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Fluctuation in Glacial and Interglacial Sediment Discharge of the River Indus as Seen in a Core from the Arabian Sea

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Title Fluctuation in Glacial and Interglacial Sediment Discharge of the River Indus as Seen in a Core from the Arabian Sea
 
Creator Guptha, M V S
Hashimi, N H
 
Description 66-70
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 2016-12-16T05:59:19Z
2016-12-16T05:59:19Z
1985-06
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/38762
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.14(2) [June 1985]