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鲁西隆起是华北克拉通东部重要的伸展构造,为分析鲁西隆起地区地壳结构特征,本文通过选取2010-2013年鲁西隆起及周边地区28个地震台站记录的102个远震波形(MS>6.0、震中距30°~90°),利用远震接受函数方法获得各台站下方的地壳厚度、泊松比值,结果显示:鲁西隆起地区地壳厚度值大致在29.9~36.1km之间,地壳厚度最小的区域位于北部地区,总体表现为南北向的变化特征,向南逐渐增大;相反,鲁西隆起北部地区的地壳平均泊松比值最大,向南逐渐减小.根据地壳厚度、泊松比分布特征,本文认为鲁西隆起地区的地壳结构特征是由地幔的主动上涌及对地壳的热侵蚀作用造成,这在北部地区表现最为典型.鲁西隆起伸展构造的形成是华北岩石圈减薄过程中地壳响应的结果,表明中生代华北岩石圈减薄过程存在明显的热侵蚀作用.
The Luxi Uplift is an important extensional structure in the eastern part of North China Craton. To analyze the crustal structure characteristics of the Luxi uplift region, this paper selected 102 teleseismic waveform records (MS) recorded by 28 seismic stations in the Luxi Uplift and surrounding areas during 2010-2013 > 6.0 and epicentral distance 30 ° ~ 90 °). The crustal thickness and Poisson ratio under each station were obtained by teleseismic acceptance function. The results show that the crustal thickness of Luxi uplift is about 29.9 ~ 36.1km, The area with the smallest crustal thickness is located in the northern area, showing a north-south variation characteristic, which increases gradually to the south; on the contrary, the average crustal Poisson’s ratio in the northern Luxi uplift zone is the largest and decreases to the south direction.According to the thickness of the crust, This paper considers that the crustal structure is characterized by the active upwelling of the mantle and the thermal erosion of the crust, which is the most typical in the northern region. The formation of the Luxi Uplift is formed by the North China lithosphere The results of the crustal response during the thinning process show that there is a clear thermal erosive effect on the lithospheric thinning in Mesozoic North China.