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The central Colorado volcanic field (CCVF) is a volcanic field in Park County, Colorado.It is located in the southern Rocky Mountains and covered a roughly triangular area centered on the Thirtynine Mile volcanic area and extending from the Sawatch Range southeast to the northern Sangre de Cristo Range and the Wet Mountains and northeast to the southern Front Range south of Denver.
The Thirtynine Mile volcanic area, part of the larger Central Colorado volcanic field, is an extinct volcanic area located in Park and Teller counties, Colorado, northwest of Cripple Creek and southeast of South Park. [1] The area was the site of significant volcanism in the Paleogene Period about 35 million years ago.
Marshall Creek, Thirtynine Mile volcanic area, Central Colorado volcanic field; Colorado; 33.7 Ma; more than 100 cubic kilometres (24 cu mi) of Thorn Ranch Tuff. [8] [51] Mount Aetna (size: 10 km wide), Central Colorado volcanic field; Colorado; 33.81 Ma, 100 cubic kilometres (24 cu mi) of Badger Creek Tuff. [8] [52]
Central Colorado volcanic field; S. San Juan volcanic field This page was last edited on 2 January 2016, at 18:52 (UTC). Text is available under the Creative Commons ...
Central Colorado volcanic field: Thirtynine Mile Mountain, elevation 11,553 ft (3,521 m), is a summit in the Front Range of the Pike National Forest in central Colorado.
The lineament is defined by aligned volcanic fields and several calderas in the area, including the Valles Caldera National Preserve in the Jemez Mountains. The Jemez Lineament is thought to be a hydrous subduction zone scar, separating Precambrian basement rock of the Yavapai-Mazatzal transition zone from the Mazaztl Province proper.
La Garita Caldera erupts in the Wheeler Geologic Area, Central Colorado volcanic field, Colorado, USA, eruption several VEI 8 events (Possibly as high as a VEI 9), 5,000 cubic kilometers (1,200 cu mi) of Fish Canyon Tuff was blasted out in a single, major eruption about 27.8 million years ago. [52] [86] [87]
Dacite is a silicic volcanic rock common in explosive eruptions, lava domes and short thick lava flows. There are also large intracaldera lavas composed of andesite , a volcanic rock compositionally intermediate between basalt (poor in silica content) and dacite (higher silica content) in the La Garita Caldera.