五台山—恒山地区变质岩系构造相相变成因分析  

Cause Analysis on the Phase Transition of the Tectonic Facies of the Metamorphic Rock Series in the Wutai Mountain-Heng Mountain Areas

作　　者：郭景林[1] 米广尧[2] 范林森[1] 

机构地区：[1]山西省煤炭工业厅资源地质局,太原030045 [2]山西省地质调查院,山西榆次030600

出　　处：《太原理工大学学报》2011年第4期396-402,共7页Journal of Taiyuan University of Technology

基　　金：中国地质调查局区域地质调查基金资助项目(0100114103)

摘　　要：五台山—恒山地区出露有不同层次的地壳,是研究构造相最理想的地区之一。作者对该区早前寒武纪构造特征进行了分析。根据不同层次的褶皱、断裂、布丁化岩石及同构造分泌结晶脉的宏观地质特征和与其相关的微组构特征,结合当前实验研究成果,提出了变质岩构造相新的划分方案,并对该区进行了构造相的划分;综合地质单元的地质特征、岩石学、变形变质特征和同位素年代学资料,对区内早前寒武纪的构造环境进行了初步研究;并在此基础上对该区的地壳演化和构造相相变成因进行了探讨。合理地解释了变质岩区普遍发生的所谓"同岩异化"和"异岩趋同",或"同物异相"和"同相异样"现象,为变质岩区提供了一种新的研究思路和工作方法。恒山角闪麻粒岩相高级区代表中-下地壳的过渡带、拆离带,其典型的构造样式、物质组成、变质作用及深融作用对于研究中下地壳的流变习性、地壳分异作用、早期大陆裂解事件具有十分重要的意义。Areas in the Wutai mountain-Heng mountain are considered to be one of the most popular places for the tectonic facies researches owing to the various structural characters at different crust levels. In the present study, the structural characteristics of the Early Precambrian were analyzed. On the basis of the different geological characters of fold, fracture, pudding of the rock and syntectonic crystallization, some references were provided for analyzing the tectonic facies and the structural phase transition in the areas. Combined with the information of the geological characteristics, petrology, deformation, and metamorphic characteristics, and isotope chronology of the geological unit, the preliminary studies were conducted on the tectonic environment of the the Early Precambrian in the areas, and discussions were made on the crustal evolution and the cause of the tectonic facies phase transition. The phenomena occurring commonly in the Meta-morphic rock areas was explained reasonably,that is, the alienation between the same rocks and the convergence between the different rocks, or the same thing with different phases and the same phase with different faces. All of these provided the new research thinking and the working meth- ods for the metamorphic rock areas. The high-grade regions of the Hornblende granulite phase in the Heng mountain areas represent the mid-lower crust＇s transitional zone and detachment zone. Their and it＇s typical structural styles, material composition, metamorphism and the effects of the deep melting have important significance on the researches of the mid-lower crust＇s rheological behavior, crustal differentiation and the cracking events for early continent.

关 键 词：构造相 构造相相变 成因分析 前寒武纪变质岩 五台山-恒山地区 

分 类 号：P548[天文地球—构造地质学] P588.3[天文地球—地质学]