天水地区花岗岩类及其构造演化
The Granitoid and Its Tectonic Evolution in Tianshui Area
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摘要: 通过对地处祁连造山带与秦岭造山带结合部位的天水地区花岗岩类的岩石学、岩石化学、地球化学等资料的分析研究,区内花岗岩类可划分为3个构造岩浆带。对大量的花岗岩类构造环境信息综合分析表明,祁连造山带和秦岭造山带在晚古生代之前,二者分属两大造山带,具有皆然不同的岩浆事件和大地构造背景及其演化模式。直到晚古生代之后,祁连造山带才与秦岭造山带一道共同进入陆内演化阶段。花岗岩类为探索本区构造演化特征提供了佐证,具有重要研究意义。Abstract: The granitoids can be devided in to three tectonics magma belts according to the petrochemistry and geochemistry study of Tianshui area located in the junction region between the Qinling orogenic belt and Qilian orogenic belt.The two belts are subordinate to two orogenic belt before Neopaleozo ic.According to the research results of the tectonic environment,they are evidently different with regard to magma events,tectonic background and evolvement pattern.But in Neopaleozoic,Qinling orogenic belt and Qilian orogenic belt united and began continent evolvement together.The study of granitoids in this area provided evidence of its tectonic evolvement.
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