摘要:
以区域地质、地震等资料为基础,系统研究了台西盆地乌丘屿凹陷构造特征及其形成演化。台西盆地的发育受欧亚板块、印度板块、太平洋板块和菲律宾海板块4大板块共同作用的影响。中生代晚期,台西盆地区域应力场从挤压转为松弛,地壳拉张减薄。新生代初期拉张形成裂谷,乌丘屿凹陷是在此背景下发育而成东断西超的半地堑式陆缘断陷。乌丘屿凹陷的构造发育与演化过程,可分为4个阶段,分别为中生代晚期的裂前阶段、古新世至渐新世的断陷阶段、中新世的坳陷阶段和上新世至第四纪的区域沉降阶段。
Abstract:
In this paper, regional geology and seismic data are studied for Cenozoic structures and tectonic evolution of the Wuqiuyu Depression of the Taixi Basin. The tectonic evolution of the Taixi Basin is affected by the interaction of the Eurasian Plate, Indian Plate, the Pacific Plate and the Philippine Sea Plate. In Late Mesozoic, the regional stress field of the Taixi Basin changed from compression to extention, and the crust became thinning, that resulted in the early Cenozoic extensional rift of the Wuqiuyu Depression, a half-graben marginal rift basin bounded by fault in the west and overlapping in the east. The tectonic evolution of the Wuqiuyu Depression may be divided into four stages, i.e. the pre-riftig stage of Late Mesozoic, the rifting stage from Paleocene to Oligocene, the depression stage of Miocene and the sedimentation stage from Pliocene to Quaternary.
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