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Open AccessArticle
Mineralogy and Major Element Geochemistry of the Oligocene Barail Group Sandstones from the Sylhet Trough, Bengal Basin: Provenance and Tectonic Implications
1
Department of Geological Sciences, Jahangirnagar University, Dhaka 1342, Bangladesh
2
Institute of Mining, Mineralogy and Metallurgy (IMMM), Bangladesh Council of Scientific and Industrial Research, Joypurhat 5900, Bangladesh
*
Author to whom correspondence should be addressed.
Minerals 2024, 14(10), 985; https://doi.org/10.3390/min14100985 (registering DOI)
Submission received: 17 August 2024
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Revised: 25 September 2024
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Accepted: 26 September 2024
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Published: 29 September 2024
Abstract
The origin of Oligocene sediments in the Bengal Basin and associated tectonic setting remain poorly understood. This study investigates the framework mineralogy and major element geochemistry of the Barail Group sandstones from the Sylhet Trough within the Bengal Basin to clarify the provenance and tectonic history of the Oligocene. Modal analysis (Q83F7L10) and geochemical data support a classification of sublitharenite to subarkose, some with Fe enrichment. The heavy mineral assemblage is dominated by opaque minerals, followed by ultrastable minerals with zircon > tourmaline > rutile. The sub-angular to sub-rounded sand grains with a compositionally moderate mature nature suggest that the sediments were deposited close to the source area. The mineralogical and geochemical provenance discrimination diagram suggests contributions from felsic igneous, sedimentary/metasedimentary, and low-grade metamorphic sources, with detritus derived from the Indian craton and proto-Himalaya region. Data suggest moderate to intense chemical weathering, indicative of low relief and a sub-humid to humid climate in the source area. The tectonic analyses indicate that the Bengal Basin transitioned from a predominantly passive margin to an active tectonic margin setting during the Oligocene.
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MDPI and ACS Style
Mohinta, S.; Sayem, A.S.M.; Rahman, M.J.J.; Alam, M.S.; Abdullah, R.
Mineralogy and Major Element Geochemistry of the Oligocene Barail Group Sandstones from the Sylhet Trough, Bengal Basin: Provenance and Tectonic Implications. Minerals 2024, 14, 985.
https://doi.org/10.3390/min14100985
AMA Style
Mohinta S, Sayem ASM, Rahman MJJ, Alam MS, Abdullah R.
Mineralogy and Major Element Geochemistry of the Oligocene Barail Group Sandstones from the Sylhet Trough, Bengal Basin: Provenance and Tectonic Implications. Minerals. 2024; 14(10):985.
https://doi.org/10.3390/min14100985
Chicago/Turabian Style
Mohinta, Sunjuckta, Abu Sadat Md Sayem, M. Julleh Jalalur Rahman, Md Sha Alam, and Rashed Abdullah.
2024. "Mineralogy and Major Element Geochemistry of the Oligocene Barail Group Sandstones from the Sylhet Trough, Bengal Basin: Provenance and Tectonic Implications" Minerals 14, no. 10: 985.
https://doi.org/10.3390/min14100985
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