高校地质学报2018，Vol.24Issue(1)：77-87,11.DOI:10.16108/j.issn1006-7493.2017061
二连盆地中生代构造变形主控因素:物理模拟与讨论
Major Controlling Factors of the Mesozoic Tectonic Deformation in the Erlian Basin:Physical Simulation and Discussion
摘要
Abstract
The Erlian Basin is a Mesozoic oil-and gas-bearing basin in northeastern China. There are significant geometric and kinematic similarities between the Erlian Basin and other Mesozoic rift basins in eastern China.According to the tectonic line of the basin and the structure observed from the typical seismic profiles,the Erlian Basin consists of a central forward rift zone and peripheral diagonal rift zones. Although a considerable amount of research has been carried out on the pre-tectonic control of the Mesozoic deformation of the basin,the contemporaneous tectonic controlling factors remain unclear.In this study,three planar sandbox models were designed to determine the major controlling factors by changing the extension rate, the extension direction, and the syn-sedimentation.The results showed that the extensional direction controlled the internal fault characteristics of the rift.The ability of the extension direction to control the fault characteristics increased with distance from the rift boundary. The rate of extension changed the expansion of the weak tectonic zone and the scale of fracture development.Larger extension rates could lead to a larger and more complex fracture system. The syn-sedimentary action promoted the activity of the underlying slip-off layer, inhibited the growth of the boundary fault,and thereby reversely promoted the development of internal secondary fractures.The experimental results also showed that the extension direction was the major controlling factor of the tectonic deformation of the basin.The syn-sedimentation and extension rate were the secondary controlling factors.Additionally,according to the geometric and kinematic similarity of typical Mesozoic rift basins in eastern and adjacent areas of China,the study suggested a"southeastward extension"as a possible kinematic mechanism for the basin.关键词
二连盆地/物理模拟/中生代/伸展构造/控制因素Key words
Erlian Basin/physical simulation/Mesozoic/extensional tectonics/major controlling factors分类
天文与地球科学引用本文复制引用
徐强,徐凤银,赵岳,赵欣,侯涛,王建新..二连盆地中生代构造变形主控因素:物理模拟与讨论[J].高校地质学报,2018,24(1):77-87,11.基金项目
国家973项目(2015CB453000) （2015CB453000）
中国地质调查局地质调查项目(12120115009801)联合资助 （12120115009801）
