Record Details

Submerged beach ridge lineation and associated sedentary fauna in the innershelf of Gopalpur Coast, Orissa, Bay of Bengal

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Submerged beach ridge lineation and associated sedentary fauna in the innershelf of Gopalpur Coast, Orissa, Bay of Bengal
 
Creator Rao, K.M.
Murthy, K.S.R.
Reddy, N.P.C.
Subrahmanyam, A.S.
Lakshminarayana, S.
Rao, M.M.M.
Sarma, K.V.L.N.S.
Premkumar, M.K.
Sree, A.
Bapuji, M.
 
Subject continental shelf
Bay of Bengal
 
Description Detailed echosounding and side-scan sonar surveys coupled with SCUBA-diving operations in the innershelf region of Gopalpur, Orissa coast revealed the existence of a submerged NE-SW trending ridge lineation between the isobaths of 25 and 35 m. Morphology of this ridge indicates parallel to sub-parallel pinnacles with variable relief and widths. Very steep scarps in the leeward side of the seabed at many places are attributed to large-scale seabed scouring. Diving operations recovered extensive live sedentary fauna such as sponges, gorgonians, soft and hard corals along with rock encrustations from the ridge features. X-ray diffraction analysis of the rock samples revealed the mineral composition of quartz, feldspars, and low and high magnesium calcite, suggesting the morphological features to be of beach sandstone formation. High-resolution shallow seismic records indicate that the features are from the hard subsurface reflector, probably of Late Pleistocene. The composition of sedentary fauna is discussed and its association over the features is attributed to the availability of porous beach sandstone which favours growth in euphotic zone.
 
Date 2006-08-28T07:47:24Z
2006-08-28T07:47:24Z
2001
 
Type Journal Article
 
Identifier Current Science, vol.81(7), 828-833pp.
http://drs.nio.org/drs/handle/2264/273
 
Language en
 
Format 259072 bytes
application/pdf
 
Publisher Indian Academy of Sciences