Iron X-ray fluorescence (XRF) scannings of ODP Holes 165-1001A and 171-1050C

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-...

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Bibliographic Details
Main Authors: Röhl, Ursula, Ogg, James G, Geib, Tricia L, Wefer, Gerold
Format: Other/Unknown Material
Language:English
Published: PANGAEA 2001
Subjects:
165-1001A
171-1050C
Blake Nose
North Atlantic Ocean
Caribbean Sea
DRILL
Drilling/drill rig
Joides Resolution
Leg165
Leg171B
Ocean Drilling Program
ODP
XRF core scanner
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.774793
https://doi.org/10.1594/PANGAEA.774793
Description
Summary: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.

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