Alkaline Rocks and Carbonatites of the World

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



Occurrence number: 
Longitude: 37.13, Latitude: 9.13

Le Bas and Mohr (1968, Fig. 1) indicate the presence of feldspathoidal rocks at four localities in the vicinity of Lekempti. They are apparently plug-like features. Comucci (1948 and 1950) refers to "tinguaite (phonolite) plugs from W Lekempti" and Raisin (1903) describes tinguaite from ‘E Lekempti’. Raisin (1903) also describes several rocks from near Bilo on the Gibbe River which include phonolite and coarser nepheline-bearing rocks. The nepheline is accompanied by alkali feldspar, aegirine to aegirine-augite, and in one specimen katophorite and riebeckite occur together with aenigmatite, while a phonolite contains sodalite. The field relationships of these rocks are not described.

COMUCCI, P 1948. La rocce della regione di Jubdo (Africa orientale). Accademia Nazionale Lincei, Rome. 262 pp.COMUCCI, P. 1950. Le vulcaniti del Lago Tana (Africa Orientale). Accademia Nazionale Lincei, Rome. 209 pp.LE BAS, M.J. and MOHR, P.A. 1968. Feldspathoidal rocks from the Cainozoic volcanic province of Ethiopia. Geologischer Rundschau, 58: 273-80.MERLA, G., ABBATE, E., AZZAROLI, A., BRUNI, P., CANUTI, P., FAZZUOLI, M., SAGRI, M. and TACCONI, P. 1979. A geological map of Ethiopia and Somalia (1973) 1:2,000,000 and comment with a map of major landforms. Consiglio Nazionale delle Ricerche Italy. Centro Stampa, Firenze. 1-95.RAISIN, C.A. 1903. Petrological notes on rocks from southern Abyssinia, collected by Dr. Reginald Koettlitz. Quarterly Journal of the Geological Society of London, 59: 292-306.
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