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首页> 外文期刊>Chemical geology >The effect of fO(2) on the diffusion of redox-sensitive elements in haplobasaltic melt at 1 GPa and 1300 degrees C
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The effect of fO(2) on the diffusion of redox-sensitive elements in haplobasaltic melt at 1 GPa and 1300 degrees C

机译：FO（2）对1GPa和1300摄氏度氧化钠熔体中氧化还原敏感元素扩散的影响

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摘要

Diffusivities for elements (P, Sc, V, Mn, Co, Zn, Cr, Nb, Mo, La, Ce, Pr, Sm, Eu, Gd, Ta, W) at 1300 degrees C and 1 GPa in basaltic melts were characterized across a range of oxygen fugacity (fO(2)) conditions. Experiments were carried out using either a reducing (FMQ-3.1), intermediate (similar to FMQ-1.2) or oxidizing (FMQ+6) fO(2). For each fO(2), three experiments were conducted for durations of 20, 40, and 80 min. For a given time series, changes in diffusivity are typically within 3 standard error at a single fO(2). The magnitudes of the elemental diffusivities can be grouped into those of the High-field Strength Elements (HFSE), the Rare Earth Elements (REE), the transition elements, and P. Vanadium and Sc have diffusivities more similar to the REEs and HFSEs respectively, than the other transition elements. The best fits of diffusivities for P also suggest that the diffusivity of this element is more in line with those of the HFSEs. At oxidizing conditions, a fractionation of Nb from Ta with greater magnitude than that at the other oxygen fugacities is seen. Across oxygen fugacities explored here, Eu exhibits unique changes in diffusion. At more reducing conditions, the diffusivity of Eu increases relative to the neighboring REE elements Sm and Gd, with this effect most pronounced at FMQ-3.1 and present in experiments conducted at intermediate fO(2) conditions. This demonstrates that an Eu anomaly can be generated by diffusion alone. In oxidizing conditions, because Eu likely is present as mostly Eu3+, the signal vanishes as Eu diffusivity becomes similar to that of other trivalent REEs. There are small systematic changes in element diffusivities for both redox-sensitive and non-redox sensitive elements as fO(2) is varied. Averages of the 20, 40, and 80 min diffusivities for all elements done in the intermediate fO(2) experiments have the slowest diffusivities of the three oxygen fugacities explored. On average, the diffusivities of the entire contingent of
机译：特征在于1300℃和1GPa的元素（P，SC，V，Mn，Co，Zn，Cr，Nb，Mo，La，Ce，Pr，Sm，Eu，Gd，Ta，W）的扩散性跨越一系列氧气不足（FO（2））条件。使用还原（FMQ-3.1），中间体（类似于FMQ-1.2）或氧化（FMQ + 6）FO（2）进行实验。对于每种FO（2），对20,40和80分钟的持续时间进行三个实验。对于给定的时间序列，扩散性的变化通常在单个FO（2）处的3个标准误差范围内。元素扩散率的大小可以分为高场强元件（HFSE），稀土元素（REE），过渡元件和P.钒和SC分别具有更多与REES和HFSES的扩散性，而不是其他过渡元素。 P的最佳扩散性也表明该元素的扩散性更与HFSES的扩散性更符合。在氧化条件下，观察来自TA的Nb的分馏比在其他氧气不足之处的幅度更大。在这里探索的氧气领域，欧盟在扩散方面表现出独特的变化。在减少条件下，欧盟的扩散性相对于相邻的REE元件SM和GD增加，这种效果在FMQ-3.1中最明显，并存在于在中间体（2）条件下进行的实验中。这证明了欧盟异常可以单独扩散产生。在氧化条件下，由于欧盟可能主要存在于EU3 +，因此由于欧盟扩散率与其他三价REES类似，信号消失。对于氧化还原敏感和非氧化还原敏感元件的元件扩散性，随着FO（2）的变化，有很大的系统变化。对于中间Fo（2）实验所做的所有元件的20,40和80分钟扩散性的平均值具有探索的三种氧气领域的最慢的扩散性。平均而言，整个队伍的扩散性

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