MINERAL CHEMISTRY OF KAMAFUGITES AND RELATED ROCKS FROM THE ÁGUAS EMENDADAS REGION, GOIÁS STATE

TEREZA CRISTINA JUNQUEIRA-BROD, JOSÉ AFFONSO BROD, SALLY A. GIBSON, ROBERT N. THOMPSON

Resumo


In the Águas Emendadas Region, Goiás State, Brazil, Late Cretaceous alkaline magmatism produced a series of diatreme structures of kamafugitic affinity. These occurrences consist of a central breccia body, surrounded by lavas and intruded by dykes. Compositionally, the rocks vary from kamafugites, through melaleucitites and leucitites to basanites. The results of mineral chemistry study of olivine, clinopyroxene, feldspathoids, feldspars, perovskite, opaque minerals and carbonates confirms the kamafugitic character of the studied rocks and suggests a link with carbonatite magmatism.


Palavras-chave


Kamafugite; Carbonatite; Kalsilite; Diatreme.

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