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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Partitioning of water during melting of the Earth's upper mantle at H2O-undersaturated conditions
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Partitioning of water during melting of the Earth's upper mantle at H2O-undersaturated conditions

机译：在H2O欠饱和条件下地球上地幔融化过程中的水分配

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摘要

We present the results of an experimental study of the partitioning of water between common upper mantle minerals (olivine, orthopyroxene, clinopyroxene, garnet) and silicate melt, consisting of 352 measurements in 23 hydrous melting experiments conducted over a broad range of melt water contents (1.7-25 wt.% H2O) at upper mantle conditions (1-4 GPa; 1000-1380 degrees C). Our data show that, at water-undersaturated conditions, incorporation of H2O into olivine and pyroxenes is accomplished through two independent mechanisms: a coupled substitution in which H+ and Al3+ replace Si4+ in the mineral structure, and the substitution of 2H(+) for Mg2+ previously identified in minerals hydrated at water-saturated conditions. At upper mantle temperatures and pressures < 2 GPa, these two substitution mechanisms appear to contribute approximately equal amounts of water to olivine; at higher pressures, the fugacity-dependent 2H(+)-Mg2+ substitution dominates. For orthopyroxene, coupled substitution of H+ and tetrahedral Al3+ dominates over the 2H(+)-Mg2+ Substitution at pressures < 8 GPa, while the Al-coupled substitution dominates in clinopyroxene at all pressures.
机译：我们介绍了水在普通上地幔矿物（橄榄石，正pypyrene，clinopyroxene，石榴石）和硅酸盐熔体之间分配的实验研究结果，其中包括对23种含水熔融实验进行的352次测量，这些实验涉及的熔融水含量范围广泛（在上地幔条件（1-4 GPa; 1000-1380摄氏度）下加入1.7-25 wt。％H2O。我们的数据表明，在水不饱和条件下，通过两个独立的机制将H2O掺入橄榄石和辉石中：一种是在矿物结构中H +和Al3 +取代Si4 +的偶联取代，还有2H（+）取代Mg2 +先前在水饱和条件下水合的矿物质中被发现。在上地幔温度和压力<2 GPa时，这两种取代机制似乎为橄榄石贡献了大约等量的水。在较高的压力下，与逸度有关的2H（+）-Mg2 +取代占主导地位。对于邻二甲苯，在8GPa以下的压力下，H +和四面体Al3 +的耦合取代在2H（+）-Mg2 +取代中占主导地位，而在所有压力下，铝耦合的取代在斜cl中占主导地位。

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