Provenance study of terrigenous rocks in basal beds of Uralides from Baidarata allochthon (Polar Urals): U-Pb dating of detrital zircons

U-Pb dating (LA-ICP-MS) of detrital zircons from the upper Cambrian - lower Ordovician terrigenous deposits of Baidarata allochthone (northern part of the Polar Urals) is performed. Analysis of the youngest populations of detrital zircons suggests wide development of Uralides instead of Preuralides as it was believed before. The source of sediments for investigated Baidarata allochtone rocks was probably Bedamel’ island arc rather than Timan orogen. According to results of statistical analysis of detrital zircons data from coeval deposits of Arctic region, similarity of sedimentary provenances for Baidarata allochtone, Novaya Zemlya and Severnaya Zemlya archipelagos is observed.

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First results of U-Pb LA-SF-ICP-MS-dating detrital zircons from the middle riphean (?) terrigenous deposits of the Polar Urals

Доклады Академии наук ◽

10.31857/s0869-56524854488-492 ◽

2019 ◽

Vol 485 (4) ◽

pp. 488-492

Author(s):

N. S. Ulyasheva ◽

Yu. I. Pystina ◽

A. M. Pystin ◽

O. V. Grakova ◽

V. B. Hubanov

Keyword(s):

Dominant Role ◽

Detrital Zircons ◽

Entire Series ◽

Polar Urals ◽

Icp Ms ◽

First Results ◽

Age Range ◽

Polar Ural ◽

The Polar Urals

The first results of U-Pb LA-SF-ICP-MS-dating of detrital zircons from terrigenous deposits of the Miniseishor suite of the Nyarovei series of the Harbei anticlinorium of the Polar Urals are presented. The series has a presumably Middle Riphean age and lies at the base of the section of the Polar Ural Upper Precambrian. The data obtained give grounds to limit the lower age interval for the formation of sediments of the Minisejshor suite abroad 660 million years ago. Allotment the Nyarovei series as a Middle Riphean straton is erroneous. Formation of the whole cut the Nyarovei series occurred in a relatively narrow age range at the end of the late Riphean. The dominant role in the formation of deposits of the entire series belonged to the products of erosion close arrays of deeply metamorphosed rocks.

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The First Results of U–Pb LA-SF-ICP-MS Dating of Detrital Zircons from Middle Riphean(?) Terrigenous Deposits of the Polar Urals

Doklady Earth Sciences ◽

10.1134/s1028334x19040081 ◽

2019 ◽

Vol 485 (2) ◽

pp. 386-390

Author(s):

N. S. Ulyasheva ◽

Yu. I. Pystina ◽

A. M. Pystin ◽

O. V. Grakova ◽

V. B. Khubanov

Keyword(s):

Detrital Zircons ◽

Polar Urals ◽

Icp Ms ◽

First Results ◽

The Polar Urals

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U–Pb Age and Hf Isotope Geochemistry of Detrital Zircons from Cambrian Sandstones of the Severnaya Zemlya Archipelago and Northern Taimyr (Russian High Arctic)

Minerals ◽

10.3390/min10010036 ◽

2019 ◽

Vol 10 (1) ◽

pp. 36 ◽

Cited By ~ 1

Author(s):

Victoria B. Ershova ◽

Andrei V. Prokopiev ◽

Andrey K. Khudoley ◽

Tom Andersen ◽

Kåre Kullerud ◽

...

Keyword(s):

Detrital Zircon ◽

Isotope Geochemistry ◽

High Arctic ◽

Detrital Zircons ◽

Hf Isotope ◽

Magmatic Arc ◽

Novaya Zemlya ◽

Late Neoproterozoic ◽

Severnaya Zemlya ◽

Severnaya Zemlya Archipelago

U–Pb and Lu–Hf isotope analyses of detrital zircons collected from metasedimentary rocks from the southern part of Kara Terrane (northern Taimyr and Severnaya Zemlya archipelago) provide vital information about the paleogeographic and tectonic evolution of the Russian High Arctic. The detrital zircon signatures of the seven dated samples are very similar, suggesting a common provenance for the clastic detritus. The majority of the dated grains belong to the late Neoproterozoic to Cambrian ages, which suggests the maximum depositional age of the enclosing sedimentary units to be Cambrian. The εHf(t) values indicate that juvenile magma mixed with evolved continental crust and the zircons crystallized within a continental magmatic arc setting. Our data strongly suggest that the main provenance for the studied clastics was located within the Timanian Orogen. A review of the available detrital zircon ages from late Neoproterozoic to Cambrian strata across the wider Arctic strongly suggests that Kara Terrane, Novaya Zemlya, Seward Peninsula (Arctic Alaska), Alexander Terrane, De Long Islands, and Scandinavian Caledonides all formed a single tectonic domain during the Cambrian age, with clastics predominantly sourced from the Timanian Orogen.

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