Zircon saturation re-revisited
Zircon saturation re-revisited
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DOI：
10.1016/j.chemgeo.2013.05.028
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发表时间：
2013-08-02
期刊：
影响因子：
3.9
通讯作者：
Schmitt, Axel K.
中科院分区：
文献类型：
--
作者：
Boehnke, Patrick;Watson, E. Bruce;Schmitt, Axel K.
实验，分析和计算方法的改进，以及发表的研究，产生看似矛盾的结果，促使我们回到确定锆石稳定性的范围内长英质到中间熔体预期在大陆环境。我们（重新）分析了沃森和哈里森（1983）锆石结晶研究的运行产品和一种新型的锆石溶解实验（高达25 kbar），使用大半径离子微探针来约束细化的锆石溶解度模型。新的数据产生广泛类似的模式，如前排列的温度和确认参数M [=（Na + K + 2Ca）/（Al中心点Si）]是一个适当的组成代理的化学相互作用，通过锆石溶解。我们使用贝叶斯方法来优化锆石溶液模型中的系数的计算，该模型由下式给出：In D-Zr =（10 108 +/- 32）/T（K）-（1.16 +/- 0.15）（M-1）-（1.48 +/- 0.09）其中D-Zr是Zr在锆石和熔体之间的分配系数，并且误差在1 σ。敏感性测试表明，温度和成分是两个主要的控制锆石溶解度在地壳熔体中没有可观察到的影响，由于压力（高达25千巴）或可变的水含量。与自然界的实例比较，证实了该模型在约100 ℃时的有效性。700摄氏度。(c)2013爱思唯尔有限公司版权所有。
Improvements in experimental, analytical and computational methodologies together with published studies yielding seemingly contradictory results prompted us to return to the determination of zircon stability in the range of felsic to intermediate melts expected in continental environments. We (re-)analyzed both the run products from the zircon crystallization study of Watson and Harrison (1983) and a new style of zircon dissolution experiments (up to 25 kbar) using a large radius ion microprobe to constrain a refined zircon solubility model. The new data yield broadly similar patterns as before when arrayed for temperature and confirm that the parameter M [=(Na + K + 2Ca)/(Al center dot Si)] is an appropriate compositional proxy for the chemical interactions through which zircon is dissolved. We used a Bayesian approach to optimize the calculation of the coefficients in the zircon solution model, which is given by:In D-Zr = (10108 +/- 32)/T(K)-(1.16 +/- 0.15)(M-1)-(1.48 +/- 0.09)where D-Zr is the distribution coefficient of Zr between zircon and melt and the errors are at one sigma. Sensitivity tests indicate that temperature and composition are the two dominant controls on zircon solubility in crustal melts with no observable effects due to pressure (up to 25 kbar) or variable water content. Comparison of the down-temperature extrapolation with natural examples confirms the validity of the model at ca. 700 degrees C. (c) 2013 Elsevier B.V. All rights reserved.