To understand the complex crustal structure beneath the central Tarim Basin, we perform joint inversions of P-wave receiver functions, ambient seismic noise Rayleigh wave dispersion, and magnetotelluric data along a nearly N-S oriented linear array. In this contribution, we present a multistep flowchart to enhance the efficiency and reliability of the joint inversion. Synthetic examples indicate that this method is effective and appropriate for realistic conditions. By using these three complementary datasets, we can construct accurate 1-D models, particularly in the presence of thick overlying low-velocity layers. We apply this approach to data recorded at 45 stations within the Tarim Basin and generate quasi-2-D images that reveal distinct lateral variations along the N-S profile. In the near-surface region, we observe that the conductive and low-velocity sedimentary layer is thinner beneath uplift units and thicker beneath structural depressions, which correlates well with surface geology and previous studies. Additionally, we interpret several major faults, concealed crustal detachment layers, and discuss the geological implications. A conspicuous feature of the integrated images is the identification of a localized and deep-rooted doming structure beneath the Bachu uplift, characterized by high-velocity and high-resistivity anomalies. This structure also exhibits elevated density, intense magnetism and the thinnest overlying sedimentary layer. Consequently, we infer that these anomalies are probably linked to a hybrid basement consisting of plume-related intrusions and mafic dyke swarms.

中文翻译：

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接收函数、环境地震噪声面波频散和大地电磁数据联合反演塔里木盆地中部地壳结构的南北向变化

为了了解塔里木盆地中部下方复杂的地壳结构，我们沿着近 NS 定向的线性阵列对 P 波接收函数、环境地震噪声瑞利波色散和大地电磁数据进行联合反演。在本文中，我们提出了一个多步骤流程图，以提高联合反演的效率和可靠性。综合实例表明该方法有效且适合实际情况。通过使用这三个互补的数据集，我们可以构建精确的一维模型，特别是在存在厚的低速覆盖层的情况下。我们将这种方法应用于塔里木盆地内 45 个站点记录的数据，并生成准二维图像，揭示沿 NS 剖面的明显横向变化。在近地表区域，我们观察到，隆起单元下方的导电低速沉积层较薄，而构造凹陷下方的导电低速沉积层较厚，这与地表地质和先前的研究密切相关。此外，我们还解释了几个主要断层、隐藏的地壳脱离层，并讨论了其地质意义。集成图像的一个显着特征是识别出巴楚隆起下方的局部深层穹顶结构，其特征是高速和高电阻率异常。该结构还表现出高密度、强磁性和最薄的上覆沉积层。因此，我们推断这些异常可能与由羽流相关侵入物和镁铁质岩脉群组成的混合基底有关。