Abstract
Research subject. The article presents the results of dating two dolerite dikes differing in geochemical features from a section along the Iset river in the area of Smolinskoe settlement (the Eastern zone of the Middle Urals). Materials and methods. The dating was performed by an U-Pb ID-TIMS technique for single zircon grains using an artificial 205Pb/235U tracer in the laboratory of geochronology and isotope geochemistry of the Geological Institute of the Kola Science Centre of the Russian Academy of Sciences. The lead isotopic composition and uranium and lead concentrations were measured using a Finnigan-MAT (RPQ) seven-channel mass spectrometer in dynamic mode using a secondary electron multiplier and RPQ quadrupole in ion counting mode. Results. The dikes were dated 330 ± 3 Ma and 240 ± 2 Ma. Conclusions. The research results indicate different ages of dolerite dikes developed within the Eastern zone of the Middle Urals. The oldest of the two established age levels corresponds to the Early Carboniferous era. This fact, along with the proximity of the dolerites to the petrochemical features of the basaltoids of the Early Carboniferous Beklenischevsky volcanic complex, allows these bodies to be considered as hypabyssal comagmates of these volcanics. The youngest obtained age level – Triassic – indicates that the introduction of some dolerite dikes was associated with the final phases of the trapp formation developed rarely within the eastern outskirts of the Urals and widely further east in the foundation (pre-Jurassic basement) of the West-Siberian Plate.
Highlights
The article presents the results of dating two dolerite dikes differing in geochemical features from a section along the Iset river in the area of Smolinskoe settlement
The dating was performed by an U-Pb ID-TIMS technique for single zircon grains using an artificial 205Pb/235U tra cer in the laboratory of geochronology and isotope geochemistry of the Geological Institute of the Kola Science Centre of the Russian Academy of Sciences
The research results indicate different ages of dolerite dikes developed within the Eastern zone of the Middle Urals
Summary
В качестве объекта датирования выбраны две существенно различающиеся по геохимическим особенностям дайки из наиболее представительного разреза по р. Проба См-1 отобрана из скального обнажения долеритов Смолинский Камень, расположенного на левом берегу р. Исеть в 600 м ниже южной окраины того же села Долериты изученных проб близки по составу и структурно-текстурным особенностям. 1. Схема расположения участка отбора проб для изотопного датирования долеритов. Более подробно характер залегания датированных даек и петрографические особенности слагающих их долеритов детально описаны в опубликованной ранее работе (Дианова и др., 1975). 2. Скальный выход долеритов Смолинский Камень, место отбора пробы См-1. 3): спектры РЗЭ для долеритов пробы См-1 характеризуются преобладанием тяжелых лантаноидов ((La/Yb)n = 0.69), в долеритах пробы См-2 наблюдаются обратная картина, т. Наличие столь кардинальных различий в составе долеритов позволяет с достаточной степенью уверенности предполагать, что их внедрение было связано с разными эпизодами магматической активности
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