Fluid inclusions (FIs) and associated solids in host minerals garnet, tourmaline, spodumene, and quartz from six pegmatite fields of Permian origin at Koralpe (Eastern Alps) have been investigated. Although pegmatites suffered intense Eoalpine high-pressure metamorphic overprint during the Cretaceous period, the studied samples originate from rock sections with well-preserved Permian magmatic textures. Magmatic low-saline aqueous FIs in garnet domains entrapped as part of an unmixed fluid together with primary N₂-bearing FIs that originate from a host rock-derived CO₂-N₂ dominated high-grade metamorphic fluid. This CO₂-N₂ fluid is entrapped as primary FIs in garnet, tourmaline, and quartz. During host mineral crystallization, fluid mixing between the magmatic and the metamorphic fluid at the solvus formed CO₂-N₂-H₂O–rich FIs of various compositional degrees that are preserved as pseudo-secondary inclusions in tourmaline, quartz, and as primary inclusions in spodumene. Intense fluid modification processes by in-situ host mineral–fluid reactions formed a high amount of crystal-rich inclusions in spodumene but also in garnet. The distribution of different types of FIs enables a chronology of pegmatite host mineral growth (garnet-tourmaline/quartz-spodumene) and their fluid chemistry is considered as having exsolved from the pegmatite parent melt together with the metamorphic fluid from the pegmatite host rocks. Minimum conditions for pegmatite crystallization of ca. 4.5–5.5 kbar at 650–750 °C have been constrained by primary FIs in tourmaline that, unlike to FIs in garnet, quartz, and spodumene, have not been affected by post-entrapment modifications. Late high-saline aqueous FIs, only preserved in the recrystallized quartz matrix, are related to a post-pegmatite stage during Cretaceous Eoalpine metamorphism.

中文翻译：

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来自 Koralpe（奥地利）的二叠纪伟晶岩宿主矿物中的流体和固体包裹体：解读伟晶岩形成过程中二叠纪流体的演化

已经研究了来自 Koralpe（东阿尔卑斯山）二叠纪起源的六个伟晶岩油田的寄主矿物石榴石、电气石、锂辉石和石英中的流体包裹体 (FI) 和相关固体。尽管伟晶岩在白垩纪遭受了强烈的初高山高压变质叠印，但所研究的样品来自具有保存完好的二叠纪岩浆结构的岩石剖面。石榴石域中的岩浆低盐度含水 FIs 作为未混合流体的一部分与原生含 N _{2 的}FIs一起被捕获，这些FIs 源自主岩衍生的 CO ₂ -N ₂主导的高品位变质流体。该 CO ₂ -N ₂流体在石榴石、电气石和石英中作为主要 FI 被捕获。在宿主矿物结晶过程中，岩浆与变质流体在溶质处混合形成CO ₂ -N ₂ -H ₂各种组成程度的富氧 FI，在电气石、石英中作为伪次生包裹体保存，在锂辉石中作为主要包裹体保存。通过原位主体矿物-流体反应进行的剧烈流体改性过程在锂辉石和石榴石中形成了大量富含晶体的包裹体。不同类型 FI 的分布使得伟晶岩寄主矿物生长（石榴石-电气石/石英-锂辉石）的年代学成为可能，并且它们的流体化学被认为是从伟晶岩母体熔体中与伟晶岩寄主岩中的变质流体一起溶出的。伟晶岩结晶的最低条件。650–750 °C 下的 4.5–5.5 kbar 受到电气石中初级 FI 的限制，与石榴石、石英和锂辉石中的 FI 不同，电气石中的 FI 不受捕获后修饰的影响。