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    40Ar/39 Dates from the Harquahala and Little Harquahala Mountains, west-central Arizona. Part I

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    Author
    Richard, S.M.
    McWilliams, M.O.
    Gans, P.B.
    Issue Date
    1998
    Keywords
    Arizona Geological Survey Open File Reports
    La Paz County
    Yavapai County
    Arizona
    Harquahala Mountains
    Little Harquahala Mountains
    temperature
    raw data
    thermal
    Geology
    mineralization
    samples
    analytical data
    Early Tertiary
    Jurassic
    cretaceous
    Middle Tertiary
    Maricopa County
    Basin and Range Province
    geochronology
    tectonite
    sericitized granite
    amphibolite
    granodiorite
    granite
    cooling history
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    Citation
    Richard, S.M., McWilliams, M.O., and Gans, P.B., 1998, 40Ar/39 Dates from the Harquahala and Little Harquahala Mountains, west-central Arizona. Part I. Arizona Geological Survey Open File Report, OFR-98-25, 25 p.
    Description
    This report includes the analytical data for four 40Ar/39Ar cooling dates from samples collected in the Harquahala and Little Harquahala Mountains of west-central Arizona. The samples were collected to constrain the cooling history and timing of mineralization in this area [Richard et aI., 1990; Richard, 1988]. Analyses were done at Stanford University. For each of the 4 samples described here, an incremental thermal release age spectra is included, along with a table summarizing the data used to calculate ages, and a table of raw data from each temperature increment. Argon correlation diagrams are included for each sample, on which the ratio of 4°Ar (radiogenic and atmospheric) to 36Ar is plotted against the ratio 39 ArP6Ar. The regression lines used to calculate isochron ages are indicated on the plots. Regressions were calculated using a simple least squares method. For the hornblende samples, a K/Ca ratio plot is included above the age spectra to provide an indication of the compositional consistency of the degassed material in each temperature increment.
    URI
    http://hdl.handle.net/10150/629622
    Additional Links
    https://library.azgs.arizona.edu/
    Language
    en
    Series/Report no.
    OFR-98-25
    Rights
    Arizona Geological Survey. All rights reserved.
    Collection Information
    Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
    North Bounding Coordinate
    33.9141
    South Bounding Coordinate
    33.6173
    West Bounding Coordinate
    -113.601
    East Bounding Coordinate
    -113.11
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