秦岭区前寒武纪构造格局与演化问题探讨  

On Precambrian framework and evolution of the Qinling belt.

作　　者：张国伟[1] 于在平[1] 董云鹏[1] 姚安平[1] 

机构地区：[1]西北大学地质学系,西安710069

出　　处：《岩石学报》2000年第1期11-21,共11页Acta Petrologica Sinica

基　　金：国家自然科学基金重点项目 !(编号 49732 0 80 )

摘　　要：秦岭造山带中夹持大量前寒武纪岩层、地块 ,筛除后期改造与变位 ,追踪复原 ,它们复杂而多样 ,不仅是秦岭造山带研究的基础 ,也是研究早期中国大陆壳形成演化的关键地带。现有的地质、地球化学研究 ,揭示秦岭区早前寒武纪具非统一多陆块分离拼合特征 ,晚期已成为早期华北陆块的边缘带。中新元古代相应于 Grenvillian造山事件和 Rodinia超大陆全球性构造时期 ,秦岭区从扩张裂谷系与小洋盆兼杂并存的垂向加积增生构造体制向侧向增生为主的板块构造转换过渡 ,具有深刻地幔动力学背景 ,独具特征 。The Qinling belt is one of key areas for researching on formation and evolution of early continental crust of China. A great deal of Precambrian terrians in the belt shows various characteristics and complex evolutionary history. Early stage of Precambrian is characterized by rifting apart and following integration of the late stage marginal belt of North China Block based on geological and geochemical data. Transformation from vertical accretion during Grenvillian orogeny imaged by rift system and limited ocean basins to lateral accretion of plate tectonics is important for continental dynamics with its background of mantle dynamics.

关 键 词：大陆壳 构造格局 构造演化 秦岭区 前寒武纪 

分 类 号：P547[天文地球—构造地质学] P534.1[天文地球—地质学]