gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2019-10-4-0444gtcrust-933Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSРАСШИРЕНИЕ АРЕАЛА ТИМПТОНСКОЙ КРУПНОЙ МАГМАТИЧЕСКОЙ ПРОВИНЦИИ (~1.75 МЛРД ЛЕТ) СИБИРСКОГО КРАТОНАENLARGEMENT OF THE AREA OF THE TIMPTON LARGE IGNEOUS PROVINCE (CA. 1.75 GA) OF THE SIBERIAN CRATONhttps://orcid.org/0000-0001-7227-8253ГладкочубД. П.GladkochubD. P.

докт. геол.-мин. наук, член-корреспондент РАН, директор Института, 664033, Иркутск, ул. Лермонтова, 128;

664033, Иркутск, ул. Лермонтова, 134;

геологический факультет 664003, Иркутск, ул. Ленина, 3

Doctor of Geology and Mineralogy, Corresponding Member of RAS, Director, 128 Lermontov street, Irkutsk 664033;

134 Lermontov street, Irkutsk 664033;

Geological Faculty 3 Lenin street, Irkutsk 664003

dima@crust.irk.ruhttps://orcid.org/0000-0003-1141-0518ДонскаяТ. В.DonskayaT. V.

канд. геол.-мин. наук, в.н.с.,

664033, Иркутск, ул. Лермонтова, 128

Candidate of Geology and Mineralogy, Lead Researcher,

128 Lermontov street, Irkutsk 664033

tanlen@crust.irk.ruhttps://orcid.org/0000-0001-9474-0314ЭрнстР. Е.ErnstR. E.

PhD, н.с. по совместительству, профессор, Отделение наук о Земле, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6;

634050, Томск, пр. Ленина, 36

PhD, Scientist in Residence, Professor, Department of Earth Sciences, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6;

36 Lenin ave., Tomsk 634050

Richard.Ernst@ErnstGeoscsiences.comСедерлундУ.SöderlundU.

PhD, руководитель отдела геологии коренных пород, Отделение геологии,

12 Sölvegatan, SE-223 62 Lund

PhD, Head of Bedrock Geology, Department of Geology,

12 Sölvegatan, SE-223 62 Lund,

ulf.soderlund@geol.lu.seМазукабзовА. М.MazukabzovA. M.

докт. геол.-мин. наук, г.н.с.,

664033, Иркутск, ул. Лермонтова, 128

Doctor of Geology and Mineralogy, Chief Researcher,

128 Lermontov street, Irkutsk 664033

mazuk@crust.irk.ruШохоноваМ. Н.ShokhonovaM. N.

м.н.с.,

664033, Иркутск, ул. Лермонтова, 128

Junior Researcher,

128 Lermontov street, Irkutsk 664033

kyky_kaktyc@mail.ruИнститут земной коры СО РАН, Иркутск Иркутский научный центр СО РАН, Иркутск Иркутский государственный университетРоссияInstitute of the Earth’s Crust, Siberian Branch of RAS; Irkutsk Scientific Center, Siberian Branch of RAS; Irkutsk State UniversityRussian FederationИнститут земной коры СО РАН, ИркутскРоссияInstitute of the Earth’s Crust, Siberian Branch of RASRussian FederationКарлтонский университет; Национальный исследовательский Томский государственный университетКанадаCarleton University; Tomsk State UniversityCanadaЛундский университетШвецияLund UniversitySwedenИнститут земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of RASRussian Federation201909122019104829839Copyright © Гладкочуб Д.П., Донская Т.В., Эрнст Р.Е., Седерлунд У., Мазукабзов А.М., Шохонова М.Н., 20192019Гладкочуб Д.П., Донская Т.В., Эрнст Р.Е., Седерлунд У., Мазукабзов А.М., Шохонова М.Н.Gladkochub D.P., Donskaya T.V., Ernst R.E., Söderlund U., Mazukabzov A.M., Shokhonova M.N.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/933

В статье приводятся результаты геохронологического изучения долеритов чайского дайкового роя Байкальского выступа фундамента Сибирского кратона. Оценка возраста долеритов из юго‐западного окончания чайского дайкового роя U‐Pb методом по бадделеиту показала, что они имеют возраст 1752±6 млн лет, который совпал с оценкой возраста долеритов в северо‐восточном окончании этого роя. На основании полученных результатов был выделен единый чайский дайковый рой протяженностью более 200 км с возрастом 1752 млн лет на территории Байкальского выступа фундамента Сибирского кратона. Новые данные позволили в полном объеме включить чайский дайковый рой совместно с тимптоно‐алгамайским и восточно‐анабарским дайковыми роями в единый радиальный рой Тимптонской крупной магматической провинции позднего палеопротерозоя, центр которой находится в среднем течении р. Вилюй, и, соответственно, расширить ареал данной крупной магматической провинции далее на запад Сибирского кратона.

We present new geochronological data on dolerites from the Chaya dyke swarm of the Baikal inlier of the Siberian craton. The U‐Pb dating of baddeleyite from one dyke located at the SW end of the Chaya dyke swarm yielded an age of 1752±6 Ma, similar to the previously obtained age of a dyke in the NE end of this swarm. These ages estab‐ lish an age of 1752 Ma for a unified Chaya dyke swarm that extends for more than 200 km in the Baikal inlier of the Siberian craton. These new data confirm that the entire Chaya dyke swarm (as well as the Timpton‐Algamay and Eastern Anabar swarms) is a part of an overall radiating dyke swarm belonging to the Late Paleoproterozoic Timpton Large Igneous Province (LIP), the center of which is located in the middle section of the Vilyuy river flow. Thus, the LIP is enlarged to include the area further west in the Siberian craton.

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