Flux of carbonate melt from deeply subducted pelitic sediments: Geophysical and geochemical implications for the source of Central American volcanic arc

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dc.citation.firstpageL16307en_US
dc.citation.journalTitleGeophysical Research Lettersen_US
dc.citation.volumeNumber39en_US
dc.contributor.authorTsuno, Kyuseien_US
dc.contributor.authorDasgupta, Rajdeepen_US
dc.contributor.authorDanielson, Lisaen_US
dc.contributor.authorRighter, Kevinen_US
dc.date.accessioned2013-01-30T16:37:21Zen_US
dc.date.available2013-07-31T05:10:06Zen_US
dc.date.issued2012en_US
dc.description.abstract[1] We determined the fluid-present and fluid-absent near-solidus melting of an Al-poor carbonated pelite at 3–7 GPa, to constrain the possible influence of sediment melt in subduction zones. Hydrous silicate melt is produced at the solidi at 3–4 GPa whereas Na-K-rich carbonatite is produced at the solidi at ≥5 GPa for both starting compositions. At ≥5 GPa and 1050°C, immiscible carbonate and silicate melts appear with carbonate melt forming isolated pockets embedded in silicate melt. Application of our data to Nicaraguan slab suggests that sediment melting may not occur at sub-arc depth (∼170 km) but carbonatite production can occur atop slab or by diapiric rise of carbonated-silicate mélange zone to the mantle wedge at ∼200–250 km depth. Flux of carbonatite to shallower arc-source can explain the geochemistry of Nicaraguan primary magma (low SiO2and high CaO, Ba/La). Comparison of carbonate-silicate melt immiscibility field with mantle wedge thermal structure suggests that carbonatite might temporally be trapped in viscous silicate melt, and contribute to seismic low-velocity zone at deep mantle wedge of Nicaragua.en_US
dc.embargo.terms6 monthsen_US
dc.identifier.citationTsuno, Kyusei, Dasgupta, Rajdeep, Danielson, Lisa, et al.. "Flux of carbonate melt from deeply subducted pelitic sediments: Geophysical and geochemical implications for the source of Central American volcanic arc." <i>Geophysical Research Letters,</i> 39, (2012) American Geophysical Union: L16307. http://dx.doi.org/10.1029/2012GL052606.en_US
dc.identifier.doihttp://dx.doi.org/10.1029/2012GL052606en_US
dc.identifier.urihttps://hdl.handle.net/1911/69885en_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 magmatismen_US
dc.subject.keywordcarbonatitic melten_US
dc.subject.keywordmantle wedgeen_US
dc.subject.keywordsedimentsen_US
dc.subject.keywordsubduction zonesen_US
dc.titleFlux of carbonate melt from deeply subducted pelitic sediments: Geophysical and geochemical implications for the source of Central American volcanic arcen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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