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Down core variation of texture and clay mineralogy in a sediment core (SK-72/1) from Bengal Deep Sea Fan: Implication to climate and provenance

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Title Down core variation of texture and clay mineralogy in a sediment core (SK-72/1) from Bengal Deep Sea Fan: Implication to climate and provenance
 
Creator Kumar, R Pradeep
Santhosh, S
Thrivikramaji, K P
Anirudhan, S
 
Description 24-28
Texturally,
the samples are silty-clay to clayey-silt. The clay mineral assemblage is
predominated by chlorite, followed by montmorillonite, illite and kaolinite.
Non-clay minerals are quartz and calcite. Semi-quantitative clay species
abundances on diffractograms and crystallinity indices (CI) of illite and
montmorillonite were also estimated. CI of montmorillonite reflects the

poorly crystalline nature. It
is inferred that the clays are of detrital origin most likely from the soils of
Himalayan region drained by rivers Ganges and Brahanlaputra and that a portion
of montmorillonite could be possibly sourced in the soils derived from the weathering
of flood basalts at the Deccan Plateaue of west central India and transported
by the east flowing rivers of the peninsula. However, the clay sized quartz is
of detrital origin, whereas calcite is mostly biogenic. Down core variation of
clay mineral assemblage at a depth of 40 cm indicates a shift of climate from
cold/dry to warm/humid condition during 12×103 y BP.
 
Date 2014-01-14T14:43:32Z
2014-01-14T14:43:32Z
1999-03
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/25615
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.28(1) [March 1999]