A stable and hot Turonian without glacial δ18O excursions is indicated by exquisitely preserved Tanzanian foraminifera

Research Article| October 01, 2013 A stable and hot Turonian without glacial δ18O excursions is indicated by exquisitely preserved Tanzanian foraminifera Kenneth G. MacLeod; Kenneth G. MacLeod * 1Department of Geological Sciences, University of Missouri, Columbia, Missouri 65211, USA *E-mail: MacLeodK@missouri.edu. Search for other works by this author on: GSW Google Scholar Brian T. Huber; Brian T. Huber 2Department of Paleobiology, MRC 121, Smithsonian Museum of Natural History, Washington, D.C. 20013, USA Search for other works by this author on: GSW Google Scholar Álvaro Jiménez Berrocoso; Álvaro Jiménez Berrocoso 3Repsol Exploration S.A., Méndez Álvaro 44, Madrid 28045, Spain Search for other works by this author on: GSW Google Scholar Ines Wendler Ines Wendler 4Department of Geological Sciences, University of Bremen, P.O. Box 330 440, D-28334 Bremen, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Kenneth G. MacLeod * 1Department of Geological Sciences, University of Missouri, Columbia, Missouri 65211, USA Brian T. Huber 2Department of Paleobiology, MRC 121, Smithsonian Museum of Natural History, Washington, D.C. 20013, USA Álvaro Jiménez Berrocoso 3Repsol Exploration S.A., Méndez Álvaro 44, Madrid 28045, Spain Ines Wendler 4Department of Geological Sciences, University of Bremen, P.O. Box 330 440, D-28334 Bremen, Germany *E-mail: MacLeodK@missouri.edu. Publisher: Geological Society of America Received: 22 Feb 2013 Revision Received: 02 Jun 2013 Accepted: 05 Jun 2013 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2013 Geological Society of America Geology (2013) 41 (10): 1083–1086. https://doi.org/10.1130/G34510.1 Article history Received: 22 Feb 2013 Revision Received: 02 Jun 2013 Accepted: 05 Jun 2013 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Kenneth G. MacLeod, Brian T. Huber, Álvaro Jiménez Berrocoso, Ines Wendler; A stable and hot Turonian without glacial δ18O excursions is indicated by exquisitely preserved Tanzanian foraminifera. Geology 2013;; 41 (10): 1083–1086. doi: https://doi.org/10.1130/G34510.1 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 shift from the icehouse climate in which humans evolved to a Late Cretaceous–like greenhouse climate is an often-repeated cautionary prediction of the consequences of continued anthropogenic CO2 emissions. The corollary, that understanding the past might help predict the future, has justified many Late Cretaceous studies, but important questions remain about climate stability and sensitivity. New δ18O measurements of more than 1000 samples of exceptionally well preserved foraminifera (8 planktic and 11 benthic taxa) from two sites in Tanzania indicate that hot and remarkably stable conditions prevailed in the region during the Turonian, including during a proposed greenhouse glacial event. Planktic taxa have δ18O values largely between –4.0‰ and –5.0‰, suggesting surface-water temperatures between 30 and 35 °C. Estimates for seafloor temperatures are between 18 and 25 °C. No parallel shifts in δ18O values are observed among planktic and benthic taxa, contradicting an often-cited line of evidence for greenhouse glaciations and supporting an effectively ice-free Turonian world. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.