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Baosheng Li
Public Documents
1
Sound Velocity of Aragonite (CaCO3) at High Pressure and High Temperature and Implica...
Ying Li
and 8 more
November 07, 2021
By using the combined ultrasonic interferometry and X-ray diffraction method, the elastic wave velocities of aragonite were measured for the first time at pressure and temperature up to 5.8 GPa and 1173 K by using a hot-pressed polycrystalline specimen. Aragonite has has extremely low compressional (Vp) and shear (Vs) wave velocities and VP, low VS and high VP/VS ratio than those of the major minerals of subduction slabs. According to the average content of CO2 in the subduction zones, the velocities of carbonated-eclogite and carbonated-peridotite in both cold and hot subduction zones were modeled. It was revealed that an increase of 2.5 wt% CO2 resulted in to 2% reduction in Vp and Vs and an increase of Vp/Vs. Our results show that the velocity effect of aragonite in subduction zone can’t be ignored and shed lights on the mechanism of low velocity layers (LVL) in the subduction zones.