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Evolution of the Belomorian Belt: NORDSIM U-Pb zircon dating of the Chupa paragneisses, magmatism, and metamorphic stages

Bibikova, EV; Bogdanova, Svetlana LU ; Glebovitsky, VA; Claesson, S and Skiold, T (2004) In Petrology 12(3). p.195-210
Abstract
The U-Pb systematics of accessory zircons were studied by secondary ion mass spectrometry (NORDSIM ion microprobe). This study revealed two main age groups of terrigenous zircons, 3000 and 2900 Ma, in the metasedimentary rocks of the Chupa nappe of the Belomorian belt. Zircon older than 3200 Ma was not found, which is consistent with the available Sm-Nd model ages. Older terrigenous zircons (3100-3200 Ma) were found only in the northern part of the belt, which is probably a consequence of the input of Mesoarchean material from the Karelian craton and/or the Kola province. The oldest metamorphic zircons of Belomorian paragneisses were formed 2820 +/- 15 Ma ago. Zircons with an age of 2710 15 Ma provide a record of collisional metamorphism... (More)
The U-Pb systematics of accessory zircons were studied by secondary ion mass spectrometry (NORDSIM ion microprobe). This study revealed two main age groups of terrigenous zircons, 3000 and 2900 Ma, in the metasedimentary rocks of the Chupa nappe of the Belomorian belt. Zircon older than 3200 Ma was not found, which is consistent with the available Sm-Nd model ages. Older terrigenous zircons (3100-3200 Ma) were found only in the northern part of the belt, which is probably a consequence of the input of Mesoarchean material from the Karelian craton and/or the Kola province. The oldest metamorphic zircons of Belomorian paragneisses were formed 2820 +/- 15 Ma ago. Zircons with an age of 2710 15 Ma provide a record of collisional metamorphism of the high-pressure granulite, eclogite, and amphibolite facies, which was completed by several magmatic and migmatitic events 2615 +/- 15 Ma ago. The basic magmatism of 2450-2400 Ma did not produce accessory zircons in the supracrustal complexes of the Belomorian belt. In contrast, the later Svecofennian metamorphism of the amphibolite facies resulted in the reequilibration of the U-Pb isotopic system of sphene and growth of a new zircon generation, especially in the zones of migmatization and pegmatite formation between 1900 and 1800 Ma. Early Proterozoic tectonothermal processes only partially obliterated the record of the Archean history of the Belomorian belt, which does not prevent the reconstruction of Archean tectonic settings. New more accurate isotopic data supported the previously proposed geodynamic model of the evolution of the Belomorian belt. According to this model, its formation occurred under the influence of oceanic crust subduction 2900-2800 Ma ago and subsequent collision with the Karelian craton 2730-2710 Ma ago. (Less)
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author
organization
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Contribution to journal
publication status
published
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in
Petrology
volume
12
issue
3
pages
195 - 210
publisher
MAIK Nauka/Interperiodica
external identifiers
  • wos:000222395500001
  • scopus:3042606234
ISSN
1556-2085
language
English
LU publication?
yes
id
57c79ffc-db1f-4e99-838f-a593a4678cf6 (old id 273432)
alternative location
http://maik.maik.rssi.ru/abstract/petreng/4/petreng3_4p195abs.htm
date added to LUP
2007-10-17 09:02:27
date last changed
2017-11-19 03:39:45
@article{57c79ffc-db1f-4e99-838f-a593a4678cf6,
  abstract     = {The U-Pb systematics of accessory zircons were studied by secondary ion mass spectrometry (NORDSIM ion microprobe). This study revealed two main age groups of terrigenous zircons, 3000 and 2900 Ma, in the metasedimentary rocks of the Chupa nappe of the Belomorian belt. Zircon older than 3200 Ma was not found, which is consistent with the available Sm-Nd model ages. Older terrigenous zircons (3100-3200 Ma) were found only in the northern part of the belt, which is probably a consequence of the input of Mesoarchean material from the Karelian craton and/or the Kola province. The oldest metamorphic zircons of Belomorian paragneisses were formed 2820 +/- 15 Ma ago. Zircons with an age of 2710 15 Ma provide a record of collisional metamorphism of the high-pressure granulite, eclogite, and amphibolite facies, which was completed by several magmatic and migmatitic events 2615 +/- 15 Ma ago. The basic magmatism of 2450-2400 Ma did not produce accessory zircons in the supracrustal complexes of the Belomorian belt. In contrast, the later Svecofennian metamorphism of the amphibolite facies resulted in the reequilibration of the U-Pb isotopic system of sphene and growth of a new zircon generation, especially in the zones of migmatization and pegmatite formation between 1900 and 1800 Ma. Early Proterozoic tectonothermal processes only partially obliterated the record of the Archean history of the Belomorian belt, which does not prevent the reconstruction of Archean tectonic settings. New more accurate isotopic data supported the previously proposed geodynamic model of the evolution of the Belomorian belt. According to this model, its formation occurred under the influence of oceanic crust subduction 2900-2800 Ma ago and subsequent collision with the Karelian craton 2730-2710 Ma ago.},
  author       = {Bibikova, EV and Bogdanova, Svetlana and Glebovitsky, VA and Claesson, S and Skiold, T},
  issn         = {1556-2085},
  language     = {eng},
  number       = {3},
  pages        = {195--210},
  publisher    = {MAIK Nauka/Interperiodica},
  series       = {Petrology},
  title        = {Evolution of the Belomorian Belt: NORDSIM U-Pb zircon dating of the Chupa paragneisses, magmatism, and metamorphic stages},
  volume       = {12},
  year         = {2004},
}