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Ortega Formation Kyanite + Sillimanite + Andalucite schist

View on map:36.293400°N 105.714900°W

Comments

There is no trail to the site and you need to climb 300 meters to the outcrop.  It is rare to find kyanite, sillimanite, and andalucite together in a metamorphic rock so the authors ask that you be respectful of the outcrop.  The schist contains andalusite in cm sizes along with kyanite and prismatic sillimanite.  Ages put the schist at 1.4 to 1.3 billion years old.  The schist skirted the triple point for the minerals.  Stop 2 of Daniel et al. 

References

  • Page 224 - Daniel, C. G. et al., 2016, Regional Al2SiO5 triple-point metamorphic rocks of northern New Mexico: A field trip to honor the career contributions of Lincoln Hollister to petrology and tectonics: Geol. Soc. Am. Field Guide 44, p. 201- 229.
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