Summary of potassium/argon age dating, 1979

Technical Report · Fri Feb 01 04:00:00 EST 1980

DOI:https://doi.org/10.2172/5166169· OSTI ID:5166169

Evans, Jr, S H

During FY-79 the K/Ar dating laboratory at the Department of Geology and Geophysics of the University of Utah became operational. During the past calendar year forty-seven dates have been produced from areas predominantly in Utah. Dating has also been done on areas in Nevada and Montana through the State-Coupled program and Case Studies Support program. Areas in wich activity was concentrated include: Cove Creek Domes/Twin Peaks Area, SW Utah. Here volcanic activity spanned the time from 2.74 to 2.35 M.Y., with a mean age of 2.50 +- 0.14 M.Y. Black Rock Desert, SW Utah. Two dates on a single flow indicate an age of 1.49 +- 0.08 M.Y. for a flow previously undated. Wildcat Creek Area, SW Utah. Dating of rhyolite flows from this area gives a mean age of volcanism of 9.25 +- 0.16 M.Y., considerably older than previously inferred by the work of Haugh (1978). Mineral Mountains Pluton, SW Utah. Twelve dates on phases of the pluton indicate a complex history of intrusion, and more work is indicated in order to derive a coherent picture of the magmatic events leading to the formation of this batholith. Blackfoot Reservoir, Idaho. Two dates on rhyolite domes, previously updated, give ages of 1.56 +- 0.06 M.Y. and 1.28 +- 0.15 M.Y.

• Research Organization: Utah Univ., Salt Lake City (USA). Dept. of Geology and Geophysics
• DOE Contract Number: AC07-78ET28392
• OSTI ID: 5166169
• Report Number(s): DOE/ET/28392-41
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150201* -- Geology & Hydrology of Geothermal Systems-- USA-- (-1989)
AGE ESTIMATION
AMPHIBOLE
ANORTHOSITES
BASALT
BIOTITE
GABBROS
Geothermal Legacy
IGNEOUS ROCKS
INTRUSION
ISOTOPE DATING
MICA
MINERALS
MONTANA
NEVADA
NORTH AMERICA
PLUTONIC ROCKS
RHYOLITES
ROCKS
ROCKY MOUNTAIN REGION
USA
UTAH
VOLCANIC REGIONS
VOLCANIC ROCKS
VOLCANISM
WESTERN REGION