本研究的目的在於探討膨潤石-伊利石礦物相轉變與觸發斷層活動之機制的關係，我們選擇大尖山斷層(即車籠埔斷層南段)的兩處露頭—桶頭剖面與加走寮溪剖面，透過中視尺度斷層帶調查與測繪，配合中視及微視尺度斷層帶組構之觀察及利用X光繞射分析量測斷層帶內黏土礦物含量之變化。
研究結果顯示，大尖山斷層造成斷層上盤的地形高聳而陡峭，斷層上盤的線型分佈的範圍約2公里寬，其間發育眾多的崩塌地，提供大量鬆散的土石材料。在370公尺寬的桶頭剖面以及350公尺寬的加走寮溪剖面中，各辨識出14條及4條剪裂帶分佈於斷層帶中，部分剪裂帶之核心存在類似軟質沈積物變形之脫水構造。本研究在桶頭剖面共採取了68個標本，加走寮溪剖面共採取22個標本，黏土礦物組成及膨潤石╱伊利石混層礦物之混層比分析結果顯示，隨著岩體剪裂程度的提高，伊利石含量提高，膨潤石含量降低，綠泥石含量略微提高。
將含脫水構造及斷層泥之標本與黏土礦物X光繞射分析結果比對後，發現其黏土礦物組成與膨潤石-伊利石礦物相轉變之趨勢一致，顯示斷層作用有助於膨潤石-伊利石礦物相之轉變，因此提出斷層帶發育模式：斷層活動使膨潤石脫水產生超額孔隙壓，斷層活動後，新生成的伊利石使斷層帶岩體強度增加，因此下一次斷層活動便在它處產生新剪裂帶，如此週而復始，便形成目前所見剪裂帶遍佈的斷層帶。

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