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首页> 外文期刊>The American mineralogist >Parameterized lattice strain models for REE partitioning between amphibole and silicate melt
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Parameterized lattice strain models for REE partitioning between amphibole and silicate melt

机译：参数化晶格菌株模型，用于阳性硅酸盐和硅酸盐熔体

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The distribution of rare earth elements (REEs) between amphibole and silicate melt is important for understanding a wide variety of igneous and metamorphic processes in the lithosphere. In this study, we used published experimental REE and Y partitioning data between amphibole and silicate melt, the lattice strain model, and nonlinear least-squares regression method to parameterize key partitioning parameters in the lattice strain model (D-0, r(0), and E) as a function of pressure, temperature, and both amphibole and melt compositions. Two models, which give nearly identical results, are obtained in this study. In the first model, D-0 depends on temperature and amphibole composition: it positively correlates with Ti content and negative correlates with temperature and Mg, Na, and K contents in the amphibole. In the second model, D-0 depends solely on the melt composition: it positively correlates with Si content and negatively correlates with Ti and Ca contents in the melt. In both the mineral and melt composition models, r(0) negatively correlates with the ferromagnesian content in the M4 site of the amphibole, and E is a constant. The very similar coefficients in the equations for r(0) and best-fit values for E in the two models allow us to connect the two models through amphibole-melt phase equilibria. An application of our model to amphiboles in mantle xenoliths shows that observed major element compositional variations in amphibole alone can give rise to order of magnitude variations in amphibole-melt REE partition coefficients. Together with experimental data simulating fractional crystallization of arc magmas, out models suggest that: (1) REE partition coefficients between amphibole and melt can vary by an order of magnitude during arc magma crystallization due to variation in the temperature and composition of the amphibole and melt, and that (2) amphibole fractional crystallization plays a key role in depleting the middle REEs relative to heavy REEs and lig
机译：蒙吡咯和硅酸盐熔体之间的稀土元素（REEE）的分布对于了解岩石圈中的各种火球和变质过程非常重要。在本研究中，我们在锥体和硅酸盐熔体，晶格应变模型和非线性最小二乘回归方法之间使用了已发表的实验REE和Y分区数据，以参数化晶格应变模型中的关键分区参数（D-0，R（0）和e）作为压力，温度和熔融组合物的函数。在本研究中获得了两个提供了几乎相同的结果的模型。在第一型号模型中，D-0取决于温度和锥形合成部分：它与Ti含量与锥体中的温度和Mg，Na和K含量呈正相关。在第二种模型中，D-0仅取决于熔体组合物：它与Si含量呈正相关，并与熔体中的Ti和Ca含量负相关。在矿物和熔融组合物模型中，R（0）与锥体M4位点中的铁磁性含量负相关，e是恒定的。在两个模型中的R（0）和E的最佳拟合值中的等式中的非常相似的系数允许我们通过Amphibole-Melt相平衡连接两种模型。我们的模型在Mantle Xenoliths中的两栖组的应用表明，仅观察到单独的锥体的主要元素组成变化可以产生锥形熔体REE分配系数的幅度变化的阶数。与模拟弧形磁带的分数结晶的实验数据一起建议：（1）锥体和熔体之间的REE分配系数可以在弧形岩浆结晶期间通过变化和熔融的温度和组成的变化，在弧形岩浆结晶期间的数量级变化（2）（2）Amphibole分数结晶在耗尽中间簧片相对于重型REES和LIG中起着关键作用

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