Time-evolving surface and subsurface signatures of Quaternary volcanism in the Cascades arc

Daniel O’Hara, Leif Karlstrom, David W. Ramsey

Research output: Contribution to journalArticlepeer-review

Abstract

Increased resolution of data constraining topography and crustal structures provides new quantitative ways to assess province-scale surface-subsurface connections beneath volcanoes. We used a database of mapped vents to extract edifices with known epoch ages from digital elevation models (DEMs) in the Cascades arc (western North America), deriving volumes that likely represent ~50% of total Quaternary eruptive output. Edifice volumes and spatial vent density correlate with diverse geophysical data that fingerprint magmatic influence in the upper crust. Variations in subsurface structures consistent with volcanism are common beneath Quaternary vents throughout the arc, but they are more strongly associated with younger vents. Geophysical magmatic signatures increase in the central and southern Cascade Range (Cascades), where eruptive output is largest and vents are closely spaced. Vents and correlated crustal structures, as well as temporal transitions in the degree of spatially local-ized versus distributed eruptions, define centers with lateral extents of ~100 km throughout the arc, suggesting a time-evolving spatial focusing of magma ascent.

Original languageEnglish
Pages (from-to)1088-1093
Number of pages6
JournalGeology
Volume48
Issue number11
DOIs
Publication statusPublished - 11 Jan 2020

Bibliographical note

Funding Information:
We thank C. Connor, A. Germa, A. Grunder, and M. Guffanti for detailed and constructive reviews. This work was supported by National Science Founda-tion (NSF) grant GRF-1309047 to O’Hara and NSF

Funding Information:
We thank C. Connor, A. Germa, A. Grunder, and M. Guffanti for detailed and constructive reviews. This work was supported by National Science Foundation (NSF) grant GRF-1309047 to O’Hara and NSF

Publisher Copyright:
© 2020. All rights reserved.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

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