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Surface microtextures and new U–Pb dating of detrital zircons from the Eocene Strihovce sandstones in the Magura Nappe of the External Western Carpathians: implications for their provenance
International Journal of Earth Sciences ( IF 2.3 ) Pub Date : 2020-04-13 , DOI: 10.1007/s00531-020-01859-z
Katarína Bónová , Magdalena Pańczyk , Ján Bóna

Heavy mineral morphological, chemical and isotopic features are strong discriminative parameters in provenance studies. This paper focuses on the micro-textural signatures of detrital zircon grains obtained by scanning electron microscope (SEM) and U–Pb geochronological dating from the Strihovce Formation sandstones of the Magura Nappe in the External Western Carpathians. Our focus provides an important contribution to understanding the provenance of these sedimentary rocks. Although the SEM images reveal few dissolution features, they highlight many marks of mechanical processes which occur during detrital zircon transport. The detrital zircon U–Pb ages range from Mesoarchean–Neoproterozoic through Cambrian to Permian and Late Cretaceous. The pronounced peak at approximately 480 Ma Ordovician indicates the culmination of the peri-Gondwanan magmatic event. In conjunction with Archean to Proterozoic zircon inheritance, it implies Cadomian affinity of the potential source terranes which supplied the Magura Basin. The approximate ages of 379 Ma for the Late Devonian peak and 264 Ma for the Permian relate to widespread magmatism and/or rhyolite volcanism. These sources could be associated with the Carpathian basement units and the Apuseni terranes of the Tisza/Dacia mega-units. Most importantly, the sub-hedral Proterozoic zircons may signal the input of ‘first-cycle’ material from relatively closer surroundings, including the South-Magura Ridge to the Magura Basin.



中文翻译:

西部喀尔巴阡山脉Magura新生代始新世Strihovce砂岩碎屑锆石的表面微观结构和新的U–Pb年代:对其物源的影响

在物源研究中,重矿物的形态,化学和同位素特征是很强的判别参数。本文重点介绍了通过扫描电子显微镜(SEM)和U-Pb年代学年代从西喀尔巴阡山脉外Magura纳普的Strihovce组砂岩获得的碎屑锆石晶粒的微观结构特征。我们的重点为理解这些沉积岩的起源提供了重要的贡献。尽管SEM图像显示出很少的溶解特征,但它们突出了碎屑锆石运输过程中发生的许多机械过程标记。碎屑锆石的U-Pb年龄范围从中古统-新元古代到寒武纪再到二叠纪和晚白垩世。约480 Ma奥陶纪的明显峰值表明冈多瓦南周岩浆事件的顶点。结合太古宙对元古代锆石的继承,它暗示了为马古拉盆地提供能源的潜在地层的卡多夫亲和力。泥盆纪晚期高峰的年龄约为379 Ma,二叠纪为264 Ma,与广泛的岩浆作用和/或流纹岩火山作用有关。这些来源可能与Tisza / Dacia大型单位的喀尔巴阡地下室单位和Apuseni地形有关。最重要的是,亚前元古代锆石可能会发出信号,表明从相对较近的环境(包括南马古拉山脊到马古拉盆地)输入了“第一周期”物质。它暗示了提供给马古拉盆地的潜在源地的卡多夫亲和力。泥盆纪晚期高峰的年龄约为379 Ma,二叠纪为264 Ma,与广泛的岩浆作用和/或流纹岩火山作用有关。这些来源可能与Tisza / Dacia大型单位的喀尔巴阡地下室单位和Apuseni地形有关。最重要的是,亚前元古代锆石可能会发出信号,表明从相对较近的环境(包括南马古拉山脊到马古拉盆地)输入了“第一周期”物质。它暗示了提供给马古拉盆地的潜在源地的卡多夫亲和力。泥盆纪晚期高峰的年龄约为379 Ma,二叠纪为264 Ma,与广泛的岩浆作用和/或流纹岩火山作用有关。这些来源可能与Tisza / Dacia大型单位的喀尔巴阡地下室单位和Apuseni地形有关。最重要的是,亚前元古代锆石可能会发出信号,表明从相对较近的环境(包括南马古拉山脊到马古拉盆地)输入了“第一周期”物质。这些来源可能与Tisza / Dacia大型单位的喀尔巴阡地下室单位和Apuseni地形有关。最重要的是,亚前元古代锆石可能会发出信号,表明从相对较近的环境(包括南马古拉山脊到马古拉盆地)输入了“第一周期”物质。这些来源可能与Tisza / Dacia大型单位的喀尔巴阡地下室单位和Apuseni地形有关。最重要的是,亚前元古代锆石可能会发出信号,表明从相对较近的环境(包括南马古拉山脊到马古拉盆地)输入了“第一周期”物质。

更新日期:2020-04-21
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