The 1982 eruptions of El Chichón Volcano, Chiapas, Mexico: Mineralogy and petrology of the anhydritebearing pumices

@article{Luhr1984The1E,
  title={The 1982 eruptions of El Chich{\'o}n Volcano, Chiapas, Mexico: Mineralogy and petrology of the anhydritebearing pumices},
  author={J. Luhr and I. Carmichael and J. Varekamp},
  journal={Journal of Volcanology and Geothermal Research},
  year={1984},
  volume={23},
  pages={69-108}
}
The 1982 eruptions of El Chichon Volcano produced three major pumice- and ash-fall layers. Fresh pumices from the three layers are indistinguishable porphyritic trachyandesites with 55.9 wt. % SiO2, 2.2% MgO, 2.8% K2O, 0.4% P2O5, and over 1.2% SO3. The pumices contain 58 wt. % crystals dominated by plagioclase (mode An43) and hornblende, with lesser amounts of augite, titanomagnetite, anhydrite, apatite, sphene, pyrrhotite, and biotite enclosed in a vesiculated matrix glass with 68 wt. % SiO2… Expand
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