勒巴泉—公婆泉陆缘弧主要特征及动力学背景  

THE MAIN CHARACTERISTICS OF LEBAQUAN-GONGPOQUAN EPICONTINENTAL ARC AND THE DYNAMIC BACKGROUND FOR ITS FORMING IN THE CONTIGUOUS AREA ACROSS GANSU, XINJIANG AND INNER MONGOLIA

作　　者：杜刚[1] 李卫红[2] 杨文彬 王伟[2] 白云来[1] 

机构地区：[1]中国地质大学,北京100083 [2]甘肃省地质调查院,甘肃兰州730000 [3]内蒙古自治区煤田地质局,内蒙古呼和浩特010051

出　　处：《甘肃地质学报》2003年第1期16-20,共5页Acta Geologica Gansu

基　　金：中国地质调查局大调查项目 (k4 334)资助

摘　　要：文中着重讨论了勒巴泉—公婆泉陆缘弧的基本特征及形成的动力学背景。认为 ,加里东晚期弧后扩张、俯冲形成勒巴泉—公婆泉陆缘弧 ,红柳河弧后盆地的扩张与俯冲是形成勒巴泉—公婆泉陆缘弧的关键 ;陆缘弧区地层主要由公婆泉群 (SG)组成 ,由一系列链状火山岛屿和其间的火山洼地构成 ,属海潮间—潮下高能地带 ,生物发育 ,火山活动异常强烈时期形成窑洞努如和公婆泉两个火山穹隆构造 ;主要岩石类型为爆发相、钙碱性系列的中酸性火山岩。该陆缘弧不仅发育火山作用 。This paper focus on the basic characteristics of Lebaquan-Gongpoquan epicontinental arc and the dynamic background for its formation in the contiguous area across Gansu, Xinjiang and Inner Mongolia. The late Caledonian back-arc spread and thrust led to the formation of Lebaquan-Gongpoquan epicontinental arc. The spread and thrust of Hongliuhe back-arc is the key step forming formation of Lebaquan-Gongpoquan epicontinental arc. The epicontinental arc consists of a series of chained volcanic islands and depressions.The dominant strata in the epicontinental arc area are mainly Gongpoquan Group (S G ) which formed in intertidal-lower tidal environment with abundant organisms. Both Yaodongluru and Gongpoquan volcanic domes were formed by extremely strong volcanic activity. Dominant rock type is volcanic eruption facis and calc-alkaline medium-acid volcanic rocks. Disseminated sulfide copper metallogenic system exists in the arc.

关 键 词：甘、蒙、新结合部 勒巴泉一公婆泉陆缘弧 动力学背景 

分 类 号：P54[天文地球—构造地质学]