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Science 10 September 1993:
Vol. 261. no. 5127, pp. 1431 - 1434
DOI: 10.1126/science.261.5127.1431
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Articles

Late Cretaceous Precessional Cycles in Double Time: A Warm-Earth Milankovitch Response

J. Park 1, S. L. D'Hondt 2, J. W. King 2, and C. Gibson 2

1 Department of Geology and Geophysics, Post Office Box 6666, Yale University, New Haven, CT 06511
2 Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02882

Late Cretaceous climatic cycles are reflected in lithological and magnetic variations in carbonate sediments from South Atlantic Deep-Sea Drilling Project site 516F at a paleolatitude of roughly 30°S. Magnetic susceptibility cycles 20 to 60 centimeters in length appear to be controlled by the precession of the equinoxes. Cyclicity is particularly robust within a 24-meter interval in the lower Campanian, where overtone spectral peaks are observed as well as secondary susceptibility maxima within individual precession cycles. One model for this behavior is that sedimentation in the narrow Cretaceous South Atlantic was controlled by equatorial climate dynamics, with the precessional insolation signal rectified by the large land masses surrounding the ocean basin.

Submitted on March 26, 1993
Accepted on July 8, 1993


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Science. ISSN 0036-8075 (print), 1095-9203 (online)