- 學位論文
臺灣東部和平地區剪動構造與其地質意義之關係
The Shear-sense Structure and It's Geological Significance on Ho-Ping Area, East Taiwan
摘要
臺灣東部和平地區位於歐亞板塊與菲律賓海板塊的碰撞點上，使此區域的大南澳片岩記錄了過去所受到的運動之變質及變形歷史。過去前人在大南澳片岩地區進行大區域的地質圖繪製，對地層分佈、構造型態及變質作用等進行解釋，但是多數對於大南澳片岩內之變質基性岩體形狀並未詳細的進行描述，更未透過此區域所分佈之岩體形狀來進行地質演化之探討，因此本研究希望能藉由變質基性岩體在和平溪上所出露的小型露頭來判斷可能生成的岩體形狀，進一步透過岩體形狀從而推論到此區域之構造，且由構造變化討論來推斷此區域地質之演化過程。 透過野外調查之葉理位態、構造變化、岩體接觸關係與薄片上的剪動指標、石榴子石與角閃石生成的狀態與構造的先後順序後，將變質基性岩體之岩體形狀進行模擬、區域分佈範圍與將所受構造運動過程之分為三期─D1板塊碰撞擠壓時期、D2因增積楔狀體過程導致板塊抬升、D3使岩體產生同斜構造，總共三期的構造變化導致最後岩體為朝西北伸向的向斜。
並列摘要
In Ho-Ping Area’s geological structure, people used to drawing the geological map, separating the layers, rocks or structure about the Tananao Schist. Because of the strain and rock shape in this site changed very much, researchers always estimate of the structure by theory. Also by mineral chemistry, geochemistry and fossil summarizing to know about the metamorphism of the Tananao Schist and the hole history. But about the shape of this metamorphism is still unknow. So in this study we hope to resolve about the shape of this metabasite and know what the process to be. In this study research by foliations, geological structures, the relationship of metabasite, green schist and marble and shear-sense on the micro-structure. We also make models of metabasite about the progressive deformation defined by three discrete stages: D1, D2 and D3. Separated two type of P-T environment change by garnet.