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AuthorKannaiyan, Neelavannan
AuthorHussain, S.M.
AuthorNishath, N. Mohammed
AuthorAchyuthan, Hema
AuthorVeerasingam, S.
AuthorPrakasam, Muthusamy
AuthorKumar, Pankaj
AuthorSingh, Pramod
AuthorKurian, P. John
Available date2021-05-26T18:59:29Z
Publication Date2021-05-31
Publication NameRegional Studies in Marine Science
Identifierhttp://dx.doi.org/10.1016/j.rsma.2021.101776
CitationK. Neelavannan, S.M. Hussain, N.M. Nishath et al. "Paleoproductivity shifts since the last 130 ka off Lakshadweep, Southeastern Arabian Sea". Regional Studies in Marine Science Volume 44, May 2021, 101776
ISSN23524855
URIhttps://www.sciencedirect.com/science/article/pii/S2352485521001687
URIhttp://hdl.handle.net/10576/18469
AbstractMarine sediment deposited on the ocean floor and near coastal areas, the western coastal regions of India provide records of monsoonal shifts and productivity. To understand the paleoproductivity in the northern Indian Ocean, we analyzed carbon, hydrogen, nitrogen, sulfur, total organic carbon (TOC) and calcium carbonate (CaCO3) in a deep-sea sediment core collected using gravity corer (GC-01) off Lakshadweep, Southeastern Arabian Sea. The results were then compared with the previous data generated from the surrounding area sediment cores to understand the productivity variations since the last 130 ka. The CaCO3 content in the sediment core varies from 40.82% to 62.48% (with a mean value of 51.96%) and it is noted that these values were lower during the glacial episodes (Marine Isotope Stages-2 and 4) than the interglacial episodes (MIS-1, 3 and 5). The C/N ratio varied from 0.14 to 34.25, but was less than 9, since ∼74 ka to recent, suggesting a marine origin for the organic carbon. The C/N ratio fluctuated significantly during MIS-5, and relatively the highest C/N ratio was observed at 5e ∼127, 5d ∼110 and 5b ∼85 ka, corresponding to stadials 5b and 5d, (except 5e) indicating terrestrial OC from C3 plants. The low C/N ratios during ∼128, ∼102, ∼76 and ∼32 ka match with the interstadials especially during MIS 5 (5a, 5c and 5e), correspondingly, and are marine OC in the source. This suggests that the MIS-5 stadial was interrupted via land source signifying higher productivity owing to the strong southwest monsoon during these periods. Further, high productivity was also observed during the Last Glacial Maximum (LGM) and Holocene in the Southeastern Arabian Sea since the 130 ka.
SponsorMinistry of Earth Science (MoES), Govt. of India with reference number MoES/16/07/11(i)-RDEAS and MoES/P.O.(Seismic)8(09)-Geochron/2012
Languageen
PublisherElsevier
SubjectCalcium carbonate
Organic carbon
Paleoproductivity
SW monsoon
Arabian Sea
TitlePaleoproductivity shifts since the last 130 ka off Lakshadweep, Southeastern Arabian Sea
TypeArticle
Volume Number44
dc.accessType Abstract Only


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