Intrusive rocks northeast of Steamboat Springs, Park Range, Colorado
Technical Report
·
OSTI ID:6094037
Major Precambrian and minor Tertiary intrusive rocks northeast of Steamboat Springs in the Park Range between 40/sup 0/30' and 40/sup 0/45' N. lat. are described and compared with related rocks elsewhere in Colorado and Wyoming. The Precambrian intrusives were emplaced in a sequence of high-grade interlayered felsic gneisses, amphibolites, and pelitic schists of sedimentary and volcanic origin. These rocks are cut by a major northeast-trending Precambrian shear zone where mainly left lateral movement of 1/2 to 1 mile is certain. Cumulative movement of many miles is possible. The Precambrian intrusives consist of a batholith, the Mount Ethel pluton, a smaller Buffalo Pass pluton, and small dikes or lenses of fine-grained porphyry, pegmatites, and ultramafics.
- Research Organization:
- Geological Survey, Denver, CO (USA)
- OSTI ID:
- 6094037
- Report Number(s):
- USGS-PP-1041; ON: DE83902180
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
AGE ESTIMATION
CENOZOIC ERA
COLORADO
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
IGNEOUS ROCKS
INTRUSION
ISOTOPE DATING
NORTH AMERICA
PETROGRAPHY
PLUTONIC ROCKS
PRECAMBRIAN ERA
ROCKS
TERTIARY PERIOD
USA
580100* -- Geology & Hydrology-- (-1989)
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
AGE ESTIMATION
CENOZOIC ERA
COLORADO
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
IGNEOUS ROCKS
INTRUSION
ISOTOPE DATING
NORTH AMERICA
PETROGRAPHY
PLUTONIC ROCKS
PRECAMBRIAN ERA
ROCKS
TERTIARY PERIOD
USA