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Rupturing Farallon slab formed Columbia River flood basalt

Rupturing Farallon slab formed Columbia River flood basalt. [Liu & Stegman, Nature 2012]. Modeling western US seismic structure requires the Farallon slab to break ~16 Ma, and the slab tearing coincides with the sequence of CRB eruptions both in space and time (upper right) .

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Rupturing Farallon slab formed Columbia River flood basalt

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  1. Rupturing Farallon slab formed Columbia River flood basalt [Liu & Stegman, Nature 2012] • Modeling western US seismic structure requires the Farallon slab to break ~16 Ma, and the slab tearing coincides with the sequence of CRB eruptions both in space and time (upper right). • The slab tear involves a focused asthenosphere upwelling (lower right), suggesting that the CRB magmas are from re-melting of the subducting oceanic lithosphere and oceanic crust. Geometry of the subducting Farallon slab and mantle flow The slab tear causing CRB is now imaged by tomography 0 Ma 15 Ma

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