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Geochemical and diatom records of recent changes in depositional environment of a tropical wetland, central west coast of India

DRS at CSIR-National Institute of Oceanography

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Title Geochemical and diatom records of recent changes in depositional environment of a tropical wetland, central west coast of India
 
Creator Pande, A.
Nayak, G.N.
Prasad, V.
PrakashBabu, C
 
Subject Geology and Geophysics
Aquatic Non-Resources
Geochemistry
Wetlands
ISW, India
 
Description Two mudflat sediment cores collected from a sub-channel (S-61) and the main channel (S-60) of a tropical wetland, along central west coast of India, were investigated for recent changes in depositional environment using geochemical (sediment grain size, total organic carbon, total nitrogen, carbon/nitrogen ratio (TOC/TN), selected metals and pH) and diatom records The sub-channel (S-61) represents river environment which opens into main channel (S-60) which represents marine environment being close to the sea We report a transition from river-dominated to marine-dominated depositional environment over the years The relatively higher sand percentage together with elevated carbon/nitrogen ratio and predominance of freshwater diatoms suggested greater river runoff in the past while marine influence is supported by decrease in TOC/TN ratio and increased dominance of marine diatoms in recent years In the main channel (S-60), distribution of metals is regulated by organic matter (total nitrogen and total organic carbon) while in the sub-channel (S-61), Fe-Mn oxyhydroxides play a significant role in trace metal distribution The highest numbers of diatoms were recorded in the sub-channel (S-61) which is also characterized by higher total nitrogen concentration Geochemical and diatom signatures thus have helped to infer spatial and temporal variations in depositional environment.
 
Date 2016-11-03T10:59:28Z
2017-09-30T03:12:36Z
2016-11-03T10:59:28Z
2017-09-30T03:12:36Z
2015
 
Type Journal Article
 
Identifier Environmental Earth Sciences, vol.73(9); 2015; 5447-5461
1866-6280
http://drs.nio.org/drs/handle/2264/7661
 
Language en
 
Relation Environ Earth Sci
SCI
 
Publisher Springer