Cyclic anoxic events in the Early Cretaceous Tethys Ocean

Abstract

Research Article| March 01, 1979 Cyclic anoxic events in the Early Cretaceous Tethys Ocean Helmut Weissert; Helmut Weissert 1Geology Department, Swiss Federal Institute of Technology, Zurich, Switzerland Search for other works by this author on: GSW Google Scholar Judith McKenzie; Judith McKenzie 1Geology Department, Swiss Federal Institute of Technology, Zurich, Switzerland Search for other works by this author on: GSW Google Scholar Peter Hochuli Peter Hochuli 1Geology Department, Swiss Federal Institute of Technology, Zurich, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information Helmut Weissert 1Geology Department, Swiss Federal Institute of Technology, Zurich, Switzerland Judith McKenzie 1Geology Department, Swiss Federal Institute of Technology, Zurich, Switzerland Peter Hochuli 1Geology Department, Swiss Federal Institute of Technology, Zurich, Switzerland Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1979) 7 (3): 147–151. https://doi.org/10.1130/0091-7613(1979)7<147:CAEITE>2.0.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 Helmut Weissert, Judith McKenzie, Peter Hochuli; Cyclic anoxic events in the Early Cretaceous Tethys Ocean. Geology 1979;; 7 (3): 147–151. doi: https://doi.org/10.1130/0091-7613(1979)7<147:CAEITE>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 Cyclic black shale and nannofossil limestone units of the Lower Cretaceous Maiolica Formation of the southern Alps have been studied. From sedimentological data, the black shale units appear to have been formed in an euxinic basin that experienced periodic overturn and basinal aeration. The carbon-13 values of the calcareous nannofossils serve as indicators of paleocirculation. In the Barremian, the palynological spectra of the black shale units reveal a drastic alteration from a warm, dry to a cooler, humid climate. As a result, thermohaline circulation in the western Tethys Ocean was replaced by density stratification, and stagnation of the deeper basins followed. 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.