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STABLE CARBON AND OXYGEN ISOTOPIC COMPOSITION OF MIO- PLIOCENE BIVALVE SHELLS AND CALCAREOUS SEDIMENTS IN NHILA ANTICLINE, SOUTHEAST BENGAL BASIN, BANGLADESH
By: H. M. Zakir Hossain, Md. Sultan-Ul-Islam, John S. Armstrong-Altrin, Alcides N. Sial, Sabbir Ahamed, Md. Nahid Nowsher, Md. Abdullah-Al-Kawsar
Key Words: Stable isotopes, bivalve shells, calcareous sediments, Bengal Basin, Bangladesh
JLES-Vol-8-No-P-113-117, December 2013
AbstractStable carbon (δ13C) and oxygen (δ18O) isotopes of bivalve shells and calcareous sediments of the Mio-Pliocene Nhila Anticline, southeast Bengal Basin, Bangladesh have been investigated to obtain information on paleoclimate and paleoenvironment conditions during deposition. The δ13CPDB, δ18OPDB and δ18OSMOW values in bivalve shell range from -2.81‰ to -1.56‰, -3.57‰ to -2.39‰ and 27.18‰ to 28.40‰ in bivalve shells and -13.90‰ to -1.75‰, -4.71‰ to -2.13‰ and 26.01‰ to 28.66‰ in calcareous sediments, respectively. The δ13CPDB values in bivalve shells are comparable to that of calcareous sediments (~ -1.75‰) in the upper section, but δ13CPDB values in calcareous sediments are more negative excursion towards lower section (up to -13.90‰). These results signify that salinity gradients could modified the isotope values and/or strong influence of freshwater conditions. The variable δ18OPDB values in both bivalve shell and calcareous sediment suggesting diagenetic alteration of carbonates and water temperature effects. The more negative δ18OPDB values imply humid paleoclimatic conditions during the Mio- Pliocene sedimentation. Therefore, the δ18OPDB values of the Mio-Pliocene sediments of Nhila Anticline are probably controlled by paleotemperature leading to intensification of high rainfall.
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Manuscript received on 1 December 2013 and revised on 21 December 2013
H. M. Zakir Hossain, Md. Sultan-Ul-Islam, John S. Armstrong-Altrin, Alcides N. Sial, Sabbir Ahamed, Md. Nahid Nowsher, Md. Abdullah-Al-Kawsar
STABLE CARBON AND OXYGEN ISOTOPIC COMPOSITION OF MIO- PLIOCENE BIVALVE SHELLS AND CALCAREOUS SEDIMENTS IN NHILA ANTICLINE, SOUTHEAST BENGAL BASIN, BANGLADESH
JLES-Vol-8-No-P-113-117, December 2013
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