Clay minerals and organic matter in shelf sediments off Coromandel Coast of India: Implications for provenance, transportation and depositional processes

Surface sediments collected from 25 stations in the Bay of Bengal were analyzed for grain size, organic matter and clay minerals to understand the spatial distribution, transport pathways, depositional process and provenance of the marine sediments. Granulometric analysis reveals the decreasing tren...

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Bibliographic Details
Published in:Continental shelf research 2020-07, Vol.198, p.104097, Article 104097
Main Authors: Anbuselvan, N., Senthil Nathan, D.
Format: Article
Language:English
Subjects:
Bay of Bengal
Clay minerals
India
Provenance
Shelf sediments
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Summary:Surface sediments collected from 25 stations in the Bay of Bengal were analyzed for grain size, organic matter and clay minerals to understand the spatial distribution, transport pathways, depositional process and provenance of the marine sediments. Granulometric analysis reveals the decreasing trend of grain size with increasing depth from coast to offshore region. The predominance of sandy sediments at shallower region represents their terrigenous origin and prevalence of high energy condition. The sediments from 50-100 m water depth are found to contain higher concentration of organic matter (TOC, TN and Sulfur) suggesting the high productivity zone. The C/N value ranges from 4 to 8 in 52% of sediments which indicates the source of both marine and terrestrial inputs. And 36% of sediment having C/N ratio
ISSN:0278-4343
1873-6955
DOI:10.1016/j.csr.2020.104097