| Gomes, Celso de Barros, Azzone, Rogério Guitarrari, Rojas, Gaston Eduardo Enrich, Guarino, Vincenza, Ruberti, Excelso (2021) Agpaitic Alkaline Rocks in Southern Brazilian Platform: A Review. Minerals, 11 (9) 934 doi:10.3390/min11090934 | Journal (article/letter/editorial) | southern Brazil and at the border between Brazil and Paraguay. All the Brazilian agpaitic rocks are Late Cretaceous...titanite, whereas the agpaitic types contain aenigmatite, astrophyllite, eudialyte, lamprophyllite, F-disilicates...K-Ar) phonolite sill late-magmatic [29–31] 9 Cerro Siete Cabezas 244–249 Ma (K-Ar) nepheline syenite...stock late-magmatic to deuteric [32–34] 10 Cerro Boggiani 241–248 Ma (K-Ar, Ar-Ar) phonolite lava flow...F-disilicates, astrophyllitegroup minerals or aenigmatite crystallization, depends upon peralkalinity, | | | Book | Part 1: North and South America Alan R. Woolley Department of Mineralogy British Museum (Natural History)............................................ 205 Paraguay ................................................and correcti ng text and by making various of Paraguay was generously furnished by J . 1 -1 . Palmieri...phenocrysts o f aegirine, aegir ine--augi te and aenigmatite, and these phases, together with arfvedsoni te...intersti tial quartz and poi kilitic arfvedsonite, aenigmatite and aegirine, and sparse opaques. A caldera then |
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