HR: 17:15h
AN: GP44A-06    [Abstracts]
TI: A Paleomagnetic Study of Mt. Erebus Volcanic Province, Antarctica
AU: * Lawrence, K
EM: klawrence@ucsd.edu
AF: Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, Mail Code: 0225, La Jolla, CA 92093-0225 United States
AU: Tauxe, L
GP44A-06 AF: Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, Mail Code: 0225, La Jolla, CA 92093-0225 United States
AU: Constable, C
GP44A-06 AF: Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, Mail Code: 0225, La Jolla, CA 92093-0225 United States
AU: Staudigel, H
GP44A-06 AF: Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, Mail Code: 0225, La Jolla, CA 92093-0225 United States
AU: Konter, J
GP44A-06 AF: Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, Mail Code: 0225, La Jolla, CA 92093-0225 United States
AU: Vernon, F
GP44A-06 AF: Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, Mail Code: 0225, La Jolla, CA 92093-0225 United States
AB: The Mt. Erebus Volcanic Province in Antarctica provides an excellent opportunity to improve high latitude sampling of lava flows suitable for studying the time-averaged paleomagnetic field and its paleosecular variation. Previous work in this region focused on Bruhnes-aged flows, so in our 2004 field season we preferentially sampled older, and reversed polarity flows to provide good temporal sampling for 0-5~Ma. Ten samples were collected from each of 69 suitable flows. Each sample is cored and oriented using one or more of sun compass, magnetic compass, and a new technique employing a 1-meter baseline differential GPS system to determine azimuth. The differential GPS orientation method, which was developed for locations and times where the sun and magnetic compasses are unreliable, is as accurate as sun compass measurements. The data set of NRMs is composed of 26 normal, 27 reversed, and 16 transitional sites. In general, these older sites show more overprinting than sites sampled in previous Mt. Erebus Volcanic Province studies. AF and thermal demagnetization are under way so that characteristic components can be determined using principal component analysis. New paleointensity and directional results will be merged with those from previous studies, and contribute to high latitude and global analysis of the 0-5 Ma field.
DE: 1500 GEOMAGNETISM AND PALEOMAGNETISM
DE: 1521 Paleointensity
DE: 1522 Paleomagnetic secular variation
SC: Geomagnetism and Paleomagnetism [GP]
MN: Fall Meeting 2005