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Röhl, Ursula; Ogg, James G; Geib, Tricia L; Wefer, Gerold (2001): Iron X-ray fluorescence (XRF) scannings of ODP Holes 165-1001A and 171-1050C [dataset publication series]. PANGAEA,, Supplement to: Röhl, U et al. (2001): Astronomical calibration of the Danian time scale. In: Norris, R D, Kroon, D, & Klaus, A (eds.), Western North Atlantic Palaeogene and Cretaceous Palaeoceanography. Geological Society, London, Special Publication, 183, 163-183,

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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 Danian stage (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.
XRF core scanner
Median Latitude: 22.928505 * Median Longitude: -75.572735 * South-bound Latitude: 15.757100 * West-bound Longitude: -76.234970 * North-bound Latitude: 30.099910 * East-bound Longitude: -74.910500
Date/Time Start: 1996-02-07T02:45:00 * Date/Time End: 1997-02-08T19:30:00
165-1001A * Latitude: 15.757100 * Longitude: -74.910500 * Date/Time Start: 1996-02-07T02:45:00 * Date/Time End: 1996-02-12T19:30:00 * Elevation: -3260.0 m * Penetration: 522.8 m * Recovery: 286.24 m * Location: Caribbean Sea * Campaign: Leg165 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 56 cores; 522.8 m cored; 0 m drilled; 54.8 % recovery
171-1050C * Latitude: 30.099910 * Longitude: -76.234970 * Date/Time: 1997-02-08T19:30:00 * Elevation: -2296.5 m * Penetration: 606 m * Recovery: 200.19 m * Location: Blake Nose, North Atlantic Ocean * Campaign: Leg171B * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 31 core; 288.5 m cored; 317.5 m drilled; 69.4 % recovery
2 datasets

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Datasets listed in this publication series

  1. Röhl, U; Ogg, JG; Geib, TL et al. (2001): Iron of ODP Hole 165-1001A.
  2. Röhl, U; Ogg, JG; Geib, TL et al. (2001): Iron of ODP Hole 171-1050C.