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題 名 | Bathymetric Ridges and Troughs in the Active Arc-continent Collision Region off Southeastern Taiwan: Discussion=「臺灣東南外海現今弧陸碰撞區之海底脊及海槽」之討論 |
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作 者 | 陳中華; 葉義雄; 陳正宏; | 書刊名 | 中國地質學會會刊 |
卷 期 | 35:4 1992.10[民81.10] |
頁 次 | 頁421-427 |
分類號 | 356.232 |
關鍵詞 | 外海; 弧陸; 東南; 海底脊; 海槽; 臺灣; |
語 文 | 英文(English) |
英文摘要 | Most recently Huang and Yin (1990) have presented 3.5 KHz seismic reflection echograms data to demonstrate that Marine units off southeastern Taiwan between 21° to 30° N can be divided into three bathymetric ridges and three troughs. They have suggested that the offshore Hengchun Ridge (HR), Southern Longitudinal Trough (SLT) and Huatung Ridge (HTR) are, respectively, the southern extensions of the onshore Hengchum Peinsula, Longitudinal Valley and Coastal Rang (Figure 1). They have also indicated that Chen and Juang (1986) and Chen et al., (1988) mis-correlated the troughs in their study of the seafloor physiography off southeastern Taiwan, and that the Southern Longitudinal Trough (STL) could be connected with the North Luzon Trough between 21° 50' and 22° N (Figure 2). Actually, this mis-interpretation has firstly pointed out by Chen (1989). In his Ph D. dissertation, Chen discussed the tectonic model of southeastern Taiwan offshore between 22° N and 23 ° N and its implication for the evolution of the Coastal Range (Figure 3). He clearly showed that the North Luzon Trough might correspond to Zone II in Figure 3 (as Taitung Trough, or D in Figure 2).The names of each of the physiographic provinces given by Chen and Juang (1986) (Figure 2) were not followed, because he had different thoughts on the seafloor segments and their relationships to the onland geological units (Figure 3). The idea was presented by Chen et al., (1989) and published recently (Chen et al., 1990b). Comparing Figure 1 (Huang and Yin, 1990) with Figure 3 (Chen, 1989; Chen et al., 1990b), there is no major difference in seafloor physiography between these two independent studies in the offshore area of southeastern Taiwan between 22° N to 23° N, although they interpreted differently the relationship between the offshore units and the onland geological elements of eastern Taiwan. By examining constraints such as free-air gravity anomaly, magnetic anomaly and focal mechanisms of earthquakes in addition to the seafloor physiography, Chen (1989) and Chen et al., (1990 b) proposed a different way of correlating offshore units and geological elements of eastern Taiwan, namely three zones of seafloor physiography from east to west relative to the geological elements of the island of Taiwan: 1.Zone III is the Lutao and Lanhsu Volcanic ridge which may be equivalent to the volcanic ridge of the Coastal Range. This is supported by the observations that the chemical |
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