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The zircon geochronology of the Akilia association and Isua supracrustal belt, West Greenland

Authors
Journal
Earth and Planetary Science Letters
0012-821X
Publisher
Elsevier
Publication Date
Volume
68
Issue
2
Identifiers
DOI: 10.1016/0012-821x(84)90154-7
Disciplines
  • Earth Science

Abstract

Abstract The Akilia association and the Isua supracrustal belt are interpreted as both derived from a single volcano-sedimentary sequence because they occupy the identical position in local stratigraphic sequences, show a similar association of lithologies and are both intruded by geologically and geochronologically-correlated orthogneisses. Zircon from the Akilia association yields a concordia intersection age of 3587 ± 38Ma while that from the Isua supracrustal belt gives 3813 −14 +21 Ma. The Isua supracrustal date is close to the original age of crystallisation of the zircon, while the Akilia intercept age results from the resetting of the zircon date by granulite facies metamorphism close to 3600 Ma ago.

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