台灣的地熱系統分為火山型及非火山型兩種，其中，宜蘭仁澤－土場地區地熱系統屬於非火山型；發達的斷層與岩層裂縫作為地表天水滲流及地下水流通管道，加上地下高溫岩體作為熱源，使其富有再生能源開採價值。該地區大地構造由碰撞造山進入弧陸碰撞－弧後張裂轉換帶，經過多期變形產生複雜構造，而斷層及破裂帶的類型及走向與區域構造息息相關，因此建立區域地質構造模型對於地熱資源開發相當重要。過去尚無前人針對此區域進行中視尺度地質構造演化研究，且鑽井資料無法提供破裂之種類及方向。本研究進行仁澤－土場地區地表地質調查，於野外量測岩層的層面、劈理、以及破裂面之位態，記錄溪谷沿線岩性變化以及破裂面種類，建立本區域的地質構造模型，並根據不同構造之間的截切關係，判斷其發育順序，以探討區域構造演化及其在地熱系統扮演之角色。
經過調查發現當地層面位態為東北－西南走向、高傾角，岩性為板岩及變質砂岩，兩者比例多變。大多數露頭所見劈理面與層面平行，少數夾低角度。此外，在多處劈理面上可觀察到與劈理走向近乎平行之擦痕。節理在兩種岩性的岩層皆存在，根據傾角大小分為兩個類型，剪切破裂則根據滑移方向分為四個類型。藉由伴隨斷層產生之次要雁形破裂型態、斷層剪裂帶岩體旋轉方向，得知斷層滑移方向與斷層面走向近乎垂直。由於斷層面上所記錄擦痕之走向與斷層面走向接近平行，表示此斷層曾經產生多期不同方向的滑移。
研究結果顯示本區域至少經過四期構造活動。第一期在岩層尚未變質時發生，於砂岩內部形成兩組約夾70度角的節理；第二期為受到西北－東南向擠壓，形成一系列緊密褶皺，並產生平行層面之劈理；在岩層抬升過程，變形行為由塑性轉為脆性，以形成斷層泥之斷層作用為代表，且形成西北－東南向、平行主應力方向之節理以及東北－西南向剪切破裂，為第三期變形。此後仁澤－土場地區造山運動逐漸式微，區域應力場逐漸改變，岩層受左移剪力作用，產生數個小型斷層，以及沿舊有劈理及斷層等力學弱面產生近平行走向之滑移，遂產生與弱面走向平行之擦痕，為第四期活動。

In Taiwan, there are few locations being identified as potential area for geothermal energy development, which can be grouped into two types: volcanic-related and non-volcanic-related. Jentse-Tuchang geothermal area is categorized as one of the latter type. Fractures and faults in rock mass underground serve as fair fluid conduit, and the heat remaining in metamorphic rock is good source of energy. To find appropriate sites for geothermal wells, it is important to realize the orientation and distribution, also development sequence, of those ruptures. This study investigates outcrops along the Tienkuerh and Towang rivers, describes lithology distribution and structure mode, and constructs a regional geological structural model with CPC geothermal well data. The rock formation in the study area is a part of the Lushan formation. Fieldwork results show that the rock formation in study area consists of slate and metamorphic sandstone. Bedding and cleavage are almost parallel, which strike NE-SW. Fractures are divided into joints and shear fractures by characteristics of fracture surfaces. There are several faults, two of them outcrop in both rivers, while the others are only found in single river. Striations on bedding, cleavage and fracture surfaces indicate that structural kinematics of the last stage are strike-slip. By analyzing the cross-cutting relationship and comparing structural mode with tectonic events, there are four stages of structural activities in this region. First, joints in sandstone were formed before metamorphism took place. When the rock formation was buried and compressed during the most recent orogeny, folding, metamorphism and cleavage developed simultaneously. When the orogenic belt started to uplift subsequently, deformation behavior of rock turned from ductile into brittle one, and fractures and faults with fault gouge started to develop. With the change of regional stress field, orogeny came to the final stage, and the rock formation was imposed with sinistral stress, forming near horizontal striations consequently.

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