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Angusamy, N.
- Evolution of Quaternary Sediments Along the Coast Between Vedaranyam and Rameshwaram, Tamil Nadu
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Authors
Affiliations
1 Department of Industries and Earth Sciences, Tamil University, Thanjavur - 613 005, IN
1 Department of Industries and Earth Sciences, Tamil University, Thanjavur - 613 005, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 3 (2000), Pagination: 271-283Abstract
Quaternary landforms between Vedaranyam and Rameshwaram on the east coast of India show a wide range from inland sand dune, flood plain, estuary, delta, cusp, beach, coastal dune, barrier ridge, mud flat, tidal creek to mangrove. The study area has been classified into inland, beach and offshore regions to evaluate the variation in the distribution of grain size and the depositional environments. 147 sediment samples were collected using hand augur along the beach (53) and inland (37) environments, and by Van Veen grab in the offshore area (57). Grain size analysis indicates that the area may have extended approximately 25 km towards inland from the present-day low water mark. In those days, the coast must have developed by almost similar processes as acting at present in the nearshore environment, and the sea level oscillation may have been significant in the past. Further, based on the present day rate of sedimentation, it is suggested that the study area may have developed within the last 1,50,000 years B.P.Keywords
Quaternary Sedimentation, Coastal Geomorphology, Palk Strait, Tamil Nadu.- Distribution of Heavy Minerals along the Beach from Mandapam to Kanyakumari, Tamil Nadu
Abstract Views :184 |
PDF Views:2
Authors
Affiliations
1 Department of Earth Sciences, Tamil University, Thanjavur - 613 005, IN
1 Department of Earth Sciences, Tamil University, Thanjavur - 613 005, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 2 (2000), Pagination: 199-211Abstract
Frequency distribution of heavy minerals along the southern Tamil Nadu coast from Mandapam to Kanyakumari shows selective deposition of heavies with respect to their densities. In Kanyakumari sector in the south, the heavies are concentrated in coarser sands, in the central Tuticorin sector in medium sands, and in the northern Mandapam sector in fine sands. Weight percentage distribution of heavies shows poor concentration at Mandapam that can be ascribed to strong progradational activity and wave-divergent conditions. A higher concentration of heavies in the ephemeral stream mouths in Tuticorin sector is due to the arcuate nature of the coastline, strong convergence of orthogonals and a basinal structure, all of which enable trapping of sediments carried by littoral currents. The poor concentration of heavies in Manappad sector, despite wave-convergent condition, is due to the straight alignment of the coastline without any arcuate bays. The enrichment of heavies in Kanyakumari sector is attributable to the arcuate coastiine and a downwarped basinal structure.Keywords
Heavy Minerals, Beach Sands, East Coast, Tamil Nadu.- Surface Microtextures of Quartz Grains from the Central Coast of Tamil Nadu
Abstract Views :196 |
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Authors
Affiliations
1 Alagappa Government Arts College, Karaikudi - 630 003, IN
2 Fortesque Metals Group, Perth, AU
3 National Institute of Oceanography (Council of Scientific and Industrial Research) Dona Paula - 403 004, IN
4 Sri Sairam Group of Institutions, Chennai, IN
1 Alagappa Government Arts College, Karaikudi - 630 003, IN
2 Fortesque Metals Group, Perth, AU
3 National Institute of Oceanography (Council of Scientific and Industrial Research) Dona Paula - 403 004, IN
4 Sri Sairam Group of Institutions, Chennai, IN