Abstract
A magnetotelluric study was carried out in the Xuefeng mountain uplift belt and its western margins. A detailed investigation was made of the resistivity of the formations, and reliable data were obtained. The sedimentary cover and basement structure of the Xuefeng mountain area and the deep geological structure were analyzed in detail using magnetotelluric data from the two-dimensional inversion of the resistivity profile data in combination with regional gravity and magnetic data. It was concluded that the tectonic movements were characterized by basement detachment, and north-south ramp. The study area can be divided into a southern uplift zone, a southern thrust-faulted zone, a central uplift zone, and a northern depression zone. This work has provided geophysical evidence that can be used in future studies of the tectonics and petroleum geology of this region.
Highlights
The Xuefeng mountain uplift belt is located in the west of Hu’nan Province, China
The Neoproterozoic Banxi Group is exposed over a large area at the base of the structural belt and the reason for the exposure of these basement rocks is one of
It has previously been suggested that the Precambrian metamorphic rocks outcropping in south China are an in situ series representing the long-term tectonic uplift of part of the so-called Jiangnan Ancient Land (Huang et al 1977)
Summary
The Xuefeng mountain uplift belt is located in the west of Hu’nan Province, China. The mountains are NE-trending and are nearly 100 km wide, stretching for hundreds of kilometers. An alternative view is that the Proterozoic Banxi Group exposed in this area is a nappe formed by large-scale overthrusting as a result of plate collision (Xu 1980, 1987; Xu et al 1987). Qiu et al (1999) suggested that the exposed Proterozoic Banxi Group is the result of this thrust nappe tectonic setting and not an Appalachian-style remote long-distance nappe. A lack of deep geophysical data and understanding of the styles of tectonic deformation in this area have resulted in these widely diverging views of the geological history. Earthq Sci (2016) 29(2):127137 through the Xuefeng mountain uplift belt and its western margin (Fig. 1) By combining these data with related geological and geophysical information, the development and location of the thrust nappe belt and its deep tectonic characteristics can be explained. This study provided geophysical evidence that could be used in further studies of the tectonics and petroleum geology of the region
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