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首页> 外文期刊>Contributions to Mineralogy and Petrology >Experimental calibration of a garnet-clinopyroxene geobarometer for mantle eclogites
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Experimental calibration of a garnet-clinopyroxene geobarometer for mantle eclogites

机译：石榴石-斜辉石测压仪对地幔榴辉岩的实验校准

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Thermodynamic parameters have been calibrated for a geobarometer suitable for use on eclogitic mantle xenoliths. The barometer is based on the incorporation of tetrahedrally coordinated aluminum in clinopyroxene coexisting with garnet and has been calibrated using the results of piston cylinder and multi-anvil experiments performed between pressures of 3 and 7 GPa and temperatures from 1,200 to 1,550 degrees C. Starting materials were hydrous and anhydrous synthetic mixtures of basaltic bulk compositions that yielded homogeneous bimineralic garnet-clinopyroxene phase assemblages. The experimental data set was expanded by employing results from previous experimental studies conducted in eclogitic systems, which widened the range of applicable conditions and compositions. The calibration reproduces experimental pressures of bimineralic eclogite assemblages, in addition to SiO2-saturated and kyanite-bearing eclogites, to within 0.4 GPa at the 95 % confidence interval. The barometer was then used to examine equilibration pressures recorded by natural mantle eclogites from various xenolith locations covering a wide pressure, temperature, and compositional range.
机译：已经针对适用于浮闪地幔异种岩的地压仪对热力学参数进行了校准。晴雨表是基于在与石榴石共存的斜茂铁中掺入四面体配位的铝，并已使用活塞缸和在3至7 GPa的压力和1,200至1,550℃的温度之间进行的多砧实验的结果进行了校准。为玄武质本体组合物的含水和无水合成混合物，产生均质的双矿物石榴石-斜向茂相组合。实验数据集通过利用以前在电泳系统中进行的实验研究的结果得到扩展，从而扩大了适用条件和成分的范围。校准可将除SiO2饱和的和含蓝晶石的榴辉岩以外的双矿物榴辉岩组合的实验压力重现到95％置信区间的0.4 GPa以内。然后，使用气压计检查来自各种异岩体位置的天然地幔榴辉岩记录的平衡压力，该压力涵盖宽的压力，温度和组成范围。

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