HR: 1340h
AN: T43B-1330    [Abstracts]
TI: Nano-particle Analysis of Fault Gouge in the Chelungpu Fault of Taiwan
AU: * Chou, Y
EM: d95224003@ntu.edu.tw
AF: Department of Geology, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan, Taipei, 10617, Taiwan
AU: Tsao, T
EM: soutp@yahoo.com.tw
AF: Department of Agricultural Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan, Taipei, 10617, Taiwan
AU: Song, S
EM: srsong@ntu.edu.tw
AF: Department of Geology, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan, Taipei, 10617, Taiwan
AU: Yeh, E
EM: enchaoyeh@ntu.edu.tw
AF: Department of Geology, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan, Taipei, 10617, Taiwan
AU: Wang, M
EM: mkwang@ntu.edu.tw
AF: Department of Agricultural Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan, Taipei, 10617, Taiwan
AU: Lin, C
EM: csclin@ntu.edu.tw
AF: Department of Materials Science and Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwan, Taipei, 10617, Taiwan
AU: Lee, T
EM: tqlee@earth.sinica.edu.tw
AF: Institute of Earth Sciences, Academia Sinica, 128 Academia Road Sec. 2, Nankang Taipei 115 Taiwan, Taipei, 11529, Taiwan
AU: Chen, H
EM: diopside@mail.ntou.edu.tw
AF: Institute of Applied Geosciences, National Taiwan Ocean University, No.2, Beining Rd., Keelung 202-24, Taiwan, Keelung, 20224, Taiwan
AB: The strain energy released during an earthquake is partitioned into radiated energy, heat and fracture energy during seismic rupture. The fracture energy can be estimated from grain size distributions of gouge in the slip zone of a fault core. However, the finer particle size is the most critical for calculating the total amounts of it. This study, thus, focuses on the issue of determining the lower cut-off grain size to estimate seismic fracture energy based on the analysis of nanosize particles. Fault gouge samples were slipped by the Chelungpu fault during the Chi-Chi earthquake was taken from an outcrop near Wu-Feng, central Taiwan and was separated it into different particle size ranges by centrifuge and filter. Mineral species were identified by XRD and the mircofabric of particles was investigated by SEM and TEM in different size ranges. The XRD results indicate that the dominant minerals include quartz, plagioclase, clay minerals (smectite and illite) and hydrated minerals (halloysite and vermiculite). The relative amount of quartz decreases with deceasing grain size but the relative amount of clay and hydrated minerals increase. Thus, we infer that quartz could be ruptured into 25~50 nm by faulting and the fault gouge on the surface outcrop was experienced weathering process.
DE: 8004 Dynamics and mechanics of faulting (8118)
DE: 8118 Dynamics and mechanics of faulting (8004)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting