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首页> 外文期刊>Contributions to Mineralogy and Petrology >The effect of H2O on the olivine liquidus of basaltic melts: experiments and thermodynamic models
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The effect of H2O on the olivine liquidus of basaltic melts: experiments and thermodynamic models

机译：H 2 O对玄武质熔体橄榄石液相线的影响：实验和热力学模型

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We designed and carried out experiments to investigate the effect of H2O on the liquidus temperature of olivine-saturated primitive melts. The effect of H2O was isolated from other influences by experimentally determining the liquidus temperatures of the same melt composition with various amounts of H2O added. Experimental data indicate that the effect of H2O does not depend on pressure or melt composition in the basaltic compositional range. The influence of H2O on melting point lowering can be described as a polynomial function ( CmeltH2 O textin textwt% ):Updelta T ( °C ) = 40.4 ( CmeltH2 O ) - 2.97 ( CmeltH2 O )2 + 0.0761 ( CmeltH2 O )3 . {left( {rm C^{{rm melt}}_{{rm{H_{2} O}}} ;{text{in}};{text{wt}}% } right)}:Updelta {T};{left( {^{ circ }rm C} right)} = 40.4 {left( {rm C^{{rm melt}}_{{rm {H_{2} O}}} } right)} - 2.97 {left( {rm C^{{rm melt}}_{{rm {H_{2} O}}} } right)}^{2} + 0.0761 {left( {rm C^{{rm melt}}_{{rm{H_{2} O}}} } right)}^{3} . This expression can be used to account for the effect of H2O on olivine-melt thermometers, and can be incorporated into fractionation models for primitive basalts. The non-linear effect of H2O indicates that incorporation of H2O in silicate melts is non-ideal, and involves interaction between H2O and other melt components. The simple speciation approach that seems to account for the influence of H2O in simple systems (albite-H2O, diopside-H2O) fails to describe the mixing behavior of H2O in multi-component silicate melts. However, a non-ideal solution model that treats the effect of H2O addition as a positive excess free energy can be fitted to describe the effect of melting point lowering.
机译：我们设计并进行了实验，以研究H 2 O对橄榄石饱和原始熔体的液相线温度的影响。通过实验确定添加了不同量的H 2 O的相同熔体成分的液相线温度，将H 2 O的影响与其他影响分开。实验数据表明，H 2 O的作用与玄武岩成分范围内的压力或熔体成分无关。 H 2 O对降低熔点的影响可以描述为多项式函数（C melt H 2 O textin textwt％）：Updelta T（° C）= 40.4（C melt H 2 O ）- 2.97（C 融化 H 2 O ） 2 + 0.0761（C 融化 < sub> H 2 O ） 3 。 {left（{rm C ^ {{rm熔体}} _ {{rm {H_ {2} O}}}; {text {in}}; {text {wt}}％}}}：Updelta {T} ; {left（{{{circ} rm C} right）} = 40.4 {left（{rm C ^ {{rm熔体}} _ {{rm {H_ {2} O}}}}}}}-2.97 {左（{rm C ^ {{rm熔体}} _ {{rm {H_ {2} O}}}}右）} ^ {2} + 0.0761 {左（{rm C ^ {{rm熔体}} _ { {rm {H_ {2} O}}}}右）} ^ {3}。该表达式可用于解释H 2 O对橄榄石熔融温度计的影响，并可将其合并到原始玄武岩的分馏模型中。 H 2 O的非线性效应表明，H 2 O在硅酸盐熔体中的掺入是不理想的，并且涉及H 2 之间的相互作用> O和其他熔体成分。似乎解释了H 2 O在简单系统（albite-H 2 O，透辉石-H 2 O）无法描述H 2 O在多组分硅酸盐熔体中的混合行为。但是，可以将将H 2 O的影响视为正的过量自由能的非理想溶液模型进行拟合，以描述降低熔点的影响。

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