Resulting from the convergence of the Yangtze and North China Cratons, the Qinling-Dabie orogenic zone (QD) represents an important element in the central China orogenic system. To fully comprehend the craton evolution and lower crustal flow from the Tibetan Plateau, it is important to understand the crust and mantle structure of the QD. We reconstructed the three-dimensional lithospheric structure beneath the QD with high resolution using the joint inversion of receiver functions and ambient noise. Observations reveal that a high-velocity anomaly in the middle to lower crust beneath the western Qinling (WQL) orogen obstructs the eastward extension of a crustal low-velocity anomaly originating from the Tibetan Plateau. This finding provides unambiguous evidence that the WQL orogen is not crossed by eastward lower crustal flow from the Tibetan Plateau. The lithospheric mantle beneath the Weihe Rift and East Qinling orogen exhibits low-velocity characteristics, indicating that eastward asthenospheric flow from the Tibetan Plateau has caused substantial thermal-chemical erosion in the uppermost mantle beneath these regions. The results additionally indicate that the uppermost mantle high-velocity anomalies beneath the Dabie orogen is confined in a limited area and extends only to a depth of 70 km. We propose that during the Triassic, deeply subducted continental lithosphere returned into the uppermost mantle, forming the high-velocity anomalies beneath the Dabie orogen.

中文翻译：

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秦岭-大别造山带下由接收器功能与环境噪声联合反演得到的高分辨率三维岩石圈结构


由长江克拉通和华北克拉通交汇而成的秦岭-大别造山带 （QD） 是华中造山系统中的重要元素。为了充分理解青藏高原的克拉通演化和下地壳流，了解 QD 的地壳和地幔结构非常重要。我们利用接收器函数和环境噪声的联合反演，以高分辨率重建了 QD 下方的三维岩石圈结构。观测显示，西秦岭 （WQL） 造山带下方中下地壳的高速异常阻碍了源自青藏高原的地壳低速异常向东延伸。这一发现提供了明确的证据，表明 WQL 造山带没有被来自青藏高原的东向下地壳流穿过。渭河裂谷和东秦岭造山带下的岩石圈地幔表现出低速特征，表明来自青藏高原的东流对这些区域下方最上层地幔造成了实质性的热化学侵蚀。结果还表明，Dabie 造山带下方最上层的地幔高速异常局限在有限的区域内，仅延伸到 70 km 的深度。我们提出，在三叠纪，深俯冲的大陆岩石圈回到最上层的地幔中，形成了 Dabie 造山带下方的高速异常。