The densities of New Zealand rocks

Previous stratigraphic and tectonic studies of Coromandel Peninsula, New Zealand, have defined regionally significant structures, including calderas, of Miocene age. A new gravity map of the area reveals significant details not seen in the earlier geophysical surveys. Results from a new low-level aeromagnetic survey and from two new magnetotelluric resistivity soundings help interpret the volcanic structures. 2-D/2.5-D models are used to visualise the internal structure.

Section: Regional and Residual Gravity Fieldsmentioning

confidence: 80%

Geophysical characterisation of large silicic volcanic structures in the Coromandel Peninsula, New Zealand

Malengreau

Skinner

Bromley

et al. 2000

“…The magnetisation assumed in the model is 2,4 A/m, a value consistent with the measured magnetic susceptibilities of rocks of the Anglem and Longwood-Bluff complexes (Hatherton 1966b). The assumed density contrast for the model is +0'2 Mg/m" compared with a measured contrast of 0'15 Mg/m 3 between Anglem Complex and Fiordland granites (Hatherton & Leopard 1964).…”

Section: Stewart Island Negative Anomalymentioning

confidence: 96%

Magnetic anomalies over southern New Zealand

Woodward¹,

Hatherton²

1975

Self Cite

“…3. The data have been published in tables 1 and 2 of Hatherton and Leopard (1964). The graphical presentation of Fig.…”

Section: The Densities Of New Zealand Rocksmentioning

confidence: 99%

“…The oldest rocks (Um-Uk) have also been rearranged using the results obtained in the dry density measurements. These range from 2·39 g/ cm 3 to 2·66 gj cm 3 and form three distinct dry density groups distinguished as A, B, and C. The first group, A, consists of 12 rocks whose Hatherton and Leopard, 1964) and Matawai rock del"!sities.…”

Section: The Densities Of New Zealand Rocksmentioning

confidence: 99%

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

Garrick

1969

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.