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dc.contributor.authorRichard, S.M.
dc.contributor.authorMcWilliams, M.O.
dc.contributor.authorGans, P.B.
dc.date.accessioned2018-09-29T02:07:40Z
dc.date.available2018-09-29T02:07:40Z
dc.date.issued1998
dc.identifier.citationRichard, 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.
dc.identifier.urihttp://hdl.handle.net/10150/629622
dc.descriptionThis 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.
dc.language.isoen
dc.relation.ispartofseriesOFR-98-25
dc.relation.urlhttp://repository.azgs.az.gov/uri_gin/azgs/dlio/980
dc.rightsArizona Geological Survey. All rights reserved.
dc.subjectArizona Geological Survey Open File Reports
dc.subjectLa Paz County
dc.subjectYavapai County
dc.subjectArizona
dc.subjectHarquahala Mountains
dc.subjectLittle Harquahala Mountains
dc.subjecttemperature
dc.subjectraw data
dc.subjectthermal
dc.subjectGeology
dc.subjectmineralization
dc.subjectsamples
dc.subjectanalytical data
dc.subjectEarly Tertiary
dc.subjectJurassic
dc.subjectcretaceous
dc.subjectMiddle Tertiary
dc.subjectMaricopa County
dc.subjectBasin and Range Province
dc.subjectgeochronology
dc.subjecttectonite
dc.subjectsericitized granite
dc.subjectamphibolite
dc.subjectgranodiorite
dc.subjectgranite
dc.subjectcooling history
dc.title40Ar/39 Dates from the Harquahala and Little Harquahala Mountains, west-central Arizona. Part I
csdgm.bounding.west-113.601
csdgm.bounding.east-113.11
csdgm.bounding.north33.9141
csdgm.bounding.south33.6173
dc.description.collectioninformationDocuments 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.
refterms.dateFOA2018-09-29T02:07:40Z


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