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Large-volume granitic plutons in the Burro Mountains, southwestern New Mex-
 

Summary: ABSTRACT
Large-volume granitic plutons in the
Burro Mountains, southwestern New Mex-
ico, cover an area of 1300 km2
and include
biotite leucogranite and biotite-hornblende
granodiorite. These intrusions are part of
the ca. 1.4 Ga granite and rhyolite province
stretching across Laurentia. U-Pb zircon
dating of five samples of the biotite leuco-
granite yielded ages ranging from 1469
12 to 1455 11 Ma (2s uncertainty). Three
samples of granodiorite range from 1470
16 Ma to 1459 14 Ma. All of the zircon
ages are within error and together have a
weighted mean age of 1462 3 Ma, but the
granodiorite is older than the granite based
on crosscutting relationships.
Pressure and temperature estimates from
metapelitic country rock, the first from

  

Source: Amato, Jeff - Department of Geological Sciences, New Mexico State University

 

Collections: Geosciences