Record Details

Fluctuation in glacial and interglacial sediment discharge of the River Indus as seen in the core from the Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Fluctuation in glacial and interglacial sediment discharge of the River Indus as seen in the core from the Arabian Sea
 
Creator Guptha, M.V.S.
Hashimi, N.H.
 
Subject Geology and Geophysics
river valleys
ice ages
interglacial periods
calcium carbonates
core analysis
sediments
ISW, Arabian Sea
 
Description Sediment core from the upper continental slope off Saurashtra Coast has been analysed for CaCO sub(3) and coarse fraction contents in addition to planktonic foraminifera and clay mineralogy. Based on CaCO sub(3) and planktonic foraminiferal data a boundary between glacial and interglacial is placed at 42 cm assuming the sedimentation rate as 4 cm 1000 y/1. Distribution of CaCO sub(3) clearly shows the sharp change in its abundance at the 42 cm boundary. Among planktonic foraminifera, Globigerinoides sacculifer and G. ruber are by far the most abundant. Variation in the planktonic foraminiferal fauna is not as sharp as CaCO sub(3), because of the insignificant change in the temperature during glacial and interglacial periods of late Pleistocene. Some species of Orbulina, viz. Orbulina bilobata and O. suturalis are encountered and believed to be reworked ones. Distribution of clay minerals such as kaolinite, illite and chlorite along with quartz shows and increasing trend towards the bottom of the core in the glacial period. This may reflect the fluctuation in the sediment discharge from the river Indus, whereas, in the interglacial period this is not encountered and may be attributed to the existence of dynamic barrier in Holocene
 
Date 1995-05-19T10:01:08Z
2017-09-29T13:48:24Z
1995-05-19T10:01:08Z
2017-09-29T13:48:24Z
1985
 
Type Journal Article
 
Identifier Indian Journal of Marine Sciences, vol.14; 1985; 66-70
0379-5136
http://drs.nio.org/drs/handle/2264/6320
 
Language en
 
Relation Indian J Mar Sci
SCI
 
Publisher CSIR-NISCAIR