Abstract
The Troodos (Cyprus) and Kizildag (southern Turkey) ophiolites in the eastern Mediterranean region represent remnants of the Neotethyan ocean, which evolved as a result of seafloor spreading north of Afro-Arabia in Mesozoic time. Both ophiolites display numerous planar to listric normal faults and structural grabens in their sheeted dike complexes suggestive of tectonic extension, and complex intrusive relations in their plutonic units indicate recurring and intermittent magmatic activities. Detachment surfaces within the lower crustal sequence (Troodos) or at the boundary between the crustal and mantle sequences (Kizildag) define a brittle-plastic transition zone along which tectonic thinning and extension within the crustal units above was accommodated by mylonitization and denudation in lower crustal units or mantle rocks below. The variation in depth to these accommodation zones is inferred to be a function of the vertical temperature gradient in the oceanic lithosphere, which may in turn point to the...
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