gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-1-0572gtcrust-1425Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSТЕКТОНИЧЕСКИЕ ОБСТАНОВКИ ОБРАЗОВАНИЯ ВУЛКАНИЧЕСКИХ И ОСАДОЧНЫХ ПОРОД ИТМУРУНДИНСКОЙ ЗОНЫ ЦЕНТРАЛЬНОГО КАЗАХСТАНАTECTONIC SETTINGS OF FORMATION OF VOLCANIC AND SEDIMENTARY ROCKS OF THE ITMURUNDY ZONE, CENTRAL KAZAKHSTANПерфиловаА. А.PerfilovaA. A.

630090, Новосибирск, ул. Пирогова, 1630090, Новосибирск, пр-т Академика Коптюга, 3

Alina A. Perfilova

1 Pirogov St, Novosibirsk 6300903 Academician Koptyug Ave, Novosibirsk 630090

p.alina2808@mail.ruСафоноваИ. Ю.SafonovaI. Yu.

630090, Новосибирск, ул. Пирогова, 1630090, Новосибирск, пр-т Академика Коптюга, 3

1 Pirogov St, Novosibirsk 6300903 Academician Koptyug Ave, Novosibirsk 630090

КотлерП. Д.KotlerP. D.

630090, Новосибирск, ул. Пирогова, 1630090, Новосибирск, пр-т Академика Коптюга, 3

1 Pirogov St, Novosibirsk 6300903 Academician Koptyug Ave, Novosibirsk 630090

СавинскийИ. А.SavinskiyI. A.

630090, Новосибирск, ул. Пирогова, 1

1 Pirogov St, Novosibirsk 630090

ГуроваА. В.GurovaA. V.

630090, Новосибирск, ул. Пирогова, 1630090, Новосибирск, пр-т Академика Коптюга, 3

1 Pirogov St, Novosibirsk 6300903 Academician Koptyug Ave, Novosibirsk 630090

Новосибирский государственный университет; Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияNovosibirsk State University; Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian FederationНовосибирский государственный университетРоссияNovosibirsk State UniversityRussian Federation202222032022131572572Copyright © Перфилова А.А., Сафонова И.Ю., Котлер П.Д., Савинский И.А., Гурова А.В., 20222022Перфилова А.А., Сафонова И.Ю., Котлер П.Д., Савинский И.А., Гурова А.В.Perfilova A.A., Safonova I.Y., Kotler P.D., Savinskiy I.A., Gurova A.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/1425

В статье приведены новые петрографические и геохимические данные для вулканических и осадочных пород, а также первые результаты U-Pb датирования детритовых цирконов из песчаника Итмурундинской зоны Центрального Казахстана. Вулканические породы представлены афировыми и порфировыми базальтами, андезибазальтами и андезитами. По содержанию породообразующих окислов туфы и песчаник близки к андезитовому составу. Слабосортированный песчаник серо-зеленого цвета с большим содержанием обломков вулканических и осадочных пород классифицирован как граувакка, образованная при разрушении пород нерасчлененной островной дуги. Распределение U-Pb возрастов детритовых цирконов (432–505 млн лет) из песчаника имеет унимодальный характер с главным пиком на 445 млн лет. Это предполагает образование песчаника за счет разрушения и последующего сноса материала с внутриокеанической островной дуги позднеордовикского возраста. На геохимических диаграммах точки составов туфов и песчаника расположены рядом с точками вулканических пород. Все спектры распределения концентраций редкоземельных элементов (РЗЭ), нормированных по хондриту, обогащены легкими компонентами (LaN=38–367, La/YbN=4.0–16.9, La/SmN=2.1–3.3) и дифференцированы в области тяжелых (Gd/YbN=1.4–4.0), но уровень концентраций РЗЭ для базальтоидов и туфов выше, чем для песчаника и андезита. На мультиэлементных диаграммах содержаний редких элементов, нормированных к примитивной мантии, часть вулканитов имеют положительные пики по Nb (Nb/Lapm=0.9–1.6, Nb/Thpm=0.8–1.6), а андезит и песчаник – отрицательные (Nb/Lapm=0.25–0.31, Nb/Thpm=0.17). Полученные геохронологические, петрографические и геохимические данные показали, что вулканические и осадочные породы Итмурундинской зоны были образованы во внутриплитных океанических обстановках и надсубдукционных обстановках на конвергентной окраине тихоокеанского типа в ордовикское время.

