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The First Results of U–Pb Dating of Detrital Zircons from the Oligocene of the Southeastern Part of the Voronezh Anteclise and Their Importance for Paleogeography
Doklady Earth Sciences ( IF 0.9 ) Pub Date : 2020-09-01 , DOI: 10.1134/s1028334x20090044
G. N. Aleksandrova , K. G. Erofeeva , N. B. Kuznetsov , T. V. Romanyuk , V. S. Sheshukov , A. S. Dubensky , S. M. Lyapunov , A. I. Iakovleva , V. N. Pan’kov

The first results of U–Pb (LA–ICP–MS) isotope dating of detrital zircons (dZr) from the Upper Oligocene sands of the Poltava Formation exposed on the southeastern slope of the Voronezh anteclise are presented, providing information on the provenance sources. It is established that the dataset of dZr ages (provenance signal) is characterized by a predominance of ages within the range of 1–2 Ga with a low number of Phanerozoic, Late Proterozoic (younger than 1 Ga), and Archean dates. It is revealed that the cumulative ages of the complexes of the Svecofennian and Sveconorwegian orogens and, to a lesser degree, the Cadomides of Central Europe provide entirely the provenance signal recorded in the sands of the Poltava Formation. The data obtained allow us to refine the paleogeography of the Paratethys northern margin during the Late Oligocene. It has been found that the Poltava Formation was accumulated due to water transport of sediments from intensively eroded structures of western Fennoscandia from the North Sea to the Scythian Sea.

中文翻译:

沃罗涅日前缘东南部渐新世碎屑锆石U-Pb定年初步结果及其对古地理的意义

展示了沃罗涅日前缘东南斜坡暴露的波尔塔瓦组上渐新统砂岩中碎屑锆石 (dZr) 的 U-Pb (LA-ICP-MS) 同位素测年的初步结果,提供了物源信息。已确定 dZr 年龄数据集(来源信号)的特征是年龄在 1-2 Ga 范围内占优势,显生宙、晚元古代(小于 1 Ga)和太古代日期的数量较少。据揭示,Svecofennian 和 Sveconorwegian 造山带复合体的累积年龄,以及在较小程度上,中欧 Cadomides 的累积年龄完全提供了记录在波尔塔瓦地层砂层中的来源信号。获得的数据使我们能够在晚渐新世期间完善 Paratethys 北缘的古地理。
更新日期:2020-09-01
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