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<p>To explore the high heat flow anomalies from the Dabie orogenic belt, We have set up 15 Magnetotelluric(MT) stations. The stations have an average spacing of ∼2 km. Firstly, the phase tensor method is used to analyze MT data to estimate the dimensional characteristics of the underground resistivity structure. Then, based on the results of dimensional characteristics analysis, three-dimensional (3D) inversion was performed using ModEM, and a 3D resistivity structure from the surface to a depth of 30 km was obtained. It shows: that there are extensive low resistivity anomalies in the lower crust of the northern margin of the Dabie orogenic belt, which may be partial melting or water-bearing fluid. The high heat flow anomaly in the northern margin of the Dabie orogenic belt may be due to the increase of the background heat flow value caused by the orogenic belt delamination during post-collision, the thinning of the lithosphere and the upwelling of the asthenosphere.</p>

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Magnetotelluric imaging of the northern margin of the Dabie orogenic belt: implications for thermal structure

  • 期刊论文

  • 发表日期：

    2025年4月11日

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  • Wangqi Ren,
  • Guoqiang Xue,
  • Weiying Chen,
  • Tao Chen

摘要

To explore the high heat flow anomalies from the Dabie orogenic belt, We have set up 15 Magnetotelluric(MT) stations. The stations have an average spacing of ∼2 km. Firstly, the phase tensor method is used to analyze MT data to estimate the dimensional characteristics of the underground resistivity structure. Then, based on the results of dimensional characteristics analysis, three-dimensional (3D) inversion was performed using ModEM, and a 3D resistivity structure from the surface to a depth of 30 km was obtained. It shows: that there are extensive low resistivity anomalies in the lower crust of the northern margin of the Dabie orogenic belt, which may be partial melting or water-bearing fluid. The high heat flow anomaly in the northern margin of the Dabie orogenic belt may be due to the increase of the background heat flow value caused by the orogenic belt delamination during post-collision, the thinning of the lithosphere and the upwelling of the asthenosphere.