| 研究生: |
廖哲浩 Liao, Zhe-Hao |
|---|---|
| 論文名稱: |
中央山脈池南地區地質構造研究 A Study of Geological Structure in the Chinan area, Central Range, Taiwan |
| 指導教授: |
林慶偉
Lin, Ching-Weei |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 地球科學系 Department of Earth Sciences |
| 論文出版年: | 2011 |
| 畢業學年度: | 99 |
| 語文別: | 中文 |
| 論文頁數: | 80 |
| 中文關鍵詞: | 池南 、剪切帶 、結晶度 |
| 外文關鍵詞: | Chinan, shear zone, crystallinity |
| 相關次數: | 點閱:105 下載:9 |
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在台灣的地質分區中,中央山脈的東側可以區分為太魯閣帶及玉里帶。早期研究指出這兩個變質帶之間為一條斷層所分隔,為西側高溫低壓的太魯閣帶以及東側高壓低溫的玉里帶的分界,成東北西南走向。在已有文獻中,僅知在萬榮、銅門及新武地區有逆衝斷層出露,對於此一斷層的詳細情形尚未有詳細的記載。
本研究選定池南地區台14線公路龍澗-銅門段、木瓜溪河谷、荖溪河谷以及白鮑溪河谷進行野外地質調查,並採集標本進行伊萊石結晶度與綠泥石結晶度分析、鈉雲母存在指標分析及微視構造分析瞭解其運動型式,來判斷兩變質帶之間是否有構造存在。
研究結果顯示,在太魯閣帶及玉里帶兩變質帶間之韌性剪切帶為左移兼具逆衝的運動型式。伊萊石結晶度及綠泥石結晶度顯示在韌性剪切帶處有較好的結晶度。另外,僅在玉里帶中發現五個樣品含有鈉雲母,表示玉里帶壓力相較於太魯閣帶為高。
The central range of eastern Taiwan is proposed to be divided into a high-temperature/low-pressure Tailuko belt and a high-pressure/low-temperature Yuli belt by northeastern extending Shoufeng fault. Some previous studies have recognized the fault is a reverse fault or shear zone in Wanrung, Tongmen and Xinwu areas. However, the exact location is northern Central Range and the characteristics of the fault are still ambiguous.
In this research, Chinan area in north-central Range is selected as the study area. Observation of microscopic structures is used to identify the characteristics of the fault movement. Additionally, the illite and chlorite crystallinity determined by XRD are also used to help determining the location of the fault.
The study results show that there is a mylonite shear zone characterized by reverse motion with left-lateral strike slip component near the boundary of the Tailuko belt and the Yuli belt. The illite crytallinity index and chlorite crytallinity index all indicate the rocks in the shear zones have a better crystallinity. Additionally, the paragonite can only be found in five specimens sampled in the Yuli belt which implies that strata in Yuli belt have undergone a higher pressure than that in Tailuko belt.
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