摘要
以野外构造调查和地震解释等开展米仓山及周缘构造分析,系统总结了米仓山构造变形及展布特征,由北向南依次划分为隆起区、前缘断褶带和前缘凹陷带,其中隆起区包括基底隆起带和隆起边缘变形带两个次级单元;通过不整合面分析和低温年代学分析等手段,明确米仓山地区共经历了印支期以来6个构造演化阶段;结合区域构造背景,探讨了米仓山地区两组构造形成机制,东西向构造属于上扬子板块北缘由北向南挤压造山形成的两类构造楔共同作用的结果,北东向走滑构造和断裂属于龙门山和大巴山联合挤压作用产生的结果。
In this study, some Micangshan and surrounding tectonics are analyzed by means of field investigation and seismic interpretation. Both deformation and distribution of Micangshan tectonics are systemically summarized; and this tectonics can be divided into three belts eastward, including uplift area, frontal fault and fold belt, and frontal sag belt, in which the uplift area can be subdivided into two units of both basal uplift belt and uplift marginal deformation belt. Moreover, a conclusion that Micang area has experienced six evolution stages since Indosinian is obtained from some analysis on unconformity and low temperature chronology. Finally,integrating with regional tectonic setting, that there are two tectonic forming mechanisms in Micangshan area is discussed, i.e., one EW- striking tectonic was caused by interaction of two structural wedges formed from northern marginal of the Upper Yangtze Plate occurring a compaction southward, and another N-E-striking slipfault tectonic generated from a combined compaction by both Longmenshan and Dabashan mountains.
出处
《天然气技术与经济》
2016年第2期22-25,33,共5页
Natural Gas Technology and Economy
基金
中国石化股份公司科技开发部项目《四川盆地及周缘上组合天然气富集规律与增储领域》(P11082)部分研究成果
关键词
米仓山隆起
构造特征
构造演化
构造成因
Micangshan uplift
tectonic characteristics
tectonic evolution
tectonic origin
