By Mark Keiter, Chris Ballhaus, Frank Tomaschek

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Extra resources for A new geological map of the Island of Syros (Aegean Sea, Greece): Implications for lithostratigraphy and structural history of the Cycladic Blueschist Unit

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2007, Protolith ages of meta-igneous and metatuffaceous rocks from the Cycladic Blueschist Unit, Greece: Results of a reconnaissance U-Pb zircon study: Journal of Geology, v. 115, p. 83–98. , 1993, 40Ar/39Ar and oxygen isotope studies of polymetamorphism from Tinos Island, Cycladic blueschist belt, Greece: Journal of Metamorphic Geology, v. 11, p. x. , 2004, High-Si phengite records the time of greenschist facies overprinting: Implications for models suggesting mega-detachments in the Aegean Sea: Journal of Metamorphic Geology, v.

Often, they show a class 1C or class 2 profile (cf. Park, 1989) and have a generally (but not always) steep fold axial plane and interlimb angles between 100° and 50° (see Plate 1E). Their fold axes generally dip gently toward the ENE (60°–70°). They refold the penetrative s2 cleavage, and where pseudomorphs after lawsonite are present, these are deformed on the limbs of the folds (Fig. 15). An axial plane-parallel cleavage is, if at all, only very weakly developed. No trace of dynamic greenschistfacies recrystallization can be observed, which points toward a high-pressure origin of these folds.

2004a). There is no need to postulate a significant reorientation of blueschist-facies structures by retrograde deformation. , 2010). The conditions of lawsonite breakdown have been refined by Schumacher et al. (2008), who pointed out that the newly constrained stability of lawsonite on Syros toward higher temperatures potentially reconciles the relative deformation successions of Rosenbaum et al. (2002) and Keiter et al. (2004a) and leaves the possibility that lawsonite breakdown can be, to a certain degree, an early retrograde process.

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