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au=(moore t.)

HR: 16:00h
AN: U12B-01
TI: Tracking the Equator Into the Paleogene
AU: * Moore, T C
EM: tedmoore@umich.edu
AF: University of Michigan, Department of Geological Sciences, Ann Arbor, MI 48109-1063 United States
AU: Lyle, M
EM: mlyle@cgiss.idbsu.edu
AF: Boise State University, CGISS MS 1536, Boise, ID 83725-1536 United States
AU: Backman, J
EM: backman@geo.su.se
AF: Department of Geology and Geochemistry, Stockholm University, Stockholm, 106 91 Sweden
AU: Raffi, I
EM: raffi@unich.it
AF: Universitario Madonna delle Piane, Dipartimento di Scienze della Terra - Universita' "G. d'Annunzio", Chieti Scalo, 66013 Italy
AU: Sanfilippo, A
EM: annika@ucsd.edu
AF: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0220 United States
AU: Nigrini, C
EM: catherine@nigrini.net
AF: University of Michigan, Department of Geological Sciences, Ann Arbor, MI 48109-1063 United States
AU: P\"{a}like, H
EM: heiko@geo.su.se
AF: Boise State University, CGISS MS 1536, Boise, ID 83725-1536 United States
AB: Stratigraphy has been compiled for 63 tropical Pacific drill sites that sample lower Neogene and Paleogene sediments. These Sites derive from drilling on DSDP Leg 5 through ODP Leg 199. All Sites have been put on the biostratigraphic and paleomagnetic timescale refined by Leg 199 scientists. Sediment accumulation rates have been calculated for ten intervals ranging in age from 10 Ma to 56 Ma. A simple fixed hotspot model was used for Pacific lithospheric plate rotation in reconstructing the position of the selected sites for each of these ten intervals. The reconstruction of all intervals show the development of a tongue of relatively high accumulation rates associated with the oceanographic divergence at the geographic equator. The estimated position of the geographic equator based on these reconstructions lies consistently south of the position of the equator based on the rotation model used. However, the southward displacement is generally 2 degrees of latitude or less. We believe that this relatively small disagreement between the two estimates of equatorial position back to 56 Ma indicates: 1) Whatever hotspot movement that may have occurred in the interval between 40 and 56 Ma did not affect the motion of the Pacific plate; its motion after 40 Ma appears to have been approximately the same as before 40 Ma. 2) The estimated rate of true polar wander during the interval of 40 - 56 Ma must be very small (~0.125$\deg$/m.y.) and is probably not significant (i.e., well within the error of these reconstructions).
DE: 1206 Crustal movements--interplate (8155)
DE: 3030 Micropaleontology
DE: 3040 Plate tectonics (8150, 8155, 8157, 8158)
DE: 4231 Equatorial oceanography
SC: U
MN: 2003 Fall Meeting