Abstract
This work focuses on the kamafugites from Santo Antônio da Barra, Minas–Goiás Alkaline Province. These rocks contain olivine, clinopyroxene, titanomagnetite, perovskite, leucite (pseudomorphs), kalsilite, nepheline, and phlogopite. The rocks investigated are ultrabasic, with high contents of CaO, FeO, and TiO 2, high to moderate contents of Al 2O 3, alkalis, and P 2O 5, and low contents of MgO. The alkaline characteristic of the rocks is reflected in TiO 2, K 2O, and Na 2O contents and in the frequent presence of normative nepheline and leucite. K 2O contents are not primary since most of the leucite was replaced by analcime. The negative K anomaly verified in the extended incompatible element distribution diagram for kamafugites seems to be mainly related to alteration. Kamafugites are characterized by a marked enrichment in incompatible and large ion lithophile elements together with other typical compatible elements. The Santo Antônio da Barra kamafugites are less enriched in titanium, niobium, zirconium, and REE than the Mata da Corda and most of the Toro-Ankole ones. San Venanzo–Cupaello rocks have much lower titanium contents.
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