Geochronology and geology of late Oligocene through Miocene volcanism and mineralization in the western San Juan Mountains, Colorado

Professional Paper 1642
By: , and 

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Abstract

This paper presents 25 new 40Ar/39Ar dates from the main calc-alkaline ash-flow sheets and related younger plutons of the western San Juan volcanic field, the ash-flow sheets of the Lake City caldera cycle, and veins and other altered rocks in the Lake City region. The goal of the study was to produce similar quality 40Ar/39Ar ages to those currently published for the eastern and central San Juan Mountains. These new data provide a much more precise chronological framework for interpreting durations of events and their relationship to mineralization than do previously published conventional K-Ar dates for the western San Juan Mountains.

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Geochronology and geology of late Oligocene through Miocene volcanism and mineralization in the western San Juan Mountains, Colorado
Series title Professional Paper
Series number 1642
DOI 10.3133/pp1642
Edition -
Year Published 2001
Language ENGLISH
Contributing office(s) Eastern Mineral and Environmental Resources Science Center
Description 30 p.
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