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The Galapagos hotspot has a very complicated tectonic setting. It is located very close to the spreading ridge between the Cocos and Nazca plates; the hotspot interacts with both plates and the spreading ridge over the last twenty million years as the relative location of the hotspot in relation to the plates has varied. Based on similar ...
More recently the hotspot has been located to the south of the GSC resulting in an overall relative northward movement of the GCS. However, the eastern section of the GSC shows evidence of repeated ridge jumps, with the active spreading location moving episodically to the south, towards the hotspot, creating the Galápagos transform.
Alcedo, like the other volcanoes in the Galapagos, has been formed as part of the Galapagos hotspot, which is a mantle plume resulting in a hotspot. The volcano is not directly on the hotspot, which is believed to be under the neighbouring island of Fernandina to the west. However, it is still active, with its last eruption in 1993.
Furthermore, the Galápagos Hotspot is at the northern boundary of the Pacific Large Low Shear Velocity Province while the Easter Hotspot is on the southern boundary. [ 9 ] [ 10 ] [ 11 ] The Galápagos Archipelago is characterized by numerous contemporaneous volcanoes, some with plume magma sources, others from the asthenosphere , possibly due ...
The primary hotspots originate from the core/mantle boundary and create large volcanic provinces with linear tracks (Easter Island, Iceland, Hawaii, Afar, Louisville, Reunion, and Tristan confirmed; Galapagos, Kerguelen and Marquersas likely).
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. [8] 40 Ar/ 39 Ar dating have determined that the main magmatism occurred (Ma) while a second pulse occurred 81-69 Ma. Around 86 Ma the arrival of a large ...