The Cretaceous Alkaline Dyke Swarm in the Central Segment of the Asunción Rift, Eastern Paraguay: Its Regional Distribution, Mechanism of Emplacement, and Tectonic Significance
Figure 8
Field relations illustrating the mechanism of emplacement of the dykes: (a) felsic dyke, with a vertical plane orientated according to N25W, evidencing a normal dilatation, (b) intermediate dyke, orientated according to N35W, showing a normal-oblique separation with slickenside surface on the walls of the dyke, and (c) mafic dyke, orientated according to N50W, showing a typical right-lateral opening with oblique movement between the walls.
