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Authors
Affiliations
1 Department of Geology, University of Madras, Guindy Campus, Madras - 600 025, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 4 (1997), Pagination: 399-406
Abstract
The Post Archaean Australian Shale (PAAS) normalised Rare Earth Element (REE) distribution pattern of a 4m box core from the Lower Bengal Fan clearly exhibits different types of patterns according to the climatic fluctuations of Late Quaternary period. Based on the vertical profiles of REEs, ΣLight REE/ΣHeavy REE ratio, Ce^ and ΣREE the climatic boundaries were further confirmed. The influence of continental sediments with a rugher rate of sedimentation are reflected in higher concentration of ΣREE in glacial periods. The above observations suggest the Late Pleistocene - Holocene boundary at 45-50 cm depth, the Last Glacial Maximum at 50-120cm depth and Glacial (I) stage at 150-290cm depth in the core studied. Warmer periods of Interglacial stages (II) and (I) correspond to 120-150cm and 290-400cm depths.
Keywords
Geochemistry, Rare Earth Elements, Quaternary, Bengal Fan.
