The New Data on Stratigraphy of the Riphean Stratotype in the Southern Urals, Russia

Пучков, В. Н.; Краснобаев, А. А.; Сергеева, Н. Д.

doi:10.4236/gep.2014.23015

Cited by 18 publications

(21 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…На Урале, благодаря совершенствованию аналитических методов, геохимический облик магматических пород устанавливается в последнее время с достаточной достоверностью ; Холоднов и др., 2017], а возраст их непрерывно уточняется [Puchkov et al, 2014;и др. ], что при сопоставлении с данными других регионов приводит к выводу о возможной принадлежности их к плюмам и суперплюмам субглобального масштаба [Пучков, 2010Puchkov, 2016;Puchkov et al, 2013Puchkov et al, , 2016.…”

Section: плюмы на уралеunclassified

Plumes - a new word in Geology of the Urals

Пучков¹

2018

LITOSFERA

View full text Add to dashboard Cite

Предмет исследований. Представления о плюмовой тектонике возникли и стали разрабатываться всего лишь несколькими годами позже теории тектоники литосферных плит. Однако на Урале вопрос о проявлениях плюмтектоники, в отличие от плейт-тектоники, практически не поднимался вплоть до последнего десятилетия. Это объясняется сложностью выявления плюмов в древних складчатых областях вообще, поскольку в них невозможно применение сейсмотомографии, а магматические комплексы частично скрыты под более молодыми осадками, частично эродированы и вдобавок подверглись искажениям, связанным с распадом континентов, субдукцией и складчато-покровными деформациями. Материалы и методы. В течение последнего десятилетия среди магматических комплексов Урала (преимущественно в пределах его западного склона), Пай-Хоя и Новой Земли, благодаря уточнению возраста магматических формаций, изучению их геодинамически обусловленной петрохимии и корреляции их с комплексами аналогичного возраста в других регионах, автору удалось наметить 10 уровней возможного проявления плюмовых и суперплюмовых событий. Результаты. Предполагается наличие на территории современного Урала реликтов следующих плюмов: навышского (нижний рифей), машакского (средний рифей), аршинского и кирябинского (терминальный рифей), маньхамбовского (кембрий), кидрясовского (ранний-средний ордовик), ушатского (поздний ордовик-ранний силур), Кольско-Днепровского (девон), степнинского (пермь), Урало-Сибирского (ранний-средний триас).

show abstract

Section: плюмы на уралеunclassified

Plumes - a new word in Geology of the Urals

Пучков¹

2018

LITOSFERA

View full text Add to dashboard Cite

show abstract

“…Late Mesoproterozoic magmatism and rift-basin development demonstrate that the margins of the craton of Laurentia experienced localized crustal thinning, presumably in response to a combination of mantle upwelling associated with significant thermal anomalies, slab-pull subduction, and rapid plate motion of the Laurentian plate subducting underneath Amazonia (Swanson-Hysell et al, 2019). We speculate that other poorly geochronologically constrained late Mesoproterozoic successions on Laurentia from the American southwest (Timmons et al, 2005) to northwestern Canada (Pinguicula Group, Yukon) and possibly as far as Siberia (Puchkov et al, 2014) may record similar geodynamically linked basin formation or rejuvenation ca. 1090-1050 Ma.…”

Section: Resultsmentioning

confidence: 89%

Re-Os geochronology highlights widespread latest Mesoproterozoic (ca. 1090–1050 Ma) cratonic basin development on northern Laurentia

Greenman

Rooney

Patzke

et al. 2021

Geology

View full text Add to dashboard Cite

The terminal Mesoproterozoic was a period of widespread tectonic convergence globally, culminating in the amalgamation of the Rodinia supercontinent. However, in Laurentia, long-lived orogenesis on its eastern margin was punctuated by short-lived extension that generated the Midcontinent Rift ca. 1110–1090 Ma. Whereas this cratonic rift basin is typically considered an isolated occurrence, a series of new depositional ages demonstrate that multiple cratonic basins in northern Laurentia originated around this time. We present a Re-Os isochron date of 1087.1 ± 5.9 Ma from organic-rich shales of the Agu Bay Formation of the Fury and Hecla Basin, which is one of four closely spaced cratonic basins spanning from northeastern Canada to northwestern Greenland known as the Bylot basins. This age is identical, within uncertainty, to ages from the Midcontinent Rift and the Amundsen Basin in northwestern Canada. These ages imply that the late Mesoproterozoic extensional episode in Laurentia was widespread and likely linked to a common origin. We propose that significant thermal anomalies and mantle upwelling related to supercontinent assembly centered around the Midcontinent Rift influenced the reactivation of crustal weaknesses in Arctic Laurentia beginning ca. 1090 Ma, triggering the formation of a series of cratonic basins.

show abstract

“…Taking into account new data supporting the idea of reducing the age of the Riphean basement to the level of 1750-1800 Ma (Puchkov et al 2014b), it is most likely that the East European Craton had been already formed by 1.8 Ga.…”

Section: Resultsmentioning

confidence: 95%

The early Precambrian history of rock metamorphism in the Urals segment of crust

Pystin

Pystina

2014

International Geology Review

View full text Add to dashboard Cite

Early Precambrian rock units in the Urals are present in several polymetamorphic complexes, which are exposed in the Urals in the form of small (<1500 km 2 ) tectonic blocks. Their ages are Archaean (as old as 3.5 Ga) and Palaeoproterozoic. During the formation of these complexes in the early Precambrian, two stages of ultra-high-temperature (granulite) metamorphism occurred. The maximum age of the early Neoarchaean stage of metamorphism is 2.79 Ga. Evidence of this metamorphic event includes the dating of the Taratash gneiss-granulite complex of the South Urals. Gneiss-migmatite complexes, which dominate the lower Precambrian section of the Urals, were formed in the Palaeoproterozoic during the sequential appearance of granulite facies metamorphism followed by amphibolite facies metamorphism and accompanying granitization. The maximum age of the Palaeoproterozoic stage of granulite metamorphism in the Alexandrov gneissmigmatite complex, the most well-studied complex in the South Urals, is 2.08 Ga.

show abstract

The New Data on Stratigraphy of the Riphean Stratotype in the Southern Urals, Russia

Cited by 18 publications

References 7 publications

Plumes - a new word in Geology of the Urals

Plumes - a new word in Geology of the Urals

Re-Os geochronology highlights widespread latest Mesoproterozoic (ca. 1090–1050 Ma) cratonic basin development on northern Laurentia

The early Precambrian history of rock metamorphism in the Urals segment of crust

Contact Info

Product

Resources

About