The importance of defining chemical potentials, substitution mechanisms and solubility in trace element diffusion studies: the case of Zr and Hf in olivine

Michael C. Jollands; Hugh St. C. ONeill; Jorg Hermann

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The importance of defining chemical potentials, substitution mechanisms and solubility in trace element diffusion studies: the case of Zr and Hf in olivine

机译：微量元素扩散研究中定义化学势，取代机制和溶解度的重要性：橄榄石中Zr和Hf的情况

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The diffusion, substitution mechanism and solubility limits of Zr and Hf in synthetic forsterite (Mg_2SiO_4) and San Carlos olivine (Mg_(0.9)Fe_(0.1))_2SiO_4 have been investigated between 1,200 and 1,500 °C as a function of the chemical potentials of the components in the system MgO(FeO)-SiO_2-ZrO_2(HfO_2). The effect of oxygen fugacity and crystallographic orientation were also investigated. The solubilities of Zr in forsterite are highest and diffusion fastest when the coexisting three-phase source assemblage includes ZrSiO_4 (zircon) or HfSiO_4 (hafnon), and lower and slower, respectively, when the source assemblage includes MgO (periclase). This indicates that Zr and Hf substitute on the octahedral sites in olivine, charge balanced by magnesium vacancies. Diffusion is anisotropic, with rates along the crystal axes increasing in the order a 展开▼

机译：Zr和Hf在合成镁橄榄石（Mg_2SiO_4）和San Carlos橄榄石（Mg_（0.9）Fe_（0.1））_ 2SiO_4中的扩散，取代机理和溶解度极限已在1,200至1,500°C之间随化学势的变化进行了研究。 MgO（FeO）-SiO_2-ZrO_2（HfO_2）中的组分。还研究了氧逸度和晶体学取向的影响。当三相源组合包括ZrSiO_4（锆石）或HfSiO_4（哈夫农）时，Zr在镁橄榄石中的溶解度最高，扩散最快，而当源组合包括MgO（过磷酸钙酶）时，Zr的溶解度分别较低和较慢。这表明Zr和Hf替代橄榄石的八面体位，其电荷由镁空位平衡。扩散是各向异性的，沿晶轴的速率按a 展开▼

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《Contributions to Mineralogy and Petrology》 |2014年第3期|共19页

作者
Michael C. Jollands; Hugh St. C. ONeill; Jorg Hermann;
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正文语种 eng

中图分类矿物学;岩石学;

关键词
Diffusion; Experimental petrology; Forsterite; Zirconium; Partitioning; Laser ablation ICP-MS;

机译：扩散;实验岩石学;镁橄榄石;锆;分配;激光烧蚀ICP-MS;

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1. The importance of defining chemical potentials, substitution mechanisms and solubility in trace element diffusion studies: the case of Zr and Hf in olivine [J] . Michael C. Jollands, Hugh St. C. ONeill, Jorg Hermann Contributions to Mineralogy and Petrology . 2014,第3期

机译：微量元素扩散研究中定义化学势，取代机制和溶解度的重要性：橄榄石中Zr和Hf的情况

2. Diffusion and partition coefficients of minor and trace elements in San Carlos olivine at 1,300°C with some geochemical implications [J] . Carl Spandler, Hugh St.C. O’Neill Contributions to Mineralogy and Petrology . 2010,第6期

机译：1300°C圣卡洛斯橄榄石中微量元素和微量元素的扩散和分配系数，对一些地球化学有影响

3. Frozen melt-rock reaction in a peridotite xenolith from sub-arc mantle recorded by diffusion of trace elements and water in olivine [J] . Tollan P. M. E., ONeill H. St. C., Hermann J., Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System . 2015,第Null期

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机译：芳香族和取代芳烃燃料产生烟灰的化学和物理机制的扩散火焰研究：1984年2月16日至1988年2月15日期间的最终报告

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The importance of defining chemical potentials, substitution mechanisms and solubility in trace element diffusion studies: the case of Zr and Hf in olivine

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