Ngauruhoe in the Taupo Volcanic Zone, produced andesite flows in 19 and avalanche deposits in 1975.
Potassium-argon “dating” of five of these flows and deposits yielded K-Ar model “ages” from Ar* content.
Ruapehu (about 12 km to the south), Ngauruhoe is an imposing, almost perfect cone that rises more than 1000 m above the surrounding landscape.
It is estimated that a minimum bulk volume of 3.4 million m of pyroclastic material was erupted in the seven-hour eruption sequence on that day.51 Fig. However, the temperature of these fumaroles in the crater floor has steadily cooled significantly since 1979, suggesting that the main vent is becoming blocked.
Field work and collection of samples was undertaken in January 1996.
503–525 (1998), and is reproduced here with the permission of the Creation Science Fellowship of Pittsburgh ( Ngauruhoe is an andesite stratovolcano of 2291 m elevation, rising above the Tongariro volcanic massif within the Tongariro Volcanic Center of the Taupo Volcanic Zone, North Island, New Zealand (fig.
1).12 Though not as well publicized as its neighbor, Mt.
1) and is up to 50 km wide in the central part, narrowing northward and southward. Ngauruhoe in the Taupo Volcanic Zone (TVZ), New Zealand, showing the main structural features.