摘要
台湾海峡位于两个不同的构造单元之间。能反映台湾海峡基底的是居于海峡中部澎湖群岛中的花屿,系由变质岩和酸性火山岩所组成,它的岩性颇与福建东部的基底岩系和中生代火山岩相似。基底上复盖着较厚的上第三系和第四系,则与台湾西部可以对比,而福建东部却缺失上第三系。因此可以认为,台湾海峡在中生代晚期是福建古陆的一部分;到了新第三纪,它与台湾西部平原有着相同的地质发展过程。鉴于台湾浅滩和海峡海底有中新世大陆动物化石,而且海峡中普遍有上新世沉积,台湾海峡的形成时代是在中新世末或上新世初。从海峡两侧和海峡中排布着几条NNE向的断裂看,大致可以认为,台湾海峡的形成是断裂活动的结果。
The Taiwan Strait lies between two different structural units with bed rock resembling the eastern part of Fujian Province.Judging from the upper rock stratum of the bed-rock,it has passed through the same prccesses of geological developments as the western plain of Taiwan.The Taiwan Strait came into being at the end of Miocene Epoch as the result of faulting activity.In the Quaternary period,due to the growth and decline of glaciers,changes on the sea surface took place.The fact that Taiwan has been linked and seperated from Fujian for four times can be proved by many evidences cited in this treatise.
作者
赵昭昞
Zhao Zhaobing(Department of Geography,Fujian Normal University)
出处
《台湾海峡》
CAS
1982年第1期20-24,共5页
Journal of Oceanography In Taiwan Strait
