The Nature of the Puchezh–Katunki Impact Structure (the Central Part of the East European Platform): Results of the U‒Th‒Pb Isotope System Study of Detrital Zircons from Explosive Breccias

Kolodyazhny, S. Yu.; Kuznetsov, N. B.; Romanyuk, T. V.; Strashko, A. V.; Shalaeva, E. A.; Novikova, A. S.; Dubenskiy, A. S.; Erofeeva, K. G.; Sheshukov, V. S.

doi:10.1134/s0016852123050047

Geotecton.

2023

DOI: 10.1134/s0016852123050047

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The Nature of the Puchezh–Katunki Impact Structure (the Central Part of the East European Platform): Results of the U‒Th‒Pb Isotope System Study of Detrital Zircons from Explosive Breccias

S. Yu. Kolodyazhny,

N. B. Kuznetsov,

T. V. Romanyuk

et al.

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2024

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Cited by 2 publications

References 36 publications

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U-Pb AGE OF ZIRCONS FROM PALEOPROTEROZOIC SECONDARY QUARTZITES OF THE BOLSHOI TYUTERS ISLAND AND FROM SANDY MATRIX OF EARLY RIPHEAN CONGLOMERATES OF THE GOGLAND ISLAND (GULF OF FINLAND): FEATURES OF THE PRE-RIPHEAN HIATUS IN SEDIMENTATION IN THE NORTHEAST OF THE EAST EUROPEAN PLATFORM

Terekhov,

Kuznetsov,

Romanyuk

et al. 2024

Geodin. tektonofiz.

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The paper presents the results of U-Pb isotope dating of zircons extracted from rocks of the southern part of the Baltic Shield (Early Riphean conglomerates and Paleoproterozoic secondary quartzites) and makes a comparison of these results with the ages of crystalline complexes of the East European Platform (EEP). The paper presents the study results on composition of quartzites from the Bol. Tyuters and Gogland islands. There has been discussion about tectonic and paleogeographical features in the period prior to the beginning of Riphean sedimentation in the northeastern part of the EEP. It is concluded that the conglomerates are composed of erosional products of mainly Paleoproterozoic and less frequently Archean crystalline complexes. At the same time, the rocks at the base of the generalized section of Riphean deposits (Gogland group), did not contain any zircons with ages referring to 200 million years prior to the inferred time (1640–1660 Ma) of the beginning of the conglomerate sequence formation. The rocks that compose the Gogland group and their underlying Paleoproterozoic basement rocks have significant differences. We associate these differences with the existence of pre-Riphean sheet-like deposits, comprising rocks of essentially quartz composition, in the southern Baltic Shield, in the upper levels of the peneplenized Paleoproterozoic basement structure. The deposits relics are only found on the Bol. Tyuters Island; in all other places, these deposits were completely eroded or underwent significant structural and material transformations. The absence of detrital zircon grains with ages ranging from 1.87 to 1.65 Ga in the clastic rocks of the Riphean basal horizons implies no noticeable Pre-Riphean and Early Riphean orogenic movements in the northeastern part of the EEP. Tectono-magmatic reactivation in this region occurred only in the middle of the Early Riphean.

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U-Pb AGE OF ZIRCONS FROM PALEOPROTEROZOIC SECONDARY QUARTZITES OF THE BOLSHOI TYUTERS ISLAND AND FROM SANDY MATRIX OF EARLY RIPHEAN CONGLOMERATES OF THE GOGLAND ISLAND (GULF OF FINLAND): FEATURES OF THE PRE-RIPHEAN HIATUS IN SEDIMENTATION IN THE NORTHEAST OF THE EAST EUROPEAN PLATFORM

Terekhov,

Kuznetsov,

Romanyuk

et al. 2024

Geodin. tektonofiz.

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Magmatites of the Kastel Mountain as a Local Source of Detrital Zircons for the Demerdzhi Formation (Southern Demerdzhi Mountain), Mountainous Crimea

Romanyuk,

Kuznetsov,

Novikova

et al. 2024

Geodin. tektonofiz.

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The paper presents the first results of U-Pb LA-ICP-MS isotope dating (GIN RAS) of accessory zircon from magmatites of the Kastel Mountain and detrital zircons from the sandy matrix of conglomerates of the lower subformation of the Demerdzhi formation (vicinity of the Southern Demerdzhi Mountain). The three age estimates – (±1σ) – 147±1, 156±1 and 167±1 Ma, – obtained for granitoids of the Kastel intrusive, are consistent with the concept of its longterm and multi-stage magmatic evolution. The age of 167±1 Ma coincides with the final stages of the episode of bimodal magmatism widespread throughout the Mountainous Crimea from the Cape Fiolent to the Karadag. The intrusion of the first portions of basic magma near this time boundary had initiated the Kastel intrusion formation. The fractionation of basic magma during the second stage about 156±1 Ma gave rise to the formation of silicic melts from which the plagiogranites, comprising most of Kastel intrusive, were crystallized. About 147±1 Ma, the residual portions of silicic melts as small aplite veins intervened in the main volume of the intrusive and the adjacent host rocks.A comparison was made of the currently known ages of magmatites and detrital zircons from sandy rocks of some of the Triassic-Jurassic sedimentary strata of the Mountainous Crimes in order to clarify the source areas of the materials constituting the stratified rocks. It was shown that the magmatites of Kastel Mountain were a local source for the Demerdzhi formation.

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The Nature of the Puchezh–Katunki Impact Structure (the Central Part of the East European Platform): Results of the U‒Th‒Pb Isotope System Study of Detrital Zircons from Explosive Breccias

Cited by 2 publications

References 36 publications

U-Pb AGE OF ZIRCONS FROM PALEOPROTEROZOIC SECONDARY QUARTZITES OF THE BOLSHOI TYUTERS ISLAND AND FROM SANDY MATRIX OF EARLY RIPHEAN CONGLOMERATES OF THE GOGLAND ISLAND (GULF OF FINLAND): FEATURES OF THE PRE-RIPHEAN HIATUS IN SEDIMENTATION IN THE NORTHEAST OF THE EAST EUROPEAN PLATFORM

U-Pb AGE OF ZIRCONS FROM PALEOPROTEROZOIC SECONDARY QUARTZITES OF THE BOLSHOI TYUTERS ISLAND AND FROM SANDY MATRIX OF EARLY RIPHEAN CONGLOMERATES OF THE GOGLAND ISLAND (GULF OF FINLAND): FEATURES OF THE PRE-RIPHEAN HIATUS IN SEDIMENTATION IN THE NORTHEAST OF THE EAST EUROPEAN PLATFORM

Magmatites of the Kastel Mountain as a Local Source of Detrital Zircons for the Demerdzhi Formation (Southern Demerdzhi Mountain), Mountainous Crimea

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