研究生: |
黃楚琳 |
---|---|
論文名稱: |
花蓮和平地質區延性構造的地球物理探勘 |
指導教授: | 鄭懌 |
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: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 66 |
中文關鍵詞: | 甚低頻電磁法 、台灣東部 、花岡岩 |
論文種類: | 學術論文 |
相關次數: | 點閱:114 下載:5 |
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這十幾年來,台灣東部的巨大片麻岩體被認為是傳統的變質帶岩體。有些研究提出變質岩體被偉晶花崗岩切斷或是入侵。但是,越來越多的證據表示片麻岩可能是來自於花岡岩或變質花岡岩。為了驗證花岡岩與變質花岡岩的存在,及找出在台灣東部的變質帶中花岡岩潛在分布,使用甚低頻電磁法(very low-frequency electromagnetic method,以下簡稱VLF-EM ),在台灣東部造山帶,花蓮和平地質區中,佈一條長達19公里、曲折延綿的和平林道測線,以及一條作為對照組、長4.4公里的和平溪測線。
VLF-EM的數據使用一種稱為Fraser濾波法的線性濾波法,以及總體經驗模態分解法(ensemble empirical mode decomposition,或稱EEMD)非線性濾波技巧,以加強訊號以及判斷訊號品質。此外也使用加了集膚深度要素的Karous-Hjelt 濾波法,繪製等效電流密度模型。搭配3D地形協助,可以很清楚地使用等效電流密度模型,標示探勘區域的花岡岩與變質花岡岩的分布。
即使定性模型有不確定性,我們發現的地質意義將提供一個有關於台灣附近的版塊構造的看法──台灣與鄰近琉球島弧系統南端在晚新生代時,與呂宋島弧碰撞之前,是歐亞大陸邊緣的一部分。
本論文已部份發表於Journal of Applied Geophysics (2012), http://dx.doi.org/10.1016/j.jappgeo.2012.06.010
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