A Reconstruction of a Vendian–Cambrian Active Continental Margin within the Southern Urals: Results of Detrital Zircons Studying from Ordovician Terrigenous Rocks

Ryazantsev, A. V.; Кузнецов, Н. Б.; Degtyarev, K. E.; Romanyuk, T. V.; Tolmacheva, T. Yu.; Белоусова, Е. А.

doi:10.1134/s0016852119040058

Cited by 14 publications

(10 citation statements)

References 26 publications

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“…1). Образования, слагающие в основном Восточно-Уральскую мегазону современного Урала, интерпретируют как фрагменты древних островодужных сооружений [Puchkov, 2000[Puchkov, , 2010Ryazantsev et al, 2008]. Реликты окраинных комплексов Аркт-Лавруссии, «доуральскую» природу которых затушевала Уральская орогения, участвуют в строении Западно-Уральской мегазоны.…”

Section: палеотектонические реконструкции восточной окраины балтики в...unclassified

“…К настоящему времени все крупные тектонические зоны Южного Урала в разной степени охарактеризованы результатами изучения зерен dZr из ордовикских осадочных и/или метаосадочных толщ [Ryazantsev et al, 2019;Kuznetsov, Romanyuk, 2021], например для следующих тектонических зон Западно-Уральской мегазоны имеются такие данные: Таганайско-Белорецкая единица, Кракинский аллохтон, СМК, ММК, Сакмарский аллохтон (см. рис.…”

Section: обсуждение результатовunclassified

“…Результаты геохронологического и изотопно-геохимического изучения циркона из разновозрастных докембрийских и палеозойских осадочных, магматических и метаморфических комплексов (протоуралид и уралид) Южного Урала позволили существенно уточнить характер геодинамической эволюции южного сегмента уральского обрамления Восточно-Европейской платформы (ВЕП) [Samygin et al, 2007[Samygin et al, , 2010Puchkov, 2010;Kuznetsov et al, 2012Kuznetsov et al, , 2014Kuznetsov et al, , 2017Romanyuk et al, 2014;Maslov et al, 2016;Ryazantsev et al, 2019;Kuznetsov, Romanyuk, 2021; и ссылки в данных работах]. В то же время некоторые комплексы запада Южного Урала все еще остаются недостаточно охарактеризованными в этом отношении.…”

Section: Introductionunclassified

“…В настоящей статье мы представляем результаты изучения зерен dZr из двух проб (R14-396 и G18-1), отобранных из кварцитов (кварцитопесчаников) СМК, распространенных в южной части Суванякской тектонической единицы. Часть результатов, полученных по пробе R14-396, была ранее приведена в работе [Ryazantsev et al, 2019] для крайне непредставительной в количественном смысле выборки в 40 датировок, из которых всего лишь 30 кондиционны. В настоящей работе приведены дополнительные результаты по пробе R14-396.…”

Section: Introductionunclassified

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ON PALEOTECTONIC BELONGING OF THE SUVANYAK METAMORPHIC COMPLEX (SOUTHERN URALS) FROM THE U-Th-Pb DATING OF DETRITAL ZIRCON GRAINS

Голионко

Кузнецов

Strashko

et al. 2023

Geodin. tektonofiz.

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U-Th-Pb isotope dating of grains of detrital zircon from quartzites of the Suvanyak metamorphic complex, which forms the Suvanyak tectonic unit that forms the western part of the Uraltau uplift, located in the east of the West Ural megazone in the Southern Urals. The results of isotope dating of grains of detrital zircon from quartzites of the southern part of the Suvanyak metamorphic complex (samples G18-1 and R14-396) show that numerous populations of Late Neoproterozoic–Early Cambrian detrital zircon grains suggest a Peri-Gondwanan origin of the primary sources of detrital material for the protolith of the studied rocks.The structure of the Suvanyak tectonic unit involves metamorphic formations of different ages – Early Paleozoic in the south and Late Precambrian in the north, which are now formally united into a single Suvanyak metamorphic complex. Their differentiation requires additional research.For the Late Paleozoic southeastern margin of the Baltica (at that time already involved in the structure of the composite continent Arct-Laurussia), according to the results of isotope-geochronological study of detrital zircon from the sedimentary and metasedimentary sequences of the Southern Urals, a number of the following tectonic structures were identified. Near the southeastern edge of the margin, there was a Late Neoproterozoic–Early Cambrian oceanic basin, within which a volcanic arc or arcs were active during 650–520 Ma. The structure of the southeastern edge of the margin included the Peri-Gondwanan terrane or terranes (? Cadomian type), as well as thick Riphean-Early Paleozoic sedimentary sequences, autochthonous to the Baltica.

