9 D6. Tectonics/Tectonophysics (Posters)

Tuesday, 12 May 2020
9:00 AM - 6:00 PM
Fountain Ballroom

CRUSTAL MELTING IN THE SOUTHERN CORDILLERA: THE PAN-TAK GRANITE OF THE COYOTE MOUNTAINS METAMORPHIC CORE COMPLEX, ARIZONA

Paper number: 9-4
Program: Technical Sessions
Time: 9:00 AM – 6:00 PM

Authors

Abstract

The Pan-Tak granite in the Coyote Mountain metamorphic core complex is an early Paleogene peraluminous leucogranite located ~45km southwest of Tucson, Arizona. The Pan-Tak granite is interpreted as the product of crustal melting of Proterozoic metapelitic rocks, which makes it part of a belt of peraluminous, two-mica +/- garnet, leucogranites associated with core complexes that stretches from British Columbia, Canada to Sonora, Mexico. Crystallization ages of anatectic intrusive rocks in the northern Cordillera (e.g., Shuswap complex) correlate well with exhumation ages of their respective core complexes, suggesting decompression melting as a primary mechanism for melt production. However, exhumation/cooling ages and crystallization ages related to anatexis in the Coyote Mountains diverge by ca. 30 Ma. Therefore, other process may be required to explain melting including: crustal thickening, magmatic heating, and fluid-flux. We present new geochronological and geochemical data to help resolve the origin of the Pan Take granite and its relationship to the tectonic history of southern Arizona.

Geological Society of America Abstracts with Programs. Vol. 52, No. 4

doi: 10.1130/abs/2020CD-347175

© Copyright 2020 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.