Mantle transition zone thickness anomaly at middle Southern China by receiver function: evidence for Hainan Plume

We have presented the 410 km and 660 km mantle discontinuity structure and mantle transition zone (MTZ) thickness beneath the middle Southern China Block using seismic data recorded by 84 portable seismic stations in the region by receiver function method. We found that transition zone thickness beneath Cathaysia Block is thinned 10 similar to 25 km obviously, the MTZ thinned anomalously within an area approximately 200 km in diameter centered (23. 7 degrees N, 114. 5 degrees E), where the Hainan mantle plume may upwell into upper mantle, the continuous upwelling of hot mantle materials resulted in a wide range of low velocity anomalies in the upper mantle beneath the Cathaysia Block (above 410 km), also a large range of Cenozoic basalts in Leizhou Peninsula and coastal areas.