Geophysics

Hot mantle rushes in to fill the void

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Science  16 Feb 2018:
Vol. 359, Issue 6377, pp. 757-758
DOI: 10.1126/science.359.6377.757-d

Volcanism in the western United States over the past 20 million years is tied to the subducting Juan de Fuca and Farallon slabs and mantle dynamics. Zhou et al. present a geodynamic model of the region using past plate motion, current seismic tomographic imaging, and volcanic history. They find that the large amount of intraplate volcanism in the past required the intrusion of hotter mantle below the western United States. This intrusion was driven by the sinking of the ancient Farallon slab beneath the region.

Nat. Geosci. 10.1038/s41561-017-0035-y (2018).

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