The first results of U-Pb dating of zircons from gneissic granites of the Kharbei Complex (Polar Urals)

Голубева, И. И.

doi:10.1134/s1028334x11080022

Cited by 3 publications

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“…О перерыве в осадконакоплении между двумя циклами, начавшемся, вероятно, еще в конце раннего кембрия и продолжавшемся весь средний кембрий, свидетельствует отсутствие отложений этого возраста и находки реликтов и вещества кембрийских кор выветривания в основании комплекса уралид [Yudovich et al, 1998[Yudovich et al, , 2006Kozyreva, Nikulova, 2012 , 2013b;Miller et al, 2018]; 2 -риолитов пожемского комплекса (Є 3 -O 1 ), р. Б. Тыкотлова [Soboleva et al, 2008a] Map…, 2013b]; 5 -диоритов кызыгейского комплекса (V 2 ), г. Борзова [State Geological Map…, 2013b]; 6, 7гнейсовидных гранитов (6 -V, 7 -Є 3 -O 1 ) Харбейского блока [Golubeva, 2011]; 8 -гранитов Сядатаяхинского массива (Є 1 ) [Andreichev et al, 2007]; 9 -гранитов Гердизского массива (Є 3 ) [Shuysky et al, 2018a]; 10 -гранитов блока Марункеу (Є 3 ) [Kulikova et al, 2012]. Серым цветом залиты точки, исключенные из рассмотрения.…”

Section: Fig 14unclassified

“…[State Geological Map…, 2013b]; 4 -rhyolites of the Khoydyshor formation (Є 3 -O 1 ) from the Malaya Usa River [State Geological Map…, 2013b]; 5 -diorites of the Kyzygey complex (V 2 ) from the Borzov Mt. [State Geological Map…, 2013b]; 6, 7 -gneissic granites (6 -V, 7 -Є 3 -O 1 ) of the Kharbey block [Golubeva, 2011]; 8 -granites of the Syadatayakha massif (Є 1 ) [Andreichev et al, 2007]; 9 -granites of the Gerdiz massif (Є 3 ) [Shuysky et al, 2018a]; 10granites of the Marunkeu block (Є 3 ) [Kulikova et al, 2012]. Gray-filled points are excluded from consideration.…”

Section: Fig 14mentioning

confidence: 99%

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Boundary Between the Timanian and Uralian Tectonic Cycles: Results of Dating of Detrital Zircons From Basal Horizons of the Lower Paleozoic Synrift Complex of the Polar Urals, and Igneous Rock Age Data Report

Soboleva,

Nikulova,

Khubanov

2024

Geodin. tektonofiz.

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The Upper Cambrian-Lower Ordovician terrigenous strata, unconformably overlying the Upper Riphean-Vendian rocks of the Timanide orogen in the north of the Urals, and contemporaneous bimodal volcanics and intrusive rocks are considered complexes marking the beginning of rifting which led to the opening of the Paleo-Ural Ocean later on. The article presents the results of U-Pb (LA-ICP-MS) dating of detrital zircons from sandstones lying at the base of the section of the rift complex in the Malaya Usa River basin in the Polar Urals. It was found that the clastic sequence (identified as the Khoydyshor formation) began to accumulate no earlier than the Cambrian–Ordovician transition. Zircon ages fall within the continuous Vendian to Early Ordovician (575–478 Ma) interval with peak at 512 Ma. This age range overlaps with the age of rhyolites interlayered conformably with sandstones and rhyolite porphyry dikes intruding the Khoydyshor formation, thus indicating a possible admixture of products of synsedimentary volcanism. A narrow zircon age pattern allows us to conclude that the main sources of detrital zircons in sandstones were the Early-Middle Cambrian igneous rocks formed at the stage of pre-rift uplift, and, to a lesser extent, the Late Cambrian-Early Ordovician riftogenic magmatic complexes, marking the beginning of the Uralian tectonic cycle, as well as the Late Vendian igneous rocks of the underlying Timanide orogen. Judging by the Th/U ratio, most of the detrital zircons within the sandstones were derived from the Early Paleozoic silicic volcanic and hypabyssal rocks and the Vendian granitoids and diorites. The almost complete absence of older grains, which are typical of coeval sandstones of the northern part of the Urals, may indicate the accumulation of the considered sandstones in a local trough with local clastic material sources. Probability density estimation of U-Pb ages for zircon from igneous and metamorphic rocks of the Polar Urals indicates that there were no gaps in the Late Riphean to Early Ordovician endogenous activity in this region. The main peaks occur at 552, 521 and 500 Ma, and an additional peak – at 665 Ma. The results of dating of detrital zircons from sandstones of the Khoydyshor formation together with the database of U-Pb isotope ages of igneous and metamorphic rocks of the Polar Urals (119 items), compiled by the authors, indicate that the change in geodynamic regime from collisional orogenesis in the Late Vendian to the Early-Middle Cambrian pre-rift uplift and following Late Cambrian rifting was not accompanied by a longterm discontinuity in magmatic activity.

