Geochemical data, paleo-sea surface temperatures reconstructed by TEX86 paleothermometry and time intervals differentiated based thereon at ODP Sites 207-1258 and 207-1259
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2007
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| _version_ | 1867170455671013376 |
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| author | Forster, Astrid Schouten, Stefan Baas, Marianne Sinninghe Damsté, Jaap S |
| author_facet | Forster, Astrid Schouten, Stefan Baas, Marianne Sinninghe Damsté, Jaap S |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Paleoclimate records of geologic time periods characterized by extreme global warmth such as the mid-Cretaceous are important for a better understanding of the Earth's climate system operating in an exceptionally warm mode. Here we applied an organic geochemical proxy (TEX86) on organic matter-rich Albian-Santonian sediments, recovered from Ocean Drilling Program Leg 207 Sites 1258 and 1259 on Demerara Rise, to reconstruct sea surface temperatures (SSTs) in the western equatorial Atlantic. Preceded by a stepwise Cenomanian warming trend (~31-35°C), the onset of the Cretaceous thermal maximum coincided here with the Cenomanian-Turonian boundary event. Once established, this extreme warm climate regime, characterized by averaged tropical SSTs close to 35°C, lasted up to the Turonian-Coniacian transition. Two pronounced cooler intervals (~2-3°C) interrupt this otherwise remarkably stable record, providing the first d18O independent evidence for middle Turonian cooling that previously has been attributed to glacioeustatic sea-level lowering. Coniacian SSTs decline stepwise, reaching a minimum in the Santonian (~32-33°C), where cooling is most pronounced, presumably concomitant with the first progressive opening of a deep-water passage through the equatorial Atlantic gateway. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_721812 |
| institution | PANGAEA |
| language | en |
| publishDate | 2007 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemical data, paleo-sea surface temperatures reconstructed by TEX86 paleothermometry and time intervals differentiated based thereon at ODP Sites 207-1258 and 207-1259 Forster, Astrid Schouten, Stefan Baas, Marianne Sinninghe Damsté, Jaap S 207-1258; 207-1259; COMPCORE; Composite Core; Joides Resolution; Leg207; North Atlantic Ocean; Ocean Drilling Program; ODP Paleoclimate records of geologic time periods characterized by extreme global warmth such as the mid-Cretaceous are important for a better understanding of the Earth's climate system operating in an exceptionally warm mode. Here we applied an organic geochemical proxy (TEX86) on organic matter-rich Albian-Santonian sediments, recovered from Ocean Drilling Program Leg 207 Sites 1258 and 1259 on Demerara Rise, to reconstruct sea surface temperatures (SSTs) in the western equatorial Atlantic. Preceded by a stepwise Cenomanian warming trend (~31-35°C), the onset of the Cretaceous thermal maximum coincided here with the Cenomanian-Turonian boundary event. Once established, this extreme warm climate regime, characterized by averaged tropical SSTs close to 35°C, lasted up to the Turonian-Coniacian transition. Two pronounced cooler intervals (~2-3°C) interrupt this otherwise remarkably stable record, providing the first d18O independent evidence for middle Turonian cooling that previously has been attributed to glacioeustatic sea-level lowering. Coniacian SSTs decline stepwise, reaching a minimum in the Santonian (~32-33°C), where cooling is most pronounced, presumably concomitant with the first progressive opening of a deep-water passage through the equatorial Atlantic gateway. |
| title | Geochemical data, paleo-sea surface temperatures reconstructed by TEX86 paleothermometry and time intervals differentiated based thereon at ODP Sites 207-1258 and 207-1259 |
| topic | 207-1258; 207-1259; COMPCORE; Composite Core; Joides Resolution; Leg207; North Atlantic Ocean; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.721812 |