Chemical, petrographic, and K-Ar age data to accompany reconnaissance geologic strip map from Kingman to south of Bill Williams Mountain, Arizona

Technical Report · Mon Apr 01 04:00:00 EST 1985

DOI:https://doi.org/10.2172/5517072· OSTI ID:5517072

Arney, B; Goff, F; Eddy, A C

As part of a reconnaissance mapping project, 40 chemical analyses and 13 potassium-argon age dates were obtained for Tertiary volcanic and Precambrian granitic rocks between Kingman and Bill Williams Mountain, Arizona. The dated volcanic rocks range in age from 5.5 +- 0.2 Myr for basalt in the East Juniper Mountains to about 25 Myr for a biotite-pyroxene andesite. The date for Picacho Butte, a rhyodacite in the Mt. Floyd volcanic field, was 9.8 +- 0.07 Myr, making it the oldest rhyodacite dome in that volcanic field. Dated rocks in the Fort Rock area range from 20.7 to 24.3 Myr. No ages were obtained on the Precambrian rocks. Compositionally, the volcanic rocks analyzed range from alkali basalt to rhyolite, but many rocks on the western side of the map area are unusually potassic. The granites chosen for analysis include syenogranite from the Hualapai Mountains, a muscovite granite from the Picacho Butte area, and two other granites. The chemical and K-Ar age data and petrographic descriptions included in this report accompany the reconnaissance geologic strip map published as LA-9202-MAP by Goff, Eddy, and Arney. 9 refs., 4 figs., 2 tabs.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5517072
• Report Number(s): LA-10409-HDR; ON: DE85014242
• Country of Publication: United States
• Language: English

Related Subjects

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58 GEOSCIENCES
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AGE ESTIMATION
ALKALI METAL ISOTOPES
ARGON 40
ARGON ISOTOPES
ARIZONA
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CENOZOIC ERA
CHEMICAL COMPOSITION
DATA
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FEDERAL REGION IX
GEOLOGIC AGES
GRANITES
IGNEOUS ROCKS
INFORMATION
ISOTOPE DATING
ISOTOPES
LIGHT NUCLEI
MAPPING
NORTH AMERICA
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
PETROGRAPHY
PLUTONIC ROCKS
POTASSIUM 40
POTASSIUM ISOTOPES
PRECAMBRIAN ERA
RADIOISOTOPES
ROCKS
STABLE ISOTOPES
TERTIARY PERIOD
USA
VOLCANIC ROCKS
YEARS LIVING RADIOISOTOPES