Alkaline Rocks and Carbonatites of the World

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Caiapo

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Occurrence number: 
025-00-044
Country: 
Brazil
Region: 
Goias
Location: 
Longitude: -51.75, Latitude: -16

An oval-shaped intrusion of 1.8x1.4 km cuts Devonian sandstones of the Furnas Formation and is covered with a lateritic soil averaging 55 m in thickness. The principal rock types are carbonatites, carbonatitic breccias, ijolite, monchiquite and silexite. Fenites take the form of albitites and syenitic breccias. The principal carbonatite is beforsite, but sovite and ferrocarbonatite are also present, composed of dolomite, calcite, ankerite and siderite and including baryte, opaques, rutile, pyrochlore and RE minerals.

Economic: 
Anomalously high values for Sr, Ba and REE occur in the lateritic cover.
Age: 
Post-Devonian.
References: 
RODRIGUES, C. de S. and LIMA, P.R.A. dos S. 1984. Carbonatitic complexes in Brazil. Companhia Brasileira de Metalurgia e Mineracao: 1-17
Fig. 196 The Ipora Group of occurrences of alkaline intrusions of central Goias.
Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith