Portal de Periódicos da CAPES

Complete archive of late Turonian to early Campanian sedimentary deposition in newly drilled cores from the Tarfaya Basin, SW Morocco

2016; Geological Society of America; Volume: 129; Issue: 1-2 Linguagem: Inglês

10.1130/b31523.1

1943-2674

Mohamed Aquit, Wolfgang Kuhnt, Ann Holbourn, El Hassane Chellaı̈, Jackie A. Lees, Oliver Kluth, Haddou Jabour,

Geochemistry and Elemental Analysis

Research Article| January 01, 2017 Complete archive of late Turonian to early Campanian sedimentary deposition in newly drilled cores from the Tarfaya Basin, SW Morocco Mohamed Aquit; Mohamed Aquit 1Institute of Geosciences, Christian-Albrechts-University of Kiel, 24118 Kiel, Germany Search for other works by this author on: GSW Google Scholar Wolfgang Kuhnt; Wolfgang Kuhnt † 1Institute of Geosciences, Christian-Albrechts-University of Kiel, 24118 Kiel, Germany †wk@gpi.uni-kiel.de Search for other works by this author on: GSW Google Scholar Ann Holbourn; Ann Holbourn 1Institute of Geosciences, Christian-Albrechts-University of Kiel, 24118 Kiel, Germany Search for other works by this author on: GSW Google Scholar El Hassane Chellai; El Hassane Chellai 2Geology Department, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco Search for other works by this author on: GSW Google Scholar Jacqueline A. Lees; Jacqueline A. Lees 3Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK Search for other works by this author on: GSW Google Scholar Oliver Kluth; Oliver Kluth 4DEA Deutsche Erdoel AG, 22297 Hamburg, Germany Search for other works by this author on: GSW Google Scholar Haddou Jabour Haddou Jabour 5Office National des Hydrocarbures et des Mines (ONHYM), Rabat, Morocco Search for other works by this author on: GSW Google Scholar Author and Article Information Mohamed Aquit 1Institute of Geosciences, Christian-Albrechts-University of Kiel, 24118 Kiel, Germany Wolfgang Kuhnt † 1Institute of Geosciences, Christian-Albrechts-University of Kiel, 24118 Kiel, Germany Ann Holbourn 1Institute of Geosciences, Christian-Albrechts-University of Kiel, 24118 Kiel, Germany El Hassane Chellai 2Geology Department, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco Jacqueline A. Lees 3Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK Oliver Kluth 4DEA Deutsche Erdoel AG, 22297 Hamburg, Germany Haddou Jabour 5Office National des Hydrocarbures et des Mines (ONHYM), Rabat, Morocco †wk@gpi.uni-kiel.de Publisher: Geological Society of America Received: 27 Feb 2016 Revision Received: 13 Jun 2016 Accepted: 13 Jul 2016 First Online: 02 Jun 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2016 Geological Society of America GSA Bulletin (2017) 129 (1-2): 137–151. https://doi.org/10.1130/B31523.1 Article history Received: 27 Feb 2016 Revision Received: 13 Jun 2016 Accepted: 13 Jul 2016 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 Mohamed Aquit, Wolfgang Kuhnt, Ann Holbourn, El Hassane Chellai, Jacqueline A. Lees, Oliver Kluth, Haddou Jabour; Complete archive of late Turonian to early Campanian sedimentary deposition in newly drilled cores from the Tarfaya Basin, SW Morocco. GSA Bulletin 2017;; 129 (1-2): 137–151. doi: https://doi.org/10.1130/B31523.1 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 SocietyGSA Bulletin Search Advanced Search Abstract An expanded succession of organic-rich marlstones and limestones deposited in the Tarfaya Basin provides an outstanding opportunity to closely retrace climate evolution and sea-level changes during the Cretaceous greenhouse period. We present high-resolution X-ray fluorescence (XRF) scanning and bulk carbon- and oxygen-isotope records from two newly drilled sediment cores in the Tarfaya Atlantic coastal basin, which recovered a continuous Upper Turonian to Campanian succession of ∼290 m thickness. The XRF core scanning records reveal three long-term oscillations in the abundance of terrigenous elements (increase of Al, Ti, K, Si, and Fe normalized against Ca), which correspond to progressive transgressive phases followed by rapid regressions during the Coniacian and early Santonian. Sea-level highstands during this interval corresponding to the Coniacian–Santonian oceanic anoxic event 3 (OAE 3) are characterized by overall oxygen-depleted to anoxic conditions at the seafloor (indicated by the high organic carbon content, the presence of laminations, and low log[Mn/S], high log[V/Ca], and high log[Br/Ca]). The upper Santonian interval marks the transition from anoxic to oxic bottom-water conditions, prevalent through the early Campanian. The composite bulk carbonate δ13C curve exhibits strong similarities to the global stacked δ13C reference curve, characterized by negative excursions in the early Coniacian (Navigation and East Cliff events) and late Santonian (bracketed by the Haven Brow and Buckle events) and by positive excursions in the latest Turonian (Hitchwood event), middle Coniacian (Wight Fall event), and at the Santonian-Campanian boundary. During the early Campanian, enhanced accumulation of fine-grained carbonate and clay-rich hemipelagic sediments, increasing bulk carbonate δ18O, and low log(Br/Ca) and log(V/Ca) values indicate climate cooling, associated with a substantial improvement in bottom-water ventilation. Two long-term δ13C cycles of ∼2 m.y. duration, probably related to variations in Earth's orbital eccentricity, are associated with the long-term cooling trend initiating the Campanian–Maastrichtian climate transition toward a cool greenhouse state. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.