Some physical properties of rocks in the East Cape-Mahia Peninsula Region, North Island, New Zealand

Abstract

Examination of the density variations found in cores taken from wildcat wells highlights the differences in Tertiary sedimentation on the east and west coasts of the North Island of New Zealand. A number of measurements of density, magnetic susceptibility, and longitudinal wave velocity have been made on East Coast rock outcrops. The results, although far from comprehensive, reveal some new and interesting trends. Comparisons of New Zealand seismic measurements and North American oil-well data throw new light on the rock-forming processes of diagenesis and burial metamorphism and allow comparisons to be made of the differences in tectonic environment between New Zealand and North America.