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首页> 外文期刊>Contributions to Mineralogy and Petrology >Pitfalls in geothermobarometry of eclogites: Fe3+ and changes in the mineral chemistry of omphacite at ultrahigh pressures
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Pitfalls in geothermobarometry of eclogites: Fe3+ and changes in the mineral chemistry of omphacite at ultrahigh pressures

机译：榴辉岩地热大气法中的Fe3 + 陷阱与超高压下的绿辉石矿物化学变化

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摘要

The relatively low-variance mineral assemblage of a talc-kyanite eclogite from Dabie Shan enabled application of both conventional geothermobarometers (garnet-clinopyroxene geothermometer and the garnet-omphacite-phengite geobarometer) and a multi-equilibrium method to determine peak P-T conditions (THERMOCALC, “average PT”). The results were highly discrepant: 840 °C / 31.1 kbar vs. 590 °C / 29.8 kbar. Mössbauer spectroscopy showed that Fe3+/Fetotal in omphacite was significantly higher than the value obtained from standard formula recalculation. When the activities were corrected for Fe endmembers, geothermobarometry gave consistent results (606 °C / 31.3 kbar vs. 585 °C / 30.8 kbar). These are close to those obtained earlier by “average PT”, confirming the robustness of the multi-equilibrium approach. The high Fe3+ concentration in omphacite is best explained using a Ca-eskola endmember Ca0.5[]0.5AlSi2O6 and allowing corresponding vacancies in the omphacite structure.
机译：大别山滑石-蓝晶石榴辉岩的矿物成分相对较低，使得既可以应用常规的地热气压计（石榴石-斜辉石地热仪，又可以通过石榴石-辉石-菲涅尔地热仪）和多平衡法确定峰值PT条件（THERMOCALC， “平均PT”）。结果差异很大：840°C / 31.1 kbar与590°C / 29.8 kbar。 Mössbauer光谱显示，辉石中的Fe3 + / Fetotal 显着高于标准配方重新计算获得的值。当对Fe端基的活性进行校正后，地热气压法得到了一致的结果（606°C / 31.3 kbar与585°C / 30.8 kbar）。这些与先前通过“平均PT”获得的结果接近，证实了多平衡方法的鲁棒性。最好使用Ca-eskola端基Ca0.5 [] 0.5 AlSi2 O6 并允许在辉石中相应的空位来解释辉石中Fe3 + 的高浓度结构体。

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