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Heggie, David T (1992): Geochemistry of Cretaceous sediments from Argo and Gascoyne Abyssal Plains [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.760933, Supplement to: Heggie, DT (1992): Organic matter and paleochemistry of Cretaceous sediments from the Argo and Gascoyne Abyssal Plains, northeastern Indian Ocean. In: Gradstein, FM; Ludden, JN; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 123, 225-236, https://doi.org/10.2973/odp.proc.sr.123.169.1992

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Abstract:
The accumulation of organic matter, ferrous and pyrite iron, and the ratios of organic carbon/total sulfur and organic carbon/total phosphorus in the Lower Cretaceous sediments from the Argo and Gascoyne abyssal plains have been used as indicators of both the source and reactivity of organic matter in the sediments and the depositional environment.
Total sulfur, used as an indicator of pyrite sulfur, is more abundant in sediments from the Gascoyne Abyssal Plain than in those from the Argo Abyssal Plain. Sulfur positively correlates with TOC at both sites (although poorly at the Argo Abyssal Plain site, R = 0.48), with an extension of the line of best-fit through the origin, indicating that pyrite (TOC <2 wt%) is diagenetic and deposited from normal marine conditions. The average ratio of C/S for samples of TOC <2 wt% is 5.4 at Argo Abyssal Plain (compared to the modern normal marine value of 2.8) indicating deposition of organic matter probably of mixed terrestrial and oxidized marine sources that is unreactive to the sulfate-reducing bacteria. One sample from the Aptian sediments is rich in TOC (5.1 wt%) and has a C/S ratio of 0.5. The average C/S ratio in Gascoyne Abyssal Plain sediments is 0.8 (R = 0.97), which indicates the formation of abundant pyrite in addition to burial and preservation of relatively fresh organic matter that is reactive to the sulfate-reducing bacteria. Organic carbon to phosphorus ratios (C/P) in the sediments indicate preferential remobilization of organic carbon over phosphorus with increasing water depth.
Estimates of the degree of pyritization (DOP) increase with increasing TOC at both sites, indicating iron is not limiting and pyrite is formed diagenetically. The one sample with a TOC content of 5.1 wt%, from the Argo Abyssal Plain near the Barremian-Aptian boundary, is composed mostly of framboidal pyrite, finely laminated and not bioturbated, and hence may have been deposited during a brief period of anoxia in the overlying waters.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -17.624333 * Median Longitude: 114.608075 * South-bound Latitude: -19.932000 * West-bound Longitude: 110.454100 * North-bound Latitude: -15.976000 * East-bound Longitude: 117.575200
Date/Time Start: 1988-09-11T04:25:00 * Date/Time End: 1988-10-26T00:00:00
Event(s):
123-765C * Latitude: -15.976000 * Longitude: 117.575200 * Date/Time Start: 1988-09-11T04:25:00 * Date/Time End: 1988-09-22T10:30:00 * Elevation: -5728.0 m * Penetration: 963.9 m * Recovery: 373.35 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg123 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 65 cores; 613.7 m cored; 0 m drilled; 60.8 % recovery
123-766A * Latitude: -19.932000 * Longitude: 110.454100 * Date/Time Start: 1988-10-19T20:45:00 * Date/Time End: 1988-10-26T00:00:00 * Elevation: -4008.0 m * Penetration: 527.2 m * Recovery: 347.49 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg123 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 55 cores; 527.2 m cored; 0 m drilled; 65.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Heggie, DT (1992): (Table 1) Major element and FeO determinations of ODP Hole 123-765C. https://doi.org/10.1594/PANGAEA.760926
  2. Heggie, DT (1992): (Table 6) Mineralogy of selected color-band Aptian-Hauterivian sediments from ODP Hole 123-765C. https://doi.org/10.1594/PANGAEA.760932
  3. Heggie, DT (1992): (Table 3) TOC and diagenetic products of ODP Hole 123-765C. https://doi.org/10.1594/PANGAEA.760928
  4. Heggie, DT (1992): (Table 2) Major element and FeO determinations of ODP Hole 123-766A. https://doi.org/10.1594/PANGAEA.760927
  5. Heggie, DT (1992): (Table 4) TOC and diagenetic products of ODP Hole 123-766A. https://doi.org/10.1594/PANGAEA.760929
  6. Heggie, DT (1992): (Table 5) Average organic carbon accumulation rates in the Argo and Gascoyne abyssal plains. https://doi.org/10.1594/PANGAEA.760930