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首页> 外文期刊>Contributions to Mineralogy and Petrology >Low-pressure-temperature stability of pyrope plus quartz relative to orthopyroxene plus kyanite: a new model for aluminous orthopyroxene with vacancies
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Low-pressure-temperature stability of pyrope plus quartz relative to orthopyroxene plus kyanite: a new model for aluminous orthopyroxene with vacancies

机译：Pyrope的低压 - 温度稳定性加上正畸酮和kyanite：铝骨质缺失具有空缺的新模型

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摘要

Determination of the stability of pyrope with quartz could provide theoretical pressure-temperature (P-T) constraints on silica-saturated eclogites as well as near end-member pyrope-bearing terrains. The lower P-T stability of pyrope in the presence of quartz in the system MgO-Al2O3-SiO2 can be modeled by the reaction: 3 enstatite+2 kyanite=2 pyrope+2 quartz. Reaction reversals were experimentally obtained using a 1/2-in.-diameter piston-cylinder press and a 1000-t multi-anvil press. Besides natural quartz, all other starting materials, including orthopyroxene, pyrope, and kyanite were synthesized. The reaction has been bracketed at 1.50 GPa at 1040-1080 degrees C; 1.69-1.79 GPa at 1000 degrees C; 2.26 GPa at 920-940 degrees C; 2.90 GPa at 840-860 degrees C. The bracketed boundary is higher in temperature and pressure than that calculated using the newest dataset of Holland et al. (J Petrol 59:881-900, 10.1093/petrology/egy048, 2018), particularly at higher pressures. Aluminum is usually thought to be taken into orthopyroxene in the form of Mg-Tschermak's pyroxene (MgTs; MgAl2SiO6) under these experimental P-T conditions. In contrast, the observed orthopyroxene composition indicated the involvement of a non-stoichiometric component Mg-Eskola pyroxene (MgEs; Mg-0.5?0.5AlSi2O6), an aluminous orthopyroxene with octahedral vacancies (?). End-member thermodynamic properties for MgEs as well as a mixing model for the ternary enstatite-MgTs-MgEs solid solution have been derived. The thermodynamic calculations, employing the mixing model, are in good agreement with the experimental brackets. The new model has potential applications to constrain P-T conditions of tectonic settings such as ultrahigh-pressure and ultrahigh-temperature metamorphisms.
机译：用石英染色的稳定性的测定可以为二氧化硅饱和eGlogites以及近端构件的含有波纹的地形提供理论压力 - 温度（P-T）约束。在系统MgO-Al2O3-SiO 2中存在石英氏菌的较低P-T稳定性可以通过反应进行模拟：3 enstatite + 2 kyanite = 2丙位+ 2石英。使用1/2-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-IN-TIM-TOMINO-ANVIL压机进行反应逆转。除了天然石英，还合成了所有其他原料，包括垂直酸酯，吡咯和血晶钛料。反应已在1040-1080摄氏度下括起来为1.50GPa; 1.69-1.79 GPA以1000度C; 2.26 GPA 920-940摄氏度; 2.90 GPA在840-860℃。括号边界的温度和压力高于使用荷兰等人的最新数据集计算。 （J汽油59：881-900,10.1093 /岩石学/ EY048,2018），特别是在更高的压力下。通常认为铝通常在这些实验P-T条件下以Mg-Tschermak的辉石（MgTS; MgAl2SiO6）的形式进入正交性。相反，观察到的矫形烯组合物表明了非化学计量组分Mg-Eskola辉石（升温; Mg-0.5≤0.5Alsi2O6），含有八面体空位（α）的铝矫形器。升温的末端成员热力学性能以及三元山牙酸酯-MgTs-MgS固体溶液的混合模型。采用混合模型的热力学计算与实验支架吻合良好。新模型具有潜在的应用，以限制构造诸如超高压和超高温变质等构造环境的P-T条件。

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