HR: 1340h
AN: T33C-1482    [Abstracts]
TI: Geometric Model of Conjugate Faulting in the Gyeongsang Basin, Southeastern Korea
AU: * Hwang, B
EM: bhhwang@pangea.stanford.edu
AF: Stanford University, Department of Geological & Environmental Sciences, Stanford, CA 94305-2115, United States
AU: * Hwang, B
EM: bhhwang@pangea.stanford.edu
AF: Pusan National University, Division of Earth Environmental System, Busan, 609-735, Korea, Republic of
AU: Ernst, W G
EM: ernst@geo.stanford.edu
AF: Pusan National University, Division of Earth Environmental System, Busan, 609-735, Korea, Republic of
AU: McWilliams, M
EM: mac@pangea.stanford.edu
AF: Curtin University, John de Laeter Centre of Mass Spectrometry, Perth, WA 6845, Australia
AU: Yang, K
EM: bhhwang@pangea.stanford.edu
AF: Pusan National University, Division of Earth Environmental System, Busan, 609-735, Korea, Republic of
AB: A conjugate fault complex comprised of the NNE-trending dextral Yangsan fault system and the WNW-trending sinistral Gaum fault system cuts the Gyeongsang Basin on the SE margin of the Korean Peninsula. These conjugate faults may have formed contemporaneously in a compressional stress system accompanied by a 12° block rotation and separation as calculated from a geometric model using angles between conjugate fault sets, widths of fault domains, and measured fault displacements. Paleomagnetic show that the angle between declinations in both diverging block sets increases with age, suggestive of progressive block rotation. Assuming a progressive overall rotation of the entire Gyeongsang Basin (or the Korean Peninsula) with respect to the Eurasian continent simultaneously with block rotation within the Gyeongsang Basin, the paleomagnetic data correspond to the geometric model. This model accounts for Yucheon Group volcanism and subsequent caldera subsidence in the Uiseong sub-basin, and volcanism in the Miryang sub-basin produced by regional tension.
DE: 8103 Continental cratons
DE: 8104 Continental margins: convergent
DE: 8108 Continental tectonics: compressional
DE: 8109 Continental tectonics: extensional (0905)
DE: 8111 Continental tectonics: strike-slip and transform
SC: Tectonophysics [T]
MN: 2007 Fall Meeting