KENGEDE MAFIC DYKE SWARM AND EXPANSION OF THE 1.50 Ga KUONAMKA LARGE IGNEOUS PROVINCE OF NORTHERN SIBERIA

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 ne...

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Bibliographic Details
Published in:IEEE Transactions on Sustainable Energy
Main Authors: M. D. Tomshin, R. E. Ernst, U. Söderlund, A. V. Okrugin, М. Д. Томшин, Р. Е. Эрнст, У. Сёдерлунд, А. В. Округин
Other Authors: 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., Авторы благодарны своим коллегам, принимавшим участие в полевых и лабораторных исследованиях, а также признательны рецензентам А.С. Мехоношину и А.К. Худолею за конструктивные замечания, которые позволили улучшить статью. Геолого-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.
Format: Article in Journal/Newspaper
Language:Russian
English
Published: Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch 2023
Subjects:
Online Access:https://www.gt-crust.ru/jour/article/view/1715
https://doi.org/10.5800/GT-2023-14-4-0707
Description
Summary: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. 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 ...