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The kimberlite pipes with craters filled with sedimentary rocks are rarely preserved. The best studied and currently mined pipes are Orapa (Gernon et al. 2009) and Mwadui (Stiefenhofer and Farrow 2004). Gentle dip angles of rock stratifications are most typical there, while some steeper angles are considered to be controlled by an on-slope angle of repose (Gernon et al. 2009) or related to sуn-eruption subsidence and faulting (Brown et al. 2008). Angola hosts many pipes of this type. For example, among 70 kimberlite bodies discovered within the concession of 350 km in an area with the Catoca pipe in its center, 50% contain craters with volcanosedimentery infill. Owing to many post-emplacement deformations, the Catoca and some other pipes of the area can be studied to clarify the causes of possible syn-sedimentation subsidence within the crater.

Catoca kimberlite pipe: Diatreme/crater transition and dynamics of the crater sedimentation