Multi-approach Characterization of Shallow-water Carbonates off Minamitorishima and in Bengal Basin and their Depositional Settings/History

概要

Shallow-water carbonates are formed in complex depositional settings whose biota represents the source of most of the sediment. Biotic communities in shallow-water carbonates and their production vary responding to various changes in sea level, climatic and oceanographic conditions, nutrient levels, and supply of terrigenous materials. Since the carbonate production depends on such factors, it can obtain paleoenvironmental information in shallow-water that are not recorded in deep sea sediments. Therefore, shallow-water carbonates are considered one of the best research targets of and are indispensable for understanding the Earth's surface environmental system.

The shallow-water carbonates at different locations, Minamitorishima and the Bengal Basin, are investigated in this study. The Minamitorishima is located in northwestern Pacific Ocean, composed of Cretaceous volcanic edifice covered with shallow-water and pelagic carbonates. In the Bengal Basin, Eocene shallow-water carbonates were recently collected from two boreholes drill in northwestern Bangladesh. However, no detailed research has been conducted on the carbonates at Minamitorishima and in northwestern Bangladesh, and their depositional history remains unknown.

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