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Littke, Ralf; Rullkötter, Jürgen; Schaefer, Rainer G (1991): Organic carbon geochemistry of ODP Leg 121 samples. PANGAEA, https://doi.org/10.1594/PANGAEA.759143, Supplement to: Littke, R et al. (1991): Organic and carbonate carbon accumulation on Broken Ridge and Ninetyeast Ridge, Central Indian Ocean. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 467-487, https://doi.org/10.2973/odp.proc.sr.121.129.1991

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Abstract:
Organic petrological and geochemical analyses were performed on samples cored on Broken Ridge and Ninetyeast Ridge in the Central Indian Ocean during Leg 121. Organic carbon (Corg) contents are less than 1% in each individual sample and average Corg values calculated for larger stratigraphic units are less than 0.2%. Generally, there is more organic matter in Cretaceous sediments than in Tertiary. In the Cretaceous, the bulk of the organic matter consists of terrigenous debris, but a significant contribution of marine-derived organic matter was found in some samples, especially in the early Maestrichtian on Broken Ridge (Site 754). The youngest Pliocene-Pleistocene sediments at Site 758 (northern part of Ninetyeast Ridge) contain a significant amount of clastic material transported to the site by the (distal) Bengal Fan. In these sediments, Corg contents of up to 0.9% were measured and are due to the inflow of terrigenous organic debris. Corg values are positively correlated with bulk sediment accumulation rates (i.e., sediments contain more organic matter at times of faster deposition). The size of terrigenous organic particles is generally small in all sediments. The extremely small number of particles in the Cretaceous sediments at Site 758 and their smaller grain size, compared to the Cretaceous sediments on Broken Ridge, indicate that Cretaceous surface water paleocurrents flowed from southeast to northwest in the Proto-Indian Ocean.
In the central Indian Ocean, sediments deposited above the carbonate compensation depth consist of nannofossil and foraminiferal oozes. In contrast to Corg values, calcite contents in the sediments are negatively correlated with bulk sediment accumulation rates (i.e., carbonate oozes were deposited only during times of extremely slow sedimentation). Therefore, older sediments deposited in the young and still narrow Indian Ocean accumulated faster and are less carbonate-rich than Neogene sediments, although carbonate accumulation rates were higher.
Project(s):
Coverage:
Median Latitude: -14.012973 * Median Longitude: 92.065413 * South-bound Latitude: -31.030000 * West-bound Longitude: 90.361200 * North-bound Latitude: 5.384200 * East-bound Longitude: 93.566500
Date/Time Start: 1988-05-15T05:15:00 * Date/Time End: 1988-06-24T13:30:00
Event(s):
121-754B * Latitude: -30.941000 * Longitude: 93.566500 * Date/Time Start: 1988-05-15T05:15:00 * Date/Time End: 1988-05-18T05:40:00 * Elevation: -1076.0 m * Penetration: 354.7 m * Recovery: 91.85 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 24 cores; 232 m cored; 0 m drilled; 39.6 % recovery
121-755A * Latitude: -31.030000 * Longitude: 93.546700 * Date/Time Start: 1988-05-22T15:00:00 * Date/Time End: 1988-05-24T07:30:00 * Elevation: -1069.0 m * Penetration: 208.4 m * Recovery: 80.21 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 178.4 m cored; 0 m drilled; 45 % recovery
121-758A * Latitude: 5.384200 * Longitude: 90.361200 * Date/Time Start: 1988-06-15T23:50:00 * Date/Time End: 1988-06-24T13:30:00 * Elevation: -2935.0 m * Penetration: 676.8 m * Recovery: 453.83 m * Location: Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 73 cores; 676.8 m cored; 0 m drilled; 67.1 % recovery
Size:
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