Chemical, petrographic, and K-Ar age data to accompany reconnaissance geologic strip map from Kingman to south of Bill Williams Mountain, Arizona
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. (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5517072
- Report Number(s):
- LA-10409-HDR; ON: DE85014242
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
ARIZONA
GRANITES
VOLCANIC ROCKS
CHEMICAL COMPOSITION
ISOTOPE DATING
ARGON 40
EXPERIMENTAL DATA
MAPPING
PETROGRAPHY
POTASSIUM 40
PRECAMBRIAN ERA
TERTIARY PERIOD
AGE ESTIMATION
ALKALI METAL ISOTOPES
ARGON ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CENOZOIC ERA
DATA
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
FEDERAL REGION IX
GEOLOGIC AGES
IGNEOUS ROCKS
INFORMATION
ISOTOPES
LIGHT NUCLEI
NORTH AMERICA
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
PLUTONIC ROCKS
POTASSIUM ISOTOPES
RADIOISOTOPES
ROCKS
STABLE ISOTOPES
USA
YEARS LIVING RADIOISOTOPES
580400* - Geochemistry- (-1989)
580300 - Mineralogy
Petrology
& Rock Mechanics- (-1989)
580100 - Geology & Hydrology- (-1989)
510300 - Environment
Terrestrial- Radioactive Materials Monitoring & Transport- (-1989)