蛇紋石の非晶質化と深発地震 Amorphization of Serpentine at High Pressure and High Temperature : Implications for the Mechanism of Deep-focus Earthquakes
In situ X-ray diffraction measurements of the phase transformations in serpentine have been carried out using a multianvil high-pressure system combined with synchrotron radiation. Serpentine persisted upon compression to 28 GPa at a room temperature, while it became amorphous in a limited temperature interval of 200-400°C at pressures above 13 GPa. A rapid crystallization of high pressure phases then started at temperatures greater than about 400°C. These observations suggest that the amorphization of serpentine is an unlikely mechanism of deep-focus earthquakes associated with subduction of slabs, as the temperatures of these slabs are generally higher than those of the rapid crystallization regime.
日本結晶学会誌 38(6), 396-399, 1996-12-31
The Crystallographic Society of Japan