Peraluminous orthogneisses represent a typical rock type of the Monotonous and Varied units of the Moldanubian Zone. The most probable setting for the generation of these rocks is the Cambro-Ordovician magmatic event linked to crustal anataxis, which is related to the thermal relaxation of thickened continental crust. According to their geological position, the mineralogy and geochemistry can be traced to the Blaník and Deštná type orthogneisses. The Blaník type is represented by muscovite-biotite to muscovite-tourmaline orthogneisses whose granitic protolith can be generated by muscovite-dominant dehydration melting of metapelites. The chemical heterogeneity of this type suggests magma differentiation, which is manifested by the presence of P-Li-Sn-Nb mineralization. Muscovite-biotite to biotite Deštná type orthogneisses were likely generated by the fluid-present melting of immature crustal sources (e.g. metagreywackes and metaigneous rocks) and spatially related to small occurrences of W-bearing mineralization. We applied whole-rock geochemistry combined with mineralogy and zircon U-Pb geochronology to the evolutionary interpretation of one of the most fractionated bodies of Deštná type orthogneisses situated near the village of Pacov. The Pacov orthogneiss is accompanied by pre-Variscan greisens and related tungsten mineralization (ferberite, scheelite, pyrite, and native bismuth). The mineral assemblages of these rock types are modified by the Variscan metamorphic overprint (720 ± 75 °C at 0.65 ± 0.29 GPa). Two petrographically distinct samples of orthogneisses give U–Pb zircon ages of 494 ± 2 Ma (garnet-muscovite orthogneiss) and 485 ± 4 Ma (muscovite-biotite orthogneiss). The abundance of inherited pre-magmatic zircon cores (∼614–578 Ma) most likely documents detrital protoliths derived from erosion of the Ediacaran volcanic arc.

中文翻译：

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Pacov 体正片麻岩的年代学和岩石成因：对摩尔达努比亚带（波西米亚地块）的单调多变单元中寒武纪-奥陶纪过铝质岩浆作用和相关矿化作用的细分的影响

过铝质正片麻岩代表了摩尔多瑙带单调多变单元的典型岩石类型。形成这些岩石的最可能背景是与地壳转折相关的寒武纪-奥陶纪岩浆事件，这与加厚的大陆地壳的热弛豫有关。根据它们的地质位置，矿物学和地球化学可以追溯到 Blaník 和 Deštná 型正片麻岩。Blaník 型以白云母-黑云母到白云母-电气石正片麻岩为代表，其花岗质原岩可以通过变泥质岩以白云母为主的脱水熔融产生。这种类型的化学异质性表明岩浆分异，这表现为 P-Li-Sn-Nb 矿化的存在。白云母-黑云母到黑云母 Deštná 型正片麻岩很可能是由未成熟地壳源（例如变灰岩和变火成岩）的流体熔融熔融产生的，并且在空间上与少量的含 W 矿化有关。我们将全岩地球化学与矿物学和锆石 U-Pb 年代学相结合，对位于 Pacov 村附近的 Deštná 型正片麻岩的最细碎体之一进行演化解释。Pacov 正片麻岩伴随着 Variscan 前的 greisens 和相关的钨矿化（铁镁矿、白钨矿、黄铁矿和天然铋）。这些岩石类型的矿物组合被 Variscan 变质叠印 (720 ± 75 °C at 0.65 ± 0.29 GPa) 修饰。两个岩相学上不同的正方麻岩样品的 U-Pb 锆石年龄分别为 494 ± 2 Ma（石榴石-白云母正片麻岩）和 485 ± 4 Ma（白云母-黑云母正片麻岩）。大量继承的前岩浆锆石核（614-578 Ma）很可能记录了来自埃迪卡拉纪火山弧侵蚀的碎屑原岩。