陕南镇巴地区大巴山与米仓山构造交接关系  

Tectonic intersection relationship between Dabashan and Micangshan in Zhenba area,southern Shaanxi Province

作　　者：裴先治[1,2] 李瑞保[2] 丁仨平 刘战庆[2] 李佐臣[2] 冯建赟[2] 孙雨[2] 张亚峰[2] 

机构地区：[1]长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054 [2]长安大学地球科学与资源学院,陕西西安710054

出　　处：《石油与天然气地质》2009年第5期576-583,共8页Oil & Gas Geology

基　　金：中国石油化工股份有限公司海相前瞻性研究项目;国家自然科学基金项目(40572121)

摘　　要：米仓山与大巴山构造交接的陕南镇巴地区具有典型的叠加褶皱构造。米仓山地区近东西-北东东向褶皱构造与大巴山近南北-北北东向紧闭褶皱构造呈横跨叠加构造样式。司上地区发育的叠加褶皱表明,近南北向褶皱叠加改造早期近东西向褶皱,致使区域地层呈近南北向产出;两期褶皱发育的时代应为J3—K1,米仓山褶皱变形的时间要略早于南大巴山西段镇巴地区变形时间,分别为晚侏罗世(J3)和晚侏罗世—早白垩世之间(J3/K1)。大巴山与米仓山构造交接变形是在印支期碰撞造山作用基础上,燕山期陆内造山作用期间不同体系构造复合叠加的产物。Typical superimposed fold structure occurs in the Zhengba region,southern Shaanxi Province,where the Micangshan and Dabashan structures intersect with each other.The nearly EW-NEE trending fold structures in Micangshan area and the nearly SN-NNE trending closed fold structures in Dabashan area are in traverse superimposition.The superimposed folds developed in the Sishang area show that the early E-W trending folds were superimposed and deformed by the late S-N trending folds,resulting in the nearly S-N occurrence of the regional strata.These folds were developed during J3-K1.However,the folding and deformation of the Micangshan area happened in the Late Jurassic（J3）,a little earlier than that of the Zhenba area（the west segment of the sou-thern Dabashan Mountain）,which happened during the Late Jurassic and Early Cretaceous（J3/K1）.The intersection and deformation of Dabashan and Micangshan were resulted from superimposition of different tectonic systems during the Yanshanian intracontinental orogeny on the basis of the Indosinian collision orogeny.

关 键 词：构造交接关系 叠加褶皱 陆内造山作用 米仓山 大巴山 陕南镇巴地区 

分 类 号：TE122.3[石油与天然气工程—油气勘探]