Temperature and pressure of mylonitization in a Tertiary extensional shear zone, Ruby Mountains-East Humboldt Range, Nevada: Tectonic implications

Journal Article · Tue Jan 01 00:00:00 EST 1991 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1991)019<0082:TAPOMI>2.3.CO;2· OSTI ID:5796492

Hurlow, H A; Snoke, A W ^[1]; Hodges, K V ^[2]

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1. Univ. of Wyoming, Laramie (USA)
2. Massachusetts Institute of Technology, Cambridge (USA)

In the northern Ruby Mountains-East Humboldt Range metamorphic core complex, a kinematically coupled mylonitic shear zone and brittle-plastic detachment fault compose a low-angle extensional fault system that is mid-Tertiary in age. Geothermobarometry of pelitic schists from the mylonitic shear zone yields a temperature and pressure estimate of 820-900 K (580-620{degree}C) and 310-370 MPa (3.1-3.7 kbar) for mylonite petrogenesis. The shear-zone-detachment-fault system excised 11-12 km of crustal section and accommodated at least 15-17 km of normal-sense dip slip.

• OSTI ID: 5796492
• Journal Information: Geology; (USA), Vol. 19:1; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
GEOLOGIC FORMATIONS
RESERVOIR PRESSURE
RESERVOIR TEMPERATURE
TECTONICS
NEVADA
SCHISTS
PETROGENESIS
GEOLOGIC FAULTS
GEOLOGY
GEOTHERMOMETRY
METAMORPHIC ROCKS
MOUNTAINS
ORIGIN
PETROGRAPHY
TERTIARY PERIOD
CENOZOIC ERA
FEDERAL REGION IX
GEOLOGIC AGES
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
NORTH AMERICA
ROCKS
USA
580000* - Geosciences