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首页> 外文期刊>Contributions to Mineralogy and Petrology >Garnet and spinel in fertile and depleted mantle: insights from thermodynamic modelling
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Garnet and spinel in fertile and depleted mantle: insights from thermodynamic modelling

机译：石榴石和尖晶石在肥沃和贫瘠的地幔中：热力学建模的见解

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摘要

We performed thermodynamic calculations based on model and natural peridotitic compositions at pressure and temperature conditions relevant to the Earth's upper mantle, using well-established free energy minimization techniques. The model is consistent with the available experimental data in Cr-bearing peridotitic systems and can therefore be used to predict phase relations and mineral compositions in a wide range of realistic mantle compositions. The generated phase diagrams for six different bulk compositions, representative of fertile, depleted and ultra-depleted peridotitic mantle, shown that the garnet + spinel stability field is always broad at low temperatures and progressively narrows with increasing temperatures. In lithospheric sections with hot geotherms (ca. 60 mW/m~2), garnet coexists with spinel across an interval of 10-15 km, at ca. 50-70 km depths. In colder, cratonic, lithospheric sections (e.g. along a 40 mW/m2 geotherm), the width of the garnet-spinel transition strongly depends on bulk composition: In fertile mantle, spinel can coexist with garnet to about 120 km depth, while in an ultra-depleted harzburgitic mantle, it can be stable to over 180 km depth.
机译：我们使用成熟的自由能最小化技术，在与地球上地幔有关的压力和温度条件下，基于模型和天然橄榄岩成分进行了热力学计算。该模型与含铬橄榄石系统中的可用实验数据一致，因此可用于预测各种现实地幔成分中的相关系和矿物成分。生成的六种不同的大块成分的相图分别代表了肥沃的，贫化的和超贫化的橄榄岩地幔，表明石榴石+尖晶石的稳定性场在低温下始终很宽，并且随着温度的升高而逐渐变窄。在具有高温地热（约60 mW / m〜2）的岩石圈剖面中，石榴石与尖晶石共存，间隔大约10-15 km，大约为。 50-70公里深度。在较冷的克拉通岩石圈区域（例如，沿40 mW / m2的地热），石榴石-尖晶石过渡的宽度强烈取决于整体成分：在肥沃的地幔中，尖晶石可与石榴石共存至约120 km深度，而在超耗尽的哈茨堡地幔，可以稳定到180公里以上的深度。

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