Middle Miocene oxygen minimum zone expansion offshore West Africa: Evidence for global cooling precursor events

Abstract

Research Article| August 01, 2009 Middle Miocene oxygen minimum zone expansion offshore West Africa: Evidence for global cooling precursor events S. Kender; S. Kender * 1British Geological Survey, Keyworth, Nottingham NG12 5GG, UK *E-mail: sev.kender@bgs.ac.uk. Search for other works by this author on: GSW Google Scholar V.L. Peck; V.L. Peck 2British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK Search for other works by this author on: GSW Google Scholar R.W. Jones; R.W. Jones 3BP, Chertsey Road, Sunbury-on-Thames, Middlesex TW16 7LN, UK Search for other works by this author on: GSW Google Scholar M.A. Kaminski M.A. Kaminski 4Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK Search for other works by this author on: GSW Google Scholar Geology (2009) 37 (8): 699–702. https://doi.org/10.1130/G30070A.1 Article history received: 26 Jan 2009 rev-recd: 04 Mar 2009 accepted: 23 Mar 2009 first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation S. Kender, V.L. Peck, R.W. Jones, M.A. Kaminski; Middle Miocene oxygen minimum zone expansion offshore West Africa: Evidence for global cooling precursor events. Geology 2009;; 37 (8): 699–702. doi: https://doi.org/10.1130/G30070A.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 Three dissolution events ca. 16 Ma, 15.5 Ma, and 14.3 Ma ago have been identified in sediments from the Congo Fan. Multiproxy benthic foraminiferal and sedimentary records suggest an expanded oxygen minimum zone consistent with enhanced upwelling at these times. Marine carbonate records from adjacent North Africa indicate coincident episodes of increased continental weathering, suggesting that an intermittently stronger polar front strengthened west African offshore winds, increasing surface water productivity, and enhanced North African weathering during these events. We propose that Columbia River Flood Basalt volcanism, estimated to have released 106 Tg CO2 and 106 Tg SO2 between 16 and 15.6 Ma ago, may have influenced these climatic changes. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.