SHRIMP U – Pb depositional age for the lower Hardey Formation: evidence for diachronous deposition of the lower Fortescue Group in the southern Pilbara region, Western Australia
Author: Hall, CE1
Source: Australian Journal of Earth Sciences, Volume 52, Number 3, June 2005 , pp. 403-410(8)
Publisher: Taylor and Francis Ltd
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Abstract:
A SHRIMP zircon U – Pb age is reported for the Hardey Formation, lower Fortescue Group in the southern Pilbara region of Western Australia. Zircons extracted from an accretionary lapilli-bearing siltstone of the Hardey Formation give a 207 Pb/ 206 Pb age of 2750 ± 5 Ma ( n = 36), which is regarded as an age of felsic volcanism contemporaneous with deposition of the Hardey Formation. Published zircon ages, primarily on felsic intrusives within the Hardey Formation in the northern Pilbara are statistically significantly different, and older than the age of ca 2750 Ma presented here, suggesting that a diachronous surface existed across the Pilbara Craton during deposition of the Hardey Formation.Keywords: diachronous; Fortescue Group; geochronology; Hardey Formation; SHRIMP; Western Australia; uranium – lead dating; zircon
Document Type: Research article
DOI: 10.1080/08120090500134506
Affiliations: 1: Tectonics Special Research Centre, School of Earth and Geographical Sciences, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia
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