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      Halogens in volcanic systems

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      Chemical Geology
      Elsevier BV

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          Volatiles in subduction zone magmas: concentrations and fluxes based on melt inclusion and volcanic gas data

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            VolatileCalc: a silicate melt–H2O–CO2 solution model written in Visual Basic for excel

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              Vapour undersaturation in primitive mid-ocean-ridge basalt and the volatile content of Earth's upper mantle.

              The analysis of volatiles in magmatic systems can be used to constrain the volatile content of the Earth's mantle and the influence that magmatic degassing has on the chemistry of the oceans and the atmosphere. But most volatile elements have very low solubilities in magmas at atmospheric pressure, and therefore virtually all erupted lavas are degassed and do not retain their primary volatile signatures. Here we report the undersaturated pre-eruptive volatile content for a suite of mid-ocean-ridge basalts from the Siqueiros intra-transform spreading centre. The undersaturation leads to correlations between volatiles and refractory trace elements that provide new constraints on volatile abundances and their behaviour in the upper mantle. Our data generate improved limits on the abundances of carbon dioxide, water, fluorine, sulphur and chlorine in the source of normal mid-ocean-ridge basalt. The incompatible behaviour of carbon dioxide, together with the CO(2)/Nb and CO(2)/Cl ratios, permit estimates of primitive carbon dioxide and chlorine to be made for degassed and chlorine-contaminated mid-ocean-ridge basalt magmas, and hence constrain degassing and contamination histories of mid-ocean ridges.
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                Author and article information

                Journal
                Chemical Geology
                Chemical Geology
                Elsevier BV
                00092541
                June 2009
                June 2009
                : 263
                : 1-4
                : 1-18
                Article
                10.1016/j.chemgeo.2008.10.005
                9f908942-c214-4e00-8d3e-53bbb6601250
                © 2009

                http://www.elsevier.com/tdm/userlicense/1.0/

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