Comparative organic geochemistry of Indian margin (Arabian Sea) sediments: estuary to continental slope

G. Cowie*, S. Mowbray, S. Kurian, A. Sarkar, C. White, A. Anderson, B. Vergnaud, G. Johnstone, S. Brear, C. Woulds, S. W. A. Naqvi, H. Kitazato, Gregory Cowie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Surface sediments from sites across the Indian margin of the Arabian Sea were analysed for their elemental and stable isotopic organic carbon (C-org) and total nitrogen compositions, grain size distributions and biochemical indices of organic matter (OM) source and/or degradation state. Site locations ranged from the estuaries of the Mandovi and Zuari rivers to depths of similar to 2000m on the continental slope, thus spanning nearshore muds and sands on the shelf and both the oxygen minimum zone (OMZ) on the upper slope (similar to 200-1300 m) and the seasonal hypoxic zone that appears on the shelf. Source indices showed mixed marine and terrigenous OM within the estuaries, but consistent predominance (80-100 %) of marine OM on the shelf and slope. Thus, riverine terrigenous OM is diluted or replaced by autochthonous marine OM and/or is efficiently re-mineralised, within or immediately offshore of the estuaries. Organic C contents of surface shelf sediments varied from

Original languageEnglish
Pages (from-to)6683-6696
Number of pages14
JournalBiogeosciences
Volume11
Issue number23
DOIs
Publication statusPublished - 2014

Keywords / Materials (for Non-textual outputs)

  • OXYGEN MINIMUM ZONE
  • MATTER PRESERVATION
  • ENHANCED PRESERVATION
  • AMINO-ACIDS
  • DIAGENETIC ALTERATION
  • SURFICIAL SEDIMENTS
  • COMMUNITY STRUCTURE
  • WESTERN MARGIN
  • CLAY-MINERALS
  • OMAN MARGIN

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