Archean protoliths within early Proterozoic granulitic crust of the West European Hercynian Belt; possible relics of the West African Craton

Two major events of crustal growth and high-grade metamorphism were suggested by U-Pb and Sm-Nd studies of four granulites from the Bay of Biscay, Spain. The first is Archaean (2700 m.y.) and the second, early Proterozoic (1900 m.y.). The 2700 m.y. orthogneiss protolith age from this area is the fir...

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Bibliographic Details
Published in:Geology (Boulder) 1989-03, Vol.17 (3), p.241-244
Main Authors: Guerrot, C, Peucat, J. J, Capdevila, R, Dosso, L
Format: Article
Language:English
Subjects:
absolute age
Africa
Archean
Atlantic Ocean
Bay of Biscay
crust
dates
dredged samples
Europe
facies
France
genesis
geochemistry
geochronology
Geology
gneisses
grade
granulite facies
granulites
high-grade metamorphism
igneous and metamorphic rocks
metamorphic rocks
metamorphism
microplates
Neoproterozoic
nesosilicates
North Atlantic
orthogneiss
orthosilicates
Pb/Pb
Petrology
plate tectonics
Precambrian
Proterozoic
protoliths
silicates
Sm/Nd
U/Pb
upper Precambrian
Variscan Orogeny
West African Shield
Western Europe
zircon
zircon group
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Summary:Two major events of crustal growth and high-grade metamorphism were suggested by U-Pb and Sm-Nd studies of four granulites from the Bay of Biscay, Spain. The first is Archaean (2700 m.y.) and the second, early Proterozoic (1900 m.y.). The 2700 m.y. orthogneiss protolith age from this area is the first direct evidence of Archaean crust involved in the Hercynian belt. Major events at 2700, 1800 and 600 m.y. in the Hercynian belt suggest that European Precambrian microplate(s) were part of the west African craton, where the same sequence of events is observed.
ISSN:0091-7613
1943-2682
DOI:10.1130/0091-7613(1989)017<0241:APWEPG>2.3.CO;2