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Espinosa-Ortiz-Cerrillos volcanic field

Location: 
35°15'16.6"N, 106°21'48"W
Type: 
Mostly intermediate composition (monzonitic) intrusions and a few mesa-capping basaltic lava flows; local alteration and mineral deposits including turquoise
Age: 
20 - 37 Ma
Significance: 
The Ortiz Mountains are the site of an active gold mine and the site of the first gold rush in the continent; the Cerillos monzonite intrusions are famous for the turquoise that was mined there in the 19th century
Composition: 
Mostly monzonite
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