RE: Hole In Earth's Crust
No. It's that part of the ridge closest to the Cape Verde Islands.
Patsy.
RE: Hole In Earth's Crust
Atlantis would pose a phenomenon in sinking new to geology as it wasrecent - from just before real history re-starts (that's why the rest is "pre-history"). So it supposes catastrophism as a theory on a major scale.
RE: Hole In Earth's Crust
Patsy- Can I suggest you check your definition?
Island arcs are formed above subduction zones, at destructive plate margins.
None of the island groups you mention is an island arc.
Iceland sits astride the spreading ridge and is predominantly a flood basalt province.
The Cape Verde Islands (though all volcanic in origin) have only one active volcano- Fogo.
The Canaries actually mostly sit on continental crust rather than oceanic and are more like the Hawaian group in origin than anything at either a spreading ridge or an island arc.
As for Atlantis- if anyone needs a volcanic source for that, I think Santorini looks like the best candidate for a (literally) smoking gun. It's the right sort of age and in a place where Mediterranean late Bronze Age civilisation could hardly miss it.
RE: Hole In Earth's Crust
It's off-topic but anyway --- I don't "go" for Santorini, Sam. "Beyond the pillars of Hercules" seems indicative, and the very name Atlantis is too. The event seems to have corresponded in time with major climatic changes globally such as the shift of the north polar ice-cap to Siberia (end of the mammoths there), the appearance of the Gulf Stream (because now there was nothing to get in its way?) etc, circa 10,500 B.C.
V
RE: Hole In Earth's Crust
You would possibly favour the Azores area then. There are several sunken islands there, though most predate your dates by many millennia and none is very big.
The area Patsy's link refers to is the 15/20 N fracture zone. A long way from the Azores and further from the "Pillars of Hercules" (if you take that to mean Gibraltar) even than Thera!
Incidentally, there are several sites showing older versions of similar structures in the UK- bits of Cornwall and Ayrshire for example. Far older of course, dating from the previous "Atlantic" Ocean.