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Tephriphonolite or tephri-phonolite is a mafic to intermediate extrusive igneous rock in composition between phonotephrite and phonolite. It contains 9–14% alkali content and 48–57% silica content (see TAS diagram). Tephriphonolite is roughly equivalent to tephritic phonolite of the QAPF classification.

Tephriphonolite has been found, for example, at Colli Albani volcano in Italy and in the Asunción Rift of Paraguay.

References

1. "Unusual Lava Types". Strongly Alkaline Lavas. San Diego State University. Archived from the original on 2020-11-05. Retrieved 2016-09-11.
2. Bailey, Roy A. (2004). "Eruptive History and Chemical Evolution of the Precaldera and Postcaldera Basalt-Dacite Sequences, Long Valley, California: Implications for Magma Sources, Current Seismic Unrest, and Future Volcanism". United States Geological Survey: 17. {{cite journal}}: Cite journal requires |journal= (help)
3. Le Maitre, R.W. (editor) (2002). Igneous Rocks — A Classification and Glossary of Terms (2nd ed.). Cambridge: Cambridge University Press. p. 32. ISBN 0-521-66215-X. {{cite book}}: |author= has generic name (help)
4. Campagnola, S.; Vona, A.; Romano, C.; Giordano, G. (2016). "Crystallization kinetics and rheology of leucite-bearing tephriphonolite magmas from the Colli Albani volcano (Italy)". Chemical Geology. 424. Elsevier: 12–29. Bibcode:2016ChGeo.424...12C. doi:10.1016/j.chemgeo.2016.01.012.
5. Velázquez, V.F.; Riccomini, C.; de Barros Gomes, C.; Kirk, J. (2011). "The Cretaceous Alkaline Dyke Swarm in the Central Segment of the Asunción Rift, Eastern Paraguay: Its Regional Distribution, Mechanism of Emplacement, and Tectonic Significance". Journal of Geological Research. 2011: 1–18. doi:10.1155/2011/946701.

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