HR: 09:15h
AN: GP41A-06    [PDF]
TI: Paleomagnetic and Environmental Magnetic Results from ODP Leg 195, Site 1202, Okinawa Trough
AU: * Venuti, A
EM: venuti@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, Rome, 00143 Italy
AU: Verosub, K L
EM: verosub@geology.ucdavis.edu
AF: University of California, Davis, One Shields Ave., Davis, CA 95616 United States
AU: Richter, C
EM: crichter@louisiana.edu
AF: University of Louisiana, Lafayette, Madison Hall, PO Box 44530, Lafayette, LA 70504 United States
AB: We have been studying the paleomagnetic and environmental magnetic record of a suite of u-channel samples that span the upper 140 meters of ODP Site 1202. This site was drilled during Leg 195 in the southernmost Okinawa Trough off the east coast of Taiwan. The southern Okinawa Trough currently has a high rate of sedimentation due to the enormous input of terrigenous material from the East China shelf and Taiwan. The sampled section yields a reliable paleomagnetic record and an environmental magnetic record that has five distinct zones. Analysis of hysteresis parameters and anhysteretic remanent magnetization behavior indicate that the sediments satisfy the requirements for paleointensity determination and that either susceptibility or ARM can be used as normalization parameters. Using either method, we can correlate the upper 50 meters of Site 1202 with the Holocene paleointensity record from Fish Lake, Oregon. The remaining 90 meters can be correlated with the NAPIS-75 paleointensity stack. These correlations show that the base of the studied section is only 50,000 years old and that Site 1202 represents one of the highest resolution records of geomagnetic field behavior and environmental change ever reported.
DE: 1512 Environmental magnetism
DE: 1521 Paleointensity
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2003 Fall Meeting