Alkaline Rocks and Carbonatites of the World

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

Jebel Ed Dair (Ed Daier)

stripes

Occurrence number: 
155-00-068
Country: 
Sudan
Location: 
Longitude: 30.7, Latitude: 12.5
Carbonatite: 
No

A 25 km diameter granite intrusion lies on the margin of the Nuba Mountains. It apparently comprises a single unit of peralkaline granite of perthite, sodic amphibole replaced by aegirine and accessory zircon. Rock analyses are available in Curtis and Lenz (1985)

Age: 
Four samples of the peralkaline granite gave a Rb-Sr isochron age of 542±12 Ma (Curtis and Lenz, 1985). Batyrmurzaev et al. (1982) obtained a K-Ar apparent age of 360±12 Ma.
References: 

BATYRMURZAEV, A.S., TROFIMOV, N.N., SHAKHPAZOV, I.M., AHMED, F., KHALIL, B.E., ZAKIEVA, F.S., GADZLIIEO, S.Z. and SLYMAEV, A.A. 1982. The absolute age of minerals in certain Sudanese provinces. In: Mobile belts and deposits. A collection of scientific papers, Academy of Sciences, Moscow. Patrice Lumumba University: 30-6. CURTIS, P. and LENZ, H. 1985. Geological and geochronological investigations of selected alkali igneous complexes in the Nuba Mountains, southern Kordofan, Sudan. Geologisches Jahrbuch, 69: 3-24.

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