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上地幔过渡带的结构形态对于研究上覆岩石圈的构造环境有十分重要的意义。本文通过对横跨华北克拉通中东部的一条北西向的测线L上分布的35个宽频带台站记录的远震数据进行接收函数的计算和共转换点叠加成像,得到了测线下方上地幔过渡带的结构。成像结果表明:华北克拉通的三个陆块处于不同的构造环境,西部陆块较为稳定,中部造山带位于地幔对流较强的构造环境内,而东部陆块由于受到太平洋俯冲板块的影响,所处环境温度较低,说明中部造山带内的裂陷盆地在形成过程中,受到地幔对流作用的影响较大,而东部陆块内的新生代裂陷盆地在形成过程中,可能主要是受到右旋拉张力的作用,两者的形成主要动力或有不同。
The structural form of the upper mantle transition zone is of great significance for the study of the tectonic setting of overlying lithosphere. In this paper, the receiver function and the co-conversion point superimposed imaging are recorded for the teleseismic data recorded by 35 broadband stations distributed over a northwesterly line L in the central and eastern part of North China Craton. Mantle transition zone structure. The results show that the three continental blocks in North China Craton are in different tectonic setting, the western block is relatively stable, the central orogenic belt is located in a strong mantle convection tectonic setting, and the east block is affected by Pacific subduction plate The lower ambient temperature indicates that the rifted basins in the central orogenic belt are greatly affected by the convection of the mantle in the process of their formation. The Cenozoic rift basins in the eastern block may be mainly influenced by the right Tension pull the role of the formation of the two main driving force or different.