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Changing environmental conditions in recent past — Reading through the study of geochemical characteristics, magnetic parameters and sedimentation rate of mudflats, central west coast of India

DRS at CSIR-National Institute of Oceanography

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Title Changing environmental conditions in recent past — Reading through the study of geochemical characteristics, magnetic parameters and sedimentation rate of mudflats, central west coast of India
 
Creator Singh, K.T.
Nayak, G.N.
Fernandes, L.L.
Borole, D.V.
Basavaiah, N.
 
Subject sediment chemistry
magnetic properties
magnetic susceptibility
palaeoenvironments
mud flats
sediment properties
 
Description Geochemical (sediment components, major and trace metals), magnetic related parameters (concentration, mineralogy and grain size) and radionuclide (210Pb) analyses were carried out on sediment cores collected from mudflat regions of central west coast of India viz, Kolamb creek (Malvan), Mandovi estuary (Panaji) and Tadri creek (Gokarn), in order to study the variations in sediment characteristics with time. The changes in spatial and temporal (depth) distributions of sediment composition were observed to be mainly controlled by the catchment area geology, geomorphology and anthropogenic activities. The sedimentation rate in the study area varied from 0.13 to 2 cm/yr. The rate was extremely low at the lower half of the cores (0.13–0.31 cm/yr, before ~ 1980) as compared to the near surface (1.21–2 cm/yr, after ~ 1980) with two clear phases of sedimentation rates. The higher sedimentation rate in the upper portions of the cores was found to correspond to increased deposition of finer sediment components, metals and magnetic minerals which in turn were found to be mainly controlled by geology and/or human activities. The results of the present study reveal variations in sediment properties with time and support the use of geochemical in addition to magnetic susceptibility parameters on mudflats to understand changing environmental conditions of recent past.
 
Date 2014-03-05T10:47:05Z
2014-03-05T10:47:05Z
2014
 
Type Journal Article
 
Identifier Palaeogeography Palaeoclimatology Palaeoecology, vol.397; 2014; 61-74
http://drs.nio.org/drs/handle/2264/4475
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2013] Elsevier
 
Publisher Elsevier