| The most widely accepted view is that of an accretionary prism developed above an active subduction zone. |
| Around both zones accretionary wedges are indications of Cretaceous subduction. |
| An alternative mechanism to open the rift basins is subduction rollback of the Indian plate to the west of Thailand. |
| What remains unclear is whether the rocks formed in an open ocean or a marginal back-arc basin associated with a subduction zone. |
| The magmas that formed the batholith were generated in response to the subduction of the Farallon plate beneath the North American plate. |
| Therefore, both a mantle plume and also the subductions of the oceanic plates may have mutually contributed to create the magmatic zone. |
