Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

B. K. Purandara ¹, V. P. Unnikrishnan ¹, C. Srinivas Gupta ¹, Y. L. Dora ¹

Affiliations
1 School of Marine Sciences, Cochin University of Science and Technology, Cochin 682016, IN

Abstract

In general most of the beach sediments from the area under study are medium sand-sized, unimodal, moderately sorted, nearly symmetrical and mesokurtic in terms of their grain-size distribution. The standard deviation shows minor variations from September to December. The heavy minerals commonly found in these sediments in the order of decreasing abundance are hornblende, opaques, hypersthene, garnet, mica, sillimanite, augite and diopside. The percentage of quartz in the light mineral fraction varies from 57% to 99%. The provenance of these beach sands is believed to be the rocks of the Western Ghats - charnockite and gneissic terrain.

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M. Samsuddin ¹, K. K. Ramachandran ¹, Y. L. Dora ²

Affiliations
1 Marine Science Division, Centre For Earth Science Studies, Trivandrum 695 031, IN
2 Nagarjuna University, Nagarjuna Nagar 522510, A.P., IN

Abstract

SEM analysis of quartz grain surfaces from the strand plain show many of the characteristic textures that are produced under sub-aqueous environments with second generation features of wind action. It is inferred that the initial stage of deposition of the strand plain sediments was associated with a wave dominated environment. With emergence of this coast, the strand plain sediments were exposed to sub-aerial action, thus registering both sub-aqueous and sub-aerial action features.

Keywords

Sedimentology, Coastal Geomotphology, Kerala Coast.

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