桐柏-大别碰撞造山带的基本组成与结构  

MAJOR CONSTITUENTS AND TEXTURE OF THE TONGBAI-DABIE COLLISIONAL OROGENIC BELT

作　　者：钟增球[1] 索书田[1] 张宏飞[1] 周汉文[1] 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074

出　　处：《地球科学（中国地质大学学报）》2001年第6期560-567,共8页Earth Science-Journal of China University of Geosciences

基　　金：国家重点基础研究发展规划项目 (G19990 75 5 0 6) ;国家自然科学基金项目 (No .497940 41;40 0 730 0 5 )

摘　　要：桐柏 -大别碰撞造山带的组成与结构 ,主要是印支期碰撞及高压、超高压变质期后伸展构造和中新生代热 -构造演化的结果 .在组成上 ,除了燕山期及其后的岩浆活动和盆地堆积产物以外 ,主要包括核部杂岩单元、超高压单元、高压单元、绿帘 -蓝片岩单元和沉积盖层单元等 ,此外还有一些镁铁质和超镁铁质岩体残留或侵入其中 .桐柏 -大别碰撞造山带的整体结构样式类似于北美西部的变质核杂岩带 ,即以总体具穹隆形态及多层拆离滑脱带的发育为特征 ,构成了以罗田和桐柏山为核部的两个穹隆 .超高压单元、高压单元和绿帘蓝片岩单元作为不同的岩片夹持于核部杂岩和沉积盖层之间 ,其分布格局受碰撞期后伸展构造格架所制约 .The present constitution and architecture of the Tongbai-Dabie orogenic belt is the combined result of the Triassic subduction collision, the extension tectonics postdating the HP-and UHP metamorphism, and thermo-tectonic evolutions in the Mesozoic-Cenozoic time. In addition to Yanshanian and post-Yanshanian magmatic intrusions, volcanics, and basin deposits, the lithotectonic constituents of the Dabie orogenic belt mainly consist of a core complex (CC) unit, a UHP unit, a HP unit, an epidote blueschist (EBS) unit and a sedimentary cover (SC) unit. Minor mafic-ultramafic plutons or massifs were intruded into or preserved within them. The rock slices of UHP, HP, and EBS units are progressively sandwiched between the underlying core complex and the overlying sedimentary cover. The distribution of lithotectonic units is controlled by an extensional tectonic framework postdated the collisional event. The tectonic pattern of the Tongbai-Dabie orogenic belt as a whole is similar to that of the metamorphic core complex described from the western North America, which is characterized by a general doming morphology with the development of multi-layered detachment zones.

关 键 词：碰撞造山带 组成 结构 印支期 岩浆活动 沉积盖层 热-构造事件 

分 类 号：P542.2[天文地球—构造地质学]