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Lakshmi Prasad, T.
- Relationship of Heavy Mineral Redistribution in Different Microenvironments to Seasonal Changes of Beach Processes in an Embayed Beach of Yarada-Gangavaram, North Coastal Andhra Pradesh
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Authors
Affiliations
1 Department of Geology, Andhra University, Visakhapatnam - 530 003, IN
1 Department of Geology, Andhra University, Visakhapatnam - 530 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 6 (2007), Pagination: 963-974Abstract
Along and across the east coast of India between Yarada and Gangavaram, sediment samples were collected from different microenvironments of the beach representing lower foreshore, middle foreshore, upper foreshore, berm, backshore and dune, at four stations(Yarada, Dibbavanipalem, Valametta and Gangavaram) in different monsoon seasons (NE and SW) for the period of two years (1997 to 1999). All the nucroenvironments except at Dibbavanipalem have not shown cyclic deposition and erosion with monsoons Out of Four-Size ranges +60 (+0 25 mm), +120 (-0 25 to +0 125 mm), +170 (-0 125 to +0 088 mm) and +230 (-0 088 to +0 063 mm), the -0 125 to +0 088 mm and -0 088 to +0 063 mm size range shows rich concentration of heavy minerals The heavy mineral content in the bulk sediment samples ranges from 0 53 - 48 56% in December, 1997 and 0 83 - 53 22% in December, 1998 Opaques, sillimamte, garnets, pyroxenes, amphiboles, zircons, monazite, rutile, biotite, tourmaline and apatite from the beach sands of Yarada-Gangavaram are reported Opaques are concentrated in fine fraction while garnets are concentrated in coarse fraction Scatter plots of heavy mineral assemblages and erosion/accretion indicates as the rate of erosion increases, heavy mineral concentration slightly increases in dune, backshore and foreshore Sub-Environments and the concentration of heavy minerals decreases with increase of erosion in berm sub-environment. The concentration of heavy minerals in nucroenvironments is not only related to erosion/accretion but also related to their densities Khondalite, chamokite and leptynite of the Eastern Ghats appear to be the major source for the above heavy mineral assemblages.Keywords
Marine Geology, Beach Profile, Heavy Mmerals, Yarada-Gangavaram Bay, Visakhapatnam, Andhra Pradesh.
- 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.References
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