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.
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.
Occurrences
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith