Affiliation:
1. Department of Earth and Space Sciences Southern University of Science and Technology Shenzhen China
2. Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology Southern University of Science and Technology Shenzhen China
3. Guangdong Provincial Key Laboratory of Geophysical High‐resolution Imaging Technology Southern University of Science and Technology Shenzhen China
Abstract
AbstractWe investigated the crustal radial anisotropy in the eastern South China Block (ESCB) with the F‐J multimodal ambient noise tomography. Well corresponding to widespread mid‐crustal low‐velocity zones in the model, a pronounced mid‐crustal channel of positive radial anisotropy is revealed. In the Cathaysia Block, it may origin from sub‐horizontally aligned quartz induced by extension and correspond to the phase transition of to quartz. In other areas, while, it may be relevant to other well‐aligned minerals. This positive mid‐crustal radial anisotropy channel not only provides the solid evidence for dominative extensional deformation since late Mesozoic, but also may indicate an important detachment surface, contributing much to the early Mesozoic magmatism in the ESCB.
Funder
National Natural Science Foundation of China
Publisher
American Geophysical Union (AGU)