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《Acta Sedimentologica Sinica》 2001-02
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Carbonate Dissolution Cycles during Late Quaternary in the Bay of Bengal

DING Xuan HAO Yi chun WAN Xiao qiao FANG Nian qiao (China University of Geosciences Beijing 100083)  
The Bay of Bengal is of a deep sea environment. Samples of 4 cores (MD77181, MD77183, MD77190 and MD81349) from this area were studied in detail. As a result, it is found that the carbonate content in this area was high during the interglacial interval and low during the glacial interval, and thus, shows the dilution cycles of “Atlantic Type”. The analysis of the carbonate dissolution of the 4 cores mentioned above shows the dissolution was intense in this area. Core MD77190 is nearly 3800m in depth. The preservation situation of planktonic foraminifers indicates a distinct erosion of the shell. The foraminiferal dissolution index(FDX) curve shows that in core MD77190 located place the dissolution extent is high. FDX are mostly above 5. The dissolution extent is the lowest in oxygen isotope stage 2. The dissolution extent is high in oxygen isotope stages 1, 5 and the early stage 4. Core MD81349 is located in the 90  Sea Mountain and about 2 500 m in depth. The FDX curve shows that in the MD81349 core located place the dissolution extent is relatively low and no big change. The mass accumulation rates (MAR) of planktonic foraminifers and CaCO 3 change are entirely in accordance with each other in core MD77190, both reach their highest in oxygen isotope stage 2. The MARs of both planktonic foraminifers and CaCO 3 in oxygen isotope stage 5 are lower than that in oxygen isotope stages 1, 2 and 3, and reach their lowest in oxygen isotope stage 4. The MAR curves of CaCO 3 and coarse fraction(160 μm) from cores MD77181 and MD77183 show that the MARs of CaCO 3 and coarse fraction are both the highest in oxygen isotope stage 2, the lowest in oxygen isotope stage 4 and 5. This indicates a low dissolution extent or a high productivity or both in oxygen isotope stage 2 and a high dissolution extent in oxygen isotope stages 4 and 5 in the studied area. To sum up, the dissolution in the studied area is relatively weak in oxygen isotope stage 2, but became intensified in oxygen isotope stages 4 and 5. In the studied area, the accumulated amount of CaCO 3 is low and the dissolution extent is high in oxygen isotope stages 4 and 5. The dissolution extent is low, and the accumulate amounts of CaCO 3 and planktonic foraminifers are both relatively high in oxygen isotope stage 2. This accords with the fact that CaCO 3 dissolution extent reaches its peak in the late oxygen isotope stage 5 through 4 in Indian and Pacific oceans. The fact that the CaCO 3 cycle in the Bay of Bengal was expressed as of the Atlantic type dilution cycle due to the dilution effect of terrestrial material, is actually the result of the combined effects of the Atlantic type dilution and the Pacific type dissolution.
【Fund】: 国家自然科学基金项目!(批准号 :49671 35)资助;; 中国科学院南京地质古生物研究所现代古生物学和地层学开放实验室项目!(批准号 :0 0 31
【CateGory Index】: P736.2
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