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Geochronology of Precambrian granites and associated U-Ti-Th mineralization, northern Olary province, South Australia

January 1, 1984

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.

Publication Year 1984
Title Geochronology of Precambrian granites and associated U-Ti-Th mineralization, northern Olary province, South Australia
DOI 10.1007/BF00373676
Authors K. R. Ludwig, J.A. Cooper
Publication Type Article
Publication Subtype Journal Article
Series Title Contributions to Mineralogy and Petrology
Index ID 70014046
Record Source USGS Publications Warehouse