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中南大学学报(自然科学版)

Journal of Central South University

第30卷    第4期    总第128期    1999年8月

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文章编号:(1999)04-9-6
滇中及邻区大地构造演化─运动特征
彭省临;陈国达;赖健清

(中南工业大学地洼学说成矿学研究所,长沙,410083)

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. 

 

关键字: 大地构造;地洼;壳体;陆缘扩张;云南

THE TECTONIC EVOLUTION MOVEMENT CHARACTERISTICS OF CENTRAL YUNNAN AND ITS ADJACENT DISTRICT
Peng Shenglin Chen Guoda Lai Jianqing

Institute of Diwa Theory and Metallogeny, Central South University of Technology, Changsha, 410083, China

Abstract: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. 

 

Key words: tectonics; geodepression(Diwa); crustobody; continental margin spread; Yunnan

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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