Abstract

The first results of U–Pb dating of detrital zircons from two samples that characterize the Tauric and Eski-Orda Series of the Cimmerian structural complex of the Crimean Mountains are presented. The strong similarity between the detrital zircons ages from the Lower Tauric Formation of the Tauric Series and the Salgir sequence of the Eski-Orda Series confirms the facial character of the primary relationships of these series. The studied Upper Triassic sandstones had a common source area and were most likely formed in different parts of the same sedimentary basin. It is most likely that this sedimentary basin was part of the continental margin of Baltica. The presence of a significant number of very ancient detrital zircons (>3.0 Ga, including three oldest detrital zircons grains with ages of ~3.9 Ga) in samples suggests that the crystalline complexes represented in the present-day structure of the Ukrainian Shield had very likely been primary sources of these zircons. Crystalline complexes with such ancient ages are extremely rare over the world, but are widely represented in the Podolian and Azov blocks of the Ukrainian Shield.

中文翻译：

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克里米亚山脉的上三叠纪层序：碎屑锆石U–Pb约会的初步结果

摘要

介绍了两个样品中碎屑锆石的U–Pb测年的初步结果，这些样品表征了克里米亚山脉的Cimmerian结构复合体的Tauric和Eski-Orda系列。来自Tauric系列下Tauric组的碎屑锆石年龄与Eski-Orda系列的Salgir序列之间的强烈相似性证实了这些系列主要关系的面部特征。所研究的上三叠世砂岩有一个共同的烃源区，最有可能在同一沉积盆地的不同部分形成。该沉积盆地很可能是波罗的海大陆边缘的一部分。存在大量非常古老的碎屑锆石（> 3.0 Ga，包括三个最古老的碎屑锆石，年龄约3岁）。样品中的9 Ga）表明，乌克兰盾牌的当今结构中表示的晶体复合物很可能是这些锆石的主要来源。具有如此古老历史的晶体复合物在世界范围内极为罕见，但在乌克兰盾牌的波多利安和亚速夫地块中得到广泛体现。