Mora, Germán (2002): Calcium carbonate, organic carbon, δ¹³C and C/N composition of ODP Sites 186-1150 and 186-1151 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.783546, Supplement to: Mora, G (2002): Variations in the accumulation of marine organic matter and carbonates at Leg 186 sites. In: Suyehiro, K; Sacks, IS; Acton, GD; Oda, M (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 186, 1-17, https://doi.org/10.2973/odp.proc.sr.186.103.2002
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Abstract:
Past changes in sea-surface productivity in the Oyashio Current are evaluated on the basis of abundances of biological constituents in sediments from Leg 186 sites. Organic carbon contents at Sites 1150 and 1151 are moderate (0.5 to 1.5 wt%) and have an algal origin as indicated by low C/N ratios (<10) and by carbon isotopic compositions ranging from -23.4 to -21.3. A decreasing trend in organic carbon contents, carbon isotope ratios, and C/N ratios occurs with depth at both sites, probably as a consequence of diagenetic degradation of organic matter. Mass accumulation rates (MARs) determined for organic carbon and carbonates at Sites 1150 and 1151 show an abrupt increase between ~5 and 7 Ma. Similar results have been reported for sites in the Indian Ocean and the Pacific Ocean for the same time interval. As it has been previously suggested, the observed increase in MAR for both carbonate and organic carbon at Leg 186 sites probably resulted from augmented nutrient supply either from continental sources or from a more vigorous ocean circulation.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 38.966943 * Median Longitude: 143.333290 * South-bound Latitude: 38.751980 * West-bound Longitude: 143.331910 * North-bound Latitude: 39.181910 * East-bound Longitude: 143.334400
Date/Time Start: 1999-06-22T18:30:00 * Date/Time End: 1999-08-02T17:45:00
Event(s):
186-1150A * Latitude: 39.181910 * Longitude: 143.331910 * Date/Time Start: 1999-06-22T18:30:00 * Date/Time End: 1999-06-26T22:15:00 * Elevation: -2680.8 m * Penetration: 722.6 m * Recovery: 566.4 m * Location: North Pacific Ocean * Campaign: Leg186 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 76 cores; 722.6 m cored; 0 m drilled; 78.4 % recovery
186-1150B * Latitude: 39.181900 * Longitude: 143.332450 * Date/Time Start: 1999-06-26T22:15:00 * Date/Time End: 1999-07-03T13:30:00 * Elevation: -2680.8 m * Penetration: 1181.6 m * Recovery: 269.29 m * Location: North Pacific Ocean * Campaign: Leg186 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 50 cores; 478.3 m cored; 703.3 m drilled; 56.3 % recovery
186-1151A * Latitude: 38.751980 * Longitude: 143.334400 * Date/Time Start: 1999-07-28T22:00:00 * Date/Time End: 1999-08-02T17:45:00 * Elevation: -2182.2 m * Penetration: 1113.6 m * Recovery: 707.6 m * Location: North Pacific Ocean * Campaign: Leg186 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 108 cores; 1035.6 m cored; 0 m drilled; 68.3 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Mora, G (2002): (Table T1) Calcium carbonate, organic carbon and δ¹³C concentration in ODP Site 186-1150 sediments. https://doi.org/10.1594/PANGAEA.783544
- Mora, G (2002): (Table T2) Calcium carbonate, C/N and organic carbon content in ODP Hole 186-1151A sediments. https://doi.org/10.1594/PANGAEA.783545