Geochronology and calibration of global Milankovitch cyclicity at the Cenomanian-Turonian boundary

Abstract

Research Article| June 01, 2001 Geochronology and calibration of global Milankovitch cyclicity at the Cenomanian-Turonian boundary Andreas Prokoph; Andreas Prokoph 1Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, University of Ottawa, 140 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada Search for other works by this author on: GSW Google Scholar Mike Villeneuve; Mike Villeneuve 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A OE8, Canada Search for other works by this author on: GSW Google Scholar Frederik P. Agterberg; Frederik P. Agterberg 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A OE8, Canada Search for other works by this author on: GSW Google Scholar Volker Rachold Volker Rachold 3Alfred Wegener Institute for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A43, 14473 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Andreas Prokoph 1Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, University of Ottawa, 140 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada Mike Villeneuve 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A OE8, Canada Frederik P. Agterberg 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A OE8, Canada Volker Rachold 3Alfred Wegener Institute for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A43, 14473 Potsdam, Germany Publisher: Geological Society of America Received: 13 Nov 2000 Revision Received: 13 Feb 2001 Accepted: 26 Feb 2001 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (6): 523–526. https://doi.org/10.1130/0091-7613(2001)029<0523:GACOGM>2.0.CO;2 Article history Received: 13 Nov 2000 Revision Received: 13 Feb 2001 Accepted: 26 Feb 2001 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Andreas Prokoph, Mike Villeneuve, Frederik P. Agterberg, Volker Rachold; Geochronology and calibration of global Milankovitch cyclicity at the Cenomanian-Turonian boundary. Geology 2001;; 29 (6): 523–526. doi: https://doi.org/10.1130/0091-7613(2001)029<0523:GACOGM>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 New 40Ar/39Ar geochronology and global cyclostratigraphic calibration provide high-resolution insights into the timing of geochemical fluctuations across oceanic anoxic event II (OAE II). Five new 40Ar/39Ar data from a single section in western Canada suggest an age of 96.4 ± 1 Ma for the Cenomanian-Turonian (C-T) boundary. This is ∼3 m.y. older than previously dated. Time-series analysis (e.g., wavelet transform) reveals that OAE II was synchronously deposited worldwide over a period of ∼320 k.y. The preservation and stationarity of Milankovitch cyclicity in sections across the Atlantic indicates that no major fluctuations in sedimentation rate occur across the OAE II, except for a minor short- term decrease in the rate just before the C-T boundary. A δ13Corg increase of >2‰ took place at the beginning of OAE II over a period of ∼110 k.y., and likely represents a period of worldwide excessive organic carbon burial during transgression, leading to a 12C depletion of seawater and sedimentation. This interval was followed by a three-step decrease to pre-OAE II δ13C values. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.