stripes
Occurrence number:
155-00-002
Country:
Sudan
Location:
Longitude: 30.87, Latitude: 21.23
Carbonatite:
No
Jebel Ataliya comprises four concentric ring intrusions around a central plug, the whole slightly elliptically-shaped complex being 12 km long. It comprises syenites, from which quartz may be absent or up to 30%, perthite, hornblende with rims of aegirine-augite or hornblende altering to riebeckite; barkevikitic amphibole and orange-brown biotite are rare (Hohndorf et al., 1994; J.R. Vail pers. comm., 2000).
Age:
A nine point Rb-Sr isochron gave an age of 297.0±6.1 Ma (Hohndorf et al., 1994).
References:
HOHNDORF, A., MEINHOLD, K-D. and VAIL, J.R. 1994. Geochronology of anorogenic igneous complexes in the Sudan: isotopic investigations in North Kordofan, the Nubian Desert and the Red Sea Hills. Journal of African Earth Sciences, 19: 3-15.J.R. Vail pers. comm., 2000.
Location: