Summary of the geology of the northern part of the Sierra Cuchillo, Socorro and Sierra Counties, southwestern New Mexico
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Abstract
The northern part of the Sierra Cuchillo is located within the northeastern part of the Mogollon-Datil volcanic field west of the Rio Grande rift in the Basin and Range Province, approximately 50 km northwest of Truth or Consequences in south-central New Mexico. The Sierra Cuchillo is a north-south, elongated horst block composed of Tertiary volcanic and intrusive rocks, sparse outcrops of Lower Permian and Upper Cretaceous rocks, and sediments of the Tertiary-Quaternary Santa Fe Group. The horst is composed mainly of a basal volcanic rock sequence of andesite-latite lava flows and mud-flow breccias with a 40Ar/39Ar isotopic age of about 38 Ma. The sequence is locally intruded by numerous dikes and plugs that range in composition from basaltic andesite through rhyolite and granite. The andesite-latite sequence is overlain by ash-flow tuffs and a complex of rhyolitic lava flows and domes. Some of these units are locally derived and some are outflow sheets derived from calderas in the San Mateo Mountains, northeast of the study area. These locally derived units and outflow sheets range in age from 28 to 24 Ma.
Study Area
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Summary of the geology of the northern part of the Sierra Cuchillo, Socorro and Sierra Counties, southwestern New Mexico |
| Year Published | 2012 |
| Language | English |
| Publisher | The New Mexico Geological Society |
| Contributing office(s) | Geology and Environmental Change Science Center |
| Description | 8 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | New Mexico Geological Society Fall Field Conference Guidebook - 63 Geology of the Warm Springs Region |
| First page | 211 |
| Last page | 218 |
| Country | United States |
| State | New Mexico |
| County | Sierra County, Socorro County |
| Google Analytic Metrics | Metrics page |