Alkaline Rocks and Carbonatites of the World

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Salale Mountains

stripes

Occurrence number: 
054-00-030
Country: 
Ethiopia
Location: 
Longitude: 38.32, Latitude: 9.5

The cone of Salale rises to about 800 m and has a shallow crater. Rocks collected on the northeastern flanks proved to be melanephelinite (Le Bas and Mohr, 1968). They contain phenocrysts of titanaugite and microphenocrysts of apatite and an opaque phase set in a groundmass of titanaugite and aegirine augite, opaques, chlorite and zeolite, which were thought to be after nepheline. Amygdales are filled with natrolite, analcime and calcite. Agglomerates near the melanephelinites are carbonated and cut by calcite veins 10-50 cm in thickness and up to 2 m in length, but on the basis of texture and chemistry these are not considered to be carbonatites.

Age: 
Possibly Pliocene, based on morphology (P.A. Mohr, pers. comm. 1995).
References: 
LE BAS, M.J. and MOHR, P.A. 1968. Feldspathoidal rocks from the Cainozoic volcanic province of Ethiopia. Geologischer Rundschau, 58: 273-80.
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