Millennial- to centennial-scale record of African climate variability and organic carbon accumulation in the Coniacian–Santonian eastern tropical Atlantic (Ocean Drilling Program Site 959, off Ivory Coast and Ghana)

Research Article| February 01, 2003 Millennial- to centennial-scale record of African climate variability and organic carbon accumulation in the Coniacian–Santonian eastern tropical Atlantic (Ocean Drilling Program Site 959, off Ivory Coast and Ghana) P. Hofmann; P. Hofmann 1University of Cologne, Zülpicher Strasse 49a, 50674 Cologne, Germany Search for other works by this author on: GSW Google Scholar T. Wagner; T. Wagner 2University of Bremen, Postfach 330440, 28334 Bremen, Germany, and Woods Hole Oceanographic Institution, 360 Woods Hole Road, Woods Hole, Massachusetts 02543-1543, USA Search for other works by this author on: GSW Google Scholar B. Beckmann B. Beckmann 3University of Bremen, Postfach 330440, 28334 Bremen, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information P. Hofmann 1University of Cologne, Zülpicher Strasse 49a, 50674 Cologne, Germany T. Wagner 2University of Bremen, Postfach 330440, 28334 Bremen, Germany, and Woods Hole Oceanographic Institution, 360 Woods Hole Road, Woods Hole, Massachusetts 02543-1543, USA B. Beckmann 3University of Bremen, Postfach 330440, 28334 Bremen, Germany Publisher: Geological Society of America Received: 01 Jul 2002 Revision Received: 11 Oct 2002 Accepted: 17 Oct 2002 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2003) 31 (2): 135–138. https://doi.org/10.1130/0091-7613(2003)031<0135:MTCSRO>2.0.CO;2 Article history Received: 01 Jul 2002 Revision Received: 11 Oct 2002 Accepted: 17 Oct 2002 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation P. Hofmann, T. Wagner, B. Beckmann; Millennial- to centennial-scale record of African climate variability and organic carbon accumulation in the Coniacian–Santonian eastern tropical Atlantic (Ocean Drilling Program Site 959, off Ivory Coast and Ghana). Geology 2003;; 31 (2): 135–138. doi: https://doi.org/10.1130/0091-7613(2003)031<0135:MTCSRO>2.0.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 Millennial- to centennial-scale geochemical records of Coniacian to Santonian deposits from the Deep Ivorian Basin are used to develop a model for the accumulation of black shales in equatorial regions during the final of the Cretaceous oceanic anoxic events (OAE). Proxy records from Ocean Drilling Program Site 959 document a strong precessional signal in the occurrence of black shales, the abundance of quartz, and clay mineralogy during OAE 3. We hypothesize that this signal reflects changes in atmospheric circulation patterns, which in turn caused latitudinal shifts of continental climate belts across western Africa. Furthermore we propose that the periodic deposition of black shales occurred in response to adjustments of oceanic circulation in the Deep Ivorian Basin resulting from climate-controlled fluctuations in continental runoff. A new high-resolution cyclostratigraphic framework allowed us to estimate a rapid change—within <1000 yr—from dysoxic (background) to anoxic or euxinic (black shale) environmental conditions, followed by black shale deposition for ∼10 k.y. and a gradual return to the initial dysoxic conditions. Our findings imply a highly dynamic Late Cretaceous atmosphere-ocean system. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.