Butera, K M; Williams, Ian; Blevin, P; Simpson, C J
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...[Show more]
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