Elastic wave velocity in rocks from Dabieshan and its constraints for lithospheric composition and crust-mantle recycling

摘要

P-and S-wave velocities in eclogites and granulites from the Dabie ultrahigh pressure (UHP) meta- morphic belt, China, were measured at room temperature under the hydrostatic pressures up to 1.0 Gpa. The ultrahigh pressure eclogites had the highest densities (3.3～3.6 g.cm~-3), high velocities and the lowest anisotropy (1.4～ 2.6/100). The lowest densities (2.8～3.1 g.cm~-3), and the highest Poisson's ratios (0.28-0.29) were found in gran- ulites, whereas the strongest anisotropies (6.0～8.4/100) were found in the high-pressure (HP) eclogites.