McGarvie, Dave W.; Burgess, Raymond; Tindle, Andrew G.; Tuffen ,
Hugh and Stevenson, John A. Due to copyright restrictions, this
file is not available for public download |Google Scholar:||Look
up in Google Scholar| The Torfajökull central volcano lies in
Iceland’s southern flank zone (a non-rifting zone) and last
erupted in the 15th century. Peralkaline rhyolites from its pre-
Holocene formations have been dated by the Ar-Ar method. Ages
from 67±9 ka to 384±20 ka indicate Pleistocene eruptions, with
the oldest age (384 ka) also being from the most evolved
rhyolite (a pantellerite). The oldest age indicates that a
mature and evolved magmatic-volcanic system was well established
by the mid-Pleistocene and that the central volcano has been
active for at least 400 ka. Good correlation is found between
the Ar-Ar ages of sustained rhyolite eruptions into ice sheets
(i.e. rhyolite tuya formation) and oxygen isotope stages
dominated by cold conditions. This is the first stage of
developing a new proxy that uses rhyol