天山造山带的深部结构
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摘要
天山造山带是中亚最令人瞩目的一条由陆陆汇聚而形成的陆内造山带,从古生代以来经历了长期的构造演化,尤其是新生代以来的再次活化,导致了本医复杂的构造特征,因此在全球范围内具有独特性和活动性,是全球公认的研究大陆动力学的天然实验室.从1980年以来,针对天山及周缘的深部结构特征开展了大量的深地震探测研究工作,揭示了天山造山带的深部结构,并对造山带的缩短机制、及与两侧盆地的耦合关系等问题给出了一些解答.本文通过汇总梳理前人的深地震探测工作,探讨了天山造山带不同区段以及与两侧盆地间的深部结构,结果显示西天山造山带具有薄的岩石圈、厚地壳的特征,而东天山则与之相反,揭示了天山造山带在不同区段的隆升和动力学机制的差异.
The Tienshan is one of the most spectacular and active intracontinental mountain ranges in the world caused by the convergence of the continents.It has complex geologic and tectonic settings.Since the Paleozoic,it has undergone a long tectonic evolution,especially the reactivation in the Cenozoic.It has been taken as an object of a classical model of intracontinental orogeny to understand and explain geodynamics of the mountain building process. Since 1980s,a lot of seismic detection work has been finished around the Tienshan and adjacent regions,which revealed the deep structure,and answered some questions about the uplift mechanism and the basin- range coupling. In this paper,the authors summarize the deep seismic detection systemically.and discuss the deep structure of the Tienshan orogenic belt and adjacent basins.The result showes that the western segment of the Tienshan orogenic belt has the thinner lithosphere and thicker crust compared with the middle and eastern segment.Thismay reflect the different uplift mechanism and geodynamics.
引文
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