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Geology; June 2001; v. 29; no. 6; p. 523-526; DOI: 10.1130/0091-7613(2001)029<0523:GACOGM>2.0.CO;2
© 2001 Geological Society of America
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Geochronology and calibration of global Milankovitch cyclicity at the Cenomanian-Turonian boundary

Andreas Prokoph*,1, Mike Villeneuve*,2, Frederik P. Agterberg*,2 and Volker Rachold*,3

1 Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, University of Ottawa, 140 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada
2 Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A OE8, Canada
3 Alfred Wegener Institute for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A43, 14473 Potsdam, Germany

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 {delta}13Corg increase of >2{per thousand} 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 {delta}13C values.

Key Words: Cenomanian-Turonian boundary • geochronology • cyclostratigraphy • carbon isotopes




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