HR: 0800h
AN: GP21B-0502    [Abstracts]
TI: Paleomagnetism of ~4551 Ma old Richardton chondrite
AU: * Yu, Y
EM: yongjaeyu@naver.com
AF: Department of Earth and Environmental Sciences, Korea University, Seoul, 136-713, Korea, Republic of
AU: Doh, S
EM: sjdoh@korea.ac.kr
AF: Department of Earth and Environmental Sciences, Korea University, Seoul, 136-713, Korea, Republic of
AU: Kim, W
EM: wnkim@korea.ac.kr
AF: Department of Earth and Environmental Sciences, Korea University, Seoul, 136-713, Korea, Republic of
AU: Min, K
EM: Kmin@ufl.edu
AF: Department of Geological Sciences, University of Florida, Gainsville, FL 32608, United States
AB: Magnetic and mineralogic variation of the Chondrites provides important information about the early evolution of the solar system and the formation of planetary objects. In the present study, we used several chips of Richardton (~4551 Ma). On the basis of rock magnetic, microscopic, and electron microprobe analyses on rock chips and mineral separates, we suggest that silicate-hosted Fe-Ni is responsible for the stable paleomagnetic record of Richardton. Small amounts of accessory opaque minerals including Cr-spinel, Fe-Ni- oxide, and Fe-sulfide are confined along the cracks between silicates, reflecting their secondary shock-origin and their little contribution to the stable remanence.
DE: 1500 GEOMAGNETISM AND PALEOMAGNETISM
DE: 1519 Magnetic mineralogy and petrology
DE: 1540 Rock and mineral magnetism
DE: 6200 PLANETARY SCIENCES: SOLAR SYSTEM OBJECTS
DE: 6240 Meteorites and tektites (1028, 3662)
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Fall Meeting