滇中及邻区大地构造演化─运动特征  

THE TECTONIC EVOLUTION MOVEMENT CHARACTERISTICS OF CENTRAL YUNNAN AND ITS ADJACENT DISTRICT

作　　者：彭省临[1] 陈国达[1] 赖健清[1] 

机构地区：[1]中南工业大学地洼学说成矿学研究所

出　　处：《中南工业大学学报》1999年第4期336-341,共6页Journal of Central South University of Technology(Natural Science)

基　　金：国家自然科学基金;国家教育部博士点基金

摘　　要：滇中及其邻区的大地构造演化运动经历了原陆壳活动阶段、原陆壳“稳定”阶段、地槽、地台和地洼５个阶段，留下了相应的构造层．前地槽构造层包括活动和稳定２种类型，具有面状分布的特征，代表陆壳演化初期刚性较低的地壳特点．地槽构造层以大红山群、昆阳群和澄江组为代表，但邻区出现分异现象．地台构造层的特征表明最迟在寒武纪，本区壳体接合成为一个稳定的整体，但从奥陶纪开始古地台边缘出现陆缘扩张现象，形成局部扩张槽．地洼阶段具有中亚壳体和东亚壳体过渡性特点，地洼阶段开始的时间与东亚壳体的相同，而激烈期时间与中亚壳体的相同．通过构造层特征的分析，认为滇中及其邻区壳体成长经历了接合、同化、分异、同化的过程．The tectonic evolution movement history of Central Yunnan and its adjacent district has gone through five stages, that is, protocontinental crust mobile stage, protocontinental crust “stable” stage, geosynclinal stage, platform stage, and geodepression (diwa) stage, which all have left corresponding structural layers. The pregeosynclinal structural layer consists of two types of mobile and stable one, which are dispersed planarly and take the features of weak primary crust. The geosynclinal structural layer is represented by Dahongshan Group, Kunyang Group, and Chengjiang Formation in Central Yunnan except in adjacent district. The features of the platform structural layer indicate that a stable block formed at the latest in Cambrian Period, but the continental margin of the paleoplatform began to spread after Ordovician Period became local spread troughs. The geodepression (diwa) stage had the transitional features of Central Asia type crustobodies and Eastern Asia type crustobodies. Its starting time is the same as that of East Asia type crustobodies, but intense period the same as that of Central Asia type crustobody. Analysis on the features of the structural layers makes it clear that the crustobody of Central Yunnan and its adjacent district grew with the processes of joint, assimilation, differentiation, and assimilation again.

关 键 词：大地构造 地洼 壳体 陆缘扩张 云南 构造运动 

分 类 号：P541[天文地球—构造地质学] P547[天文地球—地质学]