The Igwisi Hills Kimberlite volcanic features in Tanzania are described in the article Mapping the Igwisi Hills kimberlite volcanoes, Tanzania: understanding how deep-sourced mantle magmas behave at the Earth`s surface (Brown and Sparks), as being Quaternary or younger in age and consistent with my earlier question and answer, What is it about ancient craton geology that results in associated kimberlite pipes containing economic diamond deposits?, it had erupted through the Tanzania Craton.
The article Tectonic setting of kimberlites (Jelsma et al. 2009) has made correlations between older kimberlite volcanics and aspects of the supercontinent cycle, specifically:
Kimberlites can be viewed as time capsules in a global plate tectonic framework. Their distribution illustrates clustering in time and space. Kimberlite ages span the assembly and break-up of a number of supercontinents, such as Rodinia and Gondwana. These supercontinents show time lines with (i) broad periods devoid of kimberlite magmatism corresponding to times of continent stability, and (ii) narrow kimberlite emplacement windows corresponding to times of fundamental plate reorganizations.
Implying a link between parts of the supercontinent cycle and kimberlite magmatism.
However, this implied tectonic setting does not seem to match with Quaternary Tanzania, when the Igwisi Hills kimberlite volcanoes erupted. Therefore, what are the tectonic implications of the Quaternary Igwisi Hills, Tanzania, kimberlite volcanics?
The only thing that comes to mind is the East African Rift tectonics, but are not sure about this link.