Time-space relationships between late Quaternary rhyolitic and andesitic volcanism in the southern Taupo volcanic zone, New Zealand

Abstract

About 9,800 yr ago a major pulse of andesitic volcanism lasting about 100 yr began in the Tongariro volcanic center at the southern end of the Taupo volcanic zone in North Island, New Zealand. Immediately following the onset of this intense period of andesitic volcanism, two voluminous rhyolitic eruptions from the Taupo volcanic center, located a few kilometres northeast of the Tongariro volcanic center, occurred after a period of quiescence of about 10,000 yr. The andesite volcanism marks a change in composition of titanomagnetite, which shows lower vanadium, chromium, cobalt, and nickel contents when compared with older andesites. Titanomagnetites analyzed from fresh rhyolite lapilli erupt..