Comment on“Origin of high-Mg adakitic magmatic enclaves from the Meichuan pluton, southern Dabie orogen (central China): Implications for delamination of the lower continental crust and melt-mantle interaction” by C. Zhang, C.Q. Ma, F. Holtz [Lithos 119 (2010) 467-484]

摘要

The North China and Yangtze blocks collided in the Triassic in central Eastern China (e.g., Li et al, 2000), forming the Dabie-Sulu orogen with an over-thickened crust similar to the one beneath the present Himalaya. Results of seismological studies indicate that the current crustal thickness of the Dabie-Sulu orogen is about 35 km (Wang et al., 2000; Sodoudi et al., 2006), indicating that a significant amount of mountain root of this orogen was removed and recycled into the convective upper mantle. The foundering mechanism of the eclogitic lower crust of the Dabie-Sulu orogen is still poorly understood. Studies on the post-collisional igneous rocks from the Dabie-Sulu orogen have provided important constraints on the timing and processes of mountain root removal as well as lithospheric thinning of central China (Wang et al, 2007; Xu et al., 2007; Huang et al., 2008; Zhang et al., 2010).