Quaternary acid magma in New Zealand

@article{Ewart1975QuaternaryAM,
  title={Quaternary acid magma in New Zealand},
  author={A. Ewart and W. Hildreth and I. Carmichael},
  journal={Contributions to Mineralogy and Petrology},
  year={1975},
  volume={51},
  pages={1-27}
}
AbstractThe voluminous Pleistocene—Recent Taupo rhyolites typically contain phenocrysts of plagioclase (oligoclase-labradorite), quartz, titanomagnetite, ilmenite, and ferromagnesian silicates. Ferromagnesian assemblages correlate with well defined Fe-Ti oxide equilibration temperature ranges and allow the rhyolites to be subdivided as follows: (1) Cummingtonite (c)—calcic hornblende (hb)—orthopyroxene (opx); 725–755°C, (2) Hb-opx, 750–825°C, (3) Biotite-hb-(c-opx), 720–765°C, (4) Opx… Expand
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The nature of primary rhyolitic magmas involved in crustal evolution: Evidence from an experimental study of cummingtonite-bearing rhyolites, Taupo Volcanic Zone, New Zealand☆
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References

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