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首页> 外文期刊>Contributions to Mineralogy and Petrology >Geobarometry for spinel peridotites using Ca and Al in olivine
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Geobarometry for spinel peridotites using Ca and Al in olivine

机译：用橄榄石使用Ca和Al的Spinel Peridotites的地质测量术

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Experiments were performed from 950 to 1250 °C and 1.5-2.4 GPa to determine the effect of pressure (P) on the temperature (T)dependent partitioning of Al between olivine and spinel, using mixtures of natural spinel, olivine, clino- and ortho-pyroxene. When compared to 100 kPa experiments, the results show that there is no discernible effect of pressure on the Al-in-olivine thermometer at PT conditions relevant to the spinel peridotite facies. In our experiments with high-Cr spinel, we see no change in Al in olivine from starting values, likely due to the refractory nature of high-Cr spinel. Phase boundary flourescence prevented accurate quantification of Ca in olivine in the run products by electron microprobe analysis but measurements by laser ablation are consistent with the Kohler and Brey (Geochim Cosmochim Acta 54:2375-2388, 1990) Ca-in-olivine thermobarometer. The combination of Al (for T) and Ca (for P) in olivine thus has great potential for thermobarometry in spinel facies peridotites. As a test we apply this approach to published high precision Ca and Al data for olivine from the Ray Pic spinel peridotite xenoliths from the Massif Central (De Hoog et al. Chem Geol 270:196-215, 2010). Reassuringly, the calculated PT conditions (1.0-1.8 GPa; 900-1080 °C) for all samples lie beneath the Moho, within the spinel peridotite facies and fall along a geophysically constrained geotherm.
机译：实验从950-1250℃和1.5-2.4 GPA进行，以确定压力（p）对橄榄石和尖晶石之间Al的温度（t）依赖性分配的影响，使用天然尖晶石，橄榄石，Clino-和ortho的混合物-Pyroxene。与100kPa实验相比，结果表明，与尖晶石橄榄石相比的PT条件下，橄榄石病毒仪没有可辨别的压力效果。在我们用高Cr尖晶石的实验中，我们认为Olivine在起始值中没有变化，可能是由于高Cr尖晶石的耐火性质。通过电子微探针分析，相位边界荧光防止了橄榄石中的橄榄石中的Ca的准确定量，但激光消融的测量与Kohler和Brey（Geochim Cosmochim Acta 54：2375-2388,1990）的Ca-In-Olivine ThermoRometer。因此，Olivine中的Al（对于T）和Ca（对于p）的组合在尖晶石相偏见中具有巨大的热能测量仪的潜力。作为测试，我们将这种方法应用于从Massif Central（De Hoog等人）从Massif Central的Ray Pic Spinel Peridotite Xenoliths发表高精度Ca和Al数据（De Hoog等人。化学Geol 270：196-215，2010）。放心地，所有样本的计算的PT条件（1.0-1.8GPa; 900-1080°C）位于Moho下方，在尖晶石橄榄石相间，沿着地球物理地的地热落下。

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