The Nature of the Puchezh–Katunki Impact Structure (the Central Part of the East European Platform): Results of the U‒Th‒Pb Isotope System Study of Detrital Zircons from Explosive Breccias

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geotectonics Pub Date : 2024-01-08 DOI:10.1134/s0016852123050047

S. Yu. Kolodyazhny, N. B. Kuznetsov, T. V. Romanyuk, A. V. Strashko, E. A. Shalaeva, A. S. Novikova, A. S. Dubenskiy, K. G. Erofeeva, V. S. Sheshukov

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Abstract

The Puchezh–Katunki crater is located in the central part of the East European Platform in the area of the Gorky Reservoir, has a diameter of ~80 km, and is morphologically expressed by the central uplift of the basement (Vorotilov knoll) and the ring depression surrounding it, on the periphery of which there is a ring terrace. The crater is filled with various coptogenic (explosive (?)) formations: breccias of various types and bodies of suevites and tagamites. The results of studying the U‒Th‒Pb isotope system of detrital zircon grains from variegated explosive Puchezh breccias in the northwestern part of the ring terrace (three samples) are presented. The weighted average of the three youngest U‒Pb dates of detrital zircons from all studied samples is 258 ± 7 Ma, which corresponds to the Late Permian. We take this date as the lower age limit of the Puchezh breccias. The age sets of detrital zircon grains from the studied samples and from (1) crystalline rocks of the Vorotilov knoll and suevites of the ring depression and (2) Upper Permian–Lower Triassic sandstones of the Zhukov Ravine reference section (Moscow Syneclise) were compared. The absence of zircon grains, whose U‒Th‒Pb isotope system is similar to the parameters of those from the rocks of the Vorotilov knoll and suevites among the detrital zircons from the Puchezh breccia indicates the local nature of the Puchezh–Katunki explosion, the impact-thermal impact of which did not affect the detrital zircons in rocks of the marginal part of the ring terrace of the crater. A high degree of similarity of the age sets of detrital zircon grains from the lens of redeposited sandstones of the Puchezh breccias and Upper Permian rocks of the Zhukov Ravine section indicates that the Puchezh breccias were formed mainly due to the reworking of the Upper Permian–Lower Triassic sequences underlying the explosive formations. We consider the Uralian paleo-orogenic belt as the main provenance area for the deposits of the central regions of the East European Platform in the stratigraphic interval close to the Permian–Triassic boundary. The deposits were formed as a result of a high degree of mixing and averaging of clastic material of sedimentary flows containing the Uralian and Asha provenance signals.

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普切日-卡通基撞击结构（东欧地台中部）的性质：爆炸碎屑岩中的碎屑锆石的 U-Th-Pb 同位素系统研究结果

摘要普切日-卡通基陨石坑位于东欧地台中部的高尔基水库地区，直径约为 80 千米，形态上表现为基底中央隆起（沃罗季洛夫丘）及其周围的环形凹陷，其外围是环形阶地。陨石坑中布满了各种共生（爆炸（？）地层：各种类型的角砾岩以及燧石和榍石。本文介绍了对环形阶地西北部不同类型的普切日爆炸性角砾岩（三个样本）中的锆石碎片的 U-Th-Pb 同位素系统的研究结果。所有研究样品中最年轻的三个碎片锆石 U-Pb 年代的加权平均值为 258 ± 7 Ma，相当于二叠纪晚期。我们将这一日期作为普切日角砾岩的年龄下限。我们比较了所研究样本中的锆石颗粒与（1）沃罗季洛夫山丘的结晶岩和环状凹陷的沸石以及（2）茹科夫峡谷参照剖面（莫斯科同步剖面）上二叠世-下三叠世砂岩中的锆石颗粒的年龄组。在普切日角砾岩的碎屑锆石中不存在 U-Th-Pb 同位素系统与沃罗季洛夫山丘岩石和绢云母中的锆石参数相似的锆石颗粒，这表明普切日-卡通基爆炸是局部性的，其撞击-热冲击没有影响到陨石坑环形阶地边缘部分岩石中的碎屑锆石。普切日砾岩重新沉积砂岩透镜中的锆石颗粒与茹科夫峡谷段上二叠统岩石中的锆石颗粒的年龄组高度相似，这表明普切日砾岩主要是由于爆炸地层下的上二叠统-下三叠统序列的再加工而形成的。我们认为，乌拉尔古成因带是东欧地台中部地区接近二叠纪-三叠纪界线地层区间沉积物的主要产地。这些沉积物的形成是含有乌拉尔和阿斯哈来源信号的沉积流碎屑物质高度混合和平均化的结果。

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来源期刊

Geotectonics 地学-地球化学与地球物理

CiteScore

1.90

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.