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首页> 外文期刊>Contributions to Mineralogy and Petrology >Crystal chemical controls on rare earth element partitioning between epidote-group minerals and melts: an experimental and theoretical study
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Crystal chemical controls on rare earth element partitioning between epidote-group minerals and melts: an experimental and theoretical study

机译：晶体化学控制稀土元素族矿物与熔体之间分配的实验和理论研究

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摘要

We have experimentally determined the partitioning of REE (rare earth elements) between zoisite and hydrous silicate melt at 1,100 deg C and 3 GPa. All REE behave moderately compatible in zoisite with respect to the melt and all D_(REE)~(zo/melt) show a smooth parabolic dependence on ionic radius. The partitioning parabola peaks at Nd (D_(Nd)~(zo/melt) = 4.9), and the compatibility slightly decreases towards La (D_(La)~(zo/melt) = 3.9) and decreases by half an order of magnitude towards Yb (D_(Yb)~(zo/melt) = 1.1). Application of the elastic strain model of Blundy and Wood (1994) to the available zoisite and allanite REE mineral/melt partitioning data and comparison with partitioning pattern calculated from a combination of structural and physical data (taken from the literature) with the elastic strain model suggest that in zoisite REE prefer the Al-site and that only La and Ce are incorporated into the A2-site in significant amounts. In contrast, in allanite, all REE are preferentially incorporated into the large and highly co-ordinated A2 site. As a result, zoisite fractionates the MREE effectively from the HREE and moderately from the LREE, while allanite fractionates the LREE very effectively from the MREE and HREE. Consequently, the presence of either zoisite or allanite during slab melting will lead to quite different REE pattern in the produced melt.
机译：我们已经通过实验确定了在1100摄氏度和3 GPa的条件下，铝酸盐和水合硅酸盐熔体中REE（稀土元素）的分配。所有稀土元素在沸石中均表现出相对于熔体的适度相容性，并且所有D_（REE）〜（zo / melt）均显示出对离子半径的平滑抛物线依赖性。分配抛物线在Nd（D_（Nd）〜（zo / melt）= 4.9）达到峰值，相容性向La方向略有下降（D_（La）〜（zo / melt）= 3.9）并降低了一半数量级朝向Yb（D_（Yb）〜（zo / melt）= 1.1）。将布隆迪和伍德（1994）的弹性应变模型应用到可用的黄铁矿和长石REE矿物/熔体分配数据中，并与根据结构和物理数据（取自文献）结合弹性应变模型计算出的分配模式进行比较这表明在硬沸石中，REE更偏爱铝位点，只有La和Ce大量掺入A2位点。相比之下，在尿囊石中，所有REE均优先纳入大型且高度协调的A2站点。结果，硅沸石从HREE有效地分离MREE，从LREE中度分离，而尿囊石从MREE和HREE非常有效地分离LREE。因此，在板坯熔化过程中，无论是铁沸石还是尿囊石的存在，都会在生产的熔体中导致完全不同的稀土元素分布。

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