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

Campos Do Jordao

stripes

Occurrence number: 
025-00-091
Country: 
Brazil
Region: 
Sao Paulo
Location: 
Longitude: -45.55, Latitude: -22.75

A series of widely spaced, scattered dykes, up to a metre thick, are aligned northeast-southwest and cut variable Precambrian gneisses. Rock types represented include nepheline-phyric tinguaite, porphyritic shonkinite and monchiquite.

Age: 
80 Ma (Ulbrich and Gomes, 1981).
References: 
MELCHER, G.C. and MELCHER, B.A. 1972. Novas ocorrencias de rochas alcalinas no Estado de Sao Paulo. Anais Congresso Brasileiro de Geologia, 26(1): 216-7. ULBRICH, H.H.G.J. and GOMES, C.B. 1981. Alkaline rocks from continental Brazil. Earth Science Reviews, 17: 135-54
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith