35 Future Directions in Mineralogy and Petrology: A Session for Undergraduate and Graduate Researchers (Posters)

Friday, 5 May 2023
1:30 PM - 5:30 PM
EC 215

MILLION-YEAR MELT-PRESENCE IN MOGOLLON DATIL VOLCANIC FIELD RHYOLITES: CONSTRAINING THE HISTORIES OF THE BURSUM CALDERA RESURGENT DOMES

Paper number: 35-6
Program: Theme Sessions
Time: 1:30 PM – 5:30 PM

Authors

Abstract

The Mogollon-Datil Volcanic Field (MDVF) located in southwestern New Mexico is the result of punctuated volcanism and the transition between arc and rift magmatism. Volcanism showcases the transition from caldera forming ignimbrite eruptions during ignimbrite flare-up to basaltic andesite eruptions between 36 Ma and 24 Ma. Here we seek to understand the temporal and spatial relationship of the resurgent domes related to the 28 Ma Bursum caldera. These rocks represent the transition from the last gasps of rhyolite to basaltic andesite volcanism which occurs abruptly between 27-26 Ma. To accomplish this, we use a combination of new zircon U-Pb ages and trace element contents with previously collected whole rock and mineral trace element contents and isotope geochemistry. We test the hypothesis that the resurgent domes are related in space and time but sourced by different pockets of melt extracted as the result of remobilization of cold storage mushes by injection of intermediate composition magmas. We suggest that residual magma was maintained near solidus for greater than 1 m.y. after caldera collapse by the injection of new andesite magmas into the system and remained locally viable for at least some time after injection. The magmas feeding the resurgent domes contain zircons that are geochemically distinct from the Bursum caldera ignimbrites.

Geological Society of America Abstracts with Programs. Vol. 55, No. 3

doi: 10.1130/abs/2023NC-386945

© Copyright 2023 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.