K--Ar dating quaternary and Neogene volcanic rocks of the Snake River Plain, Idaho

Journal Article · Sat Mar 01 04:00:00 EDT 1975 · Am. J. Sci.; (United States)

DOI:https://doi.org/10.2475/ajs.275.3.225· OSTI ID:7295412

Armstrong, R L ^[1]; Leeman, W P; Malde, H E

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1. Yale Univ., New Haven

Ninety-eight K-Ar dates for lavas of the Snake River Plain (SRP) and vicinity provide calibration for the stratigraphic framework discussed by Malde and Powers (1962). The Idavada Volcanics, predominantly silicic volcanic rocks, are 9 to 13 m.y. old in the western SRP. Rocks of similar type and comparable stratigraphic position are 8 to 10 m.y. old in the central SRP and as young as 4 to 5 m.y. old in the eastern SRP. This time-transgressive silicic volcanic assemblage merges in the east with the silicic volcanic units erupted during the last 2 m.y. from Island Park, Yellowstone, and related volcanic centers. The Idaho Group, consisting of intercalated basalt flows and sedimentary deposits in the western half of the SRP, ranges in age from about 0.6 to 11.5 m.y. (71 refs.)

• OSTI ID: 7295412
• Journal Information: Am. J. Sci.; (United States), Journal Name: Am. J. Sci.; (United States) Vol. 275:3; ISSN AJSCA
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150201* -- Geology & Hydrology of Geothermal Systems-- USA-- (-1989)
AGE ESTIMATION
ALKALI METALS
ARGON
BASALT
CHALCOGENIDES
ELEMENTS
IDAHO
IGNEOUS ROCKS
ISOTOPE DATING
LAVA
METALS
MINERALS
NONMETALS
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
PACIFIC NORTHWEST REGION
POTASSIUM
RARE GASES
ROCKS
SEDIMENTARY ROCKS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
USA
VOLCANIC ROCKS