Testing Models of Subduction Initiation and Metamorphic Sole Formation in the Easton Metamorphic Suite, NW Cascades
2019
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Artifact Description
Metamorphic soles are thin slivers (<500 m) of high-grade rock that record the first few million years of intra-oceanic subduction when the down-going slab is accreted to the upper plate and heated by the overlying mantle (e.g. Agard et al., 2016). Metamorphic soles preserve an inverted metamorphic gradient and form either as a coherent unit that has been subducted and cooled (Peacock, 1987), or as a sequence of units that are progressively underplated and accreted (Soret et al., 2017). Despite their importance to understanding early subduction processes, the mechanisms responsible for creating metamorphic soles remain poorly understood. This study aims to answer the question: Does the inverted metamorphic sequence of metamorphic soles form by downward heat advection or by underplating and accretion? I will test this hypothesis within the Easton Metamorphic Suite of NW Washington that preserves a metamorphic sole formed during initiation of subduction beneath the North American margin.
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