Abstract
X-ray diffraction analysis of twenty-three clay fractions (<2 μm) of grab samples from the northwestern part of the Bay of Bengal revealed the presence of major quantities of illite and quartz with minor amounts of montmorillonite, kaolinite and felspar. The presence of relatively high percentages of the above minerals near the Hooghly river mouth and their decrease seaward into the open Bay of Bengal lead to the belief that the sediments have been contributed mainly through the Ganges—Brahmaputra river system. The high percentages of quartz in the fine fraction indicate a detrital nature. It is also inferred from the distribution patterns of the various clay minerals in the area that the sediments move predominantly towards southeast.
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