Bathymetric and isotopic evidence for a short-lived Late Ordovician glaciation in a greenhouse period

Abstract

Research Article| April 01, 1994 Bathymetric and isotopic evidence for a short-lived Late Ordovician glaciation in a greenhouse period P. J. Brenchley; P. J. Brenchley 1Department of Earth Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom Search for other works by this author on: GSW Google Scholar J. D. Marshall; J. D. Marshall 1Department of Earth Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom Search for other works by this author on: GSW Google Scholar G. A. F. Carden; G. A. F. Carden 1Department of Earth Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom Search for other works by this author on: GSW Google Scholar D. B. R. Robertson; D. B. R. Robertson 1Department of Earth Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom Search for other works by this author on: GSW Google Scholar D. G. F. Long; D. G. F. Long 2Department of Geology, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada Search for other works by this author on: GSW Google Scholar T. Meidla; T. Meidla 3Institute of Geology, Tartu University, Tartu, EE2400, Estonia Search for other works by this author on: GSW Google Scholar L. Hints; L. Hints 4Institute of Geology, Academy of Sciences, Tallinn, EE0105 Estonia Search for other works by this author on: GSW Google Scholar T. F. Anderson T. F. Anderson 5Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 Search for other works by this author on: GSW Google Scholar Author and Article Information P. J. Brenchley 1Department of Earth Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom J. D. Marshall 1Department of Earth Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom G. A. F. Carden 1Department of Earth Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom D. B. R. Robertson 1Department of Earth Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom D. G. F. Long 2Department of Geology, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada T. Meidla 3Institute of Geology, Tartu University, Tartu, EE2400, Estonia L. Hints 4Institute of Geology, Academy of Sciences, Tallinn, EE0105 Estonia T. F. Anderson 5Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1994) 22 (4): 295–298. https://doi.org/10.1130/0091-7613(1994)022<0295:BAIEFA>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 P. J. Brenchley, J. D. Marshall, G. A. F. Carden, D. B. R. Robertson, D. G. F. Long, T. Meidla, L. Hints, T. F. Anderson; Bathymetric and isotopic evidence for a short-lived Late Ordovician glaciation in a greenhouse period. Geology 1994;; 22 (4): 295–298. doi: https://doi.org/10.1130/0091-7613(1994)022<0295:BAIEFA>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 The end Ordovician glaciation is distinct among Phanerozoic glaciations in that CO2, levels were generally high, yet major continental ice sheets accumulated on the Gondwana supercontinent. New oxygen isotopic data indicate substantial changes in sea-water temperatures and ice volume coinciding with glacio-eustatic changes in sea level reflecting the growth and decay of the Gondwana ice cap. Major glaciation was apparently confined to the Hirnantian and was 0.5-1 m.y. long, rather than the 35 m.y. of earlier estimates. Carbon isotope values indicate significant changes in carbon cycling as the oceans changed from a state with warm saline bottom waters to a state with cold deep-water circulation and then back again. We believe that the changes in the carbon cycle effected a reduction in PCO2 levels in the oceans and atmosphere and thus promoted glaciation but were unable to sustain icehouse conditions in a greenhouse world. 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.