The main tectonic events, depositional history, and the palaeogeography of the southern Urals during the Riphean-early Palaeozoic

Маслов, А. В.; Erdtmann, Bernd-Dietrich; Иванов, К. С.; Ivanov, S.N.; Крупенин, М. Т.

doi:10.1016/s0040-1951(97)00064-4

Cited by 60 publications

(58 citation statements)

References 12 publications

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“…Rb-Sr and K-Ar dates on the intrusions suggest a pre-1.1 Ga age of the lower part of succession (Puchkov, 2010) and acritarchs from the mid to upper parts of the succession extend the age of sedimentation to the midNeoproterozoic (late Riphean, Siedlecka et al, 2004, and references therein). This succession is interpreted to record an initial history of Mesoproterozoic intracratonic extension and riftrelated sedimentation and magmatism (Mezen' Rift and lower Timanide succession) followed by, in the latest Mesoproterozoic to early Neoproterozoic, development of a passive-margin succession containing cratonic-derived siliciclastic sedimentary rocks (Maslov, 2004;Maslov et al, 1997;Maslov and Isherskaya, 2002;Nikishin et al, 1996;Siedlecka et al, 2004). The rifting could be related to the 1385-1380 Ma Mashak igneous event in southern Urals (Puchkov et al, 2013).…”

Section: Northeast Baltica -Timanides and Pre-uralsmentioning

confidence: 99%

Laurentia-Baltica-Amazonia relations during Rodinia assembly

Cawood

Pisarevsky

2017

Precambrian Research

146

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Section: Northeast Baltica -Timanides and Pre-uralsmentioning

confidence: 99%

Laurentia-Baltica-Amazonia relations during Rodinia assembly

Cawood

Pisarevsky

2017

Precambrian Research

146

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“…These groups represent the transgressive cycles of sedimentation, separated from each other by stratigraphic gaps. The basal parts of the cycles are coarse-grained; volcanics are present at the base of the Burzyanian and Yurmatian (see below); the upper parts of the cycles are composed of clay-carbonate rocks [Stratotype of the Riphean…, 1983;Parnachev, 1981;Maslov et al, 1997;Maslov, 2004;Puchkov, 2010].…”

Section: рис 2 схематическая геологическая карта башкирского мегантmentioning

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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“…and Paleoproterozoic crystalline basement of the East European Craton (EEC) (see reviews by Maslov et al, 1997;Scarrow et al, 2002;Maslov, 2004;Bogdanova et al, this volume and references therein) is overlain unconformably by a thick (12-15 km in places), predominantly Mesoproterozoic through Neoproterozoic (Upper Riphean and Vendian) sedimentary succession, best exposed in the region of the Bashkirian anticlinorium (Fig. 4).…”

Section: The Eastern Region Of Baltica: Pre-timanianmentioning

confidence: 99%

“…Comparatively little sedimentation occurred during this early Paleozoic rifting episode. Late Ordovician-Silurian to Devonian passive margin sediments (mainly siliciclastics and limestones) were deposited unconformably above the Mesoproterozoic through Neoproterozoic succession prior to the onset of later Devonian-Carboniferous Uralian convergence (see reviews by Savelieva and Nesbitt, 1996;Maslov et al, 1997;Puchkov, 1997a,b;Maslov, 2004).…”

Section: The Eastern Region Of Baltica: Pre-timanianmentioning

confidence: 99%

“…Unconformably overlying sediments were deposited in alluvial and shallow-marine environments in intra-and pericratonic basins (see reviews of Maslov et al, 1997;Puchkov, 1997a,b;Maslov, 2004). The early Mesoproterozoic sequence represents subalkaline magmatism synchronous with conglomerate deposition, suggesting a rift event.…”

Section: The Eastern Region Of Baltica: Pre-timanianmentioning

confidence: 99%

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