Large-scale, peralkaline granitoid-related Nb-Zr-REE deposit, hosted in a riebeckite granite (Rb-Sr isotopic age: 125 Ma) intruding Middle Jurassic volcanic rock and occurring in two areas. The western part of the intrusion covers an area of 0.11 km2, the eastern part covers an area of 0.24 km2, and at the depth, the two parts merge. In the eastern intrusion, from the surface to depth, successive zones of pegmatitic granite, albite-altered granite and porphyritic riebeckite granite occur. The rocks are rich in heavy REE, and Eu is intensely depleted.
Ref.:
- Orris, G.J., and Grauch, R.I. (2002): USGS Open-File Report 02-189
- http://wrgis.wr.usgs.gov/open-file/of03-220/DATABASE/lode_deposits.txt
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Map Reference: 45°28'N , 120°40'E
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