stripes
Occurrence number:
180-00-004
Country:
Zambia
Location:
Longitude: 29.17, Latitude: -9.42
Carbonatite:
No
The Lusenga syenite is an approximately circular, 8 km diameter intrusion with two smaller syenite bodies to the northeast (Brewer et al., 1979). The rocks are described as consisting of orthoclase, subordinate albite, interstitial quartz (although three of four chemical analyses indicate 2.2-2.7 normative nepheline) and chlorite, probably after biotite. One analysed specimen gives 6.6% normative acmite.
Age:
A Rb-Sr isochron, based on five samples, gave an age of 1134±8 Ma.
References:
BREWER, M.S., HASLAM, H.W., DARBYSHIRE, D.P.F. and DAVIS, A.E. 1979. Rb-Sr age determinations in the Bangweulu Block, Luapula Province, Zambia. Report, Institute of Geological Sciences, 79/5: 1-11.
Location: