Crustal structure of the southeastern margin of the Ordos Block

我们由 teleseismic 接收装置功能组成使用侧面学习厄多斯·布洛克的东南的边缘的外壳的厚度和结构。Mohorovii 断绝(莫霍) 在所有车站下面被识别了。它的深度逐渐地向东南减少，从在到 Qinling Orogen 的北边缘附近的 30 km 的厄多斯·布洛克的大约 43 km。我们的结果在外壳的结构和莫霍的特征显示出清楚的侧面的变化。因此，学习区域能被划分成四部分：(1 ) 在厄多斯·布洛克，下面，莫霍在 40 km 的深度可见、扁平。外壳的结构被稳定的 cratonic 外壳最好描绘。(2 ) 在 Weihe 山西 Graben，莫霍被大约 3 km 高举，它可以是上面的披风材料的 upwelling 的结果。(3 ) 在 Xionger-Funiu 山下面，莫霍在在 36 和 33 km 之间的深度是扁平的，但是向东南变得更浅。(4 ) 在 Hehuai 盆，邻近 Qinling Orogen 的北边缘，莫霍与 31 km 的吝啬的深度显示出强壮的侧面的变化。这里的外壳的结构是复杂的，它可以显示复杂构造环境。另外，莫霍清楚地在二个地点被打断(在车站 st11 和 st18 下面) 近主要的构造边界。这些结果建议沿着厄多斯·布洛克的东南的边缘的深外壳的结构有大侧面的可变性，它强烈在表面上影响复杂地质的特征。而且，这些结果能帮助我们理解厄多斯·布洛克的东南的边缘的不同部分的相互关系。

We use a profile made up of teleseismic receiver functions to study the crustal thickness and structure of the southeastern margin of the Ordos Block. The Mohorovicic discontinuity（Moho） has been identified beneath all stations. Its depth gradually decreases towards the southeast, from about 43 km in the Ordos Block to -30 km near the northern margin of the Qinling Orogen. Our results show clear lateral variations in the structure of the crust and the features of the Moho. Accordingly, the study region can be divided into four parts： （1） Beneath the Ordos Block, the Moho is visible and fiat at a depth of -40 km. The crustal structure is best characterized by stable cratonic crust. （2） In the Weihe-Shanxi Graben, the Moho is uplifted by about 3 km, which may be the result of upwelling of upper mantle materials. （3） Under the Xionger-Funiu Mountains, the Moho is flat at a depth between 36 and 33 km, but becomes shallower towards the southeast. （4） In the Hehuai Basin, adjacent to the northern margin of the Qinling Orogen, the Moho shows strong lateral variations with a mean depth of-31 km. The crustal structure here is complex, which may indicate a complicated tectonic environment. Additionally, the Moho is clearly interrupted at two locations （beneath stations stl 1 and st18） near major tectonic boundaries. These results suggest that the structure of the deep crust along the southeastern margin of the Ordos Block has great lateral variability, which strongly affects the complex geological features on the surface. Furthermore, these results can help us understand the interrelationships of different parts of the southeastern margin of the Ordos Block.