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首页> 外文期刊>Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society >The storage capacity of fluorine in olivine and pyroxene under upper mantle conditions
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The storage capacity of fluorine in olivine and pyroxene under upper mantle conditions

机译：橄榄石和辉石中氟的储存能力在上部搭防条件下

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摘要

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 + MgF2 at temperatures between 1350 degrees C and 1700 degrees C and pressures up to 17 GPa. Electron microprobe measurements show that fluorine concentrations in olivine reach up to 5100 mu g/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 mu g/g. Our data show that concentrations of fluorine in fluorinesaturated 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. (C) 2017 Elsevier Ltd. All rights reserved.
机译：我们对地球地幔中橄榄石和垂直烯的氟储存能力提出了新的实验结果。在1350℃和1700℃的温度下在系统MgO-SiO 2 + MgF 2中进行实验，并压力至17GPa。电子微探测测量显示橄榄石中的氟浓度达到5100μmg/ g。 Olivine中氟的储存能力仅显示了小的压力依赖性，而是强烈的温度依赖性，在增加温度和氟储存能力之间的正相关性。在福尔特石中发现的氟浓度是一种级别较小，达到670μg/ g。我们的数据表明，氟饱和橄榄胺中的氟浓度与橄榄石中的水浓度相同。然而，橄榄石中的氟和水溶性显示出具有增加的压力和温度的相反行为。橄榄石中的氟溶解度随着温度的增加而增加，但受到压力的影响并不多。相反，橄榄石中的水溶性先前已被证明随着温度的增加和随着压力的增加而增加而降低。我们的实验表明，如Forsterite和Enstatite这样的名义上无氟矿物能够储存上部地幔的整个氟预算，而无需调用磷灰石或锥体等附属阶段。 （c）2017 Elsevier Ltd.保留所有权利。

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