Alkaline Rocks and Carbonatites of the World

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

Upper Mareb Valley

stripes

Occurrence number: 
052-00-001
Country: 
Eritrea
Location: 
Longitude: 39.02, Latitude: 14.65
Carbonatite: 
No

A petrographic description of a tinguaite dyke is given by Manasse (1909), but few other details are available. It is a very fine-grained rock with a fluidal texture and comprises alkali feldspar, green pyroxene, probable lavenite, nepheline, magnetite, apatite and possible sodalite. A rock analysis is given. This may be the same as the tinguaite reported by Mohr (1962) as occurring near Azeo in the Mareb basin.

References: 
MANASSE, E. 1909. Contribuzioni allo studio petrografico della Colonia Eritrea. Siena.169 pp.MOHR, P.A. 1962 (reprinted 1971). The geology of Ethiopia. University College of Addis Ababa Press. Addis Ababa. 268 pp.
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