gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2024-15-3-0760VDLNWDgtcrust-1849Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSДАЙКОВЫЕ КОМПЛЕКСЫ ВОСТОЧНОЙ ЧАСТИ КААХЕМСКОГО МАГМАТИЧЕСКОГО АРЕАЛА (ВОСТОЧНАЯ ТУВА): СОСТАВ, ВОЗРАСТ, ГЕОЛОГИЧЕСКАЯ ПОЗИЦИЯDike Complexes in the Eastern Part of the Kaakhem Magmatic Area (Eastern Tuva): Composition, Age, Geological PositionЯковлевВ. А.YakovlevV. A.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

yakovlevva@igm.nsc.ruКармышеваИ. В.KarmyshevaI. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

РудневС. Н.RudnevS. N.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

СеменоваД. В.SemenovaD. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ЮдинД. С.YudinD. S.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian Federation202418062024153760760Copyright © Яковлев В.А., Кармышева И.В., Руднев С.Н., Семенова Д.В., Юдин Д.С., 20242024Яковлев В.А., Кармышева И.В., Руднев С.Н., Семенова Д.В., Юдин Д.С.Yakovlev V.A., Karmysheva I.V., Rudnev S.N., Semenova D.V., Yudin D.S.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/1849

В статье приведены результаты изотопно-геохронологических и петрологических исследований пород габброидных и комбинированных диорит-гранитных даек, расположенных в восточной части Каахемского ареала. Обе группы даек прорывают разновозрастные диорит-тоналит-плагиогранитные ассоциации (489±5 и 476±4 млн лет). Цирконы из гранитоидов минглинг даек имеют возраст 477±3 млн лет (LA-ICP-MS). Возраст габброидных даек определен LA-ICP-MS (циркон) и Ar-Ar (амфибол) методами и составляет 454±10 и 450±6.3 млн лет соответственно. Близкие содержания петрогенных и редких элементов основных и средних пород даек указывают на их образование из единого источника, имеющего субдукционные характеристики. Салические породы комбинированных даек различаются по составу и близки неоднородным диорит-тоналит-плагиогранит-гранитным ассоциациям вмещающих пород. Формирование дайковых комплексов протекало на коллизионном этапе развития Каахемского магматического ареала и связано с развитием локальных зон растяжения.

This paper presents the results of isotope-geochronological and petrological studies of gabbroic and combined diorite-granite dikes located in the eastern part of the Kaakhem magmatic area. Both groups of dikes cut through diorite-tonalite-plagiogranite associations of different ages (489±5 and 476±4 Ma). Zircons from granitoid of mingling dikes have an age of 477±3 Ma (LA-ICP-MS). The age of the gabbroic dikes was determined by LA-ICP-MS (zircon) and Ar-Ar (amphibole) methods and is 454±10 and 450±6.3 Ma, respectively. Similar contents of major and trace elements in basic and intermediate rocks of dikes indicate their formation from a single source with subduction characteristics. The salic rocks of the combined dikes vary in composition and are close to the heterogeneous diorite-tonalite-plagiogranite-granite associations of the host rocks. The formation of dike complexes occurred at the collisional stage of development of the Kaakhem magmatic area and is associated with the development of local extension zones.

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