| Autor: |
Holliday, McKenna E., Rivera, Tiffany, Jicha, Brian, Trayler, Robin B., Biek, Robert F., Braunagel, Michael J., Griffith, W. Ashley, Hacker, David B., Malone, David H., Mayback, Danika F. |
| Předmět: |
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| Zdroj: |
Terra Nova; Feb2023, Vol. 35 Issue 1, p66-72, 7p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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