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...

We report partial melting of an ultrahigh pressure eclogite in the Mesozoic Sulu orogen, China. Eclogitic migmatite shows successive stages of initial intragranular and grain boundary melt droplets, which grow into a three-dimensional interconnected intergranular network, then segregate and accumulate in pressure shadow areas and then merge to form melt channels and dikes that transport magma t...

The geochronology of metasediments incorporated to orogenic wedges provides an important key in understanding the early evolution collisional systems. This study reveals timing Variscan processes Saxothuringian wedge, reflecting transition from oceanic continental subduction and collision. In situ monazite U-Pb Rare Earth Elements (REE) geochemistry were performed Erzgebirge Crystalline Complex...

[1] Orogens with multiple (ultra)high-pressure ((U)HP) and (ultra)high-temperature ((U) HT) metamorphic events provide a complex but telling record of oceanic and continental interaction. The Early Paleozoic history of the “Heart of China,” the Qinling orogenic collage, offers snapshots of at least three (U)HP and two (U)HT metamorphic events. The preservation of remnants of both oceanic and co...

Thermodynamic calculations for selected silicate-oxide-fluorite assemblages indicate that several commonly occurring fluorite-bearing assemblages are restricted to relatively narrow fo,-fF> fields at constant P-T. The presence of fayalite-ferrohedenbergite-fluorite-quartz *magnetite and ferrosalite-fluorite-quartz-magnetite assemblages in orthogneisses from Au Sable Forks, Wanakena and Lake Ple...