The early Proterozoic Pechenga-Varzuga Belt: a case of Precambrian back-arc spreading

Шарков, Е. В.; Smolkin, V. F.

doi:10.1016/s0301-9268(96)00041-1

Cited by 55 publications

(19 citation statements)

References 12 publications

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“…An initial break-up of the Archaean supercontinent and the formation of the Kola Ocean is roughly dated to 2100-2060 Ma and is marked by arc-related volcanic rocks and back-arc-basin volcaniclastic sediments carrying a significant juvenile signature (e.g. Sharkov and Smol'kin 1997;Daly et al 2006). The break-up of the Fennoscandian Shield led to the onset of open marine conditions along the fringing continental margin to the northeast of the Kola Ocean and along the Karelian craton.…”

Section: -2060 Ma Periodmentioning

confidence: 99%

3.3 Palaeotectonic and Palaeogeographic Evolution of Fennoscandia in the Early Palaeoproterozoic

Melezhik

Hanski

2012

Frontiers in Earth Sciences

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Section: -2060 Ma Periodmentioning

confidence: 99%

3.3 Palaeotectonic and Palaeogeographic Evolution of Fennoscandia in the Early Palaeoproterozoic

Melezhik

Hanski

2012

Frontiers in Earth Sciences

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“…The geochemistry of the mafic volcanic rocks indicates relations to plume or T-MORB types. The above-mentioned magmatic bodies make up the Early Palaeoproterozoic LIP in eastern Fennoscandia [Sharkov, Smolkin, 1997].…”

Section: Evidence Of Initial Riftingmentioning

confidence: 99%

“…The T-MORB-type tholeiitic pillow lavas in the Pechenga Structure (2.11-1.92 Ga) are combined with picritic lava flows and felsic ash flows that geochemically resemble the products of volcanic eruptions on oceanic islands. Subvolcanic gabbro-wehrlite bodies related to the activity of these volcanoes intruded the lower portion of the tholeiitic sequence, but are more abundant as lenticular tectonic boudins in the imbricate complex of sulphidated terrigenous rocks [Melezhik, Sturt, 1994;Mints et al, 1996;Sharkov, Smolkin, 1997;Skuf'in, Theart, 2005;Melezhik et al, 2012]. This complex, known as a productive layer of the Pechenga Cu-Ni ore field, was interpreted as a fragment of the accretionary prism [Mints et al, 1996].…”

Section: Rifting and Partial Disruption Of Lauroscandiamentioning

confidence: 99%

“…This complex, known as a productive layer of the Pechenga Cu-Ni ore field, was interpreted as a fragment of the accretionary prism [Mints et al, 1996]. The youngest (1.87-1.86 Ga) rock complexes of the Pechenga-Varzuga Belt include rhyolite, dacite, andesite, picrite, and high-Mg basalt of the suprasubduction type; N-MORB in association with volcaniclastic rocks and black shale occur in subordinate amounts [Melezhik, Sturt, 1994;Sharkov, Smolkin, 1997].…”

Section: Rifting and Partial Disruption Of Lauroscandiamentioning

confidence: 99%

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Age and isotopic geochemical characteristics of Archean carbonatites and alkaline rocks of the Baltic shield

2007

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Paradoxically, the lists of "proxies" of both plate-and plume-related settings are devoid of even a mention of the high-grade metamorphic rocks (granulite, amphibolite and high-temperature eclogite facies). However, the granulite-gneiss belts and areas which contain these rocks, have a regional distribution in both the Precambrian and the Phanerozoic records. The origin and evolution of the granulite-gneiss belts correspond to the activity of plumes expressed in vigorous heating of the continental crust; intraplate magmatism; formation of rift depressions filled with sediments, juvenile lavas, and pyroclastic flow deposits; and metamorphism of lower and middle crustal complexes under conditions of granulite and high-temperature amphibolite facies that spreads over the fill of rift depressions also. Granulite-gneiss complexes of the East European Craton form one of the main components of the large oval intracontinental tectonic terranes of regional or continental rank. Inclusion of the granulite-gneiss complexes from Eastern Europe, North and South America, Africa, India, China and Australia in discussion of the problem indicated in the title to this paper, suggests consideration of a significant change in existing views on the relations between the plate-and plume-tectonic processes in geological history, as well as in supercontinent assembly and decay. The East European and North American cratons are fragments of the long-lived supercontinent Lauroscandia. After its appearance at ~2.8 Ga, the crust of this supercontinent evolved under the influence of the sequence of powerful mantle plumes (superplumes) up to ~0.85 Ga. During this time Lauroscandia was subjected to rifting, partial breakup and the following reconstruction of the continent. The processes of plate-tectonic type (rifting with the transition to spreading and closing of the short-lived ocean with subduction) within Lauroscandia were controlled by the superplumes. Revision of the nature of the granulite-gneiss complexes has led to a fundamental new understanding of: a more important role than envisaged previously for mantle-plume processes in the juvenile additions to the continental crust, especially during the Neoarchaean-Proterozoic; the existence of the supercontinent Lauroscandia from ~2.80 to 0.85 Ga; the leading role of mantle plumes in the interaction of plate-and plume-tectonics in the Neoarchaean-Proterozoic history of Lauroscandia and perhaps of the continental crust as a whole. We propose that the evolution of the geodynamic settings of the Earth's crust origin can be represented as a spiral sequence: the interaction of mantle-plume processes and embryonic microplate tectonics during the Palaeo-Mezoarchaean (~3.8-2.8 Ga) → plume-tectonics and local plume-driven plate-tectonics (~2.80-0.55 Ga) → Phanerozoic plate tectonics along with a reduced role of mantle plumes.Key words: Precambrian; plate-tectonics; plume-tectonics; granulite-gneiss belts; supercontinent; intracontinent oval orogenRecommended by E.V. Sklyarov Аннотация: Ка...

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“…4.14d) and associated tholeiitic pillowed basalts of the Mittrij€ arvi formation have been correlated with the Pilguj€ arvi Volcanic Formation in the Pechenga Greenstone Belt (Smolkin 1995) because of the geochemical similarities of the ferropicrites in these two areas (Fedotov 1983;Predovsky et al 1987;Skuf'in and Theart 2005). The Soleonozero Formation, which occurs beneath rocks of the Mittrij€ arvi formation, and consists of sulphide-carbonaceous schists, phosphorite pebble conglomerates, tuffs and ferropicritic lava breccias, has also been correlated with the Pilguj€ arvi Sedimentary Formation (Smolkin 1995;Sharkov and Smolkin 1997) based on geochemical and lithological similarities. The occurrence of ferropicrites in the Imandra/Varzuga Belt is important not only for correlative purposes but also for ore exploration as those in the Pechenga Greenstone Belt are coeval and comagmatic with gabbro-wehrlite intrusions hosting commercial Ni-Cu ores (e.g.…”

Section: The Tominga Groupmentioning

confidence: 99%

4.1 The Imandra/Varzuga Greenstone Belt

Melezhik

2012

Reading the Archive of Earth’s Oxygenation

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The early Proterozoic Pechenga-Varzuga Belt: a case of Precambrian back-arc spreading

Cited by 55 publications

References 12 publications

3.3 Palaeotectonic and Palaeogeographic Evolution of Fennoscandia in the Early Palaeoproterozoic

3.3 Palaeotectonic and Palaeogeographic Evolution of Fennoscandia in the Early Palaeoproterozoic

Age and isotopic geochemical characteristics of Archean carbonatites and alkaline rocks of the Baltic shield

4.1 The Imandra/Varzuga Greenstone Belt

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