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• W2087755697 endingPage "428" @default.
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• W2087755697 abstract "Twenty six sandstone samples from six wells penetrating the Miocene Surma Group in the Bengal Basin, Bangladesh, were analyzed by lithium metaborate/tetraborate fusion Inductively Coupled Plasma (ICP) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and by petrographic microscope. The framework grains of the Surma Group sandstones are rich in quartz followed by lithic grains, feldspar and mica (predominantly white mica). The sandstones are dominantly quartzolithic and quartzose one in composition with abundant low-grade metamorphic, sedimentary lithics, low feldspars and little volcanic detritus, indicating that the sands were derived from a quartzose recycled orogen province. The Surma Group sandstones have moderate to high SiO2 contents (64-85%; on average 77%), TiO2 concentrations averaging 0.5%, Al2O3 contents of about 8.4%, and Fe2O3 (total Fe as Fe2O3) + MgO content of around 4.5%. Compared to the average sandstone value, the Surma Group sandstones are depleted in CaO (2.36%) and enriched in Al2O3, Fe2O3 and Na2O. Geochemically, the sandstones are classified mainly as litharenites. The Chemical Index of Alteration (CIA) values for the Miocene Surma Group sandstones vary from 53 to 65 with an average of 59, indicating low to moderate weathering of the source areas. The average CIA value (59) is a little above than that (50) of the upper continental crust. The shales from the Miocene Surma Group show higher CIA (∼70-78) values, indicating significant weathering in the source. The geochemical characteristics suggest an active continental margin to passive margin setting for the Surma Group sandstones, and preserve the signatures of a recycled provenance. The Eu/Eu* (∼0.69), (La/Lu)cn (∼10.07), La/Sc (∼3.98), Th/Sc (∼1.44), La/Co (∼3.84), Th/Co (∼1.40), and Cr/Th (∼9.48) ratios as well as chondrite-normalized REE patterns with flat HREE, LREE enrichment, and negative Eu anomalies indicate derivation of the Surma Group sandstones from felsic rock sources." @default.
• W2087755697 created "2016-06-24" @default.
• W2087755697 creator A5031133582 @default.
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• W2087755697 date "2007-01-01" @default.
• W2087755697 modified "2023-10-01" @default.
• W2087755697 title "Geochemistry of sandstones from the Miocene Surma Group, Bengal Basin, Bangladesh: Implications for Provenance, tectonic setting and wealthering" @default.
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• W2087755697 doi "https://doi.org/10.2343/geochemj.41.415" @default.
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