Alkaline Rocks and Carbonatites of the World

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

Jebel Kakada

stripes

Occurrence number: 
155-00-069
Country: 
Sudan
Location: 
Longitude: 29.07, Latitude: 11.68
Carbonatite: 
No

This intrusive complex consists of three overlapping units with a small area of felsic pyroclastic rocks. The earliest intrusion is a subalkaline syenite which is cut by a peralkaline syenite of perthite, a little quartz, interstitial sodic amphibole and minor aegirine. This was followed by a peralkaline granite with sodic amphibole and accessory zircon and fluorite. Scattered outcrops of quartz-feldspar porphyry appear to define a ring-dyke of 10.5x7.5 km; this rock also contains sodic amphibole.

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: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith