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首页> 外文期刊>Anais da Academia Brasileira de Ciências >An experimental study of the partitioning of trace elements between rutile and silicate melt as a function of oxygen fugacity
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An experimental study of the partitioning of trace elements between rutile and silicate melt as a function of oxygen fugacity

机译：金红石和硅酸盐熔体中微量元素分配随氧逸度变化的实验研究

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摘要

Subduction zone or arc magmas are known to display a characteristic depletion of High Field Strength Elements (HFSE) relative to other similarly incompatible elements, which can be attributed to the presence of the accessory mineral rutile (TiO2) in the residual slab. Here we show that the partitioning behavior of vanadium between rutile and silicate melt varies from incompatible (similar to 0.1) to compatible (similar to 18) as a function of oxygen fugacity. We also confirm that the HFSE are compatible in rutile, with D(Ta) > D(Nb) (D(Hf) >/similar to D(Zr), but that the level of compatibility is strongly dependent on melt composition, with partition coefficients increasing about one order of magnitude with increasing melt polymerization (or decreasing basicity). Our partitioning results also indicate that residual rutile may fractionate U from Th due to the contrasting (over 2 orders of magnitude) partitioning between these two elements. We confirm that, in addition to the HFSE, Cr, Cu, Zn and W are compatible in rutile at all oxygen fugacity conditions.
机译：相对于其他类似的不相容元素，俯冲带或弧岩浆显示出高场强元素（HFSE）的特征性损耗，这可能归因于残余平板中存在辅助金红石（TiO2）。在这里，我们表明，钒在金红石和硅酸盐熔体之间的分配行为随氧逸度的变化而变化，从不相容（约0.1）到相容（约18）。我们还确认HFSE在金红石中是相容的，其D（Ta）> D（Nb）（D（Hf）> /与D（Zr）相似，但相容性水平强烈取决于熔体组成，分配系数随着熔体聚合的增加（或碱度降低）而增加约一个数量级，我们的分配结果还表明，由于这两个元素之间的分配对比（超过2个数量级），残余的金红石可能将U从Th中分离出来。确认除HFSE外，Cr，Cu，Zn和W在所有氧逸度条件下在金红石中均相容。

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