Age constraints on the geological evolution of the Narryer Gneiss Complex, Western Australia
作者:
P. D. Kinny,
J. R. Wijbrans,
D. O. Froude,
I. S. Williams,
W. Compston,
期刊:
Australian Journal of Earth Sciences
(Taylor Available online 1990)
卷期:
Volume 37,
issue 1
页码: 51-69
ISSN:0812-0099
年代: 1990
DOI:10.1080/08120099008727905
出版商: Taylor & Francis Group
关键词: 40Ar/39Ar dating;Narryer Gneiss Complex;Yilgarn Craton;zircon dating
数据来源: Taylor
摘要:
Zircon U‐Th‐Pb and mineral K‐Ar and40Ar/39Ar isotopic studies indicate that the maximum deposition age of the Mt Narryer quartzite (which contains detrital zircons up to 4200 Ma old) is 3280 Ma, or by association with other sequences possibly 3100 Ma. This postdates a major episode of high‐grade metamorphism, granite emplacement and deformation at 3300 Ma, which affected adjacent gneiss terranes and which previously had been considered to have affected metasediments and basement gneisses alike. Prograde metamorphism of the Narryer metasediments to amphibolite facies evidently took place during a younger event culminatingca2700 Ma, prior to injection of granite sheetsca2650 Ma in age, by which time the present tectonic framework had been assembled.
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