The Galápagos hotspot is probably responsible for the main plume-related magmatic event 90 Ma, whilst the 76 Ma and 55 Ma event are related to lithospheric thinning in the Central Caribbean.
The Galápagos hotspot is likely to be the main driver behind the major volcanic activity that occurred 90 million years ago. Conversely, the 76 million-year-old and 55 million-year-old events are more closely tied to the process of lithospheric thinning in the Central Caribbean.