Database for the Geologic Map of the Bonanza Caldera Area, Northeastern San Juan Mountains, Colorado

Creators: U.S. Geological Survey, ALASKA REGION

Year: 2020

Location: Gunnison Basin, Colorado

Bounding box: 37.996°N to 38.505°N, -106.385°W to -105.873°W

Publisher: USGS

Tags: USGS Science Data Catalog (SDC), volcanoes, geology, caldera, explosive eruptions, Colorado, Saguache, North America, United States, Bonanza, Volcanology, Geology & Tectonics, Geochemistry & Isotopes, Gunnison Basin, Western Colorado Landscapes

Description

The San Juan Mountains in southwestern Colorado have long been recognized as a site of exceptionally voluminous mid-Tertiary volcanism, including at least 24 major ignimbrite sheets (each 150-5,000 km3) and associated caldera structures active at 33-23 Ma. More recent volcanologic and petrologic studies in the San Juan region have focused mainly on several ignimbrite-caldera systems: the southeastern area (Platoro complex), western calderas (Uncompahgre-Silverton-Lake City), the central cluster (La Garita-Creede calderas). The northeast San Juan region that was far less studied until recently occupies a transition between earlier volcanism in central Colorado and the larger-volume younger ignimbrite-caldera foci farther south and west. [...]

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