The paper presents new petrographic and geochemical data from volcanic and sedimentary rocks and first U-Pb ages of detrital zircons from sandstones of the Itmurundy zone of central Kazakhstan. The volcanic rocks are aphyric and porphyric basalts, andesibasalt and andesite. The major element composition of tuff and sandstone are close to that of andesite. The poorly sorted greenish grey sandstones carry numerous fragments of volcanic and sedimentary rocks suggesting its greywacke nature which is probably due to. The greywacke probably formed by the destruction of undissected arc. The distribution of U-Pb ages of detrital zircons spanning 505 to 432 Ma has unimodal character peaked at 445 Ma suggesting formation of the sandstones by the destruction and subsequent transportation of clastic material from a late Ordovician intra-oceanic arc. In geochemical diagrams, the tuffs and sandstone plot close to the volcanic rocks. All chondrite-normalized REE spectra show enrichment in LREE (LaN=38–367, La/YbN=4.0–16.9, La/SmN=2.1–3.3) and moderate to weakly differentiated HREE (Gd/YbN=1.4–4.0). However, the level of REE concentrations in the volcanic rocks, in particular, in basalts, is significantly higher than that in the sandstone and andesite. The primitive mantle normalized trace-element diagrams show peaks at Nb (Nb/Lapm=0.9–1.6, Nb/Thpm=0.8–1.6) in most basaltoids, but troughs at Nb for andesite, tuff and sandstone (Nb/Lapm=0.25–0.31, Nb/Thpm=0.17). The previous and new geochronological, petrographic and geochemical data show that the volcanic and sedimentary rocks of the Itmurundy zone formed in Ordovician time in an intra-plate oceanic setting and in a supra-subduction setting at a Pacific-type convergent margin.

Центрально-Азиатский складчатый поясПалеоазиатский океанордовикранний силуростровная дугаU-Pb датированиегеохимиятектоническая обстановкаCentral Asian Orogenic BeltPaleo-Asian OceanOrdovicianEarly Silurianisland arcU-Pb datinggeochemistrytectonic reconstructionРабота выполнена при поддержке Российского научного фонда (проект № 20-77-10051, И.А. Савинский; проект № 21-77-20022, И.Ю. Сафонова), РФФИ (проект № 20-35-90091, А.А. Перфилова), госзадания Министерства науки и высшего образования РФ (проект № FSUS-2020-0039, НГУ, А.В. Гурова; проект № 0330-2019-0003, ИГМ СО РАН, П.Д. Котлер). Дополнительная поддержка при проведении полевых работ была оказана Министерством науки и образования Казахстана (проект № АР08855920).The study was supported by the Russian Science Foundation (project 20-77-10051, zirconometry; project 21-77-20022, geochemistry), Russian Foundation for Basic Research (project 20-35-90091, petrography), Ministry of Science and Higher Education of the Russian Federation (State Assignment projects FSUS-2020-0039, NSU, petrochemistry; 0330-2019-0003, IGM SB RAS, regional geology) and the Ministry of Science and Education of Kazakhstan (project АР08855920; local geology).ReferencesAlexeiev D.V., Ryazantsev A.V., Kröner A., Tretyakov A.A., Xia X., Liu D.Y., 2011. Geochemical Data and Zircon Ages for Rocks in a High-Pressure Belt of Chu-Yili Mountains, Southern Kazakhstan: Implications for the Earliest Stages of Accretion in Kazakhstan and the Tianshan. 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