gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2026-17-2-0888QGIOJWgtcrust-2243Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSАБАЙСКИЙ МАССИВ СИЕНИТОВ, ВОСТОЧНЫЙ КАЗАХСТАН: ВОЗРАСТ, МОДЕЛЬ ФОРМИРОВАНИЯ И ГЕОДИНАМИЧЕСКОЕ ЗНАЧЕНИЕABAI SYENITE MASSIF, EASTERN KAZAKHSTAN: AGE, FORMATION MODEL AND GEODYNAMIC SIGNIFICANCEhttps://orcid.org/0009-0008-4321-9623ЦареваМ. Д.TsarevaM. D.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

tsarevamd@igm.nsc.ruhttps://orcid.org/0000-0001-5951-0660ХромыхС. В.KhromykhS. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0002-9654-6889КотлерП. Д.KotlerP. D.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0003-4263-5031КуликоваА. В.KulikovaA. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

420008, Казань, ул. Кремлевская, 18 

3 Academician Koptyug Ave, Novosibirsk 630090

18 Kremlyovskaya St, Kazan 420008 

https://orcid.org/0000-0002-8798-377XСеменоваД. В.SemenovaD. V.

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 FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН ; Казанский (Приволжский) федеральный университетРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences ; Kazan Federal UniversityRussian Federation202617042026172888888Copyright © Царева М.Д., Хромых С.В., Котлер П.Д., Куликова А.В., Семенова Д.В., 20262026Царева М.Д., Хромых С.В., Котлер П.Д., Куликова А.В., Семенова Д.В.Tsareva M.D., Khromykh S.V., Kotler P.D., Kulikova A.V., Semenova D.V.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/2243

Проведены исследования щелочных пород массива Абай, расположенного в северо-восточной части Чингиз-Тарбагатайской зоны Восточного Казахстана. Чингиз-Тарбагатайская зона Восточного Казахстана находится в западной части Центрально-Азиатского складчатого пояса, эволюция литосферы которого продолжалась в течение палеозоя и части мезозоя и была сопряжена с закрытием бассейнов в системе Палеоазиатского океана. Массив площадью 9 км2 характеризуется изометричной формой с четко выраженным зонально-концентрическим строением и представляет собой многофазную интрузию, сложенную сиенитами нескольких разновидностей. Преобладающими минералами сиенитов являются калиевый полевой шпат, реже – плагиоклаз, а также моноклинный Na-пироксен (от 5 до 15 об. %) и щелочной амфибол (от 5 до 20 об. %). Значительная часть массива сложена нефелиновыми сиенитами, содержащими до 10–15 об. % нефелина. Акцессорные минералы представлены апатитом, цирконом и ильменитом. Исследования состава минералов и геохимических особенностей пород позволили установить, что сиенитовые породы сформировались при эволюции единой магмы, состав которой мог отвечать щелочным сиенитам или монцонитам. Эта магма, в свою очередь, могла являться результатом дифференциации первичных щелочно-базитовых магм. Датирование зерен магматического циркона (U-Pb метод LA-ICP-MS) позволило впервые надежно установить возраст формирования массива в 401–398 млн лет, что соответствует эмской эпохе раннего девона. Это опровергает ранее существовавшие представления о раннепермском возрасте массива и его внутриплитной геодинамической природе. Сопоставление данных о составе и возрасте массива с данными о геологическом развитии региона позволяет связать формирование сиенитов массива Абай с процессами растяжения, происходившими на фоне субдукции литосферы Джунгаро-Балхашского океана под литосферу Чингиз-Тарбагатайской зоны.

Studies have been made of the Abai alkaline rocks massif, located in the northeastern part of the ChingizTarbagatai zone of Eastern Kazakhstan. The Chingiz-Tarbagatai zone of Eastern Kazakhstan is located in the western part of the Central Asian Orogenic Belt (CAOB), the lithospheric evolution of which continued during the Paleozoic and was associated with the basin closure in the system of the Paleoasian Ocean. The 9 km² massif is characterized by an isometric shape with a clearly defined concentric zonal structure and represents a multiphase intrusion composed of several varieties of syenite. Potassium feldspar is the most prevalent mineral in syenite, while plagioclase, pyroxene (5 to 15 vol. %), and amphibole (5 to 20 vol. %) are less common. Most of the massif is composed of nepheline syenite rocks containing 5–10 vol. % of nepheline. Accessory minerals include apatite, zircon, and ilmenite. Studies of mineral composition and geochemical characteristics of the rocks revealed that the syenites formed during the evolution of a single magma melt composed of alkali-syenite or monzonite. This magma was formed probably as a result of primary alkaline-mafic magma differentiation. The U-Pb LA-ICP-MS dating of magmatic zircon grains for the first time yielded a relibale rock age estimate of 401–398 Ma, which corresponds to the Emsian stage of the Early Devonian. This refutes the previously accepted ideas about the Early Permian age of the massif and its intraplate geodynamic nature. When the data on the composition and age of the massif are compared with the data on the geological evolution of the region, it is apparent that the Abai syenite massif formation is related to the extensional processes in response to subduction of the Junggar-Balkhash oceanic lithosphere underneath the Chingiz-Tarbagatai zone.

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