gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-4-0707gtcrust-1715Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSКЕНГЕДИНСКИЙ МАФИЧЕСКИЙ ДАЙКОВЫЙ РОЙ И РАСШИРЕНИЕ КУОНАМСКОЙ КРУПНОЙ ИЗВЕРЖЕННОЙ ПРОВИНЦИИ (1500 МЛН ЛЕТ) СЕВЕРНОЙ СИБИРИKENGEDE MAFIC DYKE SWARM AND EXPANSION OF THE 1.50 Ga KUONAMKA LARGE IGNEOUS PROVINCE OF NORTHERN SIBERIAhttps://orcid.org/0000-0001-5865-7521ТомшинМ. Д.TomshinM. D.

677000, Якутск, пр-т Ленина, 39

39 Lenin Ave, Yakutsk 677000

https://orcid.org/0000-0001-9474-0314ЭрнстР. Е.ErnstR. E.

KIS 5B6, Оттава, Онтарио

634050, Томск, пр-т Ленина, 36

Ottawa K1S 5B6, Ontario

36 Lenin Ave, Tomsk 634050

СёдерлундУ.SöderlundU.

223 62, Лунд

Lund 223 62

https://orcid.org/0000-0002-1248-8993ОкругинА. В.OkruginA. V.

677000, Якутск, пр-т Ленина, 39

39 Lenin Ave, Yakutsk 677000

okrugin@diamond.ysn.ruИнститут геологии алмазов и благородных металлов СО РАНРоссияDiamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of SciencesRussian FederationКарлтонский университет; Томский государственный университетРоссияCarleton University; National Research Tomsk State UniversityRussian FederationЛундский университетШвецияLund UniversitySweden202316082023144707707Copyright © Томшин М.Д., Эрнст Р.Е., Сёдерлунд У., Округин А.В., 20232023Томшин М.Д., Эрнст Р.Е., Сёдерлунд У., Округин А.В.Tomshin M.D., Ernst R.E., Söderlund U., Okrugin 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/1715

В пределах Анабарского щита в северной части Сибирского кратона широко распространены позднедокембрийские базиты, которые формируют разновозрастные дайковые рои различного направления. В статье приводятся новые данные по составу, строению и U-Pb датировкам даек Кенгединского роя. Три новых возраста по бадделеиту (1496±7, 1494±3 и 1494±5 млн лет) из трех даек указывают на то, что Кенгединский рой даек является частью Куонамской крупной магматической провинции (КМП). Ранее выделенная Куонамская КМП простирается на 700 км от Анабарского щита до Оленекского поднятия в северной части Сибирской платформы и потенциально связана с синхронными дайками и силлами кратонов Сан-Франциско и Конго. Вновь датированный Кенгединский рой расположен параллельно в 50 км южнее от Куонамского роя даек (1501±3 млн лет), и идентификация этих двух самостоятельных субпараллельных дайковых роев Куонамской КМП подтверждает более раннюю интерпретацию того, что центр мантийного плюма располагался вдоль экстраполированного тренда даек вблизи восточной или западной окраины Сибирского кратона. В связи с этим в статье также рассматриваются особенности сульфидной Cu-Ni-минерализации в долеритах Кенгединского и Восточно- Анабарского дайковых роев и обсуждается потенциальное Cu-Ni-сульфидное оруденение, связанное с разновозрастными докембрийскими роями мафических даек на северо-востоке Сибирской платформы.

Within the Anabar shield in the northern part of the Siberia, Late Precambrian mafic igneous units are widespread, which form dyke swarms of different ages of different trends. This paper presents new data on the composition, structure and U-Pb dating of the E-W trending Kengede dyke swarm. Three new U-Pb ID-TIMS baddeleyite ages (1496±7, 1494±3 and 1494±5 Ma) were obtained from three dykes, indicating that the Kengede swarm is part of the 1500 Ma Kuonamka large igneous province (LIP). The previously recognized Kuonamka Large Igneous Province (LIP) extends for 700 km from the Anabar shield to the Olenek uplift in the northern part of the Siberia and is potentially linked to coeval dykes and sills of the São Francisco craton and the Congo craton. The newly dated Kengede swarm is parallel to but offset by 50 km from the previously dated 1501±3 Ma Kuonamka swarm, and the identification of these two subparallel dyke subswarms of the Kuonamka LIP supports the earlier interpretation that mantle plume centre was located along the extrapolated trend of the dykes near the eastern or western margin of the Siberia. The paper examines features of sulfide Cu-Ni mineralization in dolerites of the Kengede and East Anabar dyke swarms and discusses potential Cu-Ni-sulfide mineralization linked to the Precambrian mafic dyke swarms of different ages in the north-east of the Siberia.

базитыдайковый ройкрупные изверженные провинцииплюмАнабарский щитСибирский кратонbasitedike swarmlarge igneous provinceplumeAnabar shieldSiberian cratonГеолого-петрологический раздел работы выполнен в рамках НИР ИГАБМ СО РАН (№ 0381-2019-0003) и проекта LIPS-Industry Consortium (www.supercontinent.org), а раздел о Cu-Ni-сульфидной минерализации – по теме проекта РНФ (региональный конкурс) № 22-27-20151.The authors appreciate the efforts of their colleagues who took part in field and laboratory research, and are also grateful to the reviewers A.S. Mekhonoshin and A.К. Khudoley for valuable comments that helped in improvement of the article. Geological and petrological section of the work was carried out within the framework of the DPMGI SB RAS (0381-2019-0003) and the LIPs-Industry Consortium project (www.supercontinent.org), section on Cu-Ni-sulfide mineralization was carried out within the framework of the Russian Science Foundation project (Regional contest) 22-27-20151.ReferencesBaragar W.R.A., Ernst R.E., Hulbert L., Peterson T., 1996. Longitudinal Petrochemical Variation in the Mackenzie Dyke Swarm, Northwestern Canadian Shield. Journal of Petrology 37 (2), 317–359. https://doi.org/10.1093/petrology/37.2.317.Baragar W.R.A., Ernst R.E., Hulbert L., Peterson T., 1996. Longitudinal Petrochemical Variation in the Mackenzie Dyke Swarm, Northwestern Canadian Shield. Journal of Petrology 37 (2), 317–359. https://doi.org/10.1093/petrology/37.2.317.Blanchard J.A., Ernst R.E., Samson C., 2017. 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