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Geophysics of the Pitman Fracture Zone and Pacific-Antarctic Plate Motions During the Cenozoic

Cande, Steven C. and Raymond, Carol A. and Stock, Joann and Haxby, W. F. (1995) Geophysics of the Pitman Fracture Zone and Pacific-Antarctic Plate Motions During the Cenozoic. Science, 270 (5238). pp. 947-953. ISSN 0036-8075. doi:10.1126/science.270.5238.947.

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Multibeam bathymetry and magnetometer data from the Pitman fracture zone (FZ) permit construction of a plate motion history for the South Pacific over the past 65 million years. Reconstructions show that motion between the Antarctic and Bellingshausen plates was smaller than previously hypothesized and ended earlier, at chron C27 (61 million years ago). The fixed hot-spot hypothesis and published paleomagnetic data require additional motion elsewhere during the early Tertiary, either between East Antarctica and West Antarctica or between the North and South Pacific. A plate reorganization at chron C27 initiated the Pitman FZ and may have been responsible for the other right-stepping fracture zones along the ridge. An abrupt (8°) clockwise rotation in the abyssal hill fabric along the Pitman flowline near the young end of chron C3a (5.9 million years ago) dates the major change in Pacific-Antarctic relative motion in the late Neogene.

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Raymond, Carol A.0000-0002-4213-8097
Stock, Joann0000-0003-4816-7865
Additional Information:© 1995 American Association for the Advancement of Science. 26 May 1995; accepted 11 October 1995. We thank Captain J. O'Laughlin the officers, crew, and scientific staff of the RN Ewing for their efforts during the cruise. S. O'Hara contributed to processing the data at sea. Discussions with W. B. F. Ryan, T. Atwater, and many other colleagues have been greatly appreciated. A. Macario and two anonymous reviewers made many valuable comments. Drafting expertise was provided by B. Batchelder at Lamont and J. Griffith at Scripps. Funding was provided by NSF grants OPP-90-18742 and OCE-91-03573 to the Lamont-Doherty Earth Observatory, OCE-93-00945 to the Scripps Institution of Oceanography and EAR-92-96102 to Caltech. LDEO contribution #5419, Caltech contribution #5605.
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
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Lamont-Doherty Earth ObservatoryOCE-93-00945
Scripps Institution of OceanographyEAR-92-96102
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Other Numbering System NameOther Numbering System ID
Lamont-Doherty Earth Observatory5419
Caltech Division of Geological and Planetary Sciences5605
Issue or Number:5238
Record Number:CaltechAUTHORS:20140909-083626726
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Official Citation:Geophysics of the Pitman Fracture Zone and Pacific-Antarctic Plate Motions During the Cenozoic Steven C. Cande, Carol A. Raymond, Joann Stock and William F. Haxby Science, New Series, Vol. 270, No. 5238 (Nov. 10, 1995), pp. 947-953
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49476
Deposited By: Ruth Sustaita
Deposited On:09 Sep 2014 16:48
Last Modified:23 Nov 2022 19:16

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