High-resolution 3-D lithospheric structure beneath the Qinling-Dabie orogenic belt from joint inversion of receiver functions and ambient noise

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Tectonophysics Pub Date : 2024-09-02 DOI:10.1016/j.tecto.2024.230494
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Abstract

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.

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接收器函数和环境噪声联合反演得出的秦岭-大别造山带下的高分辨率三维岩石圈结构
秦岭-大别造山带(Qinling-Dabie orogenic zone,QD)由长江和华北两大环形山汇聚而成,是华中造山系统的重要组成部分。要全面理解青藏高原的克拉通演化和下地壳流动,就必须了解秦岭-大别造山带的地壳和地幔结构。我们利用接收函数和环境噪声的联合反演,高分辨率地重建了青藏高原下的三维岩石圈结构。观测结果表明,秦岭西部造山带下地壳中下部的高速异常阻碍了源于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,证明西秦岭造山带没有来自青藏高原的下地壳东流穿过。渭河断裂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向星体流对这些地区下的最上层地幔造成了巨大的热化学侵蚀。研究结果还表明,大别造山带下的最上层地幔高速异常局限在有限的区域内,深度仅为70千米。我们提出,在三叠纪期间,深俯冲的大陆岩石圈返回到最上层地幔,形成了大别造山带下的高速异常。
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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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