Magnetotelluric data along a profile in the East Dabie Mountains was collected, which is across the ultra‐high pressure metamorphic belt, in NNE direction. By data‐analysis and interpretation, the two‐dimensional electrical structure of crust‐upper mantle of Dabie orogen is obtained, indicating that the North Huaiyang Tectonic Belt and Dabie Block are different tectonic units. They are separated by the Xiaotian‐Mozitan fault, which is dipping north and probably decoupled in the mid‐lower crust. Four electrical layers can be identified from surface to depth, which are the surficial weathering layer, the high resistivity layer in mid‐upper crust, the relatively high conductive layer in the crust and the mantle layer. In the Dabie Block, the mid‐upper crust is mainly of high resistivity, and corresponding with the distribution area of ultra‐high pressure metamorphic rock, of which the thickest portion is below Yuexi‐Yingshan. In the Dabie Block, there maybe exist channels of granitic magma activity of the Yanshan Period (205~66Ma), which make further uplift of the ultra‐high pressure metamorphic rocks and affect the distribution of inner‐crust high conductive layers and cause great difference in depth of the high conductive layer.
Magnetotelluric (MT) measurement has been carried out at 7 sites along a profile in NNW direction in Arxan active volcanic area. The data were processed and analyzed by using a two‐dimensional (2‐D) inversion. The obtained 2‐D result shows that two volcanic zones, an older and a younger volcanic zone with their magma conduits down to depth, exist in the study area. The newly found younger active volcanic zone still maintains its higher temperature state at depth of 10~12km, where there may exist abundant fluid, and a conduit for supplying heat from the mantle to the crust exists at depth of 30~50km. But a magma conduit being in cooling may exist down to depth of 30km beneath the older volcanic zone. The two volcanic zones may have the same resource at depth.
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