Zircon U-Pb dating of early palaeozoic monzonitic intrusives from the Goonumbla area, New South Wales

K. M. Butera, I. S. Williams*, P. L. Blevin, C. J. Simpson

*Corresponding author for this work

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

Zircon U-Pb ages measured on four small intrusions into the succession of Ordovician volcanic rocks that hosts Northparkes Cu-Au mine northwest of Parkes, New South Wales, place limits on the age of the volcanic sequence. The basal Nelungaloo Volcanics are constrained by a cross-cutting monzodiorite to be ≥484.3 ± 2.9 Ma (Early Ordovician). Similarly, the overlying basal Goonumbla Volcanics are constrained by another cross-cutting monzodiorite to be ≥450.8 ± 4.2 Ma (Middle Ordovician). A later generation of monzonites intruded into the middle and upper Goonumbla Volcanics yield ages of 439.1 ± 4.5 and 438.9 ± 4.7 Ma (Siluro-Ordovician). These various ages are consistent with the ages of fossiliferous sediments within the volcanic sequence, and indicate that both the intrusive and volcanic rocks span an appreciable period of time--neither are the product of a single magmatic episode. Intrusion of the youngest monzonites and mineralisation was virtually contemporaneous.

Original languageEnglish
Pages (from-to)457-464
Number of pages8
JournalAustralian Journal of Earth Sciences
Volume48
Issue number3
DOIs
Publication statusPublished - 2001
Externally publishedYes

Keywords

  • Endeavour 26
  • Geochronology
  • Goonumbla
  • Monzodiorite
  • Monzonite
  • Northparkes
  • Zircon

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