Geology and petrology of the Ute Mountains area, Colorado.
Ekren, E B; Houser, F N (1965) Geology and petrology of the Ute Mountains area, Colorado. U. S. Geological Survey Professional Paper. 1965. .
| Authors | Ekren, E B; Houser, F N |
|---|---|
| Year | 1965 |
| Title | Geology and petrology of the Ute Mountains area, Colorado. |
| Source | U. S. Geological Survey Professional Paper. 1965. . |
| Publisher | U. S. Geological Survey. Reston, VA, United States. Pages: 74. 1965. |
| Document type | Serial; Report |
| ISSN | 1044-9612 |
| GeoRef | 1965-016503 |
| Keywords | calc-alkalic-composition; Colorado-; composition-; emplacement-; igneous-rocks; interpretation-; intrusions-; major-element-analyses; Mesozoic-; Montezuma-County-Colorado; petrology-; stratigraphy-; trace-element-analyses; United-States; USGS-; Ute-Mountains |
Abstract
Sedimentary rocks exposed in the area aggregate about 3,800 feet in thickness and are Triassic?, Jurassic, Cretaceous, and Quaternary in age. Igneous rocks form a differentiated calc-alkalic series from microgabbro through quartz monzonite. Generally, least siliceous rocks occur as sills or flat-topped laccoliths and more siliceous rocks as mushroom-shaped laccoliths and bysmaliths. All igneous bodies were intruded into sediments forcibly with no evidence of wallrock alteration or assimilation; pre-intrusive fracture zones controlled emplacement of some. Chemical analyses suggest differentiation from a single-source magma. Uranium, vanadium, and copper deposits possibly related to igneous activity occur in McElmo Canyon.
23 samples from this reference
| Sample | Rock name | Major | Trace | Isotope |
|---|---|---|---|---|
| 56-E-46A | Spessartite | yes | ||
| 56-E-77 | Gabbro | yes | ||
| 55-E-48A | Diorite | yes | ||
| 55-E-57A | Diorite | yes | ||
| 56-E-42 | Diorite | yes | ||
| 56-E-33 | Diorite | yes | ||
| EMS-96-52 | Diorite | yes | ||
| CROSS | Granodiorite | yes | ||
| H-515 | Granodiorite | yes | ||
| CROSS | Granodiorite | yes | ||
| EMS-65-52 | Granodiorite | yes | ||
| 56-E-40 | Granodiorite | yes | ||
| 56-E-82 | Granodiorite | yes | ||
| EMS-94-52 | Monzonite | yes | ||
| 56-E-92 | Monzonite | yes | ||
| H465-1 | Monzonite | yes | ||
| EMS-101-52 | Granodiorite | yes | ||
| EMS-64-52 | yes | |||
| Microgabbro | Gabbro | yes | ||
| Diorite porphyry | Diorite | yes | ||
| Granodiorite porphyry | Granodiorite | yes | ||
| Quartz monzonite porphyry | Monzonite | yes | ||
| Lamprophyre | Lamprophyre | yes |