Forster, Astrid; Schouten, Stefan; Baas, Marianne; Sinninghe Damsté, Jaap S (2007): Geochemical data, paleo-sea surface temperatures reconstructed by TEX86 paleothermometry and time intervals differentiated based thereon at ODP Sites 207-1258 and 207-1259 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.721812, Supplement to: Forster, A et al. (2007): Mid-Cretaceous (Albian-Santonian) sea surface temperature record of the tropical Atlantic Ocean. Geology, 35(10), 919-922, https://doi.org/10.1130/G23874A.1
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Abstract:
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.
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Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 9.366867 * Median Longitude: -54.466283 * South-bound Latitude: 9.300400 * West-bound Longitude: -54.733050 * North-bound Latitude: 9.433333 * East-bound Longitude: -54.199517
Date/Time Start: 2003-01-22T00:00:00 * Date/Time End: 2003-02-16T00:00:00
Event(s):
207-1258 * Latitude: 9.433333 * Longitude: -54.733050 * Date/Time Start: 2003-01-22T00:00:00 * Date/Time End: 2003-02-01T00:00:00 * Elevation: -3192.2 m * Penetration: 1393.4 m * Recovery: 882.7 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 141 cores; 1116.6 m cored; 276.8 m drilled; 79 % recovery
207-1259 * Latitude: 9.300400 * Longitude: -54.199517 * Date/Time Start: 2003-02-01T00:00:00 * Date/Time End: 2003-02-16T00:00:00 * Elevation: -2354.5 m * Penetration: 1668.7 m * Recovery: 644.9 m * Location: South Atlantic Ocean * Campaign: Leg207 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 104 cores; 929.6 m cored; 739.1 m drilled; 69.4 % 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
- Forster, A; Schouten, S; Baas, M et al. (2007): (Table DR1) Geochemical data, paleo-sea surface temperatures reconstructed by TEX86 paleothermometry and time intervals differentiated based thereon at ODP Site 207-1258. https://doi.org/10.1594/PANGAEA.721810
- Forster, A; Schouten, S; Baas, M et al. (2007): (Table DR2) Geochemical data, paleo-sea surface temperatures reconstructed by TEX86 paleothermometry and time intervals differentiated based thereon at ODP Site 207-1259. https://doi.org/10.1594/PANGAEA.721811