The role of magmatically driven lithospheric thickening on arc front migration

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dc.citation.firstpage2655en_US
dc.citation.issueNumber6en_US
dc.citation.journalTitleGeochemistry, Geophysics, Geosystemsen_US
dc.citation.lastpage2675en_US
dc.citation.volumeNumber15en_US
dc.contributor.authorKarlstrom, L.en_US
dc.contributor.authorLee, C.-T. A.en_US
dc.contributor.authorManga, M.en_US
dc.date.accessioned2016-01-28T18:32:41Zen_US
dc.date.available2016-01-28T18:32:41Zen_US
dc.date.issued2014en_US
dc.description.abstractVolcanic activity at convergent plate margins is localized along lineaments of active volcanoes that focus rising magma generated within the mantle below. In many arcs worldwide, particularly continental arcs, the volcanic front migrates away from the interface of subduction (the trench) over millions of years, reflecting coevolving surface forcing, tectonics, crustal magma transport, and mantle flow. Here we show that extraction of melt from arc mantle and subsequent magmatic thickening of overlying crust and lithosphere can drive volcanic front migration. These processes are consistent with geochemical trends, such as increasing La/Yb, which show that increasing depths of differentiation correlate with arc front migration in continental arcs. Such thickening truncates the underlying mantle flow field, squeezing hot mantle wedge and the melting focus away from the trench while progressively decreasing the volume of melt generated. However, if magmatic thickening is balanced by tectonic extension in the upper plate, a steady crustal thickness is achieved that results in a more stationary arc front with long-lived mantle melting. This appears to be the case for some island arcs. Thus, in combination with tectonic modulation of crustal thickness, magmatic thickening provides a self consistent model for volcanic arc front migration and the composition of arc magmas.en_US
dc.identifier.citationKarlstrom, L., Lee, C.-T. A. and Manga, M.. "The role of magmatically driven lithospheric thickening on arc front migration." <i>Geochemistry, Geophysics, Geosystems,</i> 15, no. 6 (2014) American Geophysical Union: 2655-2675. http://dx.doi.org/10.1002/2014GC005355.en_US
dc.identifier.doihttp://dx.doi.org/10.1002/2014GC005355en_US
dc.identifier.urihttps://hdl.handle.net/1911/88232en_US
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.subject.keywordarc front migrationen_US
dc.subject.keywordcrustal thickeningen_US
dc.titleThe role of magmatically driven lithospheric thickening on arc front migrationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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