Unknown
PANGAEA
In:
Supplement to: Clarke, Leon J; Jenkyns, Hugh C (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
Publication Date:
2024-01-09
Description:
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.
Keywords:
122-762C; 122-763B; 123-766A; DRILL; Drilling/drill rig; Joides Resolution; Leg122; Leg123; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean
Type:
Dataset
Format:
application/zip, 3 datasets
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