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dc.contributor.authorHashimi, N.H.
dc.contributor.authorNair, R.R.
dc.identifier.citationJournal of Indian Association of Sedimentologists, vol.8; 1989; 17-27
dc.description.abstractSeventy-five sediment samples collected from the Kerala continental shelf and slope during the 17th and 71st Cruises of RV Gaveshani were analysed by X-ray diffraction for clay mineral content. The distribution of total clay ( 4 mu fraction) indicates low percentages ( 10%) on the outer shelf and high percentages on the inner shelf (20 to 50%) and upper continental slope (11 to 47%). The clay minerals are composed of montmorillonite (smectite), kaolinite, illite and gibbsite and the non clay minerals are quartz and feldspar. Kaolinite and gibbsite have low values on the outer shelf and high values on the inner shelf and slope, while illite increases in the offshore direction. However, montmorillonite behaves differently from others in having high values on the outer shelf and low values on the inner shelf and slope. These variations in the clay mineral distribution have been attributed to differences in the energy of the various environments and due to size segregation of the minerals
dc.publisherIndian Association of Sedimentology
dc.relation.ispartofJ Indian Assoc Sedimentol
dc.relation.isbasedonProc. 5 Convention; 1985
dc.subjectGeology and Geophysics
dc.subject.othergrain size
dc.subject.otherx-ray diffraction analysis
dc.subject.othercontinental slope
dc.subject.othercontinental shelves
dc.subject.otherclay minerals
dc.subject.otherISW, India, Kerala
dc.titleClay mineral distribution on tropical shelf: an example from the western shelf of India
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India

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