Interaction between amphibole and H2O–HCl fluid was experimentally studied in an internally heated pressure vessel (IHPV) at 650–800°C and 5–7 kbar. The stability of the anorthite–amphibole association was approved to be constrained at T = 650–800°C, (P = 5–7 kbar) within a range of HCl fugacity (fHCl) 50 < fHCl < 400 bar. At higher fHCl, the amphibole is replaced by gedrite (or cordierite at 800°C) + chlorite. Concentrations of major components in the equilibrium solutions were measured. It is demonstrated that Ca and Fe are more significantly than Mg removed from the amphibole, whereas Al and Si weakly pass into the fluid phase and mostly form an aluminosilicate matrix consisting of small spherical and clastic quartz grains, phases like Al2SiOn × mH2O, and fibrous sillimanite. The aluminosilicate matrix locally hosts large (>100 µm) corundum and quartz crystals. Based on experimental data, it is demonstrated that interaction between metabasite with acidified fluid resulted in Ca, Fe, and no so much Mg removal from the metabasite (as inferred for rocks cropping out on Kii Island in the White Sea). The HCl fugacity in the metasomatizing fluid was approximately 50–200 bar at T = 650 – 800°C, P = 5–7 kbar. Rock depletion in bases led to that the residual matrix enriched in Al2O3 and SiO2, and this was favorable for the origin of corundum, on the one hand, and highly silicic rocks, like quartzite, on the other.

中文翻译：

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在 650-750°C、5-7 Kbar 条件下角闪石与 H2O-HCl 流体相互作用的实验研究：对变基石高温交代作用的影响

在 650-800°C 和 5-7 kbar 的内部加热压力容器 (IHPV) 中，实验研究了闪石和 H2O-HCl 流体之间的相互作用。钙长石-角闪石组合的稳定性被批准限制在 T = 650–800°C，（P = 5–7 kbar）在 HCl 逸度 (fHCl) 50 < fHCl < 400 bar 的范围内。在较高的 fHCl 中，闪石被 gerite（或 800°C 的堇青石）+ 绿泥石取代。测量平衡溶液中主要组分的浓度。结果表明，从闪石中去除的 Ca 和 Fe 比 Mg 更显着，而 Al 和 Si 微弱地进入流体相，主要形成由小的球形和碎屑石英颗粒、Al2SiOn × mH2O 等相和纤维状相组成的铝硅酸盐基质。硅线石。铝硅酸盐基质局部承载大 (> 100 µm) 刚玉和石英晶体。根据实验数据，表明变碱金属岩与酸化流体之间的相互作用导致了钙、铁，并且没有从变碱金属岩中去除太多的镁（如白海纪伊岛出土的岩石所推断的那样）。在 T = 650 – 800°C，P = 5–7 kbar 时，交代流体中的 HCl 逸度约为 50–200 bar。基岩耗竭导致残余基质富集Al2O3和SiO2，一方面有利于刚玉的成因，另一方面有利于石英岩等高硅质岩石的成因。在 T = 650 – 800°C，P = 5–7 kbar 时，交代流体中的 HCl 逸度约为 50–200 bar。基岩耗竭导致残余基质富集Al2O3和SiO2，一方面有利于刚玉的成因，另一方面有利于石英岩等高硅质岩石的成因。在 T = 650 – 800°C，P = 5–7 kbar 时，交代流体中的 HCl 逸度约为 50–200 bar。基岩耗竭导致残余基质富集Al2O3和SiO2，一方面有利于刚玉的成因，另一方面有利于石英岩等高硅质岩石的成因。