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首页> 外文期刊>Contributions to Mineralogy and Petrology >An experimental study of the Fe oxidation states in garnet and clinopyroxene as a function of temperature in the system CaO–FeO–Fe2O3–MgO–Al2O3–SiO2: implications for garnet–clinopyroxene geothermometry
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An experimental study of the Fe oxidation states in garnet and clinopyroxene as a function of temperature in the system CaO–FeO–Fe2O3–MgO–Al2O3–SiO2: implications for garnet–clinopyroxene geothermometry

机译：石榴石和斜发rox中铁的氧化态随温度的变化的实验研究CaO–FeO–Fe2O3–MgO–Al2O3–SiO2系统中温度的函数：石榴石–斜发rox地热法的意义

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摘要

Samples with eclogitic composition in the system CaO–FeO–Fe2O3–MgO–Al2O3–SiO2 were produced from various kinds of starting materials held in graphite-lined Pt capsules at a pressure of 2.5–3.0 GPa and temperatures of 800–1,300 °C using a piston-cylinder or Belt apparatus. Garnets and clinopyroxenes were characterized by analytical transmission electron microscopy and electron probe micro-analysis (EPMA). Fe3+/ΣFe ratios determined by electron energy-loss spectroscopy (EELS) decrease in clinopyroxene from 22.2 ± 3.4 % at 800 °C to 13.3 ± 5.4 % at 1,300 °C, while in garnet, they vary between 10.8 ± 1.5 and 15.4 ± 4.7 %, respectively. Temperature estimates according to Krogh (Contrib Mineral Petrol 99:44–48, 1988) reproduce the experimental temperature to ±60 °C without systematic deviations if total iron is used in the calculation. If only the Fe2+ content is used, which was obtained by combining EPMA and EELS results, the experimental temperature is underestimated by 33 °C on average at 800–1,200 °C and overestimated by 77 °C on average at 1,300 °C. These systematic deviations can be explained by the temperature-dependent ratio of Fe2+/ΣFe in garnet divided by that in clinopyroxene. Since the difference between the calculated and experimental temperature is relatively small, a Fe2+-based recalibration of the thermometer appears not to be necessary for the investigated system in the range of pressure, temperature and composition covered by the experiments of this study.
机译：在CaO–FeO–Fe2O3–MgO–Al2O3–SiO2系统中具有易挥发成分的样品，是由保存在衬有石墨的Pt胶囊中的各种原材料制成的，压力为2.5–3.0GPa，温度为800–1,300°C，活塞缸或皮带装置。用透射电子显微镜和电子探针显微分析（EPMA）对石榴石和斜柏石进行表征。通过电子能量损失谱（EELS）测定的Fe3 + /ΣFe比值在斜辉石中从800°C时的22.2±3.4％降至1,300°C时的13.3±5.4％，而在石榴石中，它们的变化范围为10.8±1.5和15.4±4.7 ％， 分别。如果使用总铁计算，根据Krogh（Contrib Mineral Petrol 99：44–48，1988）进行的温度估算可将实验温度重现为±60°C，而不会出现系统偏差。如果仅使用通过结合EPMA和EELS结果获得的Fe2 +含量，则实验温度在800–1,200°C时平均低估了33°C，而在1,300°C时平均低估了77°C。这些系统性偏差可以用石榴石中Fe2 + /ΣFe的温度相关比率除以斜柏基中的比率来解释。由于计算出的温度与实验温度之间的差异较小，因此在本研究实验涵盖的压力，温度和成分范围内，对于被研究系统而言，对温度计进行基于Fe2 +的重新校准似乎是不必要的。

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