Serra de Agua de Pau, São Miguel, Ilhas dos Açores, Portugal
Peralkaline syenites ejecta within a Plinian fall deposit.
These syenites are derived from solidification zones around the margin of the parental trachyte magma chamber.
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References
- Osann, A. (1888): Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130
- Cann, J.R. (1967): A second occurrence of dalyite and the petrology of some ejected syenite blocks from Sao Miguel, Azores. Min. Mag. 36, 227-232.
- Booth, B., Croasdale, R., Walker, G.P.L. (1978): A quantitative study of five thousand years of volcanism on Sao Miguel, Azores. Philosophical transactions of the Royal Society of London, Vol. 288, No. 1352, 271-319.
- M. Storey, J. A. Wolff, M. J. Norry and G. F. Marriner (1989): Origin of hybrid lavas from Agua de Pau volcano, Sao Miguel, Azores. Geological Society, London, Special Publications 42, 161-180.
- Ternes, B. (1999): Mineralien von der Azoreninsel Sao Miguel (Portugal). Lapis, 24 (1), 20-42.
- Ridolfi, F., Renzulli, A., Santi, P. and Upton, B. G. J. (2003): Evolutionary stages of crystallisation of weakly peralkaline syenites: evidence from ejecta in the plinian deposits of Agua de Pau volcano (São Miguel, Azores Islands). Min. Mag. 67, 749-767.
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