidul |4 aut | |
| 700 | 1 | |a Hossen, Md. Sazzad |4 aut | |
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