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.
Citation Information
| Publication Year | 2001 |
|---|---|
| Title | Geochronology and geology of late Oligocene through Miocene volcanism and mineralization in the western San Juan Mountains, Colorado |
| DOI | 10.3133/pp1642 |
| Authors | Dana J. Bove, Ken Hon, Karin E. Budding, John F. Slack, Lawrence W. Snee, Ross A. Yeoman |
| Publication Type | Report |
| Publication Subtype | USGS Numbered Series |
| Series Title | Professional Paper |
| Series Number | 1642 |
| Index ID | pp1642 |
| Record Source | USGS Publications Warehouse |
| USGS Organization | Eastern Mineral and Environmental Resources Science Center |