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Lime muds and their genesis off-Northwestern India during the late Quaternary

DRS at CSIR-National Institute of Oceanography

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Title Lime muds and their genesis off-Northwestern India during the late Quaternary
 
Creator Rao, V.P.
AnilKumar, A.
Naqvi, S.W.A.
Chivas, A.R.
Sekar, B.
Kessarkar, P.M.
 
Subject sediments
core analysis
sea level changes
climatic changes
 
Description Two sediment types were found in five gravity cores collected from water depths between 56 m and 121 m along the northwestern continental margin of India. lime mud was abundant in the lower section while siliciclastic sediments dominated the upper section. Lime mud-dominated sediments in shelf cores contained 60% - 75% carbonate, 0.3% - 0.6% Sr and terrigenous minerals, whereas those at the shelf break were found to have more than 90% carbonate, 0.6% - 0.8% Sr and traces of terrigenous minerals. Aragonite needles showing blunt edges, jointed needles and needles wrapped in smooth aragonite cement were found to be common. Stable (O and C) isotopes of lime mud indicate a potentially freshwater contribution for shelf cores and purely marine contribution for those at the shelf break. Calibrated radiocarbon ages of the lime mud ranged from 17.6 - 11.9 ka in different cores. The results reported here suggest that the lime muds in the shallow shelf are probably reworked from the Gulf of Kachchh, whereas those at the shelf break were biodetrital, initially formed on the carbonate platform during low stands of sea level and then exported. The change in lime mud-dominated to siliciclastic-dominated sediments in the cores may be due to climate change and rapid rise in sea level during the early Holocene.
 
Date 2012-07-27T09:02:14Z
2012-07-27T09:02:14Z
2012
 
Type Journal Article
 
Identifier Journal of Earth System Science, vol.121(3); 2012; 769-779
http://drs.nio.org/drs/handle/2264/4098
 
Language en
 
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Publisher Indian Academy of Sciences