Magnetic modelling and interpretation of the Hay–Booligal Zone and its basement

Abstract

Little is known about the basement of the Hay–Booligal Zone (located in NSW). Magnetic modelling of long wavelength anomalies within the Hay–Booligal Zone indicates that the Hay–Booligal basement consists of serpentinised ultramafic material at depths of 6 to 12 km. This supports interpretation that the Hay–Booligal basement could be similar to the Selwyn Block in Victoria and rather than a crystalline microcontinent. Also, interpretation of short wavelength semi-parallel TMI anomalies near the previous boundary of the Hay–Booligal Zone has lead to the adjusted the boundary of the Hay–Booligal and Bendigo zones.