Alkaline Rocks and Carbonatites of the World

Funded by HiTech AlkCarb - New geomodels to explore deeper for Hi-Tech critical raw materials in Alkaline rocks and Carbonatites

Maicuru

stripes

Occurrence number: 
025-00-007
Country: 
Brazil
Region: 
Para
Location: 
Longitude: -54.23, Latitude: 0.5

Maicuru forms a circular hill within rocks of the Guyana Shield and is capped with lateritic deposits. On morphological and structural grounds it is considered to be an ultrabasic alkaline intrusion, probably with associated carbonatite. Analyses of laterite give high values for TiO2 (8-30%), Cr and V. An air photograph is given in Araujo et al. (1976, p. 115).

Economic: 
Laterites have been investigated chemically (Issler et al. 1975, Tables III-IV).
References: 
ARAUJO, J.F.V., MONTALVAO, R.M.G. de, LIMA, M.I.C. de, FERNANDES, P.E.C.A., CUNHA, F.M.B. da, FERNANDES, C.A.C. and BASEI, M.A.S. 1976. DNPM. Projeto Radambrasil. Folha SA.21 Santarem. Levantamento de Recursos Naturais, Geologia, 10: 1-122. ISSLER, R.S., LIMA, M.I.C. de, MONTALVAO, M.B.G. de and SILVA, G.G. da, 1975. Intrusivas feldspatoididas no Craton Guianes. Congresso Ibero-Americano de Geologia Economica, II: 363-82
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