Bashkirian Sr-Nd age of the terminal stage of collisional magmatism in the Western Magnitogorsk zone of the South Urals

Рахимов, И. Р.; Salikhov, D. N.; Пучков, В. Н.; Ronkin, Yu. L.; Kholodnov, V. V.

doi:10.1134/s1028334x14080078

Cited by 2 publications

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“…Изотопно-геохимические данные по породам серии подтверждают влияние плюм-литосферного взаимодействия: ( 87 Sr/ 86 Sr) i= 0.70313, εNd(t) +5.90…+5.80 [Ronkin, 1989;Gorozhanin, 1995], указывая на то, что рифтогенез и грабенообразование в ЦМП вызвали деструкцию коры с насыщением ее деплетированным материалом мантии. Наличие элементов расслоенности, а также петрогеохимические параметры позволяют рассматривать кристаллизационную дифференциацию как ведущий механизм формирования магнитогорской серии [Fershtater, 2013]: от габбро к габбро-диоритам, диоритам и далее -к адамеллитам и гранитам растут содержания Nb и Y при Y/Nb=5 (рис.…”

Section: позднепалеозойский постостроводужный гранитоидный магматизм магнитогорской мегазоныunclassified

“…Nd-изотопная систематика позднепалеозойских гранитоидов Урала (фрагмент рисунка из работы [Kholodnov et al, 2017], с дополнениями). При построении полей использованы также данные следующих авторов [Ronkin, 1989;Orogenic Granitoid Magmatism..., 1994;Shatagin et al, 2000;Popov et al, 2002;Osipova et al, 2008;Tevelev et al, 2006Tevelev et al, , 2015Fershtater, 2013;Smirnov et al, 2014aSmirnov et al, , 2014bRonkin et al, 2016;Shardakova, 2016aShardakova, , 2016bKrasnobaev et al, 2017;Petrov, 2017Petrov, , 2020Kholodnov et al, 2020;и др.]. Поле I -массивы офиолитовых и островодужных ассоциаций Урала; поле II -окраинно-континентальные гранитоидные массивы (поздний девон -карбон); поле III -гранитоиды, образующиеся при гиперколлизии континентов (пермь) (степнинская, джабыкско-санарская и мурзинско-адуйская серии).…”

Section: пермский коллизионный и постколлизионный гранитный магматизмunclassified

“…), представлены рядом от монцогаббро и монцодиоритов до граносиенитов, субщелочных гранитов, лейкогранитов с жилами пегматитов и аплитов. Они внедрялись дискретно начиная с 286 млн лет и далее в течение верхней перми [Ronkin, 1989;Bushlyakov, Bajenov, 1999;Smirnov, Kaleganov, 2001;Fershtater, 2013;Snachev et al, 2018;Puchkov, 2018a] Особенности состава подтверждают плюм-зависимую природу пермских монцодиорит-гранитных серий [Puchkov, 2018a]. На начальном этапе внедрялись глубинные основные и средние мантийные магмы, их можно считать производными отдельного плюма: на диаграммах ( 87 Sr/ 86 Sr) i -εNd(t) и V-Ti/1000 (г/т) они лежат в поле OIB.…”

Section: пермский коллизионный и постколлизионный гранитный магматизмunclassified

“…The Nd-isotope systematics of the Late Paleozoic granitoids of the Urals (a fragment of the figure from[Kholodnov et al, 2017], with additional data). For constructing the fields, we also used the data from[Ronkin, 1989; Orogenic Granitoid Magmatism..., 1994;Shatagin et al, 2000;Popov et al, 2002;Osipova et al, 2008;Tevelev et al, 2006Tevelev et al, , 2015Fershtater, 2013;Smirnov et al, 2014aSmirnov et al, , 2014bRonkin et al, 2016;Shardakova, 2016aShardakova, , 2016bKrasnobaev et al, 2017;Petrov, 2017Petrov, , 2020Kholodnov et al, 2020] and other publications. Field I -massifs of ophiolite and island-arc associations of the Urals; field II -Late Devonian -Carboniferous marginalcontinental granitoid massifs; field III -granitoids resulting from the Permian continental collision (Stepninsky, Dzhabyk-Sanar, and Murzin-Adui series).…”

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Paleozoic Granitoid Magmatism of the Urals: The Reflection of the Stages of the Geodynamic and Geochemical Evolution of a Collisional Orogen

Kholodnov

Шардакова

Puchkov

et al. 2021

Geodin. tektonofiz.

