stripes
Occurrence number:
155-00-073
Country:
Sudan
Location:
Longitude: 29.15, Latitude: 11.47
Carbonatite:
No
The 7 km diameter Jebel Lagowa intrusion cuts banded granitic gneisses, which are well exposed around the foot of the hill, and is cut by east-west-trending dykes of spherulitic rhyolite, quartz-feldspar porphyry and microsyenite. Most of the intrusion is occupied by a syenite with interstitial quartz, calcic-sodic clinopyroxene and amphibole, but an approximately 2 km diameter peralkaline syenite lies within the northern part of the intrusion.
References:
CURTIS, P. and BRINKMANN, K. 1985. The geology of younger intrusive alkali complexes in the southwestern Nuba Mountains, Sudan. Geologisches Jahrbuch, 63: 3-41.
Map:
Fig. 3_290 Alkaline intrusions of the northwesterly part of the southwest Nuba Mountains (after Curtis and Brinkmann, 1985, Geological Reconnaissance map, inset, 1:250,000).
Location: