The Yellowstone magmatic system from the mantle plume to the upper crust

The Yellowstone supervolcano is one of the largest active continental silicic volcanic fields in the world. An understanding of its properties is key to enhancing our knowledge of volcanic mechanisms and corresponding risk. Using a joint local and teleseismic earthquake P-wave seismic inversion, we...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2015-05, Vol.348 (6236), p.773-776
Main Authors: Huang, Hsin-Hua, Lin, Fan-Chi, Schmandt, Brandon, Farrell, Jamie, Smith, Robert B., Tsai, Victor C.
Format: Article
Language:English
Subjects:
Crusts
Estimates
Links
Magma
Mantle
Plumes
Reservoirs
Volcanic activity
Volcanoes
Volcanology
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Summary:The Yellowstone supervolcano is one of the largest active continental silicic volcanic fields in the world. An understanding of its properties is key to enhancing our knowledge of volcanic mechanisms and corresponding risk. Using a joint local and teleseismic earthquake P-wave seismic inversion, we revealed a basaltic lower-crustal magma body that provides a magmatic link between the Yellowstone mantle plume and the previously imaged upper-crustal magma reservoir. This lower-crustal magma body has a volume of 46,000 cubic kilometers, ∼4.5 times that of the upper-crustal magma reservoir, and contains a melt fraction of ∼2%. These estimates are critical to understanding the evolution of bimodal basaltic-rhyolitic volcanism, explaining the magnitude of CO2 discharge, and constraining dynamic models of the magmatic system for volcanic hazard assessment.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.aaa5648