stripes
Occurrence number:
155-00-031
Country:
Sudan
Region:
Bayuda Desert intrusions
Location:
Longitude: 32.28, Latitude: 18.68
Carbonatite:
No
This is a circular intrusion 3 km in diameter which has a 1 km diameter core of peralkaline syenite that is surrounded by three concentric shells of peralkaline syenite and peralkaline quartz syenite porphyry, the outermost being very coarsely crystalline. There are numerous radial trachyte and quartz porphyry dykes that cut both the intrusion and the country rock gneisses. There is a 50 m wide contact aureole heavily impregnated by syenite.
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 (unpublished)
Location: