The akhmerovo granite massif: A proxy of mesoproterozoic intrusive magmatism in the Southern Urals

Краснобаев, А. А.; Козлов, В. В.; Puchkov, V. N.; Rodionov, N. V.; Nekhorosheva, A. G.; Kiseeva, Ekaterina S.

doi:10.1134/s1028334x08010236

Cited by 18 publications

(5 citation statements)

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“…(2) Figure 3 shows the evolution of zircons from the Akhmerovo massif (Tr) of 1381 ± 23 Ma age (sample K913) [7]. The final stages of the massif evolution con form to the starting ages of zircons in the Mazara gran ites, determining the continuity of granite formation in the Southern Urals.…”

Section: Discussionmentioning

confidence: 99%

Uranium-lead age of zircons from granites and the substrate of the Mazara massif (Southern Urals)

et al. 2015

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The U-Pb dating of zircons from the Mazara granite massif (Southern Urals) by means of the SHRIMP II technique resulted in the conclusion that the zircons were constituted of two key generations belonging, respectively, to the substrate and to the intrusion proper. The age of the granite substrate presented by zircon cores is estimated at 1527-1548 Ma; the final stage of the substrate evolution is characterized by a concordant date of 1388 ± 16 Ma. The latter estimate is much closer to the Mesoproterosoic stage of magma tism. The information on the formation of granites of the Mazara intrusion is mainly contained in the outer parts of the crystals, with two stages distinguished within the formation history. The early and final stages are determined by the datings of 746.6 ± 24.3 and 709.1 ± 5.2 Ma, respectively (both estimates conform to the Neoproterozoic).

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Section: Discussionmentioning

confidence: 99%

Uranium-lead age of zircons from granites and the substrate of the Mazara massif (Southern Urals)

et al. 2015

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“…The SHRIMP-2 zircon age of granites of the Akhmerovo granite massif is 1381 ± 23 Ma [Krasnobaev et al, 2008]. The U-Pb (CA-ID-TIMS) zircon age of metabasalts and rhyolites of the Mashak Fm.…”

Section: Results Chemical Composition and Geochronology Of The Riphementioning

confidence: 99%

The Riphean Magmatism Preceding the Opening of Uralian Paleoocean: Geochemistry, Isotopes, Age, and Geodynamic Implications

Kholodnov¹,

Шардакова²,

Ферштатер³

et al. 2018

Geodin. tektonofiz.

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Abstract: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.Key words: geochemistry; Sr-and Nd-isotopes; dike swarms; Riphean; intra-plate rifting; Urals Аннотация: Урал -одна из немногих структур, в которой сохранились породы всех стадий геодинамической эволюции. Наименее изученным в его геологической истории является период, переходный от континен-тального 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 меган-тиклинория (западный склон Южного Урала), имеющих мезонеопротерозойский возраст. В среднем рифее (1380-1350 млн лет) здесь была сформирована крупная изверженная провинция (LIP) как возможный ре-зультат активности мантийного плюма. Затем (около 1100 млн лет) имел место полный разрыв континен-тальной 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 Восточ-но-Европейской платформы открылось в конце среднего рифея. В венде -кембрии присутствуют признаки орогенных событий (Тиманский этап). С ордовика началось развитие Уральского палеозойского океана, су-ществовавшего до верхнего карбона -ранней перми. GEODYNAMICS & TECTONOPHYSICS P U B L I S H E D B Y T...

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“…The study of the Beloretsk complex continued after that. Krasnobaev et al (2008a) reconsidered the age of the Akhmerovo granite intrusion; it was shown that the age of the intrusion is 1381 ± 23 Ma; it corresponds to the Mashak level. The Pb-Pb single zircon 970 Ma age probably has no geological sense, and therefore the idea that the MCB as an exotic terrane is emplaced along a strike-slip fault does not have enough grounds.…”

Section: Metamorphism: New Data On the Geology Of Hp-lt Complexesmentioning

confidence: 99%

New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

Puchkov¹

2016

Preprint

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Abstract. The period of an official activity of the EUROPROBE commission was inconnected in the Urals with implementation of the URALIDES Program, that stimulated many qualified geologists from the Western research institutes and Universities to come to the region and work with local geologists at actual problems of the Uralian geology. The author tries to answer a question: what interesting results had been obtained in the Southern Urals in the last decade, when the most of foreign researchers left the Urals, and how these results correspond to the scientific conclusions that had been done before.

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The akhmerovo granite massif: A proxy of mesoproterozoic intrusive magmatism in the Southern Urals

Cited by 18 publications

References 3 publications

Uranium-lead age of zircons from granites and the substrate of the Mazara massif (Southern Urals)

Uranium-lead age of zircons from granites and the substrate of the Mazara massif (Southern Urals)

The Riphean Magmatism Preceding the Opening of Uralian Paleoocean: Geochemistry, Isotopes, Age, and Geodynamic Implications

New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

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