Potrillo Volcanic Field - Peridotite Xenoliths

Peridotite Xenoliths

Kilbourne Hole xenoliths are divided according to their textures into:

1. fine grained lherzolite
2. protogranular to porphyroclastic lherzolite
3. porphyroclastic olivine-rich peridotite

   • Age: Middle-late Quaternary: 1-Ma – 8-ka
   • Temperatures: Equigranular 978-984 C, lherzolite 1020-1044 C, olivine-rich 1052-1184 C
   • Xenoliths were derived from 35 to 70 km deep
   • Calculated P-wave velocities for Peridotite range from 7.75 km/s to 7.89 km/s
   • Rio Grande Rift P-wave velocities range from 7.6 km/s to 7.8 km/s