U-Pb geochronologic data from zircons from eleven granitic rocks in central and western Arizona

Isachsen, C.E.; Gehrels, G.E.; Riggs, N.R.; Spencer, J.E.; Ferguson, C.A.; Skotnicki, S.J.; Richard, S.M.

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Isachsen, C.E., Gehrels, G.E., Riggs, N.R., Spencer, J.E., Ferguson, C.A., Skotnicki, S.J., and Richard, S.M., 1999, U-Pb geochronologic data from zircons from eleven granitic rocks in central and western Arizona. Arizona Geological Survey Open File Report, OFR-99-05, 27 p.

Description

The U-Pb data described in this report were produced to determine the ages of granitic rocks in Arizona and the timing of metamorphic and deformational events. Two developments emerge from the data reported here that are especially significant. Two granites, one from the Mazatzal Mountains east of Phoenix and one from the Santan Mountains southeast of Phoenix, yielded dates between 1630 and 1640 Ma. This is unusually young for early Proterozoic granites in Arizona, although two granites in the Maricopa Mountains southwest of Phoenix have yielded similar dates (Eisele and Isachsen, in review; Joe Wooden, written communication, 1998). Possibly, these dated granites are part of a belt of similar-age granites that roughly occupy the boundary between Pinal Schist on the southeast and metavolcanic and metasedimentary rocks of the Tonto Basin Supergroup to the northwest (Conway and Silver, 1989; Reynolds and Dewitt, 1991).

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http://hdl.handle.net/10150/630032

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https://library.azgs.arizona.edu/

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Series/Report no.

OFR-99-05

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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

35.3558

South Bounding Coordinate

32.9007

West Bounding Coordinate

-114.675

East Bounding Coordinate

-112.5

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AZGS Document Repository