| Abstract: | The Mount Boreas-type granite and spatially associated syenitic granitoid of Western Australia yield Pb/Pb ages of 2370+ or -100Ma and 2760+ or -210Ma, respectively. Th/Pb ages, although less precise, are concordant with these ages, and therefore the apparent ages are interpreted to be the crystallisation ages for these two units. U/Pb ages are variable and for the most part anomalously old, which suggests a Cainozoic uranium loss. However, this loss is generally small (<3mu g/g); therefore, neither granitoid in its fresh state provides a good source for nearby calcrete-hosted uranium deposits. The possibility remains that the Mount Boreas- type granite that has been completely weathered during the Tertiary could have been a source for the calcrete-type uranium deposits in W.A. Although the Mount Boreas-type granite is highly fractionated, it does not bear a strong geochemical imprint of a sedimentary precursor. This feature contrasts it with apparently fresh granitoids from other parts of the world that have lost large amounts of uranium (approx 20mu g/g) and are associated with large roll-type and other low temperature-type uranium deposits.-Authors |
| Genre: | Article |
| ProdID: | 70011762 |
| Citation Author: | Stuckless, J. S.; Bunting, J. A.; Nkomo, I. T. |
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| Citation End Page: | 375 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal Geological Society of Australia |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | U-Th-Pb systematics of some granitoids from the northeastern Yilgarn Block, Western Australia and implications for uranium source rock potential.; 1981; Article; Journal; Journal Geological Society of Australia; Stuckless, J. S.; Bunting, J. A.; Nkomo, I. T. |
| Citation Start Page: | 365 |
| Citation Volume: | 28 |
| Citation Year: | 1981 |
| Type: | citation/reference |
| Text: | U-Th-Pb systematics of some granitoids from the northeastern Yilgarn Block, Western Australia and implications for uranium source rock potential.; 1981; Article; Journal; Journal Geological Society of Australia; Stuckless, J. S.; Bunting, J. A.; Nkomo, I. T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1981 00:00 -0600 |
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