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confidence: 99%

Boundary Between the Timanian and Uralian Tectonic Cycles: Results of Dating of Detrital Zircons From Basal Horizons of the Lower Paleozoic Synrift Complex of the Polar Urals, and Igneous Rock Age Data Report

Soboleva,

Nikulova,

Khubanov

2024

Geodin. tektonofiz.

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The U–Pb LA-SF-ICP-MS Age of Zircon from Metaplagiogranite of the Kharbei Metamorphic Complex (Polar Urals)

Ulyasheva

Хубанов

2022

Dokl. Earth Sc.

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GRANITOID MAGMATISM IN THE NORTH OF THE URALS: U–Pb AGE, EVOLUTION, SOURCES

Удоратина

Куликова

Шуйский

et al. 2021

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This work presents the summarization of U–Pb (SIMS, TIMS) zircon dates and petrogeochemical signatures of granitoids of the north of the Urals (Polar, Subpolar, and Northern Urals) obtained over the last decade. Granitе melts were formed from melting of different substrates, highly heterogeneous in composition and age, at all geodynamic stages distinguished in the studied area. Preuralides include island arc–accretionary (735–720 Ma, 670 Ma), collisional (650–520 Ma), and rift-related (520–480 Ma) granitoids. Uralides includes primitive island-arc granitoids (460–429 Ma), mature island-arc granitoids (412–368 Ma), early collisional (360–316 Ma) and late collisional (277–249 Ma) granitoids. As a result, the general trend of variations of oxygen (δ18OZrn, ‰), neodymium (εNd(t)wr), and hafnium (εHf(t)Zrn) isotope compositions identified in time. Mantle isotope compositions (δ18OZrn (+5.6), εNd(t)wr (+1.7), εHf(t)Zrn (+8.7...+10.6)), common for island arc granitoids (Preuralides) are changed by crustal–mantle ones (δ18OZrn (+7.2...+8.5), εNd(t)wr (–4.8...+1.8), εHf(t)Zrn (+2.1 to +13)), typical of collisional granites. According to this, the crustal matter played a significant role during the formation of the latter. The crustal-mantle isotope compositions are changed by the mantle ones, characteristic of rift-related (δ18OZrn (+4.7...+7), εNd(t)wr (+0.7...+5.6), εHf(t)Zrn (–2.04...+12.5)) and island-arc (Uralides; δ18OZrn (+4.2...+5.7), εNd(t)wr (+4.1...+7.4), εHf(t)Zrn (+12...+15.2)) granitoids.

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The first results of U-Pb dating of zircons from gneissic granites of the Kharbei Complex (Polar Urals)

Cited by 3 publications

References 0 publications

Boundary Between the Timanian and Uralian Tectonic Cycles: Results of Dating of Detrital Zircons From Basal Horizons of the Lower Paleozoic Synrift Complex of the Polar Urals, and Igneous Rock Age Data Report

Boundary Between the Timanian and Uralian Tectonic Cycles: Results of Dating of Detrital Zircons From Basal Horizons of the Lower Paleozoic Synrift Complex of the Polar Urals, and Igneous Rock Age Data Report

The U–Pb LA-SF-ICP-MS Age of Zircon from Metaplagiogranite of the Kharbei Metamorphic Complex (Polar Urals)

GRANITOID MAGMATISM IN THE NORTH OF THE URALS: U–Pb AGE, EVOLUTION, SOURCES

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