Alkaline Rocks and Carbonatites of the World

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

Jebel Nashki

stripes

Occurrence number: 
155-00-035
Country: 
Sudan
Region: 
Bayuda Desert intrusions
Location: 
Longitude: 32.12, Latitude: 18.03
Carbonatite: 
No

This is a heavily faulted fragment of a ring structure which is covered by Nubian Sandstone on its northeastern side. The intrusion consists of peralkaline or biotite granite in the northeast and syenite in the southwest. The southern area is composed of felsite porphyries and the western part of basement rocks, hybrid biotite granite and trachyte dykes.

Age: 
A date of 233±5 Ma was obtained by Rb-Sr on a single sample of granite (Barth et al., 1983).
References: 

BARTH, H. and MEINHOLD, K.-D. 1979. Mineral prospecting in the Bayuda Desert. Part 1, Volume A. Investigation of mineral potential. Technical Report Sudanese-German Exploration Project. Hannover (Bundesanstalt fur Geowissenschaften und Rohstoffe). 336 pp. (unpublished) BARTH, H., BESANG, C., LENZ, H. and MEINHOLD, K.-D. 1983. Results of petrological investigations and Rb/Sr age determinations on the non-orogenic igneous ring-complexes in the Bayuda Desert, Sudan. Geologisches Jahrbuch, 51: 1-34.

Map: 
Fig. 3_281 The Gilif Hills (No. 155-00-050) with the volcanic rocks of Wadi Abu Rugheiwa to the west of them. Also shown are Jebel Nashki (No. 155-00-035), Jebel Umm Handal (No. 155-00-036), Bayuda (No. 155-00-053) and Abu Dom (No. 155-00-041). (after 1:250,000 geological map, Barth and Meinhold, 1981).
Location: 
All locations > Africa > Sudan > Bayuda Desert Intrusions
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith