Geochemical characterization of miocene core sediments from Shahbazpur gas-wells (Bangladesh) in terms of elemental abundances by instrumental neutron activation analysis.

Geochemical characterization of Shahbazpur structure (Bengal Foredeep) in terms of elemental abundances obtained from INAA are presented by investigating core samples from Shabazpur gas-field, Bangladesh. Major oxides' abundances were 12.4–20.8, 0.63–1.03, 4.45–8.02, 0.05–0.09, 2.60–4.10 and 1.31–1.87% for Al₂O₃, TiO₂, Fe₂O₃(T), MnO, K₂O and Na₂O, respectively. Elemental ratios and enrichment pattern (× 1.10–2.11 UCC) indicate that sedimentary processes originated from Himalayan felsic source-rock. Weathering index and Th/U(= 5.90–6.59), V/Cr(= 1.07–1.38) ratios revel that sediments/rocks were experienced moderate to high degree of chemical weathering with oxidizing environment. La-Th-Sc immobile trace elements diagram invoke depositional tectonic settings which was transitional between active and passive continental margin. [ABSTRACT FROM AUTHOR]