| In the northern Cordillera lower Paleozoic alkalic and potassic mafic magmatism is linked with rifting of the Selwyn Basin. |
| Many experiments suggest that ancient subduction-related metasomatism affected OIB mantle sources long before island magmatism. |
| Both radiometric and biostratigraphic data indicate the onset of magmatism in late Mid-Jurassic time. |
| Prior to Cretaceous magmatism, the region underwent three major episodes of deformation. |
| The region east of the gravity lineament has witnessed intensive magmatism and basin development since Mesozoic time. |
| In the cooler middle and upper crust, felsic magmatism and aqueous metasomatism are most important. |
