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Nature, distribution and origin of clay minerals in grain size fractions of sediments from manganese nodule field, Central Indian Ocean Basin

DRS at CSIR-National Institute of Oceanography

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Title Nature, distribution and origin of clay minerals in grain size fractions of sediments from manganese nodule field, Central Indian Ocean Basin
 
Creator Rao, V.P.
Nath, B.N.
 
Subject Geology and Geophysics
x-ray diffraction analysis
ferromanganese nodules
kaolinite
chlorite
montmorillonite
pelagic clay
sediment distribution
ISW, Central Indian Ocean
 
Description DT, IR and X-ray diffraction analyses have been carried out on 3 grain size fractions (1, 1-2 and 2-4 mu m) of sediments from the Central Indian Ocean Basin. Results indicate that there are 2 smectite minerals (montmorillonite and Fe-rich montmorillonite). Montmorillonite is present in all size fractions of sediments, whereas Fe-rich montmorillonite is present only in 1 and 1-2 mu m fractions of siliceous and 1 mu m fractions of pelagic clays. Distribution of clay minerals suggests that illite, chlorite and kaolinite are the detrital products from Ganges and Brahmaputra and montmorillonite is derived from the weathering of the ridge rocks-Fe-rich montmorillonite in siliceous and pelagic clay is a result of early diagenetic processes. Size fraction studies suggest that montmorillonite tends to crystallise in 2 mu m size range
 
Date 1995-06-24T10:01:40Z
2017-09-30T01:29:48Z
1995-06-24T10:01:40Z
2017-09-30T01:29:48Z
1988
 
Type Journal Article
 
Identifier Indian Journal of Marine Sciences, vol.17; 1988; 202-207
0379-5136
http://drs.nio.org/drs/handle/2264/7059
 
Language en
 
Relation Indian J Mar Sci
SCI
 
Publisher CSIR-NISCAIR