One is in a continetal rift setting, an area where a continent is being pulled apart as shown in figure 2, and the other is in an Andean type continetal margin, where an oceanic plate is subducting underneath a continental plate as shown in figure 3.
One is in a continetal rift setting, an area where a continent is being pulled apart as shown in figure 2. Another hypothesis suggest an Andean type continetal margin, where an oceanic plate is subducting underneath a continental plate as shown in figure 3.