In a larger-scale context, the Baltic dolerites and the alkaline rocks of northeastern Poland were preceded by magmatic activity in the Pripyat palaeorift in southern Belarus which represents the northwestern continuation of the Dnieper-Donetsk Aulacogen in Ukraine.
The Baltic and NE Poland's alkaline magmatic provinces may be related to the Pripyat Igneous Province, which itself represents the northwestern continuation of the Dnieper-Donetsk Aulacogen.
However, if they represent an aulacogen (Failed-arm) type swarm (Fig.
The Seal Lake suite has previously been considered analogous to a flood basalt sequence ("plateau basalt" is the term used in Baragar, 1977), and the aulacogen type geometry of the Sudbury dykes suggests derivation from a spreading center located to the southeast of the swarm (Fahrig, 1987).
Percival, 1994), and thinner crust (35 km) beneath the Nipigon plate, a Mesoproterozoic aulacogen
developed on Superior Province basement.
The New Madrid fault zone is thought to be an aulacogen
- the failed arm of a plate tectonic rift system.
Thus, the negative DLFI zone outlined at the upper Amazon river aulacogen
may also infer a prospective sedimentary basin for oil and gas exploration.
This belt is controlled by faults and aulacogens
(sediment-filled tectonic troughs in cratons) in the continental plate.