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Distribution and dispersal of clay minerals on the western continental shelf of India

DRS at CSIR-National Institute of Oceanography

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Title Distribution and dispersal of clay minerals on the western continental shelf of India
 
Creator Nair, R.R.
Hashimi, N.H.
Rao, V.P.
 
Subject Geology and Geophysics
continental shelves
sediment transport
distribution
clays
ISW, India, West Coast
 
Description Sediment samples distributed over a distance of 1700 km from the inner continental shelf of western India were analysed for their clay-mineral content by X-ray diffraction. The clay minerals present in the sediments, in order of abundance, are montmorillonite, kaolinite, illite, chlorite and gibbsite,. Based on the abundance of montmorillonite and kaolinite, four clay-mineral provinces on the continental shelf have been demarcated. These are: (1) the montmorillonite-kaolinite-illite-chlorite province off the Gulf of Kutch; (2) the montmorillonite-rich zone off the Gulf of Cambay; (3) a transition zone on the central parts of the shelf; and (4) a relatively montmorillonite poor-gibbsite province on the southwestern part of the shelf. Source-rock influence on clay-mineral composition appears to be more important than physical transport - the southwest monsoon drift in the present case. In the northwestern part of the study area, the high-velocity tidal streams of the macrotidal Gulf of Kutch act as dynamic barriers to longshore sediment dispersal, leading to distinct clay-mineral assemblages on the shelf north and south of the gulf mouth
 
Date 1995-05-14T10:00:55Z
2017-09-29T13:48:39Z
1995-05-14T10:00:55Z
2017-09-29T13:48:39Z
1982
 
Type Journal Article
 
Identifier Marine Geology, vol.50; 1982; M1-M9
0025-3227
http://drs.nio.org/drs/handle/2264/6606
 
Language en
 
Relation Mar Geol
SCI
 
Publisher Elsevier