Zircon solubility in silicate melts: New empirical models and thermodynamics

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-02-13 DOI:10.1016/j.chemgeo.2025.122682

Alexander Borisov , Leonid Aranovich , Paula Antoshechkina

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引用次数: 0

Abstract

Published experimental data on zircon (Zrn) solubility in silicate melts are critically evaluated to conclude that H₂O dissolved in the melts has no to minor effect on the Zrn solubility. The effect of pressure is small but resolvable. A new empirical equation describing zircon solubility in silicate melts as a function of temperature, pressure and melt composition, is derived based on the published experimental data. The new equation predicts log Zr (ppm) in the melts with a standard error of 0.087, which is equivalent to ca. 22 % error in the range from 178 to 61,370 ppm Zr, 750-1500 °C, and 0.001–25 kbar covered by the experiments. A new equation describing the relatively low-temperature range 750-1200 °C, more appropriate for application to natural magmatic rocks, is also suggested.

The new equation for temperature dependence of the standard Gibbs free energy of zircon melting reaction is derived for the first time. The equation is consistent with the high temperature phase diagram of the ZrO₂-SiO₂ system and predicts metastable zircon fusion temperature at T_fus = 2232 K. This equation is silicate melt model independent. Thermodynamic mixing properties of the zircon species in silicate melts consistent with the MELTS thermodynamic model retrieved by fitting 186 experimental data points, agree qualitatively with the empirical formulation and simple equations suggested by Bruce Watson and co-workers.

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锆石在硅酸盐熔体中的溶解度：新的经验模型和热力学

对已发表的锆石（Zrn）在硅酸盐熔体中溶解度的实验数据进行了批判性评价，得出熔体中H2O的溶解对Zrn的溶解度没有或很小的影响。压力的影响很小，但可以解决。基于已发表的实验数据，导出了锆石在硅酸盐熔体中溶解度随温度、压力和熔体成分变化的经验方程。新方程预测熔体中对数Zr （ppm）的标准误差为0.087，相当于在实验覆盖的178 ~ 61,370 ppm Zr, 750 ~ 1500℃，0.001 ~ 25 kbar范围内误差约22%。本文还提出了一个描述相对较低温度范围（750 ~ 1200℃）的新方程，该方程更适合应用于天然岩浆岩。首次导出了锆石熔融反应标准吉布斯自由能的温度依赖方程。该方程与ZrO2-SiO2体系的高温相图一致，预测了Tfus = 2232 K时的亚稳锆石熔合温度。该方程与硅酸盐熔体模型无关。通过拟合186个实验数据点得到的熔融体热力学模型与硅酸盐熔体中锆石的混合热力学性质一致，与Bruce Watson等人提出的经验公式和简单方程定性一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.