HR: 11:05h
AN: GP42A-04 INVITED    [Abstracts]
TI: Can Transitional Paleomagnetic Data Track Changes in the Pattern of Mantle-held Flux?
AU: * Hoffman, K A
EM: khoffman@calpoly.edu
AF: Physics Department, Cal Poly State University, San Luis Obispo, CA 93401, United States
AU: * Hoffman, K A
EM: khoffman@calpoly.edu
AF: Department of Geology and Geophysics, University Of Wisconsin at Madison, Madison, WI 53706, United States
AU: Singer, B S
EM: bsinger@geology.wisc.edu
AF: Department of Geology and Geophysics, University Of Wisconsin at Madison, Madison, WI 53706, United States
AU: Camps, P
EM: camps@dstu.univ-montp2.fr
AF: Géosciences Montpellier, CNRS and Université Montpellier 2, Montpellier, 34095, France
AB: There exists substantial evidence that the lowermost mantle has an influence over the pattern of magnetic flux leaving Earth's core. Although more controversial, there also exist both paleomagnetic and geomagnetic data compatible with the hypothesis that polarity reversal begins with the near total destruction of the axial dipole, leaving a complex field configuration whose source is the variation of physical properties about the core-mantle boundary. If so, it follows that quality, detailed paleomagnetic transition data spanning events over considerable geologic time may provide a unique tool to understanding spatial-temporal aspects of the mantle's effect on core fluid motion and related magnetic flux that reaches Earth's surface. In this talk we explore this possibility given published and newly-analyzed reversal data that span the latter half of the Cenozoic.
DE: 1025 Composition of the mantle
DE: 1507 Core processes (1213, 8115)
DE: 1535 Reversals: process, timescale, magnetostratigraphy
DE: 1560 Time variations: secular and longer
DE: 8120 Dynamics of lithosphere and mantle: general (1213)
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Fall Meeting