The relationship between the crust and upper mantle velocity variations beneath the mid-lower Yangtze River region and the Yangtze metallogenic belt

The mid-lower Yangtze river region includes four main tectonic units: Dabie-Sulu orogenic belt, the North China Craton, the Tanlu strike-slip fault and the Yangtze Craton. The arc-like metallogenic belt located in the mid-lower Yangtze river region is an important polymetallic metallogenic belt and mineral resource base in eastern China, and its deep geodynamic process has been the focus of debate for deposit scientists for a long time. By collecting earthquake and ambient noise data recorded by the temporary array and regional network operated by China Earthquake Administration, in this study we plan to apply two-plane waves method, ambient noise tomography and receiver function common conversion point stacking technique to obtain a high-resolution deep crustal-mantle velocity structure of the Yangtze metallogenic belt. Our preliminary results show that the crustal structure and the Moho depth beneath the Yangtze metallogenic belt are different from those of its surrounding region. We also note that the region featured with a low-velocity zone in the upper mantle at depth of about 150 km in the Yangtze metallogenic belt from previous P-wave studies also is also delineated with an uplifted Moho in our study. More detailed and accurate results are expected in the subsequent data processing and analysis.