Pliocene to Late Pleistocene Magmatism in the Aurora Volcanic Field, Nevada and California, USA: A Petrographic, Geochemical, and Isotopic Study

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  • The Pliocene-Pleistocene Aurora Volcanic Field (AVF) covers 325 km2, stretches across the California-Nevada border north of Mono Lake, and overlaps the Miocene Bodie Hills Volcanic Field (BHVF). It lies within the northwest-striking Walker Lane shear zone at the western margin of the Basin and Range province. Although erupted in a post-subduction setting, normalized incompatible element patterns show a continental arc-like signature, similar to those of other late Cenozoic volcanic fields within the Walker Lane, interpreted to reflect a metasomatized lithospheric mantle source.Petrographic features suggest syn-magmatic open system processes. While trace element compositions show few signs of these processes, the range in isotopic ratios confirm them. The BHVF and the AVF rocks have similar Pb isotope ratios, however, the AVF rocks have higher 87Sr/86Sr, lower 143Nd/144Nd, and stronger correlations between 87Sr/86Sr, silica, and δ18O, indicating that crustal assimilation was a more influential process in the AVF than in the BHVF.

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  • Copyright © 2016 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
Date Created
  • 2016


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