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Clarke, Leon J; Jenkyns, Hugh C (1999): Isotope oxygen record for ODP sediments from the Exmouth Plateau. PANGAEA, https://doi.org/10.1594/PANGAEA.712935, Supplement to: Clarke, LJ; Jenkyns, HC (1999): New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere. Geology, 27(8), 699-702, https://doi.org/10.1130/0091-7613(1999)027%3C0699:NOIEFL%3E2.3.CO;2

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Abstract:
A new composite d18O record, generated from calcareous fine-fraction and bulk sediments from the Exmouth Plateau, details long-term Cretaceous climatic change at mid-latitudes in the Southern Hemisphere. Assessment of new and previously published d18O data indicates that a mid-Cretaceous global climatic optimum was achieved sometime between the time of the Cenomanian-Turonian boundary and the middle Turonian, when surface-ocean paleotemperatures were the highest of the past 115 m.y. Periods of cooling and warming that reversed the general patterns were superimposed on long-term Aptian-Turonian warming and Turonian-Maastrichtian cooling trends, respectively. Extrapolation of Southern Hemisphere paleotemperature trends to Maastrichtian paleotemperature data from a low-latitude Pacific guyot implies that maximum mid-Cretaceous low-latitude paleotemperatures could have been in excess of 33°C.
Project(s):
Coverage:
Median Latitude: -20.135333 * Median Longitude: 111.638933 * South-bound Latitude: -20.587000 * West-bound Longitude: 110.454100 * North-bound Latitude: -19.887000 * East-bound Longitude: 112.254000
Date/Time Start: 1988-07-27T03:25:00 * Date/Time End: 1988-10-26T00:00:00
Event(s):
122-762C * Latitude: -19.887000 * Longitude: 112.254000 * Date/Time Start: 1988-07-27T03:25:00 * Date/Time End: 1988-08-05T08:30:00 * Elevation: -1371.0 m * Penetration: 940 m * Recovery: 534.54 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg122 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 91 core; 940 m cored; 0 m drilled; 56.9 % recovery
122-763B * Latitude: -20.587000 * Longitude: 112.208700 * Date/Time Start: 1988-08-06T07:30:00 * Date/Time End: 1988-08-11T21:00:00 * Elevation: -1379.0 m * Penetration: 653.5 m * Recovery: 376.36 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg122 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 54 cores; 653.5 m cored; 0 m drilled; 57.6 % recovery
123-766A * Latitude: -19.932000 * Longitude: 110.454100 * Date/Time Start: 1988-10-19T20:45:00 * Date/Time End: 1988-10-26T00:00:00 * Elevation: -4008.0 m * Penetration: 527.2 m * Recovery: 347.49 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg123 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 55 cores; 527.2 m cored; 0 m drilled; 65.9 % recovery
Size:
3 datasets

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