論文內容提要：
1999年9月21日凌晨，台灣中部發生規模7.3級之世界級災害性地震，造成地表長達80公里的破裂。集集地震雖然造成無數的傷亡損失，卻也提供了我們瞭解斷層行為與性質的珍貴機會。
本研究分為兩個主要目的：一是觀察車籠埔斷層之斷層破裂帶，以瞭解這次地震斷層活動對地表淺部岩層所造成的破裂構造特性與斷層泥的性質；另一是比較斷層泥與圍岩之黏土礦物成份，討論在這次斷層活動的過程中，斷層泥中之黏土礦物是否受到應變作用影響而產生化學變化。
李錫堤（2000）沿車籠埔斷層地表破裂帶進行HQ連續取樣鑽探工作，其中鑽孔編號BH-2位於東陽橋附近，總鑽井深度為110公尺，並於深度50.5公尺處發現一寬約2～3公分的黑色斷層泥，依據地表破裂傾角及裂隙密度分析，判斷此處斷層泥為921地震車籠埔斷層滑動帶，斷層面傾角約50度至60度之間。2001年3月「車籠埔斷層深部鑽心及孔內試驗計畫」由日本出資，聯合台灣、美國及日本專家學者進行研究。鑽孔位置選在台中縣豐原市東陽里（鑽孔編號BH-1、BH-1A）及南投縣千秋里之千秋國小（鑽孔編號CLF-2），其中BH-1與BH-1A即為本研究岩心採樣之對象。
本研究之研究方法為：(1) 將BH-2、BH-1及BH-1A所有岩心拍照紀錄，以便日後進行細部構造描繪。(2) 觀察岩心之斷層岩變形組構，進一步將斷層角礫岩依破裂程度分類並描述，以瞭解地層受到斷層作用的破壞程度，並依此找出斷層滑移帶的可能位置。(3) 製作岩石薄片，以觀察斷層破裂帶的微構造及斷層泥之微組構。(4) 進行X- ray 繞射分析，以瞭解斷層帶與圍岩之礦物種類及黏土礦物含量差異。(5) 測量伊利石結晶度，以瞭解黏土礦物是否受到斷層作用影響而產生變質作用。(6) X光螢光分析（全岩分析），以瞭解斷層泥與圍岩中各元素之氧化物所含重量百分比。
研究成果：(1) 車籠埔斷層之斷層破裂帶大致沿著岩性軟弱的岩層或是岩性較不均質的軟弱岩互層發育，加上地下水的潤滑作用，因此容易產生滑動量大、破裂範圍大且構造複雜的斷層破裂帶。(2) 深度214～225公尺的斷層破裂帶之剪切應變作用集中在一狹窄滑動帶中，斷層滑動帶有強烈的半塑性剪切變形特徵（S-C組構之葉理狀構造）顯示，斷層核心應變程度較高，而斷層破裂帶範圍較小的現象。(3) 深度283～330公尺的斷層破裂帶寬度較大，斷層泥僅有顆粒磨細的作用並無葉理狀構造出現，顯示斷層核心應變程度較低，而斷層破裂帶範圍較大的現象。(4) 斷層泥組構已顯示黏土礦物與細礫石英會受到強烈剪應力作用影響而反應出定向的葉理狀構造。(5) 蒙脫石受到斷層作用產生的溫度影響而轉變為蒙脫石/伊利石混層礦物或伊利石。根據斷層帶溫度估計，過程中所排出的水很可能迅速氣化而逸散入孔隙中。(6) 斷層泥之最小顆粒可達到10～25nm，而一般頁岩（圍岩）之顆粒均在一百～數百nm以上，足見岩體本身的最小顆粒亦會受到斷層應變作用影響而減小體積為原來的千分之一大小。(7) 所有斷層泥的化學成分都十分相近，而圍岩則隨著礦物組成而異。

Abstract
Surface rupture of the Chelungpu thrust fault during the September 21, 1999, Chi-Chi earthquake extended 80-km long. Core analysis from a 450m-long inclined hole drilled through the fault zone at northern end of the Chelungpu fault is the main research in this study. Studies of deformation structure of fault rocks and microstructures of fault gouge from cores help to characterize shear localization and deformational behavior of fault zone. In addition, clay mineral analysis is performed to understand the relationship between clay composition and strain within slip zones.
We have identified two fault zones on which slip occurred during Chi-Chi earthquake: 1) depth 214~225m, few fractures in the core and fault gouge(223.45m) with S-C fabric show that no obvious damage zone is grown in the small fault zone and shear strain concentrates a narrow slip zone; 2) depth 283~330m, many large fractures filled with rich mud and fragments in the wide fault zone, but fault gouge(329.65m) with random texture show that damage zone and fault core are grown completely.
Results from X-ray diffraction analysis show that smectite and siderite coexist in host rock but not in the fault gouge. Smectite dehydration and transition to mixed-layered illite-smectite are caused by elevated temperature owing to fault slip during Chi-Chi earthquake. Temperature within slip zone can be constrained by the decompose temperature between siderite and calcite.

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