The storage capacity of fluorine in olivine and pyroxene under upper mantle conditions
The storage capacity of fluorine in olivine and pyroxene under upper mantle conditions
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上地幔条件下橄榄石和辉石中氟的储存能力
DOI:
10.1016/j.gca.2017.03.043
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发表时间:
2017
影响因子:
5
通讯作者:
Klemme
中科院分区:
文献类型:
--
作者:
Grützner;Bromiley;Rohrbach;Berndt;Klemme
We present new experimental results on the fluorine storage capacity of olivine and orthopyroxene in the Earth’s mantle. Experiments were performed in the system MgO-SiO2+ MgF2at temperatures between 1350 °C and 1700 °C and pressures up to 17 GPa. Electron microprobe measurements show that fluorine concentrations in olivine reach up to 5100 µg/g. The storage capacity of fluorine in olivine shows only a small pressure dependence but a strong temperature dependence with a positive correlation between increasing temperature and fluorine storage capacity. Fluorine concentrations found in enstatite are one order of magnitude smaller and reach up to 670 µg/g. Our data show that concentrations of fluorine in fluorine-saturated olivine are in the same range as water concentrations in olivine. Nevertheless, fluorine and water solubility in olivine show opposing behavior with increasing pressure and temperature. The fluorine solubility in olivine increases with increasing temperature but is not much affected by pressure. In contrast, water solubility in olivine has previously been shown to decrease with increasing temperature and increase with increasing pressure. Our experiments show that nominally fluorine-free minerals like forsterite and enstatite are capable of storing the entire fluorine budget of the upper mantle, without the need to invoke accessory phases such as apatite or amphibole.
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DOI:
--
发表时间:
1995
期刊:
影响因子:
--
作者:
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通讯作者:
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影响因子:
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影响因子:
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