Clay mineralogy of sediments from the Bengal Fan

We have measured the relative abundances of smectite, illite, chlorite, and kaolinite in a composite section of the distal Bengal Fan. Two sources of sediment appear to dominate, a smectite-poor, illite-rich source associated with rapid denudation of the Himalayas and a smectite-rich, illite-poor source probably on the continental margin of the Indian sub-continent. Changes in source appear to be related to uplift in the Himalayas and Tibetan Plateau both directly and through the climatic and oceanographic consequences of uplift.

本研究对孟加拉远端扇复合剖面中的蒙脱石（smectite）、伊利石（illite）、绿泥石（chlorite）及高岭石（kaolinite）的相对丰度开展了测定。沉积物的主要物源有两类：其一为贫蒙脱石、富伊利石的物源，与喜马拉雅的快速剥蚀作用相关；其二为富蒙脱石、贫伊利石的物源，其大概率赋存于印度次大陆大陆边缘。物源的变化既直接与喜马拉雅及青藏高原的隆升相关，也通过隆升带来的气候与海洋学效应产生关联。