Proterozoic geology of the northern half of the Mount Evans 7.5-minute quadrangle, The
The Picuris orogeny was a 1450 Ma to 1360 Ma convergent tectonic event that left a deeply rooted orogenic belt across central Arizona, northern New Mexico, and Colorado. Mechanisms for the Picuris orogeny are debated, in large part due to early Mesoproterozoic plutonism that emplaced a belt of generally felsic, `anorogenic' intrusions spanning presentday North America from southern California to Newfoundland. While the majority of these intrusions do have geochemical signatures indicative of mantle upwelling and crustal extension, several plutons in the southwestern United States have major ...
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