Episodes of high productivity and cooling in the early Aptian Alpine Tethys

Abstract

Research Article| July 01, 1999 Episodes of high productivity and cooling in the early Aptian Alpine Tethys Peter A. Hochuli; Peter A. Hochuli 1Institute of Geology, ETH-Zürich, CH-8092 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Alessio P. Menegatti; Alessio P. Menegatti 1Institute of Geology, ETH-Zürich, CH-8092 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Helmut Weissert; Helmut Weissert 1Institute of Geology, ETH-Zürich, CH-8092 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Angelo Riva; Angelo Riva 2ENI Agip Exploration & Production Division, San Donato Milanese, Italy Search for other works by this author on: GSW Google Scholar Elisabetta Erba; Elisabetta Erba 3Department of Earth Sciences, University of Milan, 20133 Milan, Italy Search for other works by this author on: GSW Google Scholar Isabella Premoli Silva Isabella Premoli Silva 3Department of Earth Sciences, University of Milan, 20133 Milan, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information Peter A. Hochuli 1Institute of Geology, ETH-Zürich, CH-8092 Zürich, Switzerland Alessio P. Menegatti 1Institute of Geology, ETH-Zürich, CH-8092 Zürich, Switzerland Helmut Weissert 1Institute of Geology, ETH-Zürich, CH-8092 Zürich, Switzerland Angelo Riva 2ENI Agip Exploration & Production Division, San Donato Milanese, Italy Elisabetta Erba 3Department of Earth Sciences, University of Milan, 20133 Milan, Italy Isabella Premoli Silva 3Department of Earth Sciences, University of Milan, 20133 Milan, Italy Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (7): 657–660. https://doi.org/10.1130/0091-7613(1999)027<0657:EOHPAC>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 Peter A. Hochuli, Alessio P. Menegatti, Helmut Weissert, Angelo Riva, Elisabetta Erba, Isabella Premoli Silva; Episodes of high productivity and cooling in the early Aptian Alpine Tethys. Geology 1999;; 27 (7): 657–660. doi: https://doi.org/10.1130/0091-7613(1999)027<0657:EOHPAC>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 A palynological and organic geochemical study of the early Aptian Selli unit (oceanic anoxic event 1a) of the western Tethys provides new information about paleoceanography and documents pronounced changes in the regional climate pattern. It also emphasizes the role of oxic degradation of organic matter, even at horizons with the highest rates of organic carbon (Corg) accumulation. The absence of anoxia indicates that enhanced primary production is the main reason for these organic carbon accumulations, and variations in preservation are related to pulses in primary production and nutrient recycling. Despite the high-productivity character of the Selli unit black shales, the δ13Ccarb values are not marked by a positive shift, but by an interval of unchanged values. Warm climatic conditions for deposition of the Selli unit are inferred from the presence of southern provenance pollen and low δ18O values. For the interval above the Selli unit, changes in the pollen spectrum and an increase in δ18O values reflect a hitherto undocumented late early Aptian cooler and more humid climate and/or a reorganization of the Tethyan oceanographic circulation pattern. 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.