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Book Chapter

Astronomical calibration of the Danian time scale

By
Ursula Röhl
Ursula Röhl
Geosciences Department, Bremen University, D-28334 Bremen, Germany (uroehl@allgeo.uni-bremen.de)
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James G. Ogg
James G. Ogg
Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907-1397, USA
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Tricia L. Geib
Tricia L. Geib
Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907-1397, USA
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Gerold Wefer
Gerold Wefer
Geosciences Department, Bremen University, D-28334 Bremen, Germany (uroehl@allgeo.uni-bremen.de)
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Published:
January 01, 2001

Abstract

Ocean Drilling Program Sites 1001A (Caribbean Sea) and 1050C (western North Atlantic) display obliquity and precession cycles throughout polarity zone C27 of the late Danian stage (earliest Cenozoic time). Sliding-window spectra analysis and direct cycle counting on downhole logs and high-resolution Fe variations at both sites yield the equivalent of 35–36 obliquity cycles. This cycle-tuned duration for polarity chron C27 of 1.45 Ma (applying a modern mean obliquity period of 40.4 ka) is consistent with trends from astronomical tuning of early Danian polarity chron C29 and 40Ar/39Ar age calibration of the Campanian-Maastrichtian magnetic polarity time scale. The cycle-tuned Danianstage (sensu Berggren et al. 1995, in SEPM Special Publications, 54, 129–212) spans 3.65 Ma (65.5–61.85 Ma). Spreading rates on a reference South Atlantic synthetic profile display progressive slowing during the Maastrichtian to Danian stages, then remained relatively constant through late Palaeocene and early Eocene time.

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Contents

Geological Society, London, Special Publications

Western North Atlantic Palaeogene and Cretaceous Palaeoceanography

Dick Kroon
Dick Kroon
University of Edinburgh, UK
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R. D. Norris
R. D. Norris
Woods Hole OI, USA
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A. Klaus
A. Klaus
Ocean Drilling Program, USA
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Geological Society of London
Volume
183
ISBN electronic:
9781862394315
Publication date:
January 01, 2001

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