- 2. geologic history -
Mainly summarized from Heiken and McCoy (1984),
Bond and Sparks (1976), Druitt and others (1989) and Friedrich (1994).
Part of the masters' and phd theses by Tom Pfeiffer (1999, 2003), geology department Aarhus, DK, under
Prof. W. Friedrich.
Simplified geologic map of Santorini. After Friedrich (1994).
Non-volcanic rocks are exposed on Santorini at
the Profitis Ilias Mountain, Mesa Vouno, the Gavrillos ridge,
Pirgos, Monolithos and the inner side of the caldera wall between
Cape Plaka and Athinios.
They represent a former non-volcanic island of about 9x6 km
extension similar to neighboring Cycladic islands like Anaphe,
Ios or Amorgos. The rocks consist of metamorphosed limestone and
schist from Triassic to Tertiary time folded during the Alpine
folding. The observed metamorphose grade is a blue-schist facies
resulting from tectonic deformation by the plate collision in the
Oligocene to Miocene. At Athinios a 9.5 million year old Miocene
granite intrusion has been found; it is part of the Cycladic
Granitic Province and is the source of ore minerals including
talcum, chalcopyrite, chrysocolla, magnetite and others.
3.1. Eruptive history
3.2. Documented historic activity: The Kameni islands
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