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首页> 美国卫生研究院文献>Journal of Zhejiang University. Science. B >Discovery of ultrahigh-T spinel-garnet granulite with pure CO2fluid inclusions from the Altay orogenic belt NW China
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Discovery of ultrahigh-T spinel-garnet granulite with pure CO2fluid inclusions from the Altay orogenic belt NW China

机译：从中国西北阿勒泰造山带中发现含纯CO2流体包裹体的超高T尖晶石-石榴石花岗石

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We first report discovery of the spinel-garnet-orthopyroxene granulite with pure CO2 fluid inclusions from the Fuyun region of the late Paleozoic Altay orogenic belt in Central Asia, NW China. The rock is characterized by an assemblage of garnet, orthopyroxene, spinel, cordierite, biotite, plagioclase and quartz. Symplectites of orthopyroxene and spinel, and orthopyroxene and cordierite indicate decompression under UHT conditions. Mineral chemistry shows that the orthopyroxenes have high XMg and Al2O3 contents (up to 9.23 wt%). Biotites are enriched in TiO2 and XMg and are stable under granulite facies conditions. The garnet and quartz from the rock carry monophase fluid inclusions which show peak melting temperatures of around −56.7 °C, indicating a pure CO2 species being presented during the ultrahigh-T metamorphism in the Altay orogenic belt. The inclusions homogenize into a liquid phase at temperatures around 15.3–23.8 °C translating into CO2 densities of the order of 0.86–0.88 g/cm3. Based on preliminary mineral paragenesis, reaction textures and petrogenetic grid considerations, we infer that the rock was subjected to UHT conditions. The CO2-rich fluids were trapped during exhumation along a clockwise P-T path following isothermal decompression under UHT conditions.
机译：我们首先报道了来自中西北地区晚古生代阿勒泰造山带阜云地区含纯二氧化碳流体包裹体的尖晶石-石榴石-邻苯二茂基花岗石的发现。岩石的特征是石榴石，邻苯二酚，尖晶石，堇青石，黑云母，斜长石和石英。邻辉石和尖晶石的混合物，以及邻辉石和堇青石的混合物表明在超高温条件下减压。矿物化学表明邻苯二甲酚具有较高的XMg和Al2O3含量（最高9.23 wt％）。黑云母富含TiO2和XMg，在花岗石相条件下稳定。岩石中的石榴石和石英带有单相流体包裹体，它们的峰值熔融温度约为-56.7°C，这表明在阿尔泰造山带的超高T变质过程中呈现出纯净的CO2物种。夹杂物在约15.3–23.8°C的温度下均质化为液相，转化为CO2密度约为0.86-0.88 g / cm 3 。基于初步的矿物共生作用，反应质地和岩石成因网格的考虑，我们推断该岩石处于超高温条件下。在UHT条件下等温减压后，沿顺时针P-T路径挖掘尸体时捕获了富含CO2的流体。

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