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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Simplicity in melt densification in multicomponent magmatic reservoirs in Earth’s interior revealed by multinuclear magnetic resonance
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Simplicity in melt densification in multicomponent magmatic reservoirs in Earth’s interior revealed by multinuclear magnetic resonance

机译：多核磁共振揭示了地球内部多组分岩浆储层熔体致密化的简单性

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摘要

Pressure-induced changes in properties of multicomponent silicate melts in magma oceans controlled chemical differentiation of the silicate earth and the composition of partial melts that might have formed hidden reservoirs. Although melt properties show complex pressure dependences, the melt structures at high pressure and the atomistic origins of these changes are largely unknown because of their complex pressure–composition dependence, intrinsic to multicomponent magmatic melts. Chemical constraints such as the nonbridging oxygen (NBO) content at 1 atm, rather than the structural parameters for melt polymerization, are commonly used to account for pressure-induced changes in the melt properties. Here, we show that the pressure-induced NBO fraction in diverse silicate melts show a simple and general trend where all the reported experimental NBO fractions at high pressure converge into a single decaying function. The pressure-induced changes in the NBO fraction account for and predict the silica content, nonlinear variations in entropy, and the transport properties of silicate melts in Earth’s mantle. The melt properties at high pressure are largely different from what can be predicted for silicate melts with a fixed NBO fraction at 1 atm. The current results with simplicity in melt polymerization at high pressure provide a molecular link to the chemical differentiation, possibly missing Si content in primary mantle through formation of hidden Si-rich mantle reservoirs.
机译：岩浆海洋中压力引起的多组分硅酸盐熔体性质的变化控制着硅酸盐地球化学分化以及可能形成隐藏储层的部分熔体的成分。尽管熔体性质表现出复杂的压力依赖性，但由于多组分岩浆熔体固有的复杂的压力-成分依赖性，因此在高压下的熔体结构和这些变化的原子起源基本上是未知的。化学约束条件（例如1 atm的非桥连氧（NBO）含量）而非熔体聚合的结构参数通常用于解决压力引起的熔体性能变化。在这里，我们表明，在各种硅酸盐熔体中，压力诱导的NBO馏分表现出一种简单而普遍的趋势，其中所有报告的高压实验NBO馏分都汇聚成一个衰减函数。压力引起的NBO分数变化解释并预测了二氧化硅的含量，熵的非线性变化以及硅酸盐在地幔中的传输特性。高压下的熔体特性与NBO分数固定为1 atm的硅酸盐熔体的预测值大不相同。当前在高压下进行简单熔融聚合的结果提供了与化学差异的分子联系，可能通过形成隐藏的富含硅的地幔储层而失去了主要地幔中的硅含量。

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