Calcium carbonate, organic carbon, δ¹³C and C/N composition of ODP Sites 186-1150 and 186-1151
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2002
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| _version_ | 1867169505936932864 |
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| author | Mora, Germán |
| author_facet | Mora, Germán |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_783546 |
| institution | PANGAEA |
| language | en |
| publishDate | 2002 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Calcium carbonate, organic carbon, δ¹³C and C/N composition of ODP Sites 186-1150 and 186-1151 Mora, Germán 186-1150A; 186-1150B; 186-1151A; DRILL; Drilling/drill rig; Joides Resolution; Leg186; North Pacific Ocean; Ocean Drilling Program; ODP 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. |
| title | Calcium carbonate, organic carbon, δ¹³C and C/N composition of ODP Sites 186-1150 and 186-1151 |
| topic | 186-1150A; 186-1150B; 186-1151A; DRILL; Drilling/drill rig; Joides Resolution; Leg186; North Pacific Ocean; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.783546 |