Structural parageneses in a discrete geological medium

Koronovsky, N. V.; Наймарк, А. А.

doi:10.3103/s0145875213010079

Cited by 4 publications

(6 citation statements)

References 3 publications

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“…Although evidence for final collision stages no older than 850 Ma has been revealed in particular litho spheric blocks, the interval of 1300-900 Ma is cur rently accepted as the time of the Grenville epoch [77]. According to other sources, this interval is some what younger (1210-930 Ma) [25]. With allowance for this, collisional lithospheric blocks dated at 1200-900 ± 50 Ma are accepted as the age equivalents of the Gren ville Orogeny in the North American continent.…”

Section: Overview Of Rodinia's History and Chronology Of Grenville Evmentioning

confidence: 99%

Grenville tectonic events and evolution of the Yenisei Ridge at the western margin of the Siberian Craton

et al. 2014

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Geological, petrologic, geochemical, and isotopic geochronological evidence for Grenville events at the western margin of the Siberian Craton are considered. These events were related to assembly of the Rodinia supercontinent. Multiple manifestations of riftogenic and within plate magmatism at the final stage of orogenic evolution gave rise to breakdown of Rodinia and the formation of the Paleoasian ocean. The results allowed us to develop a new concept on the Precambrian geological evolution of the Yenisei Ridge and the processes that created its tectonic structure. The chronological sequence of events in the history of the Transangarian Yenisei Ridge is based on geological evidence and isotopic dating of Precambrian complexes variable in geodynamic nature. Four tectonic stages dated at 1.4-1.1, 1.1-0.9, 0.90-0.85, and 0.8-0.6 Ga were controlled by collision and extension recognized from large regional linear crustal structural elements. The evolution of the Transangarian Yenisei Ridge, which lasted for ~650 Ma, corresponds in duration to supercontinental cycles that begin from rifting and breakdown of the predated supercontinent and was com pleted by orogeny and the formation of a new supercontinent. The regional geodynamic history correlates with the synchronous sequence and similar style of tectonothermal events at the periphery of the large Pre cambrian Laurentia and Baltica cratons. This is evidenced by paleocontinental reconstructions, which con firm close spatiotemporal links of Siberia with cratons in the northern Atlantic 1400-600 Ma ago and indi cate incorporation of the Siberian Craton into the ancient Nuna and Rodinia supercontinents.

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Section: Overview Of Rodinia's History and Chronology Of Grenville Evmentioning

confidence: 99%

Grenville tectonic events and evolution of the Yenisei Ridge at the western margin of the Siberian Craton

et al. 2014

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“…The location of the great glacier, on the high ridges of the Arctic, was not known before the new work [33]. There is a lot of research on the warm climate of the Early Holocene and the emergence of humans and many animals [7,10,11,13,28]. However, there is very little information about the location of human settlements at this time, since during the catastrophic flooding of the territory 6.0 thousand years ago, they were mostly destroyed.…”

Section: Discussionmentioning

confidence: 99%

“…First of all, there were several epochs of sharp cooling and formation of large glaciers -0.5 million years ago, 0.3 million years ago, and 70-18 thousand years ago. The location of glaciers is assumed to be in Canada, Scandinavia and on the islands of the Arctic [13]. However, a special study of this issue has shown that the place of formation of the giant glacier was the high mountain ranges of the Arctic (on Greenland and on the Central basin's territory -Gakkel and Lomonosov ranges), from where it slid over great distances to Europe and North America [33].…”

Section: Extreme Changes In the Arctic Environment At The End Of The ...mentioning

confidence: 99%

“…The final stage of the Pleistocene, the Valdai glaciations epoch (Worm -in Western Europe, Wisconsin -in North America), about 20-18 thousand years ago, was characterized by extremely harsh conditions when the global temperature dropped by 4-5°C [13].…”

Section: Extreme Changes In the Arctic Environment At The End Of The ...mentioning

confidence: 99%

“…The Anthropogen (Quaternary) is the newest and very short stage in the geological history of the Earth -1.6 million years (and its end, the Holocene -only 11 thousand years), but it is saturated with major climatic and oceanic logical events in the Arctic and human life history, including dramatic ones [10,11,13,19]. However, it has been little discussed in science.…”

Section: Introductionmentioning

confidence: 99%

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The extreme Anthropogen of the Arctic: the formation of the Great Glacier, the emergence a man and the Arctic Ocean in the Early Holocene

Zhirnov

2023

E3S Web Conf.

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The relevance of the article stems from the need to consider recent events in the Arctic in recent time, which are largely contradictory. The aim of the study is to show extreme environmental changes in the Arctic of anthropogenic nature, including the emergence of man and the Arctic Ocean in the Early Holocene. The territory of the Arctic was a landmass with high mountains, in the period preceding the Holocene, on which a large glacier formed 30-18 thousand years ago (Late Pleistocene). The glacier slid irrepressibly southward over great distances, where it covered vast areas of Europe and North America. In the years that followed, a dramatic warming and active melting of the glacier began. By the beginning of the Holocene, the glacier had melted, and a narrow strait of the Atlantic appeared at the foot of Greenland. Coniferous-deciduous forests, numerous rivers and the first human settlements appeared on the flat territory of the Arctic, and various animals – mammoths, horses, bulls - spread out. However, a major catastrophic event occurred by the middle of the Holocene (6.0 thousand years ago), after active volcanism in the Arctic: the collapse of the central part of the Arctic to a depth of about 5 km and the formation of the Central Arctic graben, associated with the appearance of a huge amount of endogenous water. There began a rapid movement of water on the flat parts of the Arctic and the formation of the modern huge, shallow (50-100 m) shelf - the Arctic Ocean. Many human settlements were flooded, animals escaped, in part, on high uplands. For example, huge animal cemeteries were preserved on the Novosibirsk Islands. A new cooling of the climate occurred 4 thousand years ago, and an ice sheet formed on the surface of the ocean, which led to the name of the North Glacial Ocean in Russia. Modern man began to explore the coastal territories of the Arctic shelf since the mid - Holocene, but active industrial development of the Arctic began in the 21st century.

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On the continuity and discreteness of the lithosphere in the problems of dynamic geology

Короновский

Наймарк

2015

Moscow Univ. Geol. Bull.

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Structural parageneses in a discrete geological medium

Cited by 4 publications

References 3 publications

Grenville tectonic events and evolution of the Yenisei Ridge at the western margin of the Siberian Craton

Grenville tectonic events and evolution of the Yenisei Ridge at the western margin of the Siberian Craton

The extreme Anthropogen of the Arctic: the formation of the Great Glacier, the emergence a man and the Arctic Ocean in the Early Holocene

On the continuity and discreteness of the lithosphere in the problems of dynamic geology

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