Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Maraconai

stripes

Occurrence number: 
025-00-009
Country: 
Brazil
Region: 
Para
Location: 
Longitude: -53.37, Latitude: -0.55
Carbonatite: 
No

Maraconai comprises two oval-shaped intrusions emplaced in metamorphic rocks of the Vila Nova Group, the larger of some 25 km2, the smaller about 8 km2. Both intrusions are deeply weathered to laterite which shows high anomalies for Zr, Ni, Cr, V and Ta. The petrography is unknown but the underlying rocks are likely to be ultramafic and alkaline.

References: 
ISSLER, R.S., ANDRADE, A.R.F. de, MONTALVAO, R.M.G. de, GUIMARAES, G., SILVA, G.G. da and LIMA, M.I.C. de, 1974. DNPM Projeto Radambrasil. Folha SA.22 Belem. Levantamento de Recursos Naturais, Geologia, 5. 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