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Geochemistry, factor analysis and clay mineral distribution of the sediments and relationship with the associated ferromanganese nodules from the SW Carlsberg ridge

DRS at CSIR-National Institute of Oceanography

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Title Geochemistry, factor analysis and clay mineral distribution of the sediments and relationship with the associated ferromanganese nodules from the SW Carlsberg ridge
 
Creator Valsangkar, A.B.
Karisiddaiah, S.M.
Ambre, N.V.
 
Description Calcareous clay and ooze from the southwestern Carlberg Ridge show wide range of concentrations in Si (4.62-23.88%), Al (1.63-7.98%), Ti (0.43-1.70%) and CaCO sub(3) (8.50-79.75%) and reveal association of the elements with carbonate, and hydrothermal ferromanganese oxide phases. R-mode factor analysis produced 5 major factors-biological, detrital, hydrothermal and authigenic origin for the concerned sediments and further represents a transition from hydrothermal to authigenic origin. Geochemical data indicate the Cu and Ni have resulted from biogenic processes, whereas Fe, Zn and Co are from hydrothermal source. The Mn/Fe ratios (0.08-0.36 for sediments; 0.90-1.48 for nodules) and relationship of Mn with Cu, Ni and Zn for nodules and sediments suggest diagenetic supply of Mn sup(+2) through pore waters during early diagenesis. Distribution of clay minerals show that illite and smectite are more abundant than kaolinite and chlorite, whereas palygorskite and montmorillonite occur as poorly crystalline phases. Illite and chlorite are derived from Indus source due to dispersion in the southern latitudes whereas smectite and kaoklinite are authigenic and point towards the alteration of submarine volcanic rocks
 
Date 2009-05-08T11:35:02Z
2009-05-08T11:35:02Z
1992
 
Type Journal Article
 
Identifier Mahasagar, Vol.25; 83-95p.
http://drs.nio.org/drs/handle/2264/3014
 
Language en
 
Rights Copyright [1992]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Indian Association for Limnology and Oceanography