Alkaline Rocks and Carbonatites of the World

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Jabal Nuqay (Jabal Eghei)


Occurrence number: 
Longitude: 19.05, Latitude: 23.43

Volcanic rocks cover an area of about 8000 km2 in the Jabal Nuqay area but very little is known about them. They appear to be principally basaltic flows but 'nepheline basalt' is also reported (Goudarzi, 1970). Hunting Geology and Geophysics Ltd (1974) report that plugs consist of rocks containing olivine phenocrysts in a groundmass of titanaugite and nepheline, with labradorite present in some samples but always subordinate to nepheline. A few samples were rich in analcime and a fibrous zeolite.

CONANT, L.C. and GOUDARZI, G.H. 1970. Geologic map of Libya.1:2 000 000. In Goudarzi, G.H. Geology and mineral resources of Libya - a reconnaissance. United States Geological Survey, Professional Paper, 660: 1-104.GOUDARZI, G.H. 1970. Geology and mineral resources of Libya - a reconnaissance.United States Geological Survey, Professional Paper, 660: 1-104.Hunting Geology and Geophysics Ltd, 1974.
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