2026-10-15T11:42:40Z https://oai.datacite.org/oai

doi:10.1594/pangaea.712935 2024-07-13T11:25:43Z PANGAEA PANGAEA.REPOSITORY

Isotope oxygen record for ODP sediments from the Exmouth Plateau Clarke, Leon J Jenkyns, Hugh C PANGAEA 1999 Issued: 1999 doi:10.1130/0091-7613(1999)027<0699:noiefl>2.3.co;2 url:ftp://rock.geosociety.org/pub/reposit/1999/9957.pdf Drilling/drill rig Leg122 Leg123 Joides Resolution Ocean Drilling Program (ODP) 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. 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 en Collection Supplementary Publication Series of Datasets application/zip Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode