Astronomical calibration of the Danian time scale and spreading rates

Author(s): Ogg, James G.; Röhl, Ursula; Geib, Tricia L.; Wefer, Gerold
Author Affiliation(s): Primary:
Purdue University, Department of Earth and Atmospheric Sciences, West Lafayette, IN, United States
Other:
Bremen University, Federal Republic of Germany
Volume Title: Geological Society of America, 1999 annual meeting
Source: Abstracts with Programs - Geological Society of America, 31(7), p.289-290; Geological Society of America, 1999 annual meeting, Denver, CO, Oct. 25-28, 1999. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592 CODEN: GAAPBC
Note: In English
Summary: High-resolution geochemical profiles through Danian (lowermost Cenozoic) pelagic sediments from the Caribbean Sea (Ocean Drilling Site 1001A) and the Blake Nose margin of Florida (ODP Site 1050C) display regular variations of Fe abundance associated with Milankovitch orbital-climate cycles of obliquity and precession. Upper Danian magnetic polarity zone C27 spans 35 to 36 obliquity cycles at both sites. The corresponding cycle-tuned duration of 1.47 million years is consistent with trends from astronomical tuning of lower Danian polarity chron C29 and revised 40Ar/39Ar age calibration of the Campanian through Eocene magnetic polarity time scale.The complete cycle-tuned Danian stage spans 3.65 m. y. (65.5 Ma to 61.85 Ma). Spreading rates on the synthetic South Atlantic marine magnetic profile that serves as a standard for scaling magnetic polarity chrons display progressive slowing during the Maastrichtian through Danian stages, a constant rate during the late Paleogene and early Eocene epochs, followed by a rapid acceleration during the middle Eocene.
Year of Publication: 1999
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Blake Nose; Blake Plateau; Calibration; Caribbean Sea; Cenozoic; Cretaceous; Cycles; Danian; High-resolution methods; Iron; Leg 165; Leg 171B; Lower Paleocene; Maestrichtian; Magnetostratigraphy; Marine sediments; Mesozoic; Metals; Milankovitch theory; North Atlantic; ODP Site 1001; ODP Site 1050; Ocean Drilling Program; Paleocene; Paleogene; Paleomagnetism; Pelagic environment; Precession; Sea-floor spreading; Sediments; Senonian; South Atlantic; Tertiary; Time scales; Upper Cretaceous; Variations
Coordinates: N154524 N154524 W0745436 W0745436
N300600 N300600 W0761406 W0761406
Record ID: 2001019136
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States