Negative total-intensity magnetic anomalies in the southeast of south Australia

Abstract

The total magnetization vector of two magnetic anomalies associated with Tertiary basalt intrusions in the southeast of South Australia is determined to have a very steep reverse dip given by D = 0°, relative to magnetic north, and I = 60°. It was assumed that the intrusions are in a vertical plane and the direction of remanent magnetization and the Konigsberger ratios of the two intrusions are the same. The direction is consistent with the results of a paleomagnetic survey made by Irving and Green of associated, but slightly older, basalts in Victoria, Australia.