https://scholars.lib.ntu.edu.tw/handle/123456789/37139
標題: | 台灣及鄰近地區隱沒與碰撞作用─(子計畫九)臺灣及鄰近地區之變形模式 | 其他標題: | Deformation Mechanism of Collisional Mountain Belt around Taiwan | 作者: | 盧佳遇 | 關鍵字: | 新構造運動;西部前陸衝撞帶;砂箱模型;neotectonics;western Taiwan;sandbox | 公開日期: | 1998 | 出版社: | 臺北市:國立臺灣大學地質科學系暨研究所 | 摘要: | 台灣的中央山脈是一個彎曲的造山 帶。造成山脈彎曲的現象,主要是因為板 塊的斜聚合或是有剛性地塊嵌入的結果。 在板塊斜聚合或是有剛性地塊嵌入的過程 中,首先會在板塊的前緣造成許多衝上斷 層的堆疊,使地殼加厚造成擠壓的阻力增 大。部分的岩石因此不能向前堆疊,而藉 由平移斷層和正斷層向兩旁旋轉或推移造 成逃脫構造)。逃脫構造主要的特徵有: 1 ,地殼向兩旁拉張造成的拉張盆地。2 , 非常密集的平移斷層使山脈有分節錯動的 現象。3 ,局部擠壓的構造,伴隨著兩旁 下沈的前陸盆地等。台灣西部許多大型構造即顯示了擠壓構造與逃脫構造的特徵。 Experimental modeling allows description of the development and kinematics of structures in mountain belts formed during oblique convergence. In the collision geometry of the Taiwan mountain belt, the Chinese continental margin is oriented about N60 ‧, whereas the N16 ‧ Philippine Sea plate backstop is moving toward the Eurasian plate in a N55 ︱ direction. In addition to this oblique convergence mechanism, most of the foreland structures are strongly influenced by the shape of the backstop and structural highs. Sandbox experiments have been conducted to simulate the neotectonics of western Taiwan. The kinematics of deformation comprises a combination of compression and rotation, which results in a local partitioning between thrusting and strike-slip movements. The results of specific analog models demonstrated that: (1) most of the tableland structures in the western Taiwan, such as the Tatu, Pakua, Chungchou and Chia-Yi tablelands can be interpreted as a hinge part of drag anticline formed by fault-propagating fold process; (2) most of the basin and plain structures in the western Taiwan, such as Taichung and Chianan basins, can be interpreted as a part of piggy back basins; (3) the frontal thrust may have the first appearance of rupture in front of and between the Peikang high and the Kuanyin high; (4) NW trending link faults may be developing within the transfer zones; and (5) an escape structure formed to the south of the Peikang high can be correlated with bathymetric map and models. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/11703 | 其他識別: | 872116M002003 | Rights: | 國立臺灣大學地質科學系暨研究所 |
顯示於: | 地質科學系 |
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872116M002003.pdf | 24.97 kB | Adobe PDF | 檢視/開啟 |
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