Geochronology of Precambrian granites and associated U-Ti-Th mineralization, northern Olary province, South Australia
Contributions to Mineralogy and Petrology
By: K.R. Ludwig and J.A. Cooper
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Abstract
Proterozoic granitoids and metamorphic rocks in the Olary province of the Willyama block of South Australia host ore-grade amounts of U-Th-Ti and U-Fe-Ti-Th minerals. U-Pb-Th isotope analyses on zircons from all granitoids associated with the Crocker Well brannerite deposit indicate that these granitoids were intruded within a short time span, close to the 1579.2??1.5 m.y. age of the brannerite-bearing host-rock. Though the early Paleozoic Delamerian orogeny was intense in this region, the zircon isotopic systems remained unaffected; rather, the best-defined zircon chords on concordia plots show a welldefined lower intercept of 43.8??6.5 Ma, which can only be associated with early Tertiary block faulting. Pb-U-Th isotope analyses on brannerite from the Crocker Well deposit and davidite from the Mt. Victoria deposit and the Radium Hill deposit yield badly scattered and discordant apparent ages that suggest a primary age at least as old as the age of the Crocker Well granitoids, followed by a severe disturbance in the early Paleozoic. ?? 1984 Springer-Verlag.
Suggested Citation
Ludwig, K., and Cooper, J., 1984, Geochronology of Precambrian granites and associated U-Ti-Th mineralization, northern Olary province, South Australia: Contributions to Mineralogy and Petrology, v. 86, no. 3, p. 298-308, https://doi.org/10.1007/BF00373676.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Geochronology of Precambrian granites and associated U-Ti-Th mineralization, northern Olary province, South Australia |
| Series title | Contributions to Mineralogy and Petrology |
| DOI | 10.1007/BF00373676 |
| Volume | 86 |
| Issue | 3 |
| Year Published | 1984 |
| Language | English |
| Publisher location | Springer-Verlag |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Contributions to Mineralogy and Petrology |
| First page | 298 |
| Last page | 308 |