Hydrogen incorporation in enstatite in the system MgO–SiO2–H2O–NaCl
Hydrogen incorporation in enstatite in the system MgO–SiO2–H2O–NaCl
复制标题
MgO-SiO2-H2O-NaCl 体系中顽辉石中的氢掺入
DOI：
10.1007/s00410-008-0306-0
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发表时间：
2008
影响因子：
3.5
通讯作者：
K. Simon
中科院分区：
文献类型：
--
作者：
R. Stalder;A. Kronz;K. Simon
本文研究了在25 kbar压力下，在含有不同量NaCl的含水体系中顽火辉石的氢结合。顽火辉石中的氢含量与体系中的NaCl浓度呈明显的负相关。最有利的解释是由于稀释而降低了水逸度。在高氯化钠水平下有限的氢掺入的其他原因，如Na+对缺陷化学的显著影响或顽火辉石中OH-和Cl−之间的交换，似乎不那么重要。可以确定分配系数DNaEn/Fluid = 0.0013，表明Na在顽火辉石中的不相容性小于H。新的结果支持了这样一种观点，即在估计名义上无水矿物的总储氢能力时，必须考虑溶解组分，特别是在具有高水平卤素的地质环境中，如俯冲带。
The incorporation of hydrogen in enstatite in a hydrous system containing various amounts of NaCl was investigated at 25 kbar. The hydrogen content in enstatite shows a clear negative correlation to the NaCl-concentration in the system. The most favourable explanation is the reduction of water fugacity due to dilution. Other reasons for the limited hydrogen incorporation at high NaCl levels, such as a significant influence of Na+ on the defect chemistry or an exchange between OH- and Cl−in enstatite, appear much less important. A partition coefficient DNaEn/Fluid = 0.0013 could be determined, demonstrating that Na is less incompatible in enstatite than H. The new results support the idea that dissolved components have to be considered when the total hydrogen storage capacity in nominally anhydrous minerals is estimated, especially in geological settings with high levels of halogens, such as subduction zones.