On the metamorphic history of an Archaean granitoid greenstone terrane, East Pilbara, Western Australia, using the (Ar-40)/(Ar-39) age spectrum technique

Details On the metamorphic history of an Archaean granitoid greenstone terrane, East Pilbara, Western Australia, using the (Ar-40)/(Ar-39) age spectrum technique On the metamorphic history of an Archaean granitoid greenstone terrane, East Pilbara, Western Australia, using the (Ar-40)/(Ar-39) age spectrum technique

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84..226w&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 84, no. 2-3, July 1987, p. 226-242. Research supported by the Austral

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7

Geochronology, Granite, Metamorphic Rocks, Radioactive Age Determination, Argon Isotopes, Australia, Batholiths, Gneiss, Muscovite, Tectonics

Scientific paper

Age spectrum analyses of blue-green hornblendes from amphibolites from the Western Shaw Belt, East Pilbara, Western Australia, indicate an age of at least 3200 Myr for early regional metamorphism. Ages on hornblende and muscovite from the narrow contact zone with the adjacent Yule Batholith probably date updoming of the granitoid gneiss terranes at 2950 Myr. Hornblendes from within the Shaw Batholith and from a contact zone of a posttectonic granitoid yield ages of 2840-2900 Myr, indicating either prolonged high temperatures within the granitoid gneiss terranes or a separate thermal pulse associated with the intrusion of posttectonic granitoids. The preservation of very old hornblendes in a narrow greenstone belt surrounded by massive granitoid gneiss domes indicates that remarkable contrasts in metamorphic geotherms existed over short distances during the Late Archaean, suggesting that updoming occurred during a period of rapid tectonism.

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