Mathematics – Logic
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..68..221b&link_type=abstract
Earth and Planetary Science Letters, Volume 68, Issue 2, p. 221-228.
Mathematics
Logic
20
Scientific paper
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 +/- 38 Ma 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.
Allaart J. H.
Baadsgaard Halfdan
Bridgwater David
McGregor V. R.
Nutman Allen P.
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