U-Pb isotope geochronologic data from 23 igneous rock units in cental and southeastern Arizona
KeywordsArizona Geological Survey Open File Reports
Las Guijas Mountains
New River Mountains
single zircon crystals
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CitationSpencer, J.E., Isachsen, C.E., Ferguson, C.A., Richard, S.M., Skotnicki, S.J., Wooden, J., and Riggs, N.R., 2003, U-Pb isotope geochronologic data from 23 igneous rock units in cental and southeastern Arizona. Arizona Geological Survey Open File Report, OFR-03-08, 40 p.
DescriptionGeochronologic analyses of igneous rocks were done over the past several years as part of the joint State-Federal STATEMAP program. These analyses were done to determine the age of rocks in areas where Arizona Geological Survey geologists were making geologic maps at 1 :24,000 scale or compiling geologic maps at 1: 100,000 scale. Geochronologic analyses are a basic component of geologic map making in areas where igneous rocks are present but their ages are poorly known. Most ofthe dates reported here are the result of laboratory analyses by Clark Isachsen at the University of Arizona Department of Geosciences, and were determined in most cases by analysis of single zircon crystals from the rock samples. Two dates were produced at the US Geological Survey in Menlo Park, California, by Joe Wooden, and two are from samples collected by Nancy Riggs and analyzed at UC Santa Barbara. These analyses used multiple zircon crystals divided into size fractions for each laboratory analysis. Sample locations and descriptions are reported in Table 1, and basic geochronologic results are reported in Table 2. Concordia diagrams and analytical data are given in Appendix A. ( 40 pages)
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North Bounding Coordinate34.2708
South Bounding Coordinate31.3536
West Bounding Coordinate-112.566
East Bounding Coordinate-109.05
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