A circular dome 11 km wide with annular and radial fractures is thought to lie above an alkaline intrusion. Dykes, which may have been alkaline, are heavily weathered.
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Within the Lages dome, which is some 30 km in diameter, numerous alkaline intrusions are emplaced, mainly within Permo-Carboniferous sandstones. The majority of the intrusions are sheet-like in form but dykes up to several 100s of metres in thickness also occur.
Anitapolis is a partially zoned intrusion of 5 km2, the emplacement of which produced a system of radial and concentric fractures in the surrounding Precambrian granites.