The Rb–Sr Age of Authigenic Glauconite and U–Pb Age of Detrital Zircons from Riphean and Vendian Deposits of the Mezen Syneclise, East European Platform (Keltmen-1 Borehole)

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-09-04 DOI:10.1134/s1028334x24603419

T. S. Zaitseva, E. Yu. Golubkova, A. B. Kuznetsov, N. B. Kuznetsov, T. V. Romanyuk, E. G. Dovzhikova, O. K. Kaurova

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Abstract

The Rb–Sr age of glauconite and the U–Pb LA-ICP-MS age of detrital zircons from sandstones of the Riphean Okos Formation and the Vendian Ust-Pinega Formation were determined in the Keltmen-1 parametric borehole, drilled in the Vychegda trough of the Mezen syneclise in the northern part of European Russia. The model Rb–Sr age of glauconite (870–820 Ma) and the U–Pb age of the youngest detrital zircon (1005 ± 14 Ma) limit the time of accumulation of the Okos Formation to the first half of the Late Riphean, which is in good agreement with the biostratigraphic data available. The U–Pb age of the youngest detrital zircon from the lower part of the Ust-Pinega Formation suggests that accumulation of Late Vendian sandstones into the Mezen Basin began about 575 Ma. Thus, the duration of the stratigraphic hiatus between the Riphean and Vendian is estimated to be about 250–300 Ma. In the Late Riphean and Late Vendian, the Mezen basin was filled with terrigenous material of Archean–Late Proterozoic age (from 3.25 to 1.02 Ga), the sources of which were rocks of the Baltic Shield. In the lower part of the Ust-Pinega Formation, a population of detrital zircon of Vendian age (730–575 Ma) was discovered, a possible source of which could have been rocks of the Proto-Ural–Timan Orogen.

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东欧地台（凯尔门-1 号钻孔）梅津系（Mezen Syneclise）芮贝安和文登系矿床自生褐铁矿的 Rb-Sr 年龄和锆英石的 U-Pb 年龄

摘要在俄罗斯欧洲北部梅津同系的维切格达槽钻探的凯尔门-1号参数钻孔中，测定了里氏奥科斯地层和文登乌斯特-皮涅加地层砂岩中琉璃岩的Rb-Sr年龄和碎屑锆石的U-Pb LA-ICP-MS年龄。白云母的 Rb-Sr 年龄模型（870-820Ma）和最年轻的锆英石的 U-Pb 年龄（1005 ± 14Ma）将奥科斯地层的堆积时间限定在晚里皮世的前半期，这与现有的生物地层数据十分吻合。乌斯特-皮涅加地层下部最年轻的锆英石碎片的 U-Pb 年龄表明，晚文迭纪砂岩在梅津盆地的堆积始于大约 575 Ma。因此，Riphean 和 Vendian 之间的地层间断时间估计约为 250-300 Ma。在Riphean晚期和Vendian晚期，Mezen盆地被Archean-Late Proterozoic时代（3.25-1.02 Ga）的陆相物质填充，这些物质的来源是波罗的海地盾的岩石。在乌斯特-皮涅加地层下部，发现了一批文迪纪（730-575Ma）的碎屑锆石，其来源可能是原乌拉尔-提曼造山带的岩石。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.