略论东海西南部和台湾海峡北部地质构造关系

在综合研究分析台湾中油公司有关台湾北部、西部海域地质构造的文章的基础上,结合中国海洋石油东海公司在该区所获资料,着重研究了所称东海陆架盆地和台西盆地间的地质构造关系.认为原称的台西盆地基本地质构造特点和东海陆架盆地相似,属同一体系.具东西分带的特点,即西带为古新世一始新世的断陷、断坳型沉积和中新世以后的披盖沉积.中间缺失渐新世沉积;东带为始新世及之前的断陷、断坳演化为渐新世一中新世的坳陷型沉积,上新世和第四纪才为披盖型沉积.二盆地间的观音隆起并不呈NW走向横卧其间,而是以NNE走向延展,和东海陆架盆地的渔山隆起、雁荡隆起的走向一致.因此,西带的乌丘屿凹陷也以NE向延展从属于东海陆架盆地西带左行雁行排列的构造体系.在西区不应是一个独立盆地,而是东海陆架盆地一部分.按该盆地中一级构造单元划分原则,可以把西带厦澎凹陷和乌丘屿凹陷合为一个坳陷,命名为厦门坳陷.东带新竹凹陷连同陆区台湾西海洋在内,独立称作新竹坳陷.二个坳陷间以观音一澎北隆起高带相隔.

ON THE GEOTECTONIC RELATION BETWEEN THE SOUTH-WESTERN PART OF EAST CHINA SEA AND THE NORTHERN PART OF TWIWAN STRAIT

Based on the literatures about geo-tectonic in the northern and western parts of Taiwan Strait and in combination of the data acquired by China Offshore Oil Donghai Corp. in the same region, the study is focused on the geotectonics of East China Sea Shelf basin and West Taiwan basin. It is suggested that the geo-tectonics of West Taiwan basin is similar to that of East China Sea Shelf basin and belonging to one system which is characterized by east and west zonations, i. e. the western zone being Paleocene-Eocene fault-subsidence, fault depression deposition and post Miocene draped sediments missing with Oligocene,while the eastern zone being prior Eocene fault subsidence and fault depression deposition to Oligocene -Miocene depression deposition where draped sediments occurred only after Pliocene and Quaternary. The Guanyin uplift inbetween the basins is not trending NW, but in NNE extension, which is generally in parallel with trend ofYushan uplift and Yandangshan uplift, therefore, the Wuqioyu sag is extending in NE direction, belonging to an echelon tectonic system in the west zone of East Sea basin. According to the principle of primary tectonic division, the Xiamen-Penghu sag can be classified into one depression with Wuqioyu sag, to be named as Xiamen depression. The Xiazhu sag in the east zone together with the west coast of Taiwan is named as Xiazhu depression. the two depressions are separated by Guanyin-North Penghu high.