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Central European Variscan Basement in the Outer Carpathians: A Case Study from the Magura Nappe, Outer Western Carpathians, Poland
Minerals ( IF 2.5 ) Pub Date : 2021-02-28 , DOI: 10.3390/min11030256
Aleksandra Gawęda , Krzysztof Szopa , Jan Golonka , David Chew , Anna Waśkowska

Exotic crystalline blocks within the Outer Carpathian flysch have the potential to establish the nature of their eroded basement source(s) and thus to reconstruct the paleogeography of the Outer Carpathians. Petrological investigations (including mineral analyses) coupled with zircon and apatite U-Pb dating were performed on an exotic crystalline block within Eocene siliciclastic rocks in the Rača Zone of the Magura Nappe in the Outer Western Carpathians, Poland. This exotic block is a large (c. 1 m diameter) pink porphyritic granitoid block found in the Osielczyk Stream, southeast of Osielec village in the Makowski Beskid mountains. The timing of magmatic crystallization is constrained by a U-Pb zircon age of 315.9 ± 2.6 Ma (MSWD = 0.69), while inherited zircon cores yield Archean (c. 2780 Ma), Cadomian (541.8 ± 6.7 Ma; MSWD = 0.53), Devonian (417 ± 11 Ma; MSWD = 0.57) and Early Variscan (c. 374 Ma) ages. Apatites from the same sample yield a Tera Wasserburg lower intercept U-Pb age of 311.3 ± 7.5 (MSWD = 0.87). The granitoid exhibits geochemical characteristics typical of I-type granites and eNd(316 Ma) = 2.15 (with a TDM model age of 1.18 Ga) and 87Sr/86Sr(316 Ma) = 0.704710. These data suggest a likely source region in the Saxo-Danubian Granite Belt, which possibly formed the basement of the Fore-Magura Ridge.

中文翻译:

外喀尔巴阡山脉的中欧瓦里斯坎地下室:以波兰西部喀尔巴阡山脉的马古拉纳皮为例

外喀尔巴阡山脉复飞石中的外来晶体块有可能建立其侵蚀的基底源的性质,从而重建外喀尔巴阡山脉的古地理。岩石学研究(包括矿物分析)与锆石和磷灰石U-Pb定年相结合,是在波兰西部喀尔巴阡山脉Magura Nappe的Rača地区始新世硅质碎屑岩中的一个奇异晶体块上进行的。这个奇异的地块是一个大型(直径约1 m)的粉红色斑状花岗岩类块体,位于马基夫斯基贝斯基德山区奥西莱克村东南部的奥西莱奇溪流中。岩浆结晶的时间受U-Pb锆石年龄315.9±2.6 Ma(MSWD = 0.69)的限制,而继承的锆石岩心则产生了太古代(c。2780 Ma),卡多马族(541.8±6.7 Ma; MSWD = 0.53),泥盆纪(417±11 Ma; MSWD = 0.57)和瓦里斯坎早期(c。374 Ma)年龄。来自同一样品的磷灰石产生的Tera Wasserburg较低的U-Pb截距年龄为311.3±7.5(MSWD = 0.87)。花岗岩具有I型花岗岩和eNd典型的地球化学特征(316 Ma) = 2.15(T DM模型年龄为1.18 Ga)和87 Sr / 86 Sr (316 Ma) = 0.704710。这些数据表明萨克斯-达努比亚花岗岩带中可能有一个源区,这可能形成了前马古拉山脊的基底。
更新日期:2021-02-28
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