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Section: палеотектонические реконструкции восточной окраины балтики в...unclassified

Section: обсуждение результатовunclassified

Section: Introductionunclassified

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ON PALEOTECTONIC BELONGING OF THE SUVANYAK METAMORPHIC COMPLEX (SOUTHERN URALS) FROM THE U-Th-Pb DATING OF DETRITAL ZIRCON GRAINS

Голионко

Кузнецов

Strashko

et al. 2023

Geodin. tektonofiz.

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“…в магматогенном цирконе) варьируется от 0.1 до 1.0 (см. недавние обзоры [Kirkland et al, 2015;Rubatto, 2017]). Низкие значения Th/U считаются статистически свойственными метаморфогенным кристаллам циркона.…”

Section: интерпретация величин Th/u в датированных зернах детритовогоunclassified

Time Constraints on the Formation of the Kandalaksha and Keretsk Grabens of the White Sea Paleo-Rift System From New Isotopic Geochronological Data

Кузнецов

Балуев

Terekhov

et al. 2021

Geodin. tektonofiz.

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Initially, the age and stratigraphic position of the Tersk formation were determined with respect to the fact that this formation overlaps the Early Proterozoic granitoids. Its top was marked by the rocks penetrated by the Late Devonian alkaline intrusions, including explosion pipes.This article presents the U-Pb isotopic dating of detrital zircon grains (dZr) from sandstones of the Tersk formation. It describes the geochemical compositions of the rocks and the Sm-Nd study results. In our study, the weighted average age of four youngest dZr grains from the sandstones of the Tersk formation is 1145±20 Ma, which suggests that the rocks above the studied rock layer (see the Tersk formation cross-section) are is not older than the end of the Middle Riphean. The U-Pb isotopic ages of dZr grains (provenance signals) from the sandstones of the Tersk formation were compared to the ages of other Upper Precambrian clastic strata in the northeastern East European platform (EEP) and adjacent areas. Our comparative analysis shows that these rocks significantly differ in age. This conclusion is in good agreement with the idea that at the end of the Middle and during the Late Riphean, several small (mainly closed) basins separated by uplifts dominated in the paleogeographic setting of the area wherein the White Sea rift system (WSRS) formed and developed. Temporal connections of these basins with the ocean were possible. Such paleogeographic setting does not favour the development of large rivers; this is why the grabens are mainly filled with local rock materials. The Keretsk and Kandalaksha grabens (WSRS) are filled with marine sediments eroded from the grabens walls. The local sediment sources include eclogite complexes (~1.9 Ga), which basic magmatism is dated at ~2.4–2.5 and ~2.7–2.9 Ga. Any potential primary sources for dZr grains are lacking in the area near the Keretsk graben. We suggest that such grains occurred due to recycling of the secondary sources of zircon, i.e. originated from ancient local sedimentary formations.

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The Laptev Sea orocline: How to tie loose ends of Arctic fold belts

Kuzmichev

Данукалова

2023

Earth-Science Reviews

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A Reconstruction of a Vendian–Cambrian Active Continental Margin within the Southern Urals: Results of Detrital Zircons Studying from Ordovician Terrigenous Rocks

Cited by 14 publications

References 26 publications

ON PALEOTECTONIC BELONGING OF THE SUVANYAK METAMORPHIC COMPLEX (SOUTHERN URALS) FROM THE U-Th-Pb DATING OF DETRITAL ZIRCON GRAINS

ON PALEOTECTONIC BELONGING OF THE SUVANYAK METAMORPHIC COMPLEX (SOUTHERN URALS) FROM THE U-Th-Pb DATING OF DETRITAL ZIRCON GRAINS

Time Constraints on the Formation of the Kandalaksha and Keretsk Grabens of the White Sea Paleo-Rift System From New Isotopic Geochronological Data

The Laptev Sea orocline: How to tie loose ends of Arctic fold belts

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