8 research outputs found
Reading source and processes with time from mangrove sedimentary environment of Vaitarna estuary, west coast of India
1069-1081Two mangrove sediment cores collected from Vaitarna
estuary were studied for the distribution of sediment
components (sand, silt, clay and organic carbon), major
elements (iron, manganese and aluminium) and trace metals (copper, zinc,
cobalt, nickel and lead). Both the cores showed a gradual decrease in sand and
an increase in clay component from bottom to surface. This change in the type
of sediment deposited was attributed to the change in hydrodynamic energy
conditions resulting from both natural (decrease in rainfall) as well as
anthropogenic activities (construction of dams, freshwater diversion, etc.).
Metals were found to be strongly associated with sand, silt and clay, while
Fe-Mn oxyhydroxides and organic matter were found to play a minor role. They
also showed similarity in their distribution patterns, thus suggesting a common
lithogenic source. Enrichment of iron and zinc in core S5 and manganese,
copper, cobalt and lead in core S6 towards surface however suggested increase
in anthropogenic additions in recent years