5:15 PM - 6:30 PM
[SIT20-P03] Melting phase relation of hydrous peridotite at the top of the lower mantle
Keywords:hydrous phase, melting, lower mantle, low-velocity anomaly
In order to constrain the melting phase relation of hydrous peridotite at the top of the lower mantle, we conducted high-pressure experiments using a Kawai-type multi-anvil apparatus. The starting material was a powder mixture of natural KLB1 peridotite and brucite + talc as a water source. High-pressure experiments were performed at various pressures from 22 GPa to 28GPa and temperatures from 1200C to 1400C. The recovered samples were observed by scanning electron microscope, and phases were identified by micro-focused X-ray diffractometer, and infrared spectroscopy. In the presentation, we will discuss the origin of the low velocity anomalyfrom the view point ofdehydration melting at the top of the lower mantlebased on the melting phase relation of hydrous peridotite.