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1 前言台湾东南岸外区域是亚洲大陆、南海和菲律宾海三个活动板块间相互作用形成的(图1)。虽已知台湾东部地质构造是弧-陆碰撞的结果,但我们至今对台湾东南岸外海洋地质了解甚少,甚至对现今海底地貌构造单元的特征亦知之甚少。海底地貌构造单元的方位和海底地形应当反映某一地区海洋地质的基本特征,尤其是象台湾那样的活动构造区(图2)。为了更好地了解台湾东南岸外复杂的弧-陆碰撞地质,须精确测定该区海底海脊和海槽的展布及方位。
1 Introduction The southeastern coast of Taiwan is formed by the interaction of three active plates in the Asian continent, the South China Sea and the Philippine Sea (Figure 1). Although it is known that the geological structure in the eastern part of Taiwan is the result of an arc-continent collision, so far we have very little knowledge of marine geology outside the southeast coast of Taiwan, and even little is known about the characteristics of today’s structural units of the submarine geomorphology. The azimuth and seafloor topography of the structural units of the submarine geomorphy should reflect the basic characteristics of marine geology in a particular area, especially the active tectonic zones like Taiwan (Figure 2). In order to better understand the complex arc-continent collision geology outside the southeast coast of Taiwan, the distribution and orientation of the seabed ridges and troughs in the area must be precisely measured.