It Came from Beneath the Sea
“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Mar 5, 2014
Aha. Fernandina... Looks like the intersect of the Tunis arc & the E. arm of the Sicily rift.
Pantelleria (in the rift core) was active at about the same time.
For the record the bulk of the magma in the Tunis arc travels down long fractures & ends up in the least compressed bit @ Etna.
Etna is still busy.
Eruptions are relatively rare & widespread in the "Campi Flegrei del mar sicilia" (the volcanic field containing Fernandina) as a result of occasional rift fractures intersecting the magma filled fractures being squeezed E. toward Etna. An eruption in Roman times was from a different vent of the same volcanic field.
The last megathrust event opening magma filled fractures in the Tunis arc was ~14500BC or thereabouts but may have been even earlier, part of Caucasur-Elburz & Afghan-Pamir-Turfan & Mediterranean-Atlas series which relaxed the crust of the Eurasian plate. This one also relaxed the Alpine backrange & opened the crust over the Eiffel hotspot (NW Europe).
No sign so far of any other megathrust event in the Atlas range &-Tunis arc after that date so all the Holocene constructional activity is magma incorporated into the deep crust of the arc from that megathrust (probably all of the Atlas range as well as Tunis), seems to be a lot of volume.
Not sure how many vents in the Fernandina region are Holocene.
Pantelleria has been busy in the past & may be magma capture from the atlas & Tunis backarc rather than the Sicilian rift per se. Only the central eruptions showed up in the past, the submarine events (such as the historic eruption) have not showed up due to survey dating problems (not performed).
have a nice day: Ag
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