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Shelf sediments and mineral distribution patterns off Mandapam, Palk Bay

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Title Shelf sediments and mineral distribution patterns off Mandapam, Palk Bay
 
Creator Mallik, T K
 
Description 203-208
Grain size variation and heavy minerals of offshore and beach samples have been studied. Offshore sediments consist of sand, silt clay and their admixtures, corals and algae. Most of the samples have 3 major types. Fluctuating energy condition is reflected by sorting differences. Probable sediment transport direction is towards the South and South-West. Offshore sediments have a primary mode around 1.5 to 2 φ beach samples with good concentration of black sands are polymodal and indicate mixing from multiple sediment sources. Heavy mineral assemblage suggests contribution from high and low rank metamorphic rocks and igneous rocks of the adjacent area. The area can be divided into 4 mineralogic provinces depending on the mineral assemblage: (1) eastern province characterised by sillimanite, zircon, orthopyroxene and tremolite/actinolite; (2) near coastal province with lesser amounts of hornblende, garnet, opaques, tremolite actinolite and clinopyroxene; (3) offshore province characterised by concentration of opaques and zircon; and (4) mixed province with different proportions of a number of minerals.
 
Date 2016-12-20T04:29:16Z
2016-12-20T04:29:16Z
1983
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/38894
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.12(4) [December 1983]