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根据地震反射和地磁资料的分析,我们发现台湾西部已被公认的盆地、陆地和断裂构造向海下延伸至台湾海峡大陆架。这些构造包括新店断层、台北断层、新庄断层、观音地块、新竹盆地、台中盆地、北港—澎湖基底高区,义竹边缘捩转断层和台湾南部盆地。向海延伸的方向呈扇状放射。东西走向的北港—澎湖基底高区作为一个构造坝把上第三系很厚的连续沉积拦截在台湾西北部。在本区已发现最大厚度的沉积。北港—澎湖基底高区周围许多断层的存在表明本区发生过构造运动。与平缓正磁力异常相对应的断层、褶皱沉积层和火成基底带,沿台湾西南部大陆架边缘分布。我们推断这个地带是台湾—突道褶皱带向西南的延伸。在台湾西部盆地和台湾海峡多半产生于台湾—突道—北港—澎湖构造坝形成以后。
Based on the seismic reflection and geomagnetic data analysis, we found that the western part of Taiwan has been recognized as a basin, land and fault structure that extends down to the Taiwan Strait continental shelf. These structures include the Xindian fault, the Taipei fault, the Xinzhuang fault, the Guanyin block, the Hsinchu basin, the Taichung basin, the Beigang-Penghu basement, the Yizhu margin and the southern Taiwan basin. The direction of the extension of the sea fan-shaped radiation. The east-west North Port-Penghu basement high-rise area acts as a structural dam to intercept thick continuous depositions of Upper Tertiary in the northwestern part of Taiwan. The maximum thickness of deposit has been found in this area. The presence of many faults around the Beigang-Penghu basement shows that there was a tectonic movement in this area. Faults, fold sedimentary layers and pyroclastic basalts corresponding to the gentle anomalous positive anomalies are distributed along the margins of the continental shelf in southwestern Taiwan. We infer that this zone is an extension of the Taiwan-Tugou belt to the southwest. Most of Taiwan’s western Taiwan basin and the Taiwan Strait came after the formation of the Taiwan-Zhuang-Bei Gang-Penghu structural dam.