gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-1-0807ilhqfhgtcrust-1983Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSПЕТРОГЕНЕЗИС ПОСТАККРЕЦИОННЫХ ГРАНИТОВ КИЗИЛЬСКОГО КОМПЛЕКСА ЮЖНОГО УРАЛА: ГЕОХИМИЯ, Sr-Nd ИЗОТОПНЫЕ ДАННЫЕ, U-Pb ВОЗРАСТPETROGENESIS OF POST-ACCRETIONARY GRANITES OF THE KIZIL COMPLEX, SOUTHERN URALS: GEOCHEMISTRY, Sr-Nd ISOTOPIC DATA, U-Pb AGEВасюковаЕ. А.VasyukovaE. A.

630090, Новосибирск, пр-т Академика Коптюга, 3; 630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090; 1 Pirogov St, Novosibirsk 630090

РахимовИ. Р.RakhimovI. R.

450077, Уфа, ул. Карла Маркса, 16/2, Республика Башкортостан

16-2 Karl Marx St, Ufa 450077, Republic of Bashkortostan

Институт геологии и минералогии им. В.С. Соболева СО РАН; Новосибирский государственный университетРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State UniversityRussian FederationИнститут геологии УФИЦ РАНРоссияInstitute of Geology, Ufa Science Center of the Russian Academy of SciencesRussian Federation202519022025161807807Copyright © Васюкова Е.А., Рахимов И.Р., 20252025Васюкова Е.А., Рахимов И.Р.Vasyukova E.A., Rakhimov I.R.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1983

Интрузивный магматизм позднего девона – раннего карбона в Западно-Магнитогорской зоне связывается с постостроводужной перестройкой Южного Урала при сборке суперконтинента Лавразия. Магматические тела обычно имеют субмеридиональную ориентировку, а породы характеризуются пестрым вещественным составом со смешанными геохимическими характеристиками надсубдукционного и внутриплитного магматизма. Незначительная доля магматизма приходится на граниты, самые ранние из которых отвечают кизильскому комплексу, фиксирующему формирование коры континентального типа на базе Магнитогорского островодужного террейна. Установлено, что маломощные дайки и силлы кизильского комплекса развиты в центральной части Западно-Магнитогорской зоны и представлены метасоматизированными гранитами с широкими вариациями глиноземистости (Al2O3 12–18 %), железистости (Fe# 0.7–0.9) и суммы РЗЭ (117–347 г/т). Методом ID TIMS получены четыре U-Pb датировки по циркону, из которых возраст 345±6 млн лет наиболее удовлетворительно согласуется с геологическими данными, остальные датировки могут быть связаны с ассимиляцией вмещающих пород и метасоматозом гранитов. На основе микроэлементного (варьирующиеся минимумы по Eu и Sr, минимумы по Ti, Nb и Ta) и изотопного состава Sr, Nd (εNd(t)=5.9–6.0, 87Sr/86Sr(t)=0.7041–0.7051) сделан вывод о том, что основным источником кизильских гранитоидов могли быть амфиболизированные базиты офиолитовой ассоциации, надвинутые на окраину палеоконтинента Лавруссия по зоне Главного Уральского разлома к западу от Западно-Магнитогорской зоны.

The Late Devonian – Early Carboniferous intrusive magmatism in the West Magnitogorsk zone of the Southern Urals is associated with post-island arc restruction of the earth’s crust during the assembly of the Laurasia supercontinent. Magmatic bodies usually have a submeridional orientation, and the rocks are compositionally variegated and display mixed geochemical characteristics of supra-subduction and intraplate magmatism. A small proportion of magmatism falls within plagiogranites, the earliest of which correspond to the Kizil complex, which records the continental-type crust formation at the base of the Magnitogorsk island-arc terrane. It has been found that thin dikes and sills of the Kizil complex occur widely in the central part of the West Magnitogorsk zone and are represented by metasomatized plagiogranites with wide variations in alumina content (12–18 %), iron content (Fe# 0.7–0.9) and total REE (117–347 ppm). The ID TIMS method yielded four U-Pb zircon ages of which the 345±6 Ma value agrees most satisfactorily with the geological data; other values may be associated with the assimilation of host rocks and metasomatism of granites. Based on the microelement (variable minimums for Eu and Sr, minimums for Ti, Nb and Ta) and isotopic composition of Sr, Nd (εNd(345)=5.9–6.0, 87Sr/86Sr(345)=0.7041–0.7051), it was concluded that that the main source of the Kizil granitoids could be amphibolized mafic rocks of the ophiolite association, thrust onto the margin of the Laurussia paleocontinent along the Main Ural Fault zone to the west of the West Magnitogorsk zone.

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The authors declare that there are no conflicts of interest present.