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dc.contributor.authorKarlstrom, L.
Lee, C.-T. A.
Manga, M.
dc.date.accessioned 2016-01-28T18:32:41Z
dc.date.available 2016-01-28T18:32:41Z
dc.date.issued 2014
dc.identifier.citation Karlstrom, L., Lee, C.-T. A. and Manga, M.. "The role of magmatically driven lithospheric thickening on arc front migration." Geochemistry, Geophysics, Geosystems, 15, no. 6 (2014) American Geophysical Union: 2655-2675. http://dx.doi.org/10.1002/2014GC005355.
dc.identifier.urihttps://hdl.handle.net/1911/88232
dc.description.abstract Volcanic 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.
dc.language.iso eng
dc.publisher American Geophysical Union
dc.rights Article 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.
dc.title The role of magmatically driven lithospheric thickening on arc front migration
dc.type Journal article
dc.citation.journalTitle Geochemistry, Geophysics, Geosystems
dc.subject.keywordarc front migration
crustal thickening
dc.citation.volumeNumber 15
dc.citation.issueNumber 6
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1002/2014GC005355
dc.type.publication publisher version
dc.citation.firstpage 2655
dc.citation.lastpage 2675


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