内蒙古哈达门沟地区黑云母击象及其构造意义  

Biotite percussion figures of metamorphic rocks of ural mountain group in Hadamengou area and its tectonic significance

作　　者：陈代鑫[1] 王根厚[1] 刘得文[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083

出　　处：《地质找矿论丛》2015年第2期280-285,共6页Contributions to Geology and Mineral Resources Research

基　　金：西部重点地区地质矿产调查评价项目之"内蒙古哈达门沟金矿田深部矿产远景调查"(编号:12120113072200)资助

摘　　要：黑云母击象构造是一种快速受力、脆性变形的产物。文章阐述了内蒙古哈达门沟地区新太古界乌拉山群变质岩中的黑云母发育的击象构造特征,认为黑云母击象明显受到退变质作用和混合岩化作用及韧性剪切作用,很可能是形成于新太古代末—古元古代初呼和浩特—包头断裂和临河—集宁断裂产生的地震作用中;新太古代岩石中黑云母击象的存在也证明了华北地块在新太古代末—古元古代初已经具备了较强的刚度,板块构造理论适用范围的最早时限很可能向前推移到新太古代。The biotite percussion figures are the products of rapid stress and brittle deformation. Study on biotite percussion figures in Neo-archean metamorphic rocks of Ural mountain group shows that they are possibly formed in the initial earthquake caused by the Late Neoarchean to Early Proterozoie Hohhot- Baotou fault and Kanawha -Jining fault and are obviously transformed by retrometamorphism in the area. The existence of biotite percussion figures also shows that in the late Neoarchean to early Proterozoic peri- od the North China block already had sufficient rigidity and since then the movement of the earth＇s crust can be explained with the theory of plate tectonics.

关 键 词：哈达门沟地区 黑云母击象构造 呼和浩特-包头断裂 板块构造 内蒙古 

分 类 号：P573[天文地球—矿物学] P578.94[天文地球—地质学]