Organic geochemistry of Cretaceous black shales
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| Autores principales: | , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
1988
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| _version_ | 1867167664025108480 |
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| author | Dunham, Keith W Meyers, Philip A Ho, Eileen S |
| author_facet | Dunham, Keith W Meyers, Philip A Ho, Eileen S |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Organic-carbon-rich 'black shales' and adjacent organic-carbon-poor rocks from three different Cretaceous settings encountered during ODP 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 marlstone turbidites, large 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 deep-water setting created most of these examples of black shales, except for the Cenomanian-Turonian deposits in which deep-water anoxia may have been involved. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_743874 |
| institution | PANGAEA |
| language | en |
| publishDate | 1988 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Organic geochemistry of Cretaceous black shales Dunham, Keith W Meyers, Philip A Ho, Eileen S 103-637A; 103-638B; 103-638C; 103-639A; 103-639C; 103-640A; 103-641A; 103-641C; DRILL; Drilling/drill rig; Joides Resolution; Leg103; North Atlantic Ocean; Ocean Drilling Program; ODP Organic-carbon-rich 'black shales' and adjacent organic-carbon-poor rocks from three different Cretaceous settings encountered during ODP 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 marlstone turbidites, large 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 deep-water setting created most of these examples of black shales, except for the Cenomanian-Turonian deposits in which deep-water anoxia may have been involved. |
| title | Organic geochemistry of Cretaceous black shales |
| topic | 103-637A; 103-638B; 103-638C; 103-639A; 103-639C; 103-640A; 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.743874 |