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1214 ± 5 Ma dyke from the Darling Range, southwestern Yilgarn Craton, Western Australia

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High thorium euhedral, twinned and elongate zircons from the felsic part of a mafic dyke located in the Archaean Yilgarn Craton approximately 30 km northeast of Perth and approximately 2 km east of the Darling Fault, have consistent 207 Pb/ 206 Pb ages of 1214 ± 5 Ma. This age is interpreted as the age of dyke emplacement and is identical, within the uncertainties, with other U–Pb dyke ages reported for the southwest Yilgarn Craton. The present result extends the known occurrence of ca 1210 Ma dykes to the western margin of the Yilgarn Craton and confirms earlier conclusions that a major mafic dyke emplacement occurred throughout the southern Yilgarn Craton during a short‐lived magmatic pulse at ca 1210 Ma.
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Keywords: Mesoproterozoic; SHRIMP; Yilgarn Craton; dolerite; dyke; uranium‐lead dating; zircon

Document Type: Research Article

Affiliations: Department of Applied Geology, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia

Publication date: October 1, 2003

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