Organic geochemistry of Cretaceous black shales from the Galicia Margin
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
1987
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| _version_ | 1867170459369340928 |
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| author | Meyers, Philip A Dunham, Keith W Ho, Eileen S |
| author_facet | Meyers, Philip A Dunham, Keith W Ho, Eileen S |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Organic-carbon-rich "black shales" from three different Cretaceous episodes sampled during Ocean Drilling Program Leg 103 have been studied by organic geochemical methods. Rock-Eval analysis, carbon isotope data, and lipid biomarkers show organic matter to contain varying proportions of marine and continental materials. In Hauterivian-Barremian organic-carbon-rich turbiditic marlstones, major amounts of land-derived organic matter are found. Aptian-Albian black-colored shales are interspersed within green claystones, from which they differ by containing more marine organic matter. An abbreviated layer of black shale from the Cenomanian-Turonian boundary is dominated by well-preserved marine organic matter. Downslope transport and rapid reburial within a predominantly oxygenated deepwater setting created most of these examples of black shales, except for the Cenomanian-Turonian deposits in which deepwater anoxia may have been involved. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_757260 |
| institution | PANGAEA |
| language | en |
| publishDate | 1987 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Organic geochemistry of Cretaceous black shales from the Galicia Margin Meyers, Philip A Dunham, Keith W Ho, Eileen S 103-638B; 103-641A; 103-641C; DRILL; Drilling/drill rig; Joides Resolution; Leg103; North Atlantic Ocean; Ocean Drilling Program; ODP Organic-carbon-rich "black shales" from three different Cretaceous episodes sampled during Ocean Drilling Program Leg 103 have been studied by organic geochemical methods. Rock-Eval analysis, carbon isotope data, and lipid biomarkers show organic matter to contain varying proportions of marine and continental materials. In Hauterivian-Barremian organic-carbon-rich turbiditic marlstones, major amounts of land-derived organic matter are found. Aptian-Albian black-colored shales are interspersed within green claystones, from which they differ by containing more marine organic matter. An abbreviated layer of black shale from the Cenomanian-Turonian boundary is dominated by well-preserved marine organic matter. Downslope transport and rapid reburial within a predominantly oxygenated deepwater setting created most of these examples of black shales, except for the Cenomanian-Turonian deposits in which deepwater anoxia may have been involved. |
| title | Organic geochemistry of Cretaceous black shales from the Galicia Margin |
| topic | 103-638B; 103-641A; 103-641C; DRILL; Drilling/drill rig; Joides Resolution; Leg103; North Atlantic Ocean; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.757260 |