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首页> 外文期刊>Contributions to Mineralogy and Petrology >Hydrogen incorporation in orthopyroxene: interaction of different trivalent cations
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Hydrogen incorporation in orthopyroxene: interaction of different trivalent cations

机译：氢在邻二甲苯中的掺入：不同三价阳离子的相互作用

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摘要

The incorporation of hydrogen into ferrosilite, Fe-bearing enstatite and orthopyroxene containing different trivalent cations (Cr3+ and Al3+, Cr3+ and Fe3+) was investigated experimentally at 25 kbar. Hydrogen concentration was determined by FTIR-spectroscopy on oriented crystal sections and by secondary ion mass spectroscopy, whereas Mößbauer spectroscopy and optical spectroscopy were used to characterise the valence state of Fe in orthopyroxene. Results suggest that hydrogen incorporation in ferrosilite is achieved by a similar mechanism as in pure enstatite. In Cr-bearing samples, however, hydrogen incorporation is reduced by the presence of other trivalent cations by an increased tendency to form Tschermaks substitutions, e.g. Si T 4+ + Mg M1 2+ ⇔ Al T 3+ + Cr M1 3+ . Thus, hydrogen solubility in natural orthopyroxenes from the Earth’s mantle, containing significant amounts of Cr3+, Al3+, and Fe3+, may be much more limited than expected from their trivalent cation content, as a large fraction of the trivalent cations does not participate in H-incorporating reactions as 2 Mg M1 2+ ⇔ M M1 3+ + VM1 + H i + .
机译：在25 kbar下实验研究了氢在硅铁矿，含铁的顽辉石和含有不同三价阳离子（Cr3 + 和Al3 + ，Cr3 + 和Fe3 + ）的邻苯二茂铁中的掺入。氢的浓度是通过定向晶体截面的FTIR光谱和二次离子质谱来确定的，而Mößbauer光谱和光学光谱则用来表征邻苯二茂铁中Fe的价态。结果表明，通过与纯顽辉石中相似的机理实现了硅铁矿中氢的掺入。然而，在含Cr的样品中，由于形成Tschermaks取代物的趋势增加，例如由于其他三价阳离子的存在，氢的掺入减少。 Si T 4 + + Mg M1 2 + ⇔Al T 3 + + Cr M1 3 + 。因此，来自地幔的天然邻苯二甲酚中氢的溶解度可能比其三价阳离子含量所预期的要受到限制，该溶解度中含有大量的Cr3 + ，Al3 + 和Fe3 + 。大部分三价阳离子不参与氢结合反应，因为2 Mg M1 2 + ⇔M M1 3 + + VM1 + H i + 。

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