Refined Proterozoic evolution of the Gawler Craton, South Australia, through U-Pb zircon geochronology
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Abstract
Through the application of both conventional U-Pb zircon analyses and small-sample U-Pb isotopic analyses, the nature and timing of tectonic events leading to the formation of the Gawler Craton have been defined more precisely. Constraints on deposition of Early Proterozoic iron formation-bearing sediments have been narrowed down to the period 1960-1847 Ma. Deformed acid volcanics, including the economically important Moonta Porphyry, have zircon ages of ∼ 1790 and 1740 Ma. The voluminous acid Gawler Range Volcanics and correlatives to the east were erupted over a short interval at 1592 ± 2 Ma, and were intruded by anorogenic granites at ∼ 1575 Ma. Small-sample zircon analyses proved to be an extremely valuable adjunct to conventional analyses, generally yielding more-concordant data which forced a curved discordia through an upper intercept slightly younger than from a conventional straight-line discordia.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Refined Proterozoic evolution of the Gawler Craton, South Australia, through U-Pb zircon geochronology |
| Series title | Precambrian Research |
| DOI | 10.1016/0301-9268(88)90076-9 |
| Volume | 40-41 |
| Year Published | 1988 |
| Language | English |
| Publisher | Elsevier |
| Description | 24 p. |
| First page | 363 |
| Last page | 386 |
| Country | Australia |
| Other Geospatial | South Australia |