Alkaline Rocks and Carbonatites of the World

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

Upper Mareb Valley

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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.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith