gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2018-9-2-0351gtcrust-578Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSРИФЕЙСКИЙ МАГМАТИЗМ, ПРЕДШЕСТВУЮЩИЙ РАСКРЫТИЮ УРАЛЬСКОГО ПАЛЕООКЕАНА: ГЕОХИМИЯ, ИЗОТОПИЯ, ВОЗРАСТ, ГЕОДИНАМИЧЕСКИЕ СЛЕДСТВИЯTHE RIPHEAN MAGMATISM PRECEDING THE OPENING OF URALIAN PALEOOCEAN: GEOCHEMISTRY, ISOTOPES, AGE, AND GEODYNAMIC IMPLICATIONSХолодновВ. В.KholodnovV. V.

докт. геол.-мин. наук, профессор, зав. лабораторией,

620016, Екатеринбург, ул. Академика Вонсовского, 15

Doctor of Geology and Mineralogy, Professor, Head of Laboratory,

15 Akademik Vonsovsky street, Yekaterinburg 620016

holodnov@igg.uran.ruШардаковаГ. Ю.ShardakovaG. Yu.

канд. геол.-мин. наук, в.н.с., ул. Академика Вонсовского, 15;

620144, Екатеринбург, ул. Куйбышева, 30,

shardakovagalina@mail.ru

Candidate of Geology and Mineralogy, Lead Researcher,

15 Akademik Vonsovsky street, Yekaterinburg 620016;

30 Kuibysheva street, Yekaterinburg 620144

shardakova@igg.uran.ruФерштатерГ. Б.FershtaterG. B.

докт. геол.-мин. наук, профессор, г.н.с.,

620016, Екатеринбург, ул. Академика Вонсовского, 15

Doctor of Geology and Mineralogy, Professor, Chief Researcher,

15 Akademik Vonsovsky street, Yekaterinburg 620016

fershtater@igg.uran.ruШагаловЕ. С.ShagalovE. S.

канд. геол.-мин. наук, с.н.с.,

620016, Екатеринбург, ул. Академика Вонсовского, 15;

620144, Екатеринбург, ул. Куйбышева, 30

Candidate of Geology and Mineralogy, Senior Researcher,

15 Akademik Vonsovsky street, Yekaterinburg 620016;

30 Kuibysheva street, Yekaterinburg 620144

shagalov@igg.uran.ruИнститут геологии и геохимии им. акад. А.Н. Заварицкого УрО РАНРоссияA.N. Zavaritsky Institute of Geology and Geochemistry, Ural Branch of RASRussian FederationИнститут геологии и геохимии им. акад. А.Н. Заварицкого УрО РАН; Уральский государственный горный университетРоссияA.N. Zavaritsky Institute of Geology and Geochemistry, Ural Branch of RAS; Ural State Mining UniversityRussian Federation20180207201892365389Copyright © Холоднов В.В., Шардакова Г.Ю., Ферштатер Г.Б., Шагалов Е.С., 20182018Холоднов В.В., Шардакова Г.Ю., Ферштатер Г.Б., Шагалов Е.С.Kholodnov V.V., Shardakova G.Y., Fershtater G.B., Shagalov E.S.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/578

Урал – одна из немногих структур, в которой сохранились породы всех стадий геодинамической эволюции. Наименее изученным в его геологической истории является период, переходный от континентального рифтинга к океаническому спредингу. В статье представлены новые данные по геохимии, изотопии Sr и Nd, U-Pb (SHRIMP) возрасту цирконов магматических пород и связанных с ними руд Башкирского мегантиклинория (западный склон Южного Урала), имеющих мезонеопротерозойский возраст. В среднем рифее (1380–1350 млн лет) здесь была сформирована крупная изверженная провинция (LIP) как возможный результат активности мантийного плюма. Затем (около 1100 млн лет) имел место полный разрыв континентальной коры, и краткое время существовала рифтовая структура (Назямский грабен). Для магматических пород с возрастом 1750–1100 млн лет фиксируется геохимическая эволюция составов: OIB →E-MORB→ N-MORB. При этом εNd изменяется от отрицательных (–6) до положительных значений (+5), указывая на обеднение литосферной мантии со временем. Эти факты, наряду с поведением изотопов Sr для пород всех последующих стадий эволюции Урала, указывают на то, что океаническое пространство к востоку от Восточно-Европейской платформы открылось в конце среднего рифея. В венде – кембрии присутствуют признаки орогенных событий (Тиманский этап). С ордовика началось развитие Уральского палеозойского океана, существовавшего до верхнего карбона – ранней перми.

The rocks from different stages of the geodynamic evolution have been preserved in the Urals. In its geologic history, the least studied is the transition period between continental rifting and the beginning of oceanic spreading. This article presents the geochemical data on the Sr-, Nd-isotopes, zircon U-Pb (SHRIMP) ages for the MesoNeoproterozoic igneous rocks and associated ores from the Bashkir meganticlinorium (BMA) on the Urals western slope. A Large Igneous Province (LIP) formed there as a result of mantle plume activity during the Middle Riphean (1380–1350 Ma). Later on (1200–1100 Ma), short-term rifting took place, as evidenced by the Nazyam graben, which was followed by the complete break-up of the continental crust. For magmatic rocks in the age range of 1750–1200 Ma, the evolition of chemical composition OIB-type → E-MORB →N-MORB is observed. The εNd(t) values for the igneous rocks and the associated BMA ores vary from negative (–6) to positive ones (+5), and thus give evidence of the lithosphere mantle depletion with time. These facts and the Sr-isotope ratios for the magmatic rocks from the subsequent evolution stages confirm that the oceanic basin to the east of the East European platform started to open at the end of the Middle Riphean. For the Vendian-Cambrian, some traces of orogenes (Timanian stage) are observed. The development of the Uralian Paleozoic ocean started in the Ordovican and continued up to the Late CarboniferousPermian.

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