Sharp thermal transition in the forearc mantle wedge as a consequence of nonlinear mantle wedge flow

Ikuko Wada, Catherine A. Rychert, Kelin Wang

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    In the forearc mantle wedge, the thermal field depends strongly on slab-driven mantle wedge flow. The flow is in turn affected by the thermal field via the temperature dependence of mantle rheology. Using thermal modeling, we show that the nonlinear feedback between the thermal and flow fields always leads to complete stagnation of the mantle wedge over a shallow, weakened part of the slab-mantle interface and an abrupt onset of mantle flow further down-dip. The abrupt increase in flow velocity leads to a sharp thermal transition from a cold stagnant to a hot flowing part of the wedge. This sharp thermal transition is inherent to all subduction zones, explaining a commonly observed sharp arc-ward increase in seismic attenuation.

    Original languageEnglish
    Article numberL13308
    JournalGeophysical Research Letters
    Volume38
    Issue number13
    DOIs
    Publication statusPublished - 2011 Jul 1

    ASJC Scopus subject areas

    • Geophysics
    • Earth and Planetary Sciences(all)

    Fingerprint

    Dive into the research topics of 'Sharp thermal transition in the forearc mantle wedge as a consequence of nonlinear mantle wedge flow'. Together they form a unique fingerprint.

    Cite this