Authors / CoAuthors
Black, L.P. | Shaw, R.D. | Stewart, A.J.
Abstract
Rb-Sr data reveal a long and complex Proterozoic history for the Arunta Inlier of central Australia. The first event was a widespread, dominantly granulite-facies episode, known as the Strangways Event, at 1790 ± 35 Ma. Five relatively precise ages from metamorphic and granitic rocks give an estimate between 1650 and 1700 Ma for widespread deformation and metamorphism during the Aileron Event. Two granites in the northern Arunta Inlier were probably emplaced at about 1500 m.y. Deformation and low-grade metamorphism during the Anmatjira Event are dated by generally imprecise isochrons at about 1400 Ma. Four isochrons, documenting both primary events and resetting, are in accord with an age of 900-1050 Ma for the Ormiston Event. The Rb-Sr data do not define the time of initial crust formation in the Arunta Inlier.
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document
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81141
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Keywords
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- GA PublicationJournal
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- NT
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_External
Publication Date
1983-01-01T00:00:00
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geoscientificInformation
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BMR Journal of Australian Geology and Geophysics 8:2:129-137
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[-25.0, -19.0, 130.0, 137.0]
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