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 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 openi...

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Published in:Marine Micropaleontology
Main Authors: A. A. Soboleva, N. Yu. Nikulova, V. B. Khubanov, А. А. Соболева, Н. Ю. Никулова, В. Б. Хубанов
Other Authors: The work was carried out within the framework of the research projects of the IG Komi SC UB RAS (122040600012-2, 122040600013-9)., Работы проводились в рамках тем НИР ИГ ФИЦ Коми НЦ УрО РАН (122040600012-2, 122040600013-9).
Format: Article in Journal/Newspaper
Language:Russian
Published: Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch 2024
Subjects:
U-Pb возраст
Lower Ordovician
continental rifting
Uralides
Timanides
Polar Urals
sandstones
detrital zircon
U-Pb age
нижний ордовик
континентальный рифтогенез
уралиды
тиманиды
Полярный Урал
песчаники
детритовый циркон
Arctic
Polarforschung
Online Access:https://www.gt-crust.ru/jour/article/view/1825
https://doi.org/10.5800/GT-2024-15-2-0755
id ftjgat:oai:oai.gtcrust.elpub.ru:article/1825
record_format openpolar
institution Open Polar
collection Geodynamics & Tectonophysics
op_collection_id ftjgat
language Russian
topic U-Pb возраст
Lower Ordovician
continental rifting
Uralides
Timanides
Polar Urals
sandstones
detrital zircon
U-Pb age
нижний ордовик
континентальный рифтогенез
уралиды
тиманиды
Полярный Урал
песчаники
детритовый циркон
spellingShingle U-Pb возраст
Lower Ordovician
continental rifting
Uralides
Timanides
Polar Urals
sandstones
detrital zircon
U-Pb age
нижний ордовик
континентальный рифтогенез
уралиды
тиманиды
Полярный Урал
песчаники
детритовый циркон
A. A. Soboleva
N. Yu. Nikulova
V. B. Khubanov
А. А. Соболева
Н. Ю. Никулова
В. Б. Хубанов
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
topic_facet U-Pb возраст
Lower Ordovician
continental rifting
Uralides
Timanides
Polar Urals
sandstones
detrital zircon
U-Pb age
нижний ордовик
континентальный рифтогенез
уралиды
тиманиды
Полярный Урал
песчаники
детритовый циркон
description 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 ...
author2 The work was carried out within the framework of the research projects of the IG Komi SC UB RAS (122040600012-2, 122040600013-9).
Работы проводились в рамках тем НИР ИГ ФИЦ Коми НЦ УрО РАН (122040600012-2, 122040600013-9).
format Article in Journal/Newspaper
author A. A. Soboleva
N. Yu. Nikulova
V. B. Khubanov
А. А. Соболева
Н. Ю. Никулова
В. Б. Хубанов
author_facet A. A. Soboleva
N. Yu. Nikulova
V. B. Khubanov
А. А. Соболева
Н. Ю. Никулова
В. Б. Хубанов
author_sort A. A. Soboleva
title 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
title_short 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
title_full 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
title_fullStr 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
title_full_unstemmed 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
title_sort 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
publisher Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch
publishDate 2024
url https://www.gt-crust.ru/jour/article/view/1825
https://doi.org/10.5800/GT-2024-15-2-0755
genre Arctic
Polarforschung
Полярный Урал
genre_facet Arctic
Polarforschung
Полярный Урал
op_source Geodynamics & Tectonophysics; Том 15, № 2 (2024); 0755
Геодинамика и тектонофизика; Том 15, № 2 (2024); 0755
2078-502X
op_relation https://www.gt-crust.ru/jour/article/view/1825/816
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spelling ftjgat:oai:oai.gtcrust.elpub.ru:article/1825 2024-05-19T07:33:35+00:00 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 РУБЕЖ ТИМАНСКОГО И УРАЛЬСКОГО ЦИКЛОВ ТЕКТОНИЧЕСКОЙ ЭВОЛЮЦИИ: РЕЗУЛЬТАТЫ ДАТИРОВАНИЯ ДЕТРИТОВОГО ЦИРКОНА ИЗ БАЗАЛЬНЫХ ГОРИЗОНТОВ НИЖНЕПАЛЕОЗОЙСКОГО СИНРИФТОВОГО КОМПЛЕКСА ПОЛЯРНОГО УРАЛА, СВОДКА ОПУБЛИКОВАННЫХ ДАННЫХ О ВОЗРАСТЕ МАГМАТИЧЕСКИХ ПОРОД A. A. Soboleva N. Yu. Nikulova V. B. Khubanov А. А. Соболева Н. Ю. Никулова В. Б. Хубанов The work was carried out within the framework of the research projects of the IG Komi SC UB RAS (122040600012-2, 122040600013-9). 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Geodynamics & Tectonophysics; Том 15, № 2 (2024); 0755 Геодинамика и тектонофизика; Том 15, № 2 (2024); 0755 2078-502X U-Pb возраст Lower Ordovician continental rifting Uralides Timanides Polar Urals sandstones detrital zircon U-Pb age нижний ордовик континентальный рифтогенез уралиды тиманиды Полярный Урал песчаники детритовый циркон info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2024 ftjgat https://doi.org/10.5800/GT-2024-15-2-075510.31241/FNS.2023.20.03410.1134/S1028334X1705019110.19110/geov.2023.10.210.2113/RGG2022443610.19110/geov.2021.6.210.1144/GSL.MEM.2004.030.01.1110.1016/j.chemgeo.2004.01.00310.1111/ggr.1223810.18814/epiiugs/2013/v36 2024-04-25T00:27:51Z 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 ... Article in Journal/Newspaper Arctic Polarforschung Полярный Урал Geodynamics & Tectonophysics Marine Micropaleontology 142 13 24

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