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

doi:10.5194/bg-11-6683-2014

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 journal › Article › peer-review

Abstract

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 language	English
Pages (from-to)	6683-6696
Number of pages	14
Journal	Biogeosciences
Volume	11
Issue number	23
DOIs	https://doi.org/10.5194/bg-11-6683-2014
Publication status	Published - 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

Access to Document

10.5194/bg-11-6683-2014

Cowie et al 2014 bg-11-6683-2014Final published version, 3.45 MB

Organic Geochemistry Facility (OGF)
Mowbray, S. (Manager)
School of Geosciences
Facility/equipment: Facility

Gregory Cowie
- School of Geosciences - Personal Chair in/of Biogeochemistry
Person: Academic: Research Active

Cite this

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

abstract = "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",

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

author = "G. Cowie and S. Mowbray and S. Kurian and A. Sarkar and C. White and A. Anderson and B. Vergnaud and G. Johnstone and S. Brear and C. Woulds and Naqvi, {S. W. A.} and H. Kitazato and Gregory Cowie",

year = "2014",

doi = "10.5194/bg-11-6683-2014",

language = "English",

volume = "11",

pages = "6683--6696",

journal = "Biogeosciences",

issn = "1726-4170",

publisher = "Copernicus Publications",

number = "23",

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TY - JOUR

T1 - Comparative organic geochemistry of Indian margin (Arabian Sea) sediments

T2 - estuary to continental slope

AU - Cowie, G.

AU - Mowbray, S.

AU - Kurian, S.

AU - Sarkar, A.

AU - White, C.

AU - Anderson, A.

AU - Vergnaud, B.

AU - Johnstone, G.

AU - Brear, S.

AU - Woulds, C.

AU - Naqvi, S. W. A.

AU - Kitazato, H.

AU - Cowie, Gregory

PY - 2014

Y1 - 2014

N2 - 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

AB - 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

KW - OXYGEN MINIMUM ZONE

KW - MATTER PRESERVATION

KW - ENHANCED PRESERVATION

KW - AMINO-ACIDS

KW - DIAGENETIC ALTERATION

KW - SURFICIAL SEDIMENTS

KW - COMMUNITY STRUCTURE

KW - WESTERN MARGIN

KW - CLAY-MINERALS

KW - OMAN MARGIN

U2 - 10.5194/bg-11-6683-2014

DO - 10.5194/bg-11-6683-2014

M3 - Article

SN - 1726-4170

VL - 11

SP - 6683

EP - 6696

JO - Biogeosciences

JF - Biogeosciences

IS - 23

ER -

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

Abstract

Keywords / Materials (for Non-textual outputs)

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Equipment

Organic Geochemistry Facility (OGF)

Profiles

Gregory Cowie

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