研究生: |
許靖宜 |
---|---|
論文名稱: |
泰國西北部達府地區古應力之探討 |
指導教授: |
李通藝
Lee, Tung-Yi |
學位類別: |
碩士 Master |
系所名稱: |
地球科學系 Department of Earth Sciences |
論文出版年: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 88 |
中文關鍵詞: | 泰國 、達府 、應力 、構造 、王朝斷層 |
論文種類: | 學術論文 |
相關次數: | 點閱:185 下載:41 |
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西北-東南走向的王朝 (Wang Chao) 斷層切過中南半島地塊的西部,在泰國西北部的達府 (Tak) 地區,其剪切帶出露在藍山 (Lansang ) 國家公園,而在斷層帶北邊的普密蓬 (Bhumibol) 水壩附近則有CM-L帶的變質岩露頭。為了釐清此區域於不同變形時期中應力所造成的應變史,我們針對從藍山剪切帶及普密蓬水壩變質岩帶所採集的定向標本進行顯微構造分析。藉由測量葉理及葉理交軸之位態,以了解各變形期應力之結構。顯微構造觀察分析結果顯示此兩區各有三期的葉理構造,亦即各有三期的塑性變形,而且此兩區的塑性變形期是一致的。
第一期的變形作用中,主應力方向為東-西向的水平擠壓力,因此藍山剪切帶與普密蓬水壩變質岩帶均有南-北向的陡峭葉理產生,其可能為晚白堊紀到早第三紀之間,西緬甸板塊碰撞撣邦 (Shan-Thai) 塊體的造山運動所產生;第二期的變形作用中,主應力方向為東-西向水平擠壓力,因此在普密蓬水壩變質岩帶產生南-北向的褶皺,在藍山剪切帶產生了左移運動及西北-東南向的陡褶皺,其可能為漸新世時,印度碰撞歐亞板塊的造山運動所產生;第三期的變形作用中,主應力方向為鉛直的岩壓,因此在普密蓬水壩變質岩帶產生偃臥的褶皺,在藍山剪切帶產生近乎水平的葉理,其可能為漸新世之後,印度持續碰撞歐亞板塊使岩石圈增厚所導致。
此與 Tapponnier 等人 (1982) 所提出的「碰撞-脫逸地體構造運動」理論認為脫逸運動在陸塊內產生的變形很少之現象不符。與 Chung 等人 (1997 and 1998) 所提出的「碰撞-岩石圈增厚-岩石圈拆層-板塊張裂-地體脫逸」的地體運動模式有時序上不符之處,因為此區域觀察到的現象是先有左移運動之後才有岩石圈增厚的產生。
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