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首页> 外文期刊>Contributions to Mineralogy and Petrology >Influence of hydrogen on Fe-Mg interdiffusion in (Mg,Fe)O and implications for Earth's lower mantle
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Influence of hydrogen on Fe-Mg interdiffusion in (Mg,Fe)O and implications for Earth's lower mantle

机译：氢对（Mg，Fe）O中Fe-Mg相互扩散的影响及其对地球下地幔的影响

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Interdiffusion of Fe and Mg in (Mg,Fe)O has been investigated experimentally under hydrous conditions. Single crystals of MgO in contact with (Mg_(0.73)Fe_(0.27))O were annealed hydrothermally at 300 MPa between 1,000 and l,250 deg C and using a Ni-NiO buffer. After electron microprobe analyses, the dependence of the interdiffusivity on Fe concentration was determined using a Boltzmann-Matano analysis. For a water fugacity of approx 300 MPa, the Fe-Mg interdiffusion coefficient in Fe_xVlg_(1-x)O with 0.01 < = x < = 0.25 can be described by D = D_0x~B exp~(-(Q + Cx)/RT) with D_0 = (5 + - 1) X 10~(-4) m~2 S~(-1), Q = 270 + - 20kJmor~(-1), B= 0.8 + - 0.1, and C =-80 + -10 kJ mol~(-1). For x = 0.1 and at l,000 deg C, Fe-Mg interdiffusion is a factor of approx 4 faster under hydrous than under anhydrous conditions. This enhanced rate of interdiffusion is attributed to an increased concentration of metal vacancies resulting from the incorporation of hydrogen. Such water-induced enhancement of kinetics may have important implications for the rheological properties of the lower mantle.
机译：Fe和Mg在（Mg，Fe）O中的互扩散已经在含水条件下进行了实验研究。将与（Mg_（0.73）Fe_（0.27））O接触的MgO单晶在300 MPa和1,000-1,250摄氏度之间使用Ni-NiO缓冲液进行水热退火。在进行电子探针分析后，使用Boltzmann-Matano分析确定互扩散性对Fe浓度的依赖性。对于大约300 MPa的水逸度，Fe_xVlg_（1-x）O中的Fe-Mg互扩散系数为0.01 <= x <= 0.25可以用D = D_0x〜B exp〜（-（Q + Cx）/ RT），其中D_0 =（5 +-1）X 10〜（-4）m〜2 S〜（-1），Q = 270 +-20kJmor〜（-1），B = 0.8 +-0.1，C = -80 + -10 kJ mol〜（-1）。当x = 0.1且在1000摄氏度时，Fe-Mg互扩散在无水条件下比无水条件快约4倍。这种相互扩散的速率提高归因于由于氢的结合而导致的金属空位浓度的增加。这种水诱导的动力学增强可能对下地幔的流变性质具有重要意义。

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