张扭性断陷盆地的构造样式

STRUCTURAL STYLE OF A TENSO-SHEAR FAULT BASIN

以渤海湾盆地中南部胜利浅海探区为例,界定了张扭性断陷盆地内构造样式性质、类型,分析了典型构造样式以及主要特征。通过地质、地球物理综合研究,得出以下结论:(1)胜利浅海探区以张扭性断陷环境为主,构造样式受应力场和构造演化阶段控制,主要发育了伸展型、扭动性构造样式,还发育有以伸展为主的反转叠加构造样式;(2)伸展型构造样式可划分为翘倾断块、潜山披覆、重力背形、底辟背形等4类9种构造样式;(3)扭动型构造样式主要包括花状构造和雁列构造;(4)总结了张扭性断陷盆地内各类构造样式的特征和形成机制。

In order to study the properties and structural types of a tenso-shear fault basin,the Shengli Offshore Region of central-southern Bohai Bay Basin is selected as a case for geological and geophysical studies.Results show that（1） the region is dominated by a tectonic environment of tenso-shear fault subsidence.The structural style of the region is controlled by the stress field and tectonic evolution.Extensional,shearing,and reversal structural styles are developed in the region;（2） extensional structural style can be further divided into four categories of tilting block,buried-hill drape,gravity antiform,and diapir antiform and nine types;（3） shearing structural style can be divided to two categories of flower structure and echelon structure.In the end,the characteristics and mechanism of different structural types are summarized.