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Meyers, Philip A; Brassell, Simon C; Huc, Alain Y (1984): Geochemistry of organic carbon at DSDP Sites 75-530 and 75-532. PANGAEA, https://doi.org/10.1594/PANGAEA.810158, Supplement to: Meyers, PA et al. (1984): Geochemistry of organic carbon in South Atlantic sediments from Deep Sea Drilling Project Leg 75. In: Hay, WW; Sibuet, J-C; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 75, 967-981, https://doi.org/10.2973/dsdp.proc.75.129.1984

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Abstract:
CHN analyses of sediments and rocks sampled during DSDP Leg 75 in the South Atlantic have provided concentrations of organic carbon and atomic C/N ratios of organic matter from two sites. High values of organic carbon were measured in sediments deposited during Neogene and Cretaceous times at Site 530 in the Angola Basin; sediments deposited at other times contain less than 0.5% organic carbon. Development of the Benguela Current and associated upwelling-supported biological productivity is recorded in late Miocene to Holocene sediments which contain 1 to 7% organic carbon. These sediments include debris flows and turbidites composed of predominantly biogenic materials originally deposited on the Walvis Ridge and on the African continental margin. Organic-carbon-rich black shales containing up to 17% organic carbon occur in late Albian to Coniacian turbidite sequences. These Cretaceous black shale layers are commonly several centimeters thick and are separated by bioturbated fine-grained organic-carbon-poor turbidites which are usually much thicker. At Site 532 on the Walvis Ridge, biogenic sediments deposited between late Miocene and Holocene times contain 1 to 9% organic carbon. Fluctuations in the intensity of high biological productivity associated with the Benguela Current are preserved in alternating light and dark layers of sediments. C/N ratios of organic matter in sediments from both sites are typical of marine sources
Other version:
Meyers, Philip A; Dunham, Keith W (1984): (Table 1) General descriptions and organic contents at DSDP Holes 75-530B and 75-532. PANGAEA, https://doi.org/10.1594/PANGAEA.810264
Project(s):
Coverage:
Median Latitude: -19.465848 * Median Longitude: 9.952360 * South-bound Latitude: -19.744300 * West-bound Longitude: 9.385800 * North-bound Latitude: -19.187700 * East-bound Longitude: 10.518800
Date/Time Start: 1980-07-29T00:00:00 * Date/Time End: 1980-08-20T00:00:00
Event(s):
75-530 * Latitude: -19.187700 * Longitude: 9.385800 * Date/Time: 1980-07-29T00:00:00 * Elevation: -4629.0 m * Penetration: 125 m * Recovery: 9.2 m * Location: South Atlantic/RIDGE * Campaign: Leg75 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 2 cores; 11 m cored; 0 m drilled; 83.4 % recovery
75-530_Site * Latitude: -19.187700 * Longitude: 9.385933 * Date/Time: 1980-07-29T00:00:00 * Elevation: -4629.0 m * Penetration: 14.266 m * Recovery: 7.803 m * Location: South Atlantic/RIDGE * Campaign: Leg75 * Basis: Glomar Challenger * Method/Device: Composite Core (COMPCORE) * Comment: 154 cores; 1169.7 m cored; 17.9 m drilled; 66.7% recovery
75-530A * Latitude: -19.187700 * Longitude: 9.385800 * Date/Time: 1980-07-29T00:00:00 * Elevation: -4629.0 m * Penetration: 1121 m * Recovery: 617.5 m * Location: South Atlantic/RIDGE * Campaign: Leg75 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 107 cores; 986.5 m cored; 9.5 m drilled; 62.6 % recovery
Size:
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