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Veeranarayana, B.
- Distribution of Heavy Minerals in Nizampatnam-Lankavanidibba Coastal Sands, Andhra Pradesh, East Coast of India
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Authors
Affiliations
1 Department of Geology, Andhra University, Visakhapatnam - 530 003, IN
2 Department of Earth Sciences, Yogi Vemana University, Kadapa - 516 001, IN
1 Department of Geology, Andhra University, Visakhapatnam - 530 003, IN
2 Department of Earth Sciences, Yogi Vemana University, Kadapa - 516 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 4 (2012), Pagination: 411-418Abstract
Heavy mineral analysis was carried out for the beach and fore dune sediments along 60 transects of Nizampatnam-Lankavanidibba coastal area. The heavy mineral assemblage in this area with decreasing abundance of opaques (Ilmenite + magnetite, 47.67%), pyriboles (20.35%), garnets (3.66%), epidote (3.23%) and with less than 3.0% concentration of sillimanite, zircon, staurolite, kyanite, apatite, spinel, monazite, biotite, topaz, leucoxene and chlorite. The heavy mineral concentrations are high in the finer fractions i.e., +120 and +230 (ASTM) than the coarse fraction (+60) of sand. In the seven sectors, heavy mineral assemblage is same but their concentrations are different. The sectors nearer to the river mouth contain high concentration of high specific gravity heavy minerals (ilmenite and magnetite) than sectors away from the river mouth. The redistribution of heavy minerals is controlled by creek dynamics, longshore currents, size and specific gravity of the heavy minerals.Keywords
Heavy Minerals, Coastal Sands, Longshore Currents, Tidal Channels.
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