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The age of the Telfer Au-Cu deposit and its relationship with granite emplacement, Paterson Province, Western Australia

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Created 13/01/2025

Updated 13/01/2025

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Dating of granites from the Telfer Region of the Paterson Province shows that felsic magmatism took place between ca. 645 Ma and ca. 605 Ma, with clusters at ca. 645, and ca. 630 and a single granite at 605 Ma (the O'Callaghans Granite). This magmatism is interpreted to be a result of deformation and crustal thickening associated with the Miles Orogeny, the first major compressional deformation to affect the Neoproterozoic sedimentary rocks of the Yeneena Basin. Dating of monazite and xenotime from Au-bearing veins at the Telfer Mine show that early concordant vein mineralisation took place at 652 ± 7 Ma, while a late-stage discordant vein yielded an age of 645 ± 7 Ma. These dates indicate that mineralisation took place over a relatively restricted period of time, at a similar time to the emplacement of the earliest granites of the Miles Orogeny, and was apparently unrelated to magmatism at ca. 630 Ma and ca. 605 Ma. Although there is a close temporal relationship between the early granites and Au mineralisation, the lack of a close spatial association suggests that it is possible that granite emplacement was not directly involved in the mineralising system, but was instead a separate consequence of deformation associated with the Miles Orogeny. If this was the case, then other parts of the Yeneena Basin affected by the Miles Orogeny, but not intruded by granites, could be prospective for lode-Au mineralisation.

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Title The age of the Telfer Au-Cu deposit and its relationship with granite emplacement, Paterson Province, Western Australia
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/f2bd2ad7-176a-488a-a46a-134883319545
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[121.25, -23.17], [123.33, -23.17], [123.33, -20.5], [121.25, -20.5], [121.25, -23.17]]]}
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