High PT Sound Velocities of Amphiboles: Implications for LowVelocity Anomalies in Metasomatized Upper Mantle Academic Article uri icon


  • AbstractMetasomatized mantle xenoliths containing hydrous minerals, such as amphiboles, serpentine, and phlogopite, likely represent the potential mineralogical compositions of the metasomatized upper mantle, where low seismic velocities are commonly observed. This study presents the first experimentally determined singlecrystal elasticity model of an Fefree near Ca, Mgendmember amphibole tremolite at high pressure and/or temperature conditions (maximum pressure 7.3(1) GPa, maximum temperature 700K) using Brillouin spectroscopy. We found that sound velocities of amphiboles strongly depend on the Fe content. We then calculated the sound velocities of 441 hydrousmineralbearing mantle xenoliths collected around the globe, and quantitatively evaluated the roles that amphiboles, phlogopite and serpentine played in producing the low velocity anomalies in the metasomatized upper mantle.

published proceedings

  • Geophysical Research Letters

author list (cited authors)

  • Zhou, W., Hao, M., Zhang, D., Dera, P., Charin, S., & Zhang, J. S.

citation count

  • 0

complete list of authors

  • Zhou, Wen‐Yi||Hao, Ming||Zhang, Dongzhou||Dera, Przemyslaw||Charin, Soisiri||Zhang, Jin S

publication date

  • March 2024