Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9713917c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. B10, Sept. 10, 1992, p. 13,917-13,951.
Physics
355
Cenozoic Era, Cretaceous Period, Magnetic Anomalies, Paleomagnetism, Sea Floor Spreading, Mid-Ocean Ridges, Polarity, Tectonics
Scientific paper
A new geomagnetic polarity time scale for the late Cretaceous and Cenozoic is constructed on the basis of an analysis of magnetic profiles from the world's major ridge systems. Based on the assumption that spreading rates in the South Atlantic were smoothly varying but not necessarily constant, a time scale was generated using a spline function to fit a set of nine age calibration points plus the zero-age ridge axis to the composite polarity sequence. The derived spreading history of the South Atlantic shows a regular variation in spreading rate, decreasing in the Late Cretaceous from a high of almost 70 mm/yr (full rate) at around anomaly 33-34 time to a low of about 30 mm/yr by anomaly 27 time in the early Paleocene, increasing to about 55 mm/yr about anomaly 15 time in the late Eocene, and then gradually decreasing over the Oligocene and the Neogene to the recent rate of about 32 mm/yr. The new time scale helps to resolve events at the times of major plate reorganizations.
Cande Steven C.
Kent Dennis V.
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