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首页> 外文期刊>Contributions to Mineralogy and Petrology >OH-defects in multiple-doped orthoenstatite at 4-8 GPa: filling the gap between pure and natural systems
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OH-defects in multiple-doped orthoenstatite at 4-8 GPa: filling the gap between pure and natural systems

机译：4-8 GPa的多掺杂正钙钛矿中的OH缺陷：填补了纯自然系统之间的空白

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摘要

OH-defects in orthoenstatite were studied experimentally between 4 and 8 GPa at 1150 degrees C in the system CaO-MgO-Al2O3-SiO2-Cr2O3-Na2O, leading to phase assemblages enstatite +/- forsterite +/- diopside +/- garnet. In enstatite coexisting with garnet, total OH is negatively correlated with pressure. Conversely, in Al-poor systems without garnet, total OH is positively correlated with pressure, and both trends intersect around 8 GPa and similar to 1000 wt ppm H2O. IR-spectra of enstatite reveal several pressure sensitive features, such as (1) the absorbance of the absorption band at 3687 cm(-1), (2) the band position near 3400 cm-1 and (3) the ratio (A(3240-3570)/A(3240-3730)) and their application as geobarometer in natural samples are evaluated. For garnet-bearing phase assemblages, the band ratio (A(3240-3570)/A(3240-3730)) in orthoenstatite defines a pressure trend in between that observed in the pure system MgO-SiO2-H2O and that found in orthopyroxenes from natural mantle peridotites, suggesting that the application of IR-spectra as proxy for pressure is justified.
机译：在CaO-MgO-Al2O3-SiO2-Cr2O3-Na2O体系中在1150摄氏度下在4 GPa和8 GPa之间实验研究了钙长石中的OH缺陷，导致相组合成顽辉石+/-镁橄榄石+/-透辉石+/-石榴石。在与石榴石共存的顽辉石中，总OH与压力呈负相关。相反，在没有石榴石的贫铝体系中，总OH与压力呈正相关，并且两种趋势在8 GPa附近相交并且类似于1000 wt ppm H2O。顽辉石的红外光谱显示出几个压敏特征，例如（1）在3687 cm（-1）处的吸收带的吸收率，（2）在3400 cm-1附近的吸收带的位置和（3）比率（A（评估了3240-3570）/ A（3240-3730））及其在自然样品中作为气压计的应用。对于含石榴石的相组合，原钙钛矿中的带比（A（3240-3570）/ A（3240-3730））定义了在纯系统MgO-SiO2-H2O中观察到的压力趋势与在天然的地幔橄榄岩，这表明使用红外光谱作为压力的代表是合理的。

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