stripes
Occurrence number:
155-00-057
Country:
Sudan
Location:
Longitude: 34.45, Latitude: 15.17
Carbonatite:
No
Standing 50 m above the surrounding clay-covered plain Jebel Mundara comprises a central mass of pyroclastic rocks with outlying ridges of syenite to the northwest and southeast. The pyroclastics include lavas, agglomerates and tuffs. The lavas are feldsparphyric and appear to be essentially trachytes. The syenites are riebeckite-bearing with quartz rare or absent.
Age:
A Rb-Sr nine point isochron gave 139±3 Ma (Klemenic, 1983; quoted in Vail, 1985, Table 1).
References:
DELANEY, F.M. 1958. Observations on the Sabaloka series of the Sudan. Transactions of the Geological Society of South Africa, 61: 111-24.VAIL, J.R. 1985. Alkaline ring complexes in Sudan. Journal of African Earth Sciences, 3: 51-9.
Location: