Magnetotelluric Evidence for Lithospheric Alteration Beneath the Wuyi‐Yunkai Orogen: Implications for Thermal Structure of South China

Abstract

The South China Block is an important Precambrian terrane in East Asia that formed during the early Neoproterozoic when the Yangtze Craton in the NW merged with the Cathaysia Block in the SE along the Jiangnan Orogen (Chen et al., 1991;Wang et al., 2007;Zhao, 2015). The South China Block has experienced multiple episodes of tectonomagmatism, which were accompanied by strong deformation and extensive metamorphism and migmatization (Li, 2000;Wang et al., 2013). Since the early Yanshanian (∼205-135 Ma), the tectonic setting of the South China Block has involved intracontinental lithospheric extension and asthenospheric upwelling with the former resulting in the emplacement of Mesozoic (∼230-66 Ma) granites over a large area of South China (Li et al., 2014). These Mesozoic granites, especially those emplaced since the Late Mesozoic (∼66 Ma), are widely exposed at the surface along the NE-NNE -trending structural belts (Chen et al., 1991;Li, 2000).

Electrical Structure of Southwestern Longmenshan Fault Zone: Insights into Seismogenic Structure of 2013 and 2022 Lushan Earthquakes

“…In some cases, datasets are organized in profiles [41]. It has been demonstrated that three-dimensional inversion of such datasets can provide more accurate subsurface structural information compared to two-dimensional inversion [42]. The dataset used in this study is distributed along five MT profiles.…”