Title: Mode and tempo of the Paleocene-Eocene thermal maximum in an expanded section from the Venetian pre-Alps
Abstract: Research Article| March 01, 2007 Mode and tempo of the Paleocene-Eocene thermal maximum in an expanded section from the Venetian pre-Alps Luca Giusberti; Luca Giusberti 1Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy Search for other works by this author on: GSW Google Scholar Domenico Rio; Domenico Rio 2Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy, and Institute of Geosciences and Earth Resources, Consiglio Nazionale delle Ricerche (CNR) Padova, c/o Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy Search for other works by this author on: GSW Google Scholar Claudia Agnini; Claudia Agnini 3Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy Search for other works by this author on: GSW Google Scholar Jan Backman; Jan Backman 4Department of Geology and Geochemistry, Stockholm University, SE-106 91 Stockholm, Sweden Search for other works by this author on: GSW Google Scholar Eliana Fornaciari; Eliana Fornaciari 5Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy Search for other works by this author on: GSW Google Scholar Fabio Tateo; Fabio Tateo 6Institute of Geosciences and Earth Resources, Consiglio Nazionale delle Ricerche (CNR) Padova, c/o Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy Search for other works by this author on: GSW Google Scholar Massimo Oddone Massimo Oddone 7Department of General Chemistry, University of Pavia, Via Taramelli 12, I-27100 Pavia, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information Luca Giusberti 1Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy Domenico Rio 2Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy, and Institute of Geosciences and Earth Resources, Consiglio Nazionale delle Ricerche (CNR) Padova, c/o Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy Claudia Agnini 3Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy Jan Backman 4Department of Geology and Geochemistry, Stockholm University, SE-106 91 Stockholm, Sweden Eliana Fornaciari 5Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy Fabio Tateo 6Institute of Geosciences and Earth Resources, Consiglio Nazionale delle Ricerche (CNR) Padova, c/o Department of Geology, Paleontology and Geophysics, Padova University, Via Giotto 1, I-35137 Padova, Italy Massimo Oddone 7Department of General Chemistry, University of Pavia, Via Taramelli 12, I-27100 Pavia, Italy Publisher: Geological Society of America Received: 01 Mar 2006 Revision Received: 01 Sep 2006 Accepted: 14 Sep 2006 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 GEOLOGICAL SOCIETY OF AMERICA GSA Bulletin (2007) 119 (3-4): 391–412. https://doi.org/10.1130/B25994.1 Article history Received: 01 Mar 2006 Revision Received: 01 Sep 2006 Accepted: 14 Sep 2006 First Online: 08 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 Luca Giusberti, Domenico Rio, Claudia Agnini, Jan Backman, Eliana Fornaciari, Fabio Tateo, Massimo Oddone; Mode and tempo of the Paleocene-Eocene thermal maximum in an expanded section from the Venetian pre-Alps. GSA Bulletin 2007;; 119 (3-4): 391–412. doi: https://doi.org/10.1130/B25994.1 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 The central part of the Piave River valley in the Venetian pre-Alps of NE Italy exposes an expanded and continuous marine sediment succession that encompasses the Paleocene series and the Paleocene to Eocene transition. The Paleocene through lowermost Eocene succession is >100 m thick and was deposited at middle to lower bathyal depths in a hemipelagic, near-continental setting in the central western Tethys. In the Forada section, the Paleocene succession of limestone-marl couplets is sharply interrupted by an ∼3.30-m-thick unit of clays and marls (clay marl unit). The very base of this unit represents the biostratigraphic Paleocene-Eocene boundary, and the entire unit coincides with the main carbon isotope excursion of the Paleocene-Eocene thermal maximum event. Concentrations of hematite and biogenic carbonate, δ13C measurements, and abundance of radiolarians, all oscillate in a cyclical fashion and are interpreted to represent precession cycles. The main excursion interval spans five complete cycles, that is, 105 ± 10 k.y. The overlying carbon isotope recovery interval, which is composed of six distinct limestone-marl couplets, is interpreted to represent six precessional cycles with a duration of 126 ± 12 k.y. The entire carbon isotope excursion interval in Forada has a total duration of ∼231 ± 22 k.y., which is 5%–10% longer than previous estimates derived from open ocean sites (210–220 k.y.). Geochemical proxies for redox conditions indicate oxygenated conditions before, during, and after the carbon isotope excursion event. The Forada section exhibits a nonstepped sharp decrease in δ13C (−2.35‰) at the base of the clay marl unit. The hemipelagic, near-continental depositional setting of Forada and the sharply elevated sedimentation rates throughout the clay marl unit argue for continuous rather than interrupted deposition and show that the initial nonstepped carbon isotope shift was not caused by a hiatus. A single sample at the base of the unit lacks biogenic carbonate. Preservation of carbonate thereafter improves progressively up-section in the clay marl unit, which is consistent with a prodigiously abrupt and rapid acidification of the oceans followed by a slower, successive deepening of the carbonate compensation depth. Increased sedimentation rates through the clay marl unit (approximately the main interval of the carbon isotope excursion) are consistent with an intensified hydrological cycle driven by super-greenhouse conditions and enhanced weathering and transport of terrigenous material to this near-continental, hemipelagic environment in the central western Tethys.The sharp transition in lithology from the clay marl unit to the overlying limestone-marl couplets in the recovery interval and the coincident shift toward heavier δ13C values suggest that the silicate pump and continental weathering, the cause of the enhanced terrigenous flux to Forada, stopped abruptly. This implies that the source of the light CO2 eased to be added to the ocean-atmosphere system at the top of the clay marl unit. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 2006
Publication Date: 2006-12-18
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 126
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot