Bangweulu Block

The Bangweulu Block is a cratonic unit that forms part of the Congo craton of central Africa. The Bangweulu Block however consists of Palaeoproterozoic granitoids and volcanics, and is overlain by a Palaeoproterozoic continental sedimentary succession, the Mporokoso Group, and does not preserve much direct evidence of Archaean protoliths.

Indirect evidence of an Archaean ancestry for the Bangweulu Block is provided by detrital zircons within the Mporokoso Group, which indicate a local source area with zircons of 3.2, 3.0. 2.7 and 2.5 Ga, but more importantly, by xenocrystic zircon found in volcanic and granitic lithologies of the Bangweulu Block, and the area to the West, the Central African Copperbelt (Rainaud et al., 2003). This indicates the presence of a ca. 3.2 Ga terrane called the Likasi Terrane.

References

Rainaud, C., Master, S., Armstrong, R.A. and Robb, L.J. (2003) "A cryptic Mesoarchaean terrane in the basement to the Central African Copperbelt", J. Geol. Soc., London, 160 (1), p. 11-14, doi:10.1144/0016-764902-087

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