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      Rapid reequilibration of H2O and oxygen fugacity in olivine-hosted melt inclusions

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      Journal: Geology
      Publisher: Geological Society of America

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          The compressibility of silicate liquids containing Fe2O3 and the effect of composition, temperature, oxygen fugacity and pressure on their redox states

          Ian Carmichael, Victor C. Kress (1991)
          Article 0 comments Cited 225 times – based on 0 reviews     Review now
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            Vapour undersaturation in primitive mid-ocean-ridge basalt and the volatile content of Earth's upper mantle.

            Alberto E Saal, Erik Hauri, Charles H Langmuir … (2002)
            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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              The importance of water to oceanic mantle melting regimes.

              P D Asimow, C H Langmuir (2003)
              The formation of basaltic crust at mid-ocean ridges and ocean islands provides a window into the compositional and thermal state of the Earth's upper mantle. But the interpretation of geochemical and crustal-thickness data in terms of magma source parameters depends on our understanding of the melting, melt-extraction and differentiation processes that intervene between the magma source and the crust. Much of the quantitative theory developed to model these processes has neglected the role of water in the mantle and in magma, despite the observed presence of water in ocean-floor basalts. Here we extend two quantitative models of ridge melting, mixing and fractionation to show that the addition of water can cause an increase in total melt production and crustal thickness while causing a decrease in mean extent of melting. This may help to resolve several enigmatic observations in the major- and trace-element chemistry of both normal and hotspot-affected ridge basalts.
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                Author and article information

                Journal
                Title: Geology
                Abbreviated Title: Geology
                Publisher: Geological Society of America
                ISSN (Print): 0091-7613
                ISSN (Electronic): 1943-2682
                Publication date Created: September 13 2012
                Publication date (Print): August 09 2012
                Volume: 40
                Issue: 10
                Pages: 915-918
                Article
                DOI: 10.1130/G32992.1
                SO-VID: 164e8ca1-e409-4b31-bf99-b479194bfa83
                Copyright © © 2012
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