伏牛山推覆构造特征及其动力学控制  

The Nappe Structure of the Funiu Mountains and Its Dynamics

作　　者：宋传中[1] 张国伟[2] 

机构地区：[1]合肥工业大学资源与环境科学系,230009 [2]西北大学地质系,西安710069

出　　处：《地质论评》1999年第5期492-497,共6页Geological Review

基　　金：国家自然科学基金(编号49290100)

摘　　要：伏牛山推覆构造是秦岭造山带中一条重要的构造带,特征明显,分带性清楚。锋带为前冲型或褶皱型,西段由褶皱紧密的陶湾群黑云母大理岩构成,东段为栾川群和部分三叠系,由北向南推覆在宽坪群和上白垩统之上。洛南—栾川断裂带为前锋与中带的界线。中带在栾川地区较为典型,表现为双重构造型式,伏牛山一带几乎全被根带向南掩盖。竹园沟—祖师庙断裂带为中带与根带的分界线。根带岩石形成较深,上升强烈,符合经典的推覆构造模式。伏牛山推覆构造最终形成在燕山期末—喜马拉雅期初,后展式扩展,是扬子板块向北持续俯冲挤压,华北地块向南作巨型陆内俯冲的产物,也是不同时期,相同性质构造叠加的结果。The nappe structure of the Funiu Mountains is an important structure in Qinling orogenic belt. It is formed by three structural zones. There are a lot of strong folds and reversed faults in the front zone of this nappe structure. The Luonan-Luanchuan fault is the demarcation line between the front zone and the middle zone. The middle zone consists of typical structures in the Luanchuan area, which show duplex structures. The Zhuyuangou-Zushimiao fault is the line of demarcation between the middle zone and the root zone. There are a lot of deep-seated rocks in the root zone. The nappe structure of the Funiu Mountains was formed in the late Yanshanian to the early Himalayan. It is a product of the continuous northward subduction of the Yangtze plate and the southward intracontinental subduction of the North China plate and also the result of superposition of structures of different ages and features.

关 键 词：秦岭造山带 陆内俯冲 推覆构造 动力学 双重构造 

分 类 号：P542.3[天文地球—构造地质学] P541[天文地球—地质学]