New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere

Abstract

Research Article| August 01, 1999 New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere Leon J. Clarke; Leon J. Clarke 1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK Search for other works by this author on: GSW Google Scholar Hugh C. Jenkyns Hugh C. Jenkyns 1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Leon J. Clarke 1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK Hugh C. Jenkyns 1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (8): 699–702. https://doi.org/10.1130/0091-7613(1999)027<0699:NOIEFL>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Leon J. Clarke, Hugh C. Jenkyns; New oxygen isotope evidence for long-term Cretaceous climatic change in the Southern Hemisphere. Geology 1999;; 27 (8): 699–702. doi: https://doi.org/10.1130/0091-7613(1999)027<0699:NOIEFL>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract A new composite δ18O 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 δ18O 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. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.