中国西北大陆岩石圈类型、岩石学结构及其意义
Lithospheric Types, Petrological Structures and Their Implications in Northwestern China Continent
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摘要: 根据西北地区的地质和地球物理特征,区分出中国西北大陆以准噶尔和塔里木为代表的克拉通型岩石圈和造山带型岩石圈,而造山带型岩石圈又可以区分为以额济纳旗为代表的古生代造山带型岩石圈(老物质新结构)和包括天山、阿尔泰山、昆仑山在内的新生代造山型岩石圈(老物质新结构);依据岩石学方法、壳幔演化模型和造山带形成过程以及地震波速与岩石化学成分之间的关系,建立相应类型岩石圈的壳幔岩石学结构,讨论了不同岩石圈类型的壳幔物质结构、地壳和岩石圈地幔厚度的地质含义及其找矿意义.Abstract: On the basis of the geological and geophysical characteristics of northw estern China continent, cratonic type and orogenic-type lithosphere represented by Junggar Basin and Tarim in northw estern China continent are distinguished. And orogenic-type lithosphere can be subdivided in to Paleozoic orogenic-type lithosphere represented by Ejinaqi (old material and new structure) and Cenozoic orogenic-type lithosphere including Tianshan Mountain, Altai and Kunlun (old material and new structure). In light of the petrologica. method, model of crust-mantle evolution, orogenic forming process, relationships between the seismic velocity and pet rochemistry composition, petrological structu reprisms corresponding with different lithospheric types have been set up, crust-mantle material structure in differen tlithospheric types, geologic meaning of crust and Mantle's thickness and its significance for prospecting have been discussed.
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