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題 名 | Structural Features and Quaternary Tectonics of the Chinshan Fault, Northern Taiwan=金山斷層的構造特徵與第四紀活動 |
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作 者 | 朱健仁; 李錫堤; 鄧屬予; | 書刊名 | 中國地質學會會刊 |
卷 期 | 41:1 1998.02[民87.02] |
頁 次 | 頁25-42 |
分類號 | 353.4 |
關鍵詞 | 金山斷層; 構造地質; 第四紀大地構造; 北臺灣; Chinshan fault; Structural geology; Quaternary tectonics; Northern taiwan; |
語 文 | 英文(English) |
中文摘要 | 金山斷層斜貫臺灣北部,以往多被認定是一條逆斷層。在斷層兩端的金山及北投 地區,斷層的位置和性質,可以從第三系沈積岩的地層錯移加以判識,然而在金山及北投之 間,因為大屯火山岩覆蓋了第三系岩盤,岩層的錯動情形難以辨認,所以,斷層的位置及特 徵仍有許多爭議。為了解決這個問題,我們詳細調查了大屯火山區的地形及構造地質,收集 了許多新資料,並對於金山斷層的特性,有了一些新的看法。我們先以臺灣北部的線型分布 圖為基礎,以空照圖分析及野外調查,找出與金山斷層有關的構造線型,並繪製成圖,結果 發現所有的構造線型都位於一條東北—西南走向的狹長條帶內,這條帶由金山延伸至關渡, 長16公里,寬3.5公里,大抵平行一般所認知的金山逆斷層,顯示金山斷層在地表並非一 條斷層線,而是一個斷層帶。由斷層的擦痕及古應力分析資料,我們發現金山斷層的活動可 分成三期;第一期以逆斷層活動為主,其最大主應力方向是西北—東南;第二期以平移斷層活 動為主,其最大主應力方向為南—北,伸張方向為東—西;第三期以正斷層活動為主,其伸 張方向為南—北。第一期的構造活動,肇因於第四紀早期的碰撞造山運動,第二期與第三期 活動,則反應了第四紀晚期造山運動之後,山脈崩毀的過程。如今第三期正斷層的活動仍方 興未艾,因此,金山斷層的發震潛能不可忽視。 |
英文摘要 | Originally defined as a thrust fault, the Chinshan Fault of northern Taiwan can be readily recognized by the stratigraphic offset in the Tertiary sedimentary strata exposed in the Chinshan and Kuantu-Peitou areas. However, between Chinshan and Kuantu, it is mostly covered by the Quaternary Tatun volcanics, in which no obvious fault traces and stratigraphic offsets can be recognized. Seismological and structural geological studies show prominent wrench and extensional tectonisms in the Tatun volcanic area, which is not consistent with the thrust nature of the Chinshan Fault. Its location and character, hence, have remained a subject of conjecture and debate, especially in the Tatun volcanic area. To solve this problem, we examined the geomorphology and structural geology of the Tatun volcanic area in the hope of better understanding this fault. Based on a comprehensive map of lineaments extracted from the digital terrain model data, we delineated the minor faults in the Tatun volcanic area by aerophotos and field check. All the minor faults are distributed in a NE-SW trending zone stretching from Chinshan to Peitou. The zone is about 3.5 km wide and 16 km long, and generally parallels the surface trace of the alleged Chinshan Fault. It indicates that the present Chinshan Fault, as shown on the surface, is not a through-going fault but a zone of distributed minor faults. The zone encloses not only all the tectonic fractures but all the hydrothermal activities in the Tatun volcanic area. Most of the minor faults are oriented NE-SW, largely parallel to the enclosing fault zone. According to the detailed fault-slip and paleostress analysis, the Chinshan Fault has gone through three stages of deformation. The first stage involves reverse faulting in response to the NW-SE |
本系統中英文摘要資訊取自各篇刊載內容。