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首页> 外文期刊>Journal of Geosciences >Magmatic and metamorphic evolution of tourmaline-rich rocks of the Sopron area, Eastern Alps
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Magmatic and metamorphic evolution of tourmaline-rich rocks of the Sopron area, Eastern Alps

机译：东阿尔卑斯山修普伦地区富含电气石的岩浆和变质作用演化

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Tourmaline-rich pegmatitic orthogneisses, tourmalinites, kyanite-chlorite-muscovite schists and quartzites crosscut by subordinate quartz-tourmaline veins and layers were newly described from the Sopron area, Western Hungary. The orthogneisses mainly consist of quartz, plagioclase, tourmaline, garnet and white mica. In smaller amounts K-feldspar, beryl, Mg-rich chlorite, kyanite, lazulite, florencite, monazite and apatite also are present. Magmatic cores and two generations of metamorphic tourmaline (Fe-rich and Mg-rich) were distinguished. Tourmaline in tourmalinites is generally large (several cm), deformed, contains chlorite inclusions and shows oscillatory zoning or polygonal fabric. Large tourmaline crystals often contain dark brown mica-shaped relic areas with higher amount of Ti and Fe than the adjacent parts, interpreted as relics of micas from the protolith. Besides tourmaline, quartz, white mica, plagioclase, apatite, garnet, rutile, ilmenite, scheelite, zircon and monazite are also present in the tourmalinites. Deformed tourmaline-quartz bands and veins occur in kyanite-chlorite-muscovite schists and quartzites. Euhedral, zoned and deformed schorl-dravite, is accompanied with kyanite, Mg-chlorite (leuchtenbergite), rutile muscovite and sillimanite. Narrow colorless tourmaline rims enriched exclusively in Mg (FeO Coarse-grained orthogneisses with a?significant amount of primary tourmaline-beryl assemblage indicates a?fluid-rich, B-Be-bearing environment during the final crystallization of the Variscan peraluminous leucogranite. The formation of tourmalinites can be explained by the related boron metasomatism. Phengitic white mica?rims and calcic garnet rims in orthogneisses and tourmalinites indicate high-pressure Alpine metamorphic overprint. The presence of REE-rich phosphate mineralisation and leuchtenbergite in the orthogneisses imply that high salinity fluids metasomatized the orthogneisses along the pre-existing shear zones after the Alpine metamorphic peak. Tourmaline grains in kyanite-bearing quartzites and schists may have originated from a?micaschist that underwent a?strong Mg-metasomatism during the formation of leucophyllites described from the?area.
机译：从匈牙利西部的修普伦地区新近描述了富含电气石的古生正长片麻岩，电气石，蓝晶石-绿泥石-白云母片岩和被从属石英-电气石脉和层横切的石英岩。直生片麻岩主要由石英，斜长石，电气石，石榴石和白云母组成。还存在少量的钾长石，绿柱石，富含Mg的亚氯酸盐，蓝晶石，方沸石，氟钙石，独居石和磷灰石。区分了岩浆岩芯和两代变质碧玺（富铁和富镁）。电气石中的电气石通常较大（几厘米），变形，含有绿泥石夹杂物，并显示出振荡带或多边形织物。大型电气石晶体通常包含深褐色的云母状遗迹区域，其中的Ti和Fe含量要比邻近部分高，这被解释为来自原石的云母遗迹。除电气石之外，石英，白云母，斜长石，磷灰石，石榴石，金红石，钛铁矿，白钨矿，锆石和独居石也存在于电气石中。变形的电气石石英带和脉发生在蓝晶石-绿泥石-白云母片岩和石英岩中。 Euhedral呈带状和片状的方片状方晶石，并伴有蓝晶石，Mg-亚氯酸盐（白矾石），金红石白云母和硅线石。狭窄的无色电气石轮辋，仅富含Mg（FeO粗粒正条麻岩，具有大量的初级电气石-绿柱石组合，表明在Variscan过铝白云石的最终结晶过程中，该流体富含B-Be。可能由相关的硼交代作用解释了原硅藻岩中的变质白云母边缘和钙质石榴石边缘，以及原硅藻土中的钙镁石榴石边缘显示出高压的阿尔卑斯山变质套印;在原矿中存在富含稀土元素的磷酸盐矿化和白矾石，意味着高盐度流体高山变质峰后沿原有剪切带交织成正长片麻岩，含蓝晶石的石英岩和片岩中的电气石晶粒可能来自于云母片岩中，该岩粒在从该区域描述的叶蜡石形成过程中经历了强烈的Mg-变质作用。 。

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