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首页> 外文期刊>Contributions to Mineralogy and Petrology >Fluid inclusions as metamorphic process indicators in the Southern Aravalli Mountain Belt (India)
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Fluid inclusions as metamorphic process indicators in the Southern Aravalli Mountain Belt (India)

机译：流体包裹体在印度南部Aravalli山区的变质过程指示中

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Fluid inclusions from a biotite-garnet schist in the Southern Aravalli Mountain Belt (India) give information on both peak metamorphic conditions and post-peak metamorphic processes during uplift. A combination of careful petrography, microthermometry and Raman spectroscopy reveals the presence of at least five generations of enclosed fluids. Lower amphibolite-facies pressure-temperature conditions of the growth of garnet rims are reproduced by the highest fluid density of the relatively oldest inclusion type of CO_2 (+- N_2)-rich compositions. A calculated fluid composition in the COH system, in equilibrium with the graphite buffer corresponds to a CO_2-rich fluid at metamorphic conditions. However, the results of these calculations are very sensitive to small fluctuations in oxygen fugacity and the accuracy of thermodynamic properties of mineral equilibria. Re-equilibration, conceived by specific size-density distribution and the absence of an aqueous phase in inclusions that contain nahcolite crystals, is monitored in these inclusions as post-peak metamorphic processes, like partial decrepitation and preferential leakage. The other fluid types represent heterogeneous fluid trapping of coexisting aqueous NaCl-bearing solutions with CO_2-CH_4.rich vapour bubbles in healed cracks, and probably the introduction of external fluids containing high salinity aqueous CaCl_2-rich solutions in nearly pure N_2 vapour bubbles, at lower P- T conditions. This study illustrates that fluid inclusions remain a valuable database of peak metamorphic conditions, moreover, alterations of the entrapped fluids and surrounding crystals are illustrative for specific exhumation evolutions.
机译：来自南部Aravalli山区带（印度）的黑云母-石榴石片岩的流体包裹体提供了有关隆升过程中峰值变质条件和峰后变质过程的信息。仔细的岩石学，显微热计量学和拉曼光谱学的结合揭示了至少五代封闭流体的存在。石榴石轮缘生长的较低的闪石岩相压力-温度条件是由相对最古老的富含CO_2（+-N_2）的包裹体组成的最高流体密度再现的。与石墨缓冲液平衡的，在COH系统中计算出的流体成分对应于变质条件下的富含CO_2的流体。但是，这些计算的结果对氧逸度的微小波动以及矿物平衡的热力学性质的准确性非常敏感。由特定的尺寸密度分布和包含Nacocolite晶体的包裹体中不存在水相所构想的重新平衡，在这些包裹体中被监测为峰后变质过程，例如部分爆破和优先泄漏。其他流体类型包括愈合裂缝中含有CO_2-CH_4.coach气泡的共存含NaCl水溶液的异质流体捕集，以及可能在接近纯N_2气泡中引入含有高盐度CaCl_2水溶液的外部流体。较低的PT条件。这项研究表明，流体包裹体仍然是峰值变质条件的有价值的数据库，此外，截留的流体和周围晶体的变化可以说明特定的掘尸过程。

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