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The Ural mobile belt is an intracontinental epioceanic orogen that has already gone through all stages of the geodynamic development. Igneous rocks formed during each stage are important indicators for understanding the evolution of this belt and determining potential ore contents of its segments. We consolidated large datasets on petrogeochemistry and isotope geochronology of the Paleozoic (490–250 Ma) granitoids associated with the opening and evolution of the Ural paleoocean and the subsequent formation of the collisional orogen. Using these data, we have revised the ages of several tectono-magmatic events, clarified the paleogeodynamic settings for the generation of granitoids of different compositions, and described the roles of mantle-crust interactions and the plume factor in the formation of the mature continental crust in the study area. The results can be useful for geological mapping and improving the assessment of the potential ore contents in granitoid complexes that differ in origin and composition.

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Section: позднепалеозойский постостроводужный гранитоидный магматизм магнитогорской мегазоныunclassified

Section: пермский коллизионный и постколлизионный гранитный магматизмunclassified

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Paleozoic Granitoid Magmatism of the Urals: The Reflection of the Stages of the Geodynamic and Geochemical Evolution of a Collisional Orogen

Kholodnov

Шардакова

Puchkov

et al. 2021

Geodin. tektonofiz.

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Subduction, collision and plumes in the epoch of the Late Paleozoic magmatism of the Magnitogorsk zone (the Southern Urals)

et al. 2019

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Subject. A systematization of Late-Paleozoic magmatic formations of the Magnitogorsk zone of the Southern Urals in the process of an accretion of the Magnitogorsk paleoarc to the margin of the East European continent (EEC) with formation in Famenian and Carboniferous active continent margin of South-Uralian accretionary-collisional belt was given in the work. Materials and methods. A generalization of published and manuscript materials characterizing magmatism and ore-mineralization of Magnitogorsk zone for the Devonian-Carboniferous-Permian time carried out, additional investigations of chemical composition of rocks (XRF, ISP-MS) characterizing process of accretion, subduction and plume activity, microelement distribution in them was made, the composition of rock-forming and accessory minerals (EPMA) was studied. Results. It is found that the South-Uralian accretionary-collisional belt was beginning to form in the late phase of the development of the Magnitogorsk island arc in the process its collision with EEC margin with formation in the Frasnian and Carboniferous of active continental margin. The products of Late-island-arc volcanism are represented by the porphyrite formation and in the eastern frame of the arc - by subalkaline monzonite-shoshonite-latite volcanic-intrusive association with intermediate characteristics between the subductional and interplate formations. Synchronously with them, in the backarc setting, picrite and meymechite volcanics − derivatives of a mantle plume are formed. In process of substitution of tectonic-magmatic regime from island-arc to margin-continental intraplate-type mantle series were forming. During this period, hot asthenospheric diapirs (plumes) were rising to the bottom of new-formed (accreted) margin-continental lithosphere. Along with the magmatic associations of intraplate type and rock series of intermediate geochemical type, this geodynamic situation in the Southern Urals is characterized by a presence of great volumes of mantle-crust granitoids of gabbro-tonalite-granodiorite-granite type, that were formed with a manifold manifestation of anatexis in a time interval of 365-290 Ma. Conclusion. On the whole the originality of Magnitogorsk zone geological history in the Devonian and Carboniferous, peculiarities of magmatic complexes formed here due to various geodynamic settings, are making this zone an extraordinary interesting and important object to study of processes of plume-lithosheric and mantle-crust interaction.

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Bashkirian Sr-Nd age of the terminal stage of collisional magmatism in the Western Magnitogorsk zone of the South Urals

Cited by 2 publications

References 1 publication

Paleozoic Granitoid Magmatism of the Urals: The Reflection of the Stages of the Geodynamic and Geochemical Evolution of a Collisional Orogen

Paleozoic Granitoid Magmatism of the Urals: The Reflection of the Stages of the Geodynamic and Geochemical Evolution of a Collisional Orogen

Subduction, collision and plumes in the epoch of the Late Paleozoic magmatism of the Magnitogorsk zone (the Southern Urals)

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