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首页> 外文期刊>Contributions to Mineralogy and Petrology >Multistage Variscan magmatism in the central Tauern Window (Austria) unveiled by U/Pb SHRIMP zircon data
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Multistage Variscan magmatism in the central Tauern Window (Austria) unveiled by U/Pb SHRIMP zircon data

机译:U / Pb SHRIMP锆石数据揭示了位于陶恩窗(奥地利)中央的多级Variscan岩浆作用

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摘要

U/Pb SHRIMP ages of nine Variscan leucocratic orthogneisses from the central Tauern Window (Austria) reveal three distinct pulses of magmatism in Early Carboniferous (Visean), Late Carboniferous (Stephanian) and Early Permian, each involving granitoid intrusions and a contemporaneous opening of volcano-sedimentary basins. A similar relationship has been reported for the Carboniferous parts of the basement of the Alps further to the west, e.g. the "External massifs" in Switzerland. After the intrusion of subduction-related, volcanic-arc granitoids (374 +- 10 Ma; Zwolterkogel gneiss), collisional intrusive-granitic, anatectic and extrusive-rhyolitic/dacitic rocks were produced over a short interval at ca. 340 Ma (Augengneiss of Felbertauern: 340+- 4 Ma, HochweiBenfeld gneiss: 342 +- 5 Ma, Falkenbachlappen gneiss: 343+- 6 Ma). This Early Carboniferous magmatism, which produced relatively small volumes of melt, can be attributed to the amalgamation of the Gondwana-derived "Tauern Window" terrane with Laurussia-
机译:来自陶恩窗中部(奥地利)的9个瓦里斯坎白垩纪正斜岩的U / Pb SHRIMP年龄揭示了早石炭纪(维森),石炭纪晚期(斯蒂芬尼时代)和早二叠纪的三个岩浆脉动,每个脉动都涉及花岗岩侵入和火山同时开放沉积盆地。据报道,在更西边的阿尔卑斯山地下室的石炭纪部分也有类似的关系。瑞士的“外部地块”。与俯冲有关的火山弧花岗岩(374±10 Ma; Zwolterkogel片麻岩)侵入后,在短短的间隔内(大约)产生了碰撞侵入花岗岩,南极和挤压流纹岩/大胶质岩。 340 Ma(Felbertauern的Augengneiss:340 +-4 Ma,HochweiBenfeld片麻岩:342 +-5 Ma,Falkenbachlappen片麻岩:343 +-6 Ma)。这种早期石炭纪的岩浆作用产生的熔体量相对较小,可以归因于冈瓦纳派生的“陶恩窗”地层与月桂属的合并。

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