https://scholars.lib.ntu.edu.tw/handle/123456789/37537
標題: | 台灣車籠埔斷層鑽井整合型計畫─台灣車籠埔鑽井岩芯和流體的物理、化學性質和微生物 (I) | 其他標題: | Physical and Chemical Properties and Microbiologic Analysis of Core Materials and Fluids in the TCDP | 作者: | 宋聖榮 | 關鍵字: | 斷層岩石;車籠埔斷層;台灣車龍埔斷層 深鑽計畫;地質微生物;氣體連續監測 | 公開日期: | 2005 | 出版社: | 臺北市:國立臺灣大學地質科學系暨研究所 | 摘要: | 台灣車龍埔斷層深鑽計畫從2004 年初開鑽,至 2004 年底完成A 井2000 公尺的岩芯取樣,又從 2005 年5 月中旬完成B 井從950 公尺至1350 公尺 的鑽探和岩芯取樣。A 井的岩芯描述顯示,車籠埔 斷層深鑽共發現有六個主要斷層帶,由地表斷層露 頭和淺層震測結果、A 井溫度監測結果、井測資料和國立臺灣大學地質學系 在1111.29 公尺處發現有新鮮的假玄武玻璃,結 果顯示集集大地震的滑動帶位於1111.29 公尺左右 的斷層帶。斷層泥的黏土礦物組成主要是伊萊石、 高嶺土、綠泥石和膨脹土等。其中,在1111.19 ~ 1111.31 公尺處為黑色的超磨碎岩,其高嶺土和綠 泥石含量幾乎消失,伊萊石也大量減少,而膨脹土 則大量增加。由黏土礦物的熱破壞實驗,顯示921 集集大地震斷層帶中的摩擦溫度可能高於950 ℃。 從斷層帶內含有假玄武玻璃,且大部分都已轉變為 膨脹土,顯示造成921 集集大地震大位移的機制可 能為摩擦融熔和熱水壓作用所形成的。 We have finished drilling the TCDP hole-A which it has the cuttings from 0 to 431.34 m and cores from 431.34 to 2003.26 m deep in the end of 2004. Meanwhile, the Hole-B with a branch was cored between 950 m to 1350 m in May, 2005. At least six fault zones have been identified in the cores. Based on the surface trail of rupture, regional geology, shallow seismic reflection, well logging, thermal measurement and core examinations, the slip zone of 1999 Chi-Chi earthquake may be occurred in the black material of fault zone FZ1111 around the depth of 1111.29 m. It is composed of 12 cm thick ultracataclasites with slickenline. The XRD and TEM analyses show that the black materials consist of amorphous phase, pseudotachylyte and rich in smectite which reach as high as 85% of total clays. However, the smectite-rich gouges can not find in other parts of the FZ1111 and the other fault zones. The smectite-rich gouge may be resulted from the devitrification of pseudotachylyte, produced by frictional melting after the rapid slip of the seismic earthquake. Co-existences, thus, of pseudotachylyte and smectite-rich in the black materials of FZ1111 indicate that the mechanism of large displacement seismic faulting occurred in 1999 Chi-Chi earthquake may be due to the lubrication of thermal pressurization following the frictional melting. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/11872 | 其他識別: | 932119M002028 | 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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932119M002028.pdf | 222.94 kB | Adobe PDF | 檢視/開啟 |
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