Metamorphic conditions in the Ashe Metamorphic Suite, North Carolina Blue Ridge
Journal Article
·
· Geology; (USA)
- Univ. of Tennessee, Knoxville (USA)
- Appalachian State Univ., Boone, NC (USA)
Taconian metamorphism of mafic rocks in the Ashe Metamorphic Suite can be characterized by reference to an isograd corresponding to the reaction bio + epi = hbl + gar, which separates rocks into two zones of low-variance assemblages. Temperatures and pressures estimated from mineral exchange geothermometers and a barometer suggest that this reaction occurred at approximately 600-650C and 7.5 kbar. Phase equilibria between biotite and hornblende, as well as the sharpness of the mapped isograd, indicate that the reaction is discontinuous. Inferred differences in metamorphic grade between Ashe amphibolites and mafic dikes in the underlying basement suggest that these units are in faulted contact. Isograd patterns in pelitic rocks suggest an elongated domal uplift that developed after metamorphism and thrusting, the core of which is exposed in the adjacent Grandfather Mountain window.
- OSTI ID:
- 6966949
- Journal Information:
- Geology; (USA), Journal Name: Geology; (USA) Vol. 17:12; ISSN GLGYB; ISSN 0091-7613
- Country of Publication:
- United States
- Language:
- English
Similar Records
Radiometric ages related to the timing of Paleozoic metamorphism and deformation in the Blue Ridge of northwestern North Carolina
K-Ar ages of allochthonous mafic and ultramafic complexes and their metamorphic aureoles, Western Brooks Range, Alaska
{sup 40}Ar/{sup 39}Ar thermochronology and thermobarometry of metamorphism, plutonism, and tectonic denudation in the Old Woman Mountains area, California
Conference
·
Tue Dec 31 23:00:00 EST 1991
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5807688
K-Ar ages of allochthonous mafic and ultramafic complexes and their metamorphic aureoles, Western Brooks Range, Alaska
Conference
·
Sun Mar 31 23:00:00 EST 1985
· Am. Assoc. Pet. Geol., Bull.; (United States)
·
OSTI ID:6330285
{sup 40}Ar/{sup 39}Ar thermochronology and thermobarometry of metamorphism, plutonism, and tectonic denudation in the Old Woman Mountains area, California
Journal Article
·
Fri Jan 31 23:00:00 EST 1992
· Geological Society of America, Bulletin
·
OSTI ID:543081
Related Subjects
58 GEOSCIENCES
580000* -- Geosciences
AMPHIBOLE
BASEMENT ROCK
BIOTITE
DEFORMATION
DIKES
FEDERAL REGION IV
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOLOGY
HORNBLENDE
LITHOLOGY
METAMORPHIC ROCKS
METAMORPHISM
MICA
MINERALS
NORTH AMERICA
NORTH CAROLINA
PHASE STUDIES
RESERVOIR PRESSURE
RESERVOIR TEMPERATURE
ROCKS
SILICATE MINERALS
STRATIGRAPHY
TECTONICS
USA
580000* -- Geosciences
AMPHIBOLE
BASEMENT ROCK
BIOTITE
DEFORMATION
DIKES
FEDERAL REGION IV
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOLOGY
HORNBLENDE
LITHOLOGY
METAMORPHIC ROCKS
METAMORPHISM
MICA
MINERALS
NORTH AMERICA
NORTH CAROLINA
PHASE STUDIES
RESERVOIR PRESSURE
RESERVOIR TEMPERATURE
ROCKS
SILICATE MINERALS
STRATIGRAPHY
TECTONICS
USA