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首页> 外文期刊>Physics of the Earth and Planetary Interiors: A Journal Devoted to Obsevational and Experimerntal Studies of the Chemistry and Physics of Planetary Interiors and Their Theoretical Interpretation >Trace element partitioning during partial melting of carbonated eclogites
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Trace element partitioning during partial melting of carbonated eclogites

机译：碳酸榴辉岩部分熔融过程中的微量元素分配

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摘要

Crystal/melt partition coefficients for Sr, U, and three Rare Earth Elements (La, Gd and Yb) have been measured during melting of carbonated eclogitic composition in the 4-7 GPa range. The experiments were conducted in a multi-anvil apparatus. Trace element concentrations were determined using electron microprobe and laser ablation ICP-MS in some cases. The obtained clinopyroxene/melt partition coefficients are very low whether the melt is silicate or carbonate in nature. This feature is due to Na presence and high vacancy concentration in the clinopyroxene. On the other hand, garnet/melt partition coefficients fall at the lower limit of or are slightly lower than literature data dealing with carbonate melt-bearing systems. We note that clinopyroxene/carbonated melt partition coefficient values for the Rare Earth Elements cannot be modeled using the lattice strain model. The reasons for the discrepancy lie on assumptions about melt structure as well as clinopyroxene solution model. In the latter case, high Na combined with high vacancy concentration precludes ideal mixing on octahedral sites to be a valid assumption. Taking charge balance on clinopyroxene crystallographic sites does not solve the discrepancy, suggesting that melt structure can be important. Garnet/melt partition coefficients can be predicted but we note a possible influence of the melt structure. The newly obtained partition coefficients have been used to test some simple models of mantle metasomatism.
机译：Sr，U和三种稀土元素（La，Gd和Yb）的晶体/熔体分配系数已在4-7 GPa范围内的碳酸盐化火山岩成分熔融过程中进行了测量。实验在多砧装置中进行。在某些情况下，使用电子探针和激光烧蚀ICP-MS测定痕量元素的浓度。无论熔体本质上是硅酸盐还是碳酸盐，所获得的斜茂铁/熔体分配系数都非常低。此特征是由于在斜柏基中存在Na和高空位浓度。另一方面，石榴石/熔体分配系数低于碳酸盐熔体体系的文献数据的下限或略低。我们注意到，不能使用晶格应变模型来建模稀土元素的斜茂铁/碳酸熔体分配系数值。出现差异的原因在于关于熔体结构以及斜辉石溶液模型的假设。在后一种情况下，高Na结合高空位浓度排除了八面体位点上的理想混合是有效的假设。在斜向辉石的晶体学位置进行电荷平衡并不能解决差异，这表明熔体结构可能很重要。石榴石/熔体分配系数可以预测，但我们注意到熔体结构的可能影响。新获得的分配系数已用于测试地幔交代作用的一些简单模型。

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