Controls on organic carbon distribution in sediments from the eastern Arabian Sea Margin |
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| Authors: | M Thamban V Purnachandra Rao S V Raju |
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| Institution: | (1) National Institute of Oceanography, Dona Paula 403 004, Goa, India, IN;(2) Oil India Limited, Duliajan 786 602, Assam, India, IN |
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| Abstract: | Sediment cores from the upper continental slope of the eastern Arabian Sea have high organic carbon (OC), CaCO3, and sand content at the top. The values decrease with increasing depth in the Holocene and Upper Pleistocene. Topographic
highs show highest OC and lower CaCO3 in the Holocene clayey sediments and vice versa in the Pleistocene sandy sediments. The OC is immature and marine or a mixture
of both marine and terrestrial in the Holocene sediments and is mostly terrestrial and/or reworked marine in the Pleistocene
sediments. Productivity is the main controlling factor for the organic carbon enrichment. Texture and reworking also influence
the organic carbon variations.
Received: 29 May 1996/Revision received: 10 January 1997 |
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