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首页> 外文期刊>Contributions to Mineralogy and Petrology >The compressibility of CaCO3-Li2CO3-Na2CO3-K2CO3 liquids: application to natrocarbonatite and CO2-bearing nephelinite liquids from Oldoinyo Lengai
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The compressibility of CaCO3-Li2CO3-Na2CO3-K2CO3 liquids: application to natrocarbonatite and CO2-bearing nephelinite liquids from Oldoinyo Lengai

机译：CaCO3-Li2CO3-Na2CO3-K2CO3液体的可压缩性：在来自Oldoinyo Lengai的碳酸钠和含CO2的霞石液体中的应用

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To constrain the compressibility of natrocarbonate liquids, sound-speed measurements were made on 11 liquids in the CaCO3-Li2CO3-Na2CO3-K2CO3 quaternary system from 808 to 1323 K at 1 bar with a frequency-sweep acoustic interferometer. CaCO3 concentrations range from 15 to 50 mol% in four of the experimental liquids. The sound-speed data for all liquids were converted to isothermal compressibility (beta(T)), which were fit to an ideal mixing model with respect to composition; the average residual is 1.2 %. Fitted values (+/- 1 sigma) of the partial molar compressibility (10(-2) GPa(-1)) at 1100 K were derived for CaCO3 (5.36 +/- 0.13), Li2CO3 (8.09 +/- 0.06), Na2CO3 (10.62 +/- 0.07), and K2CO3 (14.09 +/- 0.06); these values translate to bulk modulus values of 18.7, 12.4, 9.4, and 7.1 GPa, respectively, reflecting the relatively large compressibility of carbonate liquids. The data are additionally used to estimate the partial molar volume and compressibility of the CO2 component dissolved as carbonate in nephelinite liquids; the density of this dissolved component at 1423 K and 1 GPa ranges from 1.62, 1.71 to 1.83 g/cm(3) when it is complexed with K+, Na+, and Ca2+ respectively, and is estimated to be +/- 2.05 and 2.14 g/cm(3) when complexed with Fe2+ and Mg2+, respectively. The results from this study can be applied to natrocarbonate liquids, such as those erupted from Oldoinyo Lengai volcano in Africa, and indicate a melt density of +/- 2.19 g/cm(3) at 1150 degrees C and 1 GPa, which is +/- 18 % less dense than the average melt density (similar to 2.67 g/cm(3)) calculated for associated Mg-poor nephelinite liquids at the same conditions and volatile-free. However, the dissolution of 10.1 wt% H2O and 8.7 wt% CO2 in the average nephelinite melt (based on volatile contents reported in the literature for these magmas) reduces its density to similar to 2.14 g/cm(3) at 1150 degrees C and 1 GPa, eliminating the buoyancy contrast with the natrocarbonate melt. In turn, it is highly likely that the natrocarbonatite melts contained significant amounts of dissolved H2O and, as an example, the addition of 10 wt% H2O lowers the melt density by similar to 14 % to similar to 1 .88 g/cm(3), and therefore re-establishes a large density contrast with the volatile-rich nephelinite melts.
机译：为了限制碳酸钠液体的可压缩性，使用频率扫描声学干涉仪在1 bar的压力下从808到1323 K在CaCO3-Li2CO3-Na2CO3-K2CO3四元体系中对11种液体进行了声速测量。在四种实验液体中，CaCO3浓度范围为15至50 mol％。将所有液体的声速数据转换为等温压缩率（beta（T）），就组成而言，该等温线适合理想的混合模型;平均残留为1.2％。得出CaCO3（5.36 +/- 0.13），Li2CO3（8.09 +/- 0.06）在1100 K时的部分摩尔压缩率（10（-2）GPa（-1））的拟合值（+/- 1 sigma）， Na2CO3（10.62 +/- 0.07）和K2CO3（14.09 +/- 0.06）;这些值分别转化为18.7、12.4、9.4和7.1 GPa的体积模量值，反映出碳酸盐液体的相对较大的可压缩性。该数据还用于估算以软水合物形式溶解为碳酸盐的CO2组分的部分摩尔体积和可压缩性。当它分别与K +，Na +和Ca2 +络合时，在1423 K和1 GPa时该溶解成分的密度范围为1.62、1.71至1.83 g / cm（3），估计为+/- 2.05和2.14 g / cm（3）分别与Fe2 +和Mg2 +复合时。这项研究的结果可以应用于碳酸钠液体，例如非洲的Oldoinyo Lengai火山喷出的液体，表明在1150摄氏度和1 GPa下的熔体密度为+/- 2.19 g / cm（3），为+密度比在相同条件下且不含挥发物的贫镁轻晶石液体计算的平均熔体密度（约2.67 g / cm（3））低18％。但是，平均霞石熔体中溶解有10.1 wt％的H2O和8.7 wt％的CO2（基于文献报道的这些岩浆的挥发物含量），其密度在1150摄氏度下接近2.14 g / cm（3），并且1 GPa，消除了与碳酸钠熔体的浮力对比。反过来，萘碳酸盐熔体很可能含有大量溶解的H2O，例如，添加10 wt％H2O会使熔体密度降低14％左右，接近1.88 g / cm（3 ），因此与富含挥发物的霞石熔体重新建立了大的密度对比。

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