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頁籤選單縮合
題名 | Fault Tectonics of the Coastal Range, Eastern Taiwan=海岸山脈之斷層構造分析 |
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作者姓名(中文) | 林慶偉; 劉彥求; 賴文基; 鄭文弘; | 書刊名 | 中國地質學會會刊 |
卷期 | 42:3 1999.08[民88.08] |
頁次 | 頁429-446 |
分類號 | 353.4 |
關鍵詞 | 弧陸碰撞; 斷層擦痕分析; 變形; 海岸山脈; Arc-continent collision; Fault-slip analysis; Deformation; Coastal range; |
語文 | 英文(English) |
中文摘要 | 台灣東部的海岸山脈為歐亞大陸邊緣的外來地質單元。它為菲律賓板塊上的呂宋 島弧與歐亞大陸板塊斜碰撞作用下之的產物。本研究由海岸山脈195個測站,量測超過3800 筆斷層擦痕資料逆推得知本區之古應力狀態。其結果顯示本區之最大主應力接近水平,其方 位分佈的範圍在方位角90°-150°間,且其集中點在方位角127°的位置。此結果與由板 塊運動推得之現今應力狀態相似。然而詳細檢視本研究逆推得到的古應力資料,不同類型的 應力狀態仍可區別,且其可對應到海岸山脈演化的不同階段。都巒山層中記錄之伸張變形反 應的是隱沒階段或碰撞階段早期之變形,最大主應力在方位角140度之壓縮變形反應的是碰 撞階段或加積階段初期之變形,最大主應力在方位角120度之壓縮變形反應的是加積階段且 島弧完成順時針20-40度旋轉後之變形。 |
英文摘要 | The Coastal Range in eastern Taiwan is an exotic terrane along the Asian Continental Margin. It was formed by an oblique collision between the Luzon volcanic are of the Philippine Sea plate and the Asian continent. Substantial fault-slip data were collected from 195 stations in the Range for determining the type and amount of structural deformation. Inversion of fault-slip data shows that σ is nearly horizontal with the azimuth ranging between 90°-150°; the median σ plot has a trend of 127°. This is consistent with the results derived from the present-day plate motion. However, through detailed investigation, different stress states can be differentiated. They were correlated with different evolutional stages of deformation of the Range. The extensional events recorded in the Tuluanshan Formation probably represent the deformation during subduction or at an early stage during collision. The first compressional event withσ of about 140° represents deformation during the collision stage. The second compressional event with σ of about 120° represents deformation during the accretion stage, after the volcanic arc rotated 20°- 40°clockwise. |
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