Emplacement age of the Markagunt gravity slide in southwestern Utah, USA

McKenna E. Holliday, Tiffany Rivera, Brian Jicha, Robin B. Trayler, Robert F. Biek, Michael J. Braunagel, W. Ashley Griffith, David B. Hacker, David H. Malone, Danika F. Mayback

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The Markagunt gravity slide (MGS) is a large-volume landslide in southwestern Utah that originated within the Oligocene-Miocene Marysvale volcanic field. Gravity slides are single emplacement events with long runout distances and are now recognized as a new class of volcanic hazard. Accumulation of volcanic material on a structurally weak substrate along with voluminous shallow intrusive events led to collapse. Here, 40Ar/39Ar data for landslide-generated pseudotachylyte, the landslide-capping Haycock Mountain Tuff and the deformed Osiris Tuff are combined with a Bayesian age model to determine an emplacement age of 23.05 + 0.22/−0.20 Ma for the MGS. The results suggest a lag time of <200 kyr between the caldera-forming eruption of the Osiris Tuff, additional buildup of the unstable volcanic pile and subsequent mass movement.

Original languageEnglish (US)
Pages (from-to)66-72
Number of pages7
JournalTerra Nova
Volume35
Issue number1
DOIs
StatePublished - Feb 2023
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank Klaus Mezger, Stefan Schmalholz and Seth Burgess for their recommendations to improve this manuscript. Funding for this research was provided by the National Science Foundation (EAR‐2113156). Samples for this work were obtained from the homelands of the Ute, Southern Paiute and Goshute people. We thank B. Nash for her initial analyses of the pseudotachylyte. Additional field and laboratory assistance was provided by P. Lippert and S. Brosson (University of Utah) and E. Kleber (Utah Geologic Survey).

Funding Information:
The authors thank Klaus Mezger, Stefan Schmalholz and Seth Burgess for their recommendations to improve this manuscript. Funding for this research was provided by the National Science Foundation (EAR-2113156). Samples for this work were obtained from the homelands of the Ute, Southern Paiute and Goshute people. We thank B. Nash for her initial analyses of the pseudotachylyte. Additional field and laboratory assistance was provided by P. Lippert and S. Brosson (University of Utah) and E. Kleber (Utah Geologic Survey).

Publisher Copyright:
© 2022 John Wiley & Sons Ltd.

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