We discuss the assembly and tectonochronology of Cycladic Blueschist Unit (CBU) in central Aegean Sea region, Greece, as a composite, subduction-related, high-pressure (blueschist to eclogite facies) stack nappes. Our work is based on review geochronologic data from islands Tinos, Syros Sifnos. In addition, we present large set 34 new, internally consistent Rb-Sr multimineral isochron age these...

Abstract. Retrograde metamorphic rocks provide key insights into the pressure–temperature (P–T) evolution of exhumed material, and resultant P–T constraints have direct implications for mechanical thermal conditions subduction interfaces. However, constraining retrograde has historically been challenging resulted in debate about experienced by these rocks. In this work, we combine elastic therm...

The architecture and pressure-temperature conditions reached by a Cretaceous block-in-matrix serpentinite mélange exposed in the Zagros suture resemble those imaged active Mariana subduction zone. There, large magnitude-earthquakes (M>w9) have never been recorded but smaller events – of poorly-constrained physical origin range M?w3-6 are widespread. Field petro-structural constraints led to fir...

Abstract The Rocca Canavese Thrust Sheets Unit (RCTU) is a subduction-related mélange that represents the eastern-most complex of Sesia–Lanzo Zone (SLZ), bounded by Periadriatic (Canavese) Lineament separates Alpine subduction from Southalpine domain. RCTU limited to south Lanzo Massif (LM) and east Eclogitic Micaschists Complex (EMC). Particularly tectonic contact area RCTU, adjacent neighbour...

The Queyras-Monviso traverse of the Schistes Lustrés complex, is a stack underplated nappes oceanic rocks subducted from blueschist- to eclogite-facies conditions. This study reports on salinities and gas contents primary fluid inclusions trapped in high pressure veins metasediments metamafic (445 22 samples). These data provide snapshots compositions fluids present at peak burial conditions, v...

The island of Syros consists largely of possibly-repeated sequences of glaucophane-bearing calcareous schists, mafic schists, dolomite marbles, and calcite marbles containing abundant aragonite pseudomorphs (Dixon, 1969; Hecht, 1984). Several discrete, fault-bounded packages of blueschist/eclogite-facies mafic rocks with minor serpentinite are also found on the island. Although the mafic rocks ...

The Dora-Maira massif is an archetypal nappe stack of subducted and exhumed upper crust. Slices continental crust experienced metamorphism at blueschist to ultrahigh-pressure (UHP) eclogite-facies conditions. While the timing peak in UHP unit has been extensively studied, little known about other units. In order constrain conditions high-pressure metamorphism, U-Pb-trace element analyses rutile...