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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5617


    Title: 地震斷層作用後的流體滲透作用: 檢視車籠埔斷層南投井斷層岩之化學及礦物組成;Fluid infiltration after seismic faulting: examining chemical and mineralogical composition of the fault rocks in the drilling cores form Nantou well of the Chelungpu fault
    Authors: 盧崇賓;Chung-Bin Lu
    Contributors: 應用地質研究所
    Keywords: 流體;車籠埔斷層;isocon method;fluid
    Date: 2004-07-13
    Issue Date: 2009-09-22 09:58:14 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 流體是影響斷層破裂帶演化非常重要的因素。本研究以車籠埔斷層南投井岩心為對象,採用X光繞射分析與X光螢光分析等定性定量方法來鑑定斷層帶中各岩石與圍岩的化學成分及礦物組成,配合岩象觀察,比較破裂帶與圍岩間化學成分與礦物相轉換的情形,模擬斷層作用中可能產生的化學反應,探討流體在重複發生的地震事件之中所扮演的角色。 由XRD亂向分析(一般礦物)及岩象觀察的結果,得知南井岩心樣本內主要的組成礦物為石英、長石、雲母、方解石等。透過偏光顯微鏡觀察樣本內微構造的發展,發現破裂帶中石英顆粒較圍岩中破碎,這是應力作用集中的結果。而且破裂帶中裂隙與岩脈發達,這些岩脈主要是由一些順向排列的絹雲母及其他更細小的黏土礦物所組成。 本研究之黏土礦物半定量分析結果指出,南井岩心主要由淺海相環境的錦水頁岩組成,所以伊萊石的含量最豐。在四個斷層帶中,各黏土礦物的變化趨勢為伊萊石及高嶺石越接近斷層中心,其相對含量呈現增加的趨勢;綠泥石與蒙脫石則減少。推論當酸性流體長時間通過斷層帶時,會造成蒙脫石轉變成高嶺石,其反應方程式如下: 在假玄武玻璃中黏土礦物的含量很低,可能是受到脫水作用影響,或是受到斷層作用產生的高溫而被破壞。 XRF全岩分析主要在於觀察樣本內10種主要與次要元素的變化狀況,並配合等值線圖(Isocon diagram)來比較斷層帶與圍岩間化學成分變化的情形。等值線圖是以葛瑞生方程式(Gresens’ equation)為基礎,可以清楚的表現礦物經蝕變作用之後與原始成分對比的關係,並可演算斷層帶與圍岩間質量與體積變化的百分比。本研究以 TiO2含量為難溶性元素參考值,所得到斷層帶的體積變化關係呈現縮減的趨勢,代表車籠埔斷層的變形行為屬於壓縮作用。從各個斷層破裂帶的平衡方程式可以知道,消耗最多的化學成分是SiO2,其次是CaO、Na2O與K2O。至於斷層帶中獲得的元素為Al2O3、Fe2O3、MgO,與黏土礦物在斷層帶中的含量增加有關。 We defined four fault zones in the depth from 110 to 182m for the southern drilling core of the Chelungpu fault. The following methods are used in the study: X-ray fluorescence analysis (XRF), X-ray diffraction analysis (XRD), Petrographic observation and Isocon method. By integrating the XRD, XRF and petrographic data, we have derived some chemical reactions to explain the chemical input and output between altered rocks and their protoliths. Results of semi-quantitative XRD analysis show that kaolinite increases while montmorillonite decreases from undamaged rocks to seriously faulted rocks. From the whole-rock analyses, SiO2 gradually decrease while Al2O3, Fe2O3 and MgO increase from undamaged rocks to seriously faulted rocks. Volatile contents (LOI and CO2) are increased 1~4 times as high in the pseudotachylite compared to the standard host rock. In the Chelungpu fault zone, we use TiO2 as the immobile reference. A prominent volume loss process possibly caused by mechanical compaction is suggested by chemical isocon analysis. The gradual changes in chemical and mineralogical compositions from undamaged rocks to a fault center is probably due to fluid infiltration after seismic faulting.
    Appears in Collections:[應用地質研究所] 博碩士論文

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