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題 名 | Magnetic Fabric Analysis of Late Neogene Houkuchi Sedimentary Sequence, South-Western Taiwan and Its Tectonic Implications=臺灣南部新第三系晚期後掘溪沈積岩系的磁性組構分析及其構造上之意義 |
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作 者 | 李德貴; 洪崇勝; | 書刊名 | 中國地質學會會刊 |
卷 期 | 36:1 1993.01[民82.01] |
頁 次 | 頁1-14 |
分類號 | 356.232 |
關鍵詞 | 沈積岩系; 南部; 後掘溪; 晚期; 新第三系; 磁性組構; 臺灣; |
語 文 | 英文(English) |
中文摘要 | 本文共分析採自後堀溪111個點址為數共935根之沉積岩岩樣,從分析每個點址岩樣的磁感率不均向性橢球體中,共有五種不同型式的磁性組構被確認:(a)主要最小磁感率軸(Kmin)十分聚集於沉積時基底面的法線方向上,而另兩個主要磁感率軸均勻地分佈於水平面上;(b)與前一型式相同的主要最小磁感率軸聚集情形,但另兩個主要磁感率軸亦各自分別集中於層面的不同方向上;(c)只有主要最大磁感率軸(Kmax)十分聚集於沉積時層面上,而其他兩個軸則分佈成一個垂直於它的帶狀區域;(d)主要最小磁感率軸十分聚集於以低角度與層面斜交的方向上,而其他兩個軸則分佈成一個垂直於它的帶狀區域;(e)主要最大磁感率軸十分聚集於沉積時基底面的法線方向上。 除了型式(a)屬原始沉積組構,可能僅受成層時之壓實作用外, 其他四種型式的磁性組構主要均受到大地構造運動之影響,且型式(b)演進到型式(e),表示受到古壓縮應力逐漸加深之現象。從這四種磁性組構中,可確認出兩種不同的古主壓縮應力方向,其一集中於070-090方向,主要紀錄在早於上新世晚期的點址上;而另一則集中於100-120方向,主要紀錄在晚於上新世晚期的點址上,亦可發現於較老的點址上。後者與我們在曾文溪剖面發現的結果十分一致,這種區域性古應力的方向變化,我們認為與臺灣附近地區菲律賓海板塊與歐亞板塊間的碰撞現象息息相關。 |
英文摘要 | A total of 935 sedimentary rock samples collected from 111 sites along the Houkuchi section were studied. Five different types of magnetic fabric were identified by analyzing the ellipsoids of magnetic susceptibility anisotropy of samples after tilt correction at each site: (a) The minimum principal axes, Kmin, are well-grouped around the pole of the depositional basal plane with the other two axes scattered in the bedding plane. (b) The same phenomenon was found for the Kmin axes, however, the other two principal axes are also well-grouped in the bedding plane respectively. (c) Only the maximum principal axes, Kmax, are well-grouped in the bedding plane and the other two axes forming a girdle to be normal to it. (d) Instead of the Kmax axes in type c, the Kmin axes are well-grouped with low angle inclined to the bedding plane and the other two axes forming a girdle to be normal to it. (e) The Kmax axes are well-grouped around the pole of the depositional basal plane. Except for type-a which was sedimentary in origin and probably due to compaction only, the other four types of magnetic fabric were mostly due to tectonics and indicate the progressively increasing effect of the paleo-compressional stress from type-b to type-e. Two different directions of the paleo-compressional stress, σ��, could be identified from these four types of magnetic fabric. One is about in the 070-090 direction mainly recorded at those sites with an age older than late Pliocene and the other is around the 100-120 direction appearing at almost all those sites with an age younger than late Pliocene and some older sites. The 100-120 direction is also very consistent with what we have found from the Tsengwenchi section. Such regional directional change of the paleostress is considered to be related to the collision of the Philippine Sea plate and the Eurasian plate near Taiwan area. |
本系統中英文摘要資訊取自各篇刊載內容。