Event Title

Testing Models of Subduction Initiation and Metamorphic Sole Formation in the Easton Metamorphic Suite, NW Cascades

Research Mentor(s)

Mulcahy, Sean

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.

Document Type

Event

Start Date

15-5-2019 9:00 AM

End Date

15-5-2019 5:00 PM

Location

Carver Gym (Bellingham, Wash.)

Department

Geology

Genre/Form

student projects, posters

Subjects – Topical (LCSH)

Subduction zones--Cascade Range; Metamorphic rocks--Cascade Range

Geographic Coverage

Cascade Range

Type

Image

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

Language

English

Format

application/pdf

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May 15th, 9:00 AM May 15th, 5:00 PM

Testing Models of Subduction Initiation and Metamorphic Sole Formation in the Easton Metamorphic Suite, NW Cascades

Carver Gym (Bellingham, Wash.)

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.