Alkaline Rocks and Carbonatites of the World

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Occurrence number: 
Kuboos-Bremen and Bremen Garub lines of intrusions
Longitude: 17.47, Latitude: -28.1

This 3x2 km intrusion lies to the northeast of, and in line with, the Grootpenseiland and Marinkas Kwela complexes (No. 116-00-042). Kanabeam consists of a series of ring dykes and circular plugs of nepheline syenite, quartz syenite, granite, phonolitic breccia and late dykes (Reid, 1991). Six distinct rings make up the nepheline syenite group distinguished by Reid, although two of these may contain either a little nepheline or quartz. Biotite and amphibole are ubiquitous the latter varying from hornblende to sodic amphibole in the more nepheline-rich rocks, in which a deep green sodic pyroxene is also found together with a little sodalite. Quartz syenite and granite form plugs in the southern and northern central parts of the complex. A number of breccia pipes within the complex are choked with xenoliths of gabbro, syenite, trachyte and phonolite porphyries. The matrix is a granular mosaic of feldspar and feldspathoid which chemistry indicates to be phonolitic. Modal, bulk rock and a few microprobe mineral analyses are given by Reid (1991).

REID, D.L. 1991. Alkaline rocks in the Kuboos-Bremen igneous province, southern Namibia: the Kanabeam multiple ring complex. Communications of the Geological Survey of Namibia, 7: 3-13.
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