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Large-ion lithophile elements delivered by saline fluids to the sub-arc mantle

Earth, planets, and space, 2014-06, Vol.66 (1), p.1-11, Article 61 [Peer Reviewed Journal]

Kawamoto et al.; licensee Springer. 2014. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. ;The Author(s) 2014 ;Attribution ;ISSN: 1880-5981 ;ISSN: 1343-8832 ;EISSN: 1880-5981 ;DOI: 10.1186/1880-5981-66-61

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  • Title:
    Large-ion lithophile elements delivered by saline fluids to the sub-arc mantle
  • Author: Kawamoto, Tatsuhiko ; Mibe, Kenji ; Bureau, Hélène ; Reguer, Solenn ; Mocuta, Cristian ; Kubsky, Stefan ; Thiaudière, Dominique ; Ono, Shigeaki ; Kogiso, Tetsu
  • Subjects: 5. Volcanology ; Basalt ; Beams (radiation) ; Earth and Environmental Science ; Earth Sciences ; Enrichment ; Environmental Sciences ; Fluids ; Geofluid processes in subduction zones and mantle dynamics ; Geology ; Geophysics/Geodesy ; Mantle ; Melts ; Partitioning ; Saline
  • Is Part Of: Earth, planets, and space, 2014-06, Vol.66 (1), p.1-11, Article 61
  • Description: Geochemical signatures of arc basalts can be explained by addition of aqueous fluids, melts, and/or supercritical fluids from the subducting slab to the sub-arc mantle. Partitioning of large-ion lithophile elements between aqueous fluids and melts is crucial as these two liquid phases are present in the sub-arc pressure-temperature conditions. Using a micro-focused synchrotron X-ray beam, in situ X-ray fluorescence (XRF) spectra were obtained from aqueous fluids and haplogranite or jadeite melts at 0.3 to 1.3 GPa and 730°C to 830°C under varied concentrations of (Na, K)Cl (0 to 25 wt.%). Partition coefficients between the aqueous fluids and melts were calculated for Pb, Rb, and Sr ( D Pb , Rb , Sr fluid / melt ). There was a positive correlation between D Pb , Rb , Sr fluid / melt values and pressure, as well as D Pb , Rb , Sr fluid / melt values and salinity. As compared to the saline fluids with 25 wt.% (Na, K)Cl, the Cl-free aqueous fluids can only dissolve one tenth (Pb, Rb) to one fifth (Sr) of the amount of large-ion lithophile elements when they coexist with the melts. In the systems with 13 to 25 wt.% (Na, K)Cl, D Pb , Rb fluid / melt values were greater than unity, which is indicative of the capacity of such highly saline fluids to effectively transfer Pb and Rb. Enrichment of large-ion lithophile elements such as Pb and Rb in arc basalts relative to mid-oceanic ridge basalts (MORB) has been attributed to mantle source fertilization by aqueous fluids from dehydrating oceanic plates. Such aqueous fluids are likely to contain Cl, although the amount remains to be quantified.
  • Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
  • Language: English
  • Identifier: ISSN: 1880-5981
    ISSN: 1343-8832
    EISSN: 1880-5981
    DOI: 10.1186/1880-5981-66-61
  • Source: Hyper Article en Ligne (HAL) (Open Access)
    Alma/SFX Local Collection
    Springer Nature OA/Free Journals
    ProQuest Central
    Freely Accessible Japanese Titles
    DOAJ Directory of Open Access Journals
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