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題名 | Existence of the Chuochi Transverse Fault Reconfirmed in Southeastern Taiwan and its Tectonic Implication=卓溪橫向斷層再次證實存在於臺灣東南部與其大地構造之意義 |
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作者 | 林楳嶺; | 書刊名 | 中國地質學會會刊 |
卷期 | 42:1 1999.02[民88.02] |
頁次 | 頁69-84 |
分類號 | 353.4 |
關鍵詞 | 臺灣地質圖; 大南澳片岩; 玉里帶; 橫向斷層; 擠壓造山作用中張裂; Geologic map of Taiwan; Tananao schist; Yuli belt; Transverse fault; Synorogenic extension; |
語文 | 英文(English) |
中文摘要 | 新近出版的兩幅台灣地質圖,最主要的不同處之一, 為卓溪橫向斷層是否存在於 大南澳片岩區。 經由此次之詳細地質調查及作圖,發現玉里帶之指標層 - 斑點泥質片岩的 不連續分布,可以證實卓溪橫向斷層之存在。此外,航空照片亦展示明顯筆直的線狀構造, 恰好對照卓溪橫向斯尼之位里。 這近乎鉛直的斯層面:在本區的走向約為西北 - 東南。地 層的空間分布,尤其是斑點泥質片岩,指示( 1 )位移為左移的;( 2 )東北側相對於西 南側向上移動;( 3 )沿斯尼的走向離距最少為 7 公里;( 4 )垂直離距大約 3.5 公里 ;和( 5 )總斷距的範圍約在 2.5 至 4.5 公里之間。 圖解卓溪橫向斷層與其有關的一些 不連續面的結果暗示卓溪斯尼很可能在始新世之前業已活動,於上新世至更新世間蓬萊運動 時再次活動,並造成今日之地質輪廓。此外,這斷層活動範圍的大小和方向與上新至更新世 期間菲律賓海板塊相對於亞洲大陸板塊的運動以及其後伴隨中央山脈的剝蝕大社土是吻合的 。卓溪橫向斯尼為擠壓過程中伴隨發生的張裂構造,此為碰撞運動學上的一種表現方式。 |
英文摘要 | One of the major issues between the two editions of the Geologic Map of Taiwan is whether the Chuochi Transverse Fault (CTF) exists in the Tananao Schist terrain. Through the present detailed geologic mapping; CTF has been verified by the abrupt discontinuity of a 500 m thick spotted politic schist, a key bed in the Yuli Belt. Besides, the Fault can also be recognized from a straight lineament on an air-photo. The vertical CTF strikes roughly NW-SE in the present study area. From the stratal distribution, especially of the spotted politic schist, we estimate that (1) its horizontal displacement is mainly left-lateral; (2) its northeastern block moved up relative to its southwestern one; (3) its strike separation along CTF is at least 7 km; (4) its vertical separation is about 3.5 km; and (5) its range of the net slip is presumably about 2.5~4.5 km. The considerably large vertical component of the net slip estimation based on the presence of geologic discontinuities implies that CTF might have moved left-laterally prior to Eocene, and then was re-activated during the Plio-Pleistocene Penglai Orogeny forming the present geologic configuration. Besides, the scope and sense of CTF movements are at large consistent with the movements of the Philippine Sea Plate against the Asia Plate and subsequent exhumation of the Central Range since Plio- Pleistocene time. CTF represents one way of expression of the collision kinematics, the contemporaneous extension structures in the course of compression. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。