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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Experimental calibration of the effect of H2O on plagioclase crystallization in basaltic melt at 200 MPa</title>
<creator>Almeev, Renat R.</creator>
<creator>Holtz, Francois</creator>
<creator>Koepke, Juergen</creator>
<creator>Parat, Fleurice</creator>
<contributor>Institut für Mineralogie, Leibniz Universität Hannover ; Université du Québec</contributor>
<contributor>Dynamique de la Lithosphere ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0003-004X</source>
<source>American Mineralogist</source>
<publisher>Mineralogical Society of America</publisher>
<identifier>hal-00757600</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00757600</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00757600</source>
<source>American Mineralogist, Mineralogical Society of America, 2012, 97 (7), pp.1234-1240. 〈10.2138/am.2012.4100〉</source>
<identifier>DOI : 10.2138/am.2012.4100</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.2138/am.2012.4100</relation>
<language>en</language>
<subject lang=fr>Crystallization</subject>
<subject lang=fr>H2O</subject>
<subject lang=fr>MORB</subject>
<subject lang=fr>plagioclase liquidus</subject>
<subject lang=fr>FTIR</subject>
<subject lang=fr>KFT</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Crystallization experiments were conducted at 200 MPa to determine the effect of small amounts of H2O on the liquidus temperature of basaltic melts in which plagioclase is the liquidus phase. The H2O concentrations in the quenched glasses, determined by infrared spectroscopy and Karl-Fischer titration, ranged from 0.02 to 4.2 wt% H2O. The dry liquidus temperature at 200 MPa was estimated from experiments at 1 atm (H2O-free) and from the known pressure dependence of plagioclase crystallization temperature. The effect of water (expressed as wt% H2O) on the plagioclase liquidus temperature is nonlinear and diminishing with increasing melt H2O concentrations. According to our new experimental data, it can be empirically predicted with following equation: Formula where CH2O is the water concentration in the melt (wt%), TDRY, and TWET are plagioclase crystallization temperatures in water-free and water-bearing systems, respectively. The relationship between CH2O and liquidus temperature worked out in this study is valid for a range of basaltic compositions, ranging from high-alumina basalts to basaltic andesites. The combination of the empirical equation predicting the liquidus depression of plagioclase with previous models predicting the olivine liquidus curve is useful to determine the liquidus temperature in various H2O-bearing basaltic systems in which either plagioclase or olivine is the liquidus phase.</description>
<date>2012-07</date>
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