Correlation of neoproterozoic volcanism in the southeastern White Sea region and western Urals: New age data on the Solozero basalts (Onega Graben)

Носова, А. А.; Larionova, Yu. O.; Veretennikov, N. V.; Yutkina, E. V.

doi:10.1134/s1028334x08020268

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…-возраст, УФ -уфтюгская свита, ТМ -тамницкая свита, ЛМ -лямицкая свита, УП -устьпинежская серия. Скважины Онежского грабена: 1 -аргиллиты; 2 -алевролиты; 3 -песчаники; 4 -гравелиты, конгломераты; 5 -туфопесчаники; 6 -туфы, туффиты; 7 -кварцевые долериты; 8 -долериты, базальты; 9 -места отбора проб для изотопных исследований (по [Nosova et al, 2008]). Fig.…”

Section: Figunclassified

“…-age, УФ -Uftyug Formation, ТМ -Tamnitsa Formation, ЛМ -Lyamitsa formation, УП -Ust-Pinega Group. Legend for the Onega graben wells: 1 -mudstone; 2 -siltstone; 3 -sandstone; 4 -gravel stone, conglomerate; 5 -tuff sandstone; 6tuff, tuffite; 7 -quartz dolerite; 8 -dolerite, basalt; 9 -sampling sites for isotope studies (after [Nosova et al, 2008] Часто по красноцветным песчаникам терской свиты здесь и в других местах ее распространения развиты зоны и участки осветления -оглиения. Эти участки в сечении имеют в основном округлые шарообразные (до 10 см) или неправильные со скругленными краями очертания (рис.…”

Section: Figunclassified

“…Довольно значительные отрицательные величины ε Nd (t) для метасоматитов и флюорита (-11.3 и -12.1 соответственно) свидетельствуют о том, что при формировании метасоматитов и связанной с ними аметист-флюоритовой минерализации существенную роль играли флюиды, изотопно-равновесные древнему изотопно-зрелому коровому материалу. Следует отметить, что возраст аметист-флюоритовой минерализации близок ко времени внедрения базальтов солозерской толщи Онежского грабена [Nosova et al, 2008] (см. рис.…”

Section: о возрасте терской свиты и времениunclassified

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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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Section: о возрасте терской свиты и времениunclassified

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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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Sr–Nd–O isotopic evidence of variable sources of mantle metasomatism in the subcratonic lithospheric mantle beneath the Grib kimberlite, northwestern Russia

Lebedeva

Носова

Каргин

et al. 2020

Lithos

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New palaeodirections and palaeointensity data from extensive profiles through the Ediacaran section of the Volyn Basalt Province (NW Ukraine)

Thallner

Щербакова

Бахмутов

et al. 2022

Geophysical Journal International

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Summary Changes of the geomagnetic field over geologic time scales can be used to study the evolution and processes of its sources in Earth's deep interior. As a stark contrast to the geomagnetic field behaviour of the recent past, the field in the late Neoproterozoic is defined by ambiguous polar wander paths, ultra-low field strengths and a period of extreme reversal hyperactivity. Palaeointensity data from this time are still scarce and conclusions made from these data suffer from large uncertainties brought by a low sampling density. In this study, we present new palaeomagnetic and palaeointensity data from quarry outcrops and five deep drill cores, covering the longest and most complete profiles through the Ediacaran units in the Volyn Basalt Province (NW-Ukraine) to date. Palaeodirectional analysis of thermal and alternating field demagnetisation experiments reveal at least six reversals in the profile as well as four palaeopoles that agree with previously published poles. Whole-rock palaeointensity estimates are derived from a multi-method approach that utilises thermal and microwave Thellier experiments in Coe- and IZZI-protocol as well as Wilson and double-heating-Shaw experiments. These produce instantaneous site-mean palaeointensity estimates in the range of 2.1±0.4 µT - 11.1±3.5 µT and virtual dipole moments in the range of 0.31±0.06 ×1022Am2 - 1.67±0.53 ×1022Am2. Small-scale variations of palaeointensities throughout the profile not only show extremely weak field strengths around polarity changes but could also suggest that the field strength never fully recovered between reversals. These new results increase the density of intensity data coverage for Baltica in the Late Ediacaran and, in combination with previously published Ediacaran dipole moments, support an extremely weak field that seems to increase in strength towards the Ediacaran-Cambrian transition.

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Correlation of neoproterozoic volcanism in the southeastern White Sea region and western Urals: New age data on the Solozero basalts (Onega Graben)

Cited by 5 publications

References 6 publications

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

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

Sr–Nd–O isotopic evidence of variable sources of mantle metasomatism in the subcratonic lithospheric mantle beneath the Grib kimberlite, northwestern Russia

New palaeodirections and palaeointensity data from extensive profiles through the Ediacaran section of the Volyn Basalt Province (NW Ukraine)

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