楊燦堯2006-07-252018-06-282006-07-252018-06-282004http://ntur.lib.ntu.edu.tw//handle/246246/11836台灣位處於歐亞大陸板塊與菲律賓海板塊 的交界上，兩個板塊不斷的擠壓、碰撞，使得台 灣島上斷層密佈。過去台灣研究斷層的方法大多 是以地球物理、槽溝開挖或是以構造的觀點等來 進行模擬、確認；鮮少利用地球化學探勘的方法 來進行。本研究針對台灣西南部的活動斷層-潮 洲斷層進行土壤氣體的研究並同時配合地質、地 球物理與地形資料一同來探討相互間的關係。 一般說來，空氣成份與源自於地殼深處的氣 體成份截然不同，而地殼深部氣體會藉由擴散作 用逸散至地表，與土壤中之空氣成份達成平衡， 致使土壤氣體與空氣組成有些微差異；若是地表 底下有深的斷層抑或是破裂帶，可成為一個通 道，使地底深處之氣體可從地殼或地函處沿著此 路徑向上遷移，而使得地表土壤氣體產生異常的 濃度變化。利用此方法可快速獲得資料且花費 低。結果顯示土壤氣中所含之氦氣與二氧化碳濃 度，在潮洲斷層地區每條剖面特定的位置處，皆 有異常值出現。顯示本地區之斷層和破裂帶為一 南北走向的分佈，與報導中的潮洲斷層分佈位置 吻合；此外，由本研究結果推論，除了潮洲斷層 之外，應當還有許多南北平行走向的斷層與破裂帶分佈於本區域內。Taiwan is located on the boundary between Eurasia plate and Philippine Sea plate. The on-going collision between these two plates makes Taiwan densely faulted. So far most of the researches for the active faults in Taiwan are based on geophysical techniques, trench studies and structure geology, and geochemical methods are rarely used. In this work, the soil-gas compositions are measured and synthesized to compare with the geological, geophysical and geomorphological information along the Chao-chou Fault, which is considered as an active fault in southern Taiwan. The geochemical method using soil gases is based on the principle that faults and/or fractures are conduits which may provide high permeability pathways for deep source gases migrating upward to the surface, and that deep crust or mantle can produce anomalously high deep source signatures for some gases that are distinctive from those already existed in the overlying soils. Through this method, data can be collected rapidly with low cost. Preliminary results show that helium and carbon dioxide concentrations in the soil gas reveal anomalous values for specific positions along each of the transverses to the Chao-chou Fault. It indicates that the N-S trending, geochemically anomalous lineation corresponds to the reported trend and pattern of the Chao-chou Fault. Besides, several N-S trending fractural structures distributed in this area are also suggested.application/pdf323674 bytesapplication/pdfzh-TW國立臺灣大學地質科學系暨研究所土壤氣潮洲斷層soil gasChao-chou faultreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/11836/1/922116M002003.pdf