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題名 | Structure and Motion of the Southwestern Taiwan Fold and Thrust Belt=臺灣西南部褶皺衝斷帶的構造及運動 |
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作者 | 洪日豪; 林煌棋; 方朋; Hung, Jih-hao; Lin, Huang-chi; Fang, Peng; Wiltschko,David V.; Hickman,John B.; Bock,Yehuda; |
期刊 | Terrestrial, Atmospheric and Oceanic Sciences |
出版日期 | 19990900 |
卷期 | 10:3 1999.09[民88.09] |
頁次 | 頁543-568 |
分類號 | 356.232 |
語文 | eng |
關鍵詞 | 臺灣西南部; 褶皺衝斷帶; Active tectonics; Balanced cross sections; GPS method; Fold and thrust belt; |
英文摘要 | Surface and limited seismic data have been used to construct new crosssections across the southwestern Taiwan Fold and Thrust Belt. South ofChiayi, the best fit to the data is achieved if the detachment lies at a depthof 10 to 12 km, stepping up to about 6 km to the west. The Chukou fault andits extension to the south (Lunhou fault) are not the frontal structures inthis area. Available data indicate the frontal structure may be composed ofincipient reactivated normal faults in the north and triangle zones in thesouth. Published leveling data show that, whatever the structure, it is grow-ing. From north of Chiayi to the south the salient nature of the structuresof the Foothills province include: 1) a considerable amount ofpre-Miocenestrata are involved in the deformation. The involvement of pre-Miocenedecreases to the south, but the depth of the basal detachment does not changedue to the thickening of the Miocene and younger section; 2) the involve-ment of pre-existing normal faults and consequent 'basement' highs affect-ing the trajectory of thrust ramps abruptly ends south of Chiayi, separatedby buried transverse faults from, 3) the thick foreland synorogenic strati-graphic sequence rides passively above the duplex wedge. Current seismic-ity appears to have no correlation to the interpreted locations of faults, whether thrust, normal or strike-slip. Preliminary GPS data from this portion of the fold and thrust belt in- dicates, as first shown by Yu and Chen (1994), that structures are generally moving westward with respect to the Chinese craton. However, our data show abrupt changes in horizontal velocity, not all of which are associated with mapped faults. There is a region of high horizontal velocity and strain rate to the east of the Chukou-Lunhou fault. On a finer scale, the velocities can vary greatly over distances of as little as 10 km. Some thrust sheetsappear to be rotating counterclockwise around a vertical axis whereas others appear to be moving uniformly westward. Horizontal velocities are uniformly low in the Coastal Plain although they increase from west to eastinto the region of folding and blind thrusting in the footwall of the ChukouLunhou fault. The eastward increasing of shortening velocity in the Foothills Belt implies that a common detachment exists at depth or thrusts inthe east of the Chukou-Lunhou fault are also active or both. |
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