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A combined study of mineral inclusions, U–Pb ages and trace elements was carried out on zircon from migmatites in the Dabie orogen. The results provide insights into multistage anatexis of ultrahigh-pressure metamorphic rocks in the continental collision orogen. Zircon grains in thin sections and mounts record four episodes of magmatic, metamorphic and anatectic events: (1) middle Neoprotrozoic U–Pb...
The Ti-in-muscovite geothermometer was empirically calibrated as ln[T( o C)]=7.258+0.289ln(Ti)+0.158[Mg/(Fe+Mg)]+0.031ln[P(kbar)] using ilmenite- and Al 2 SiO 5 -bearing assemblages in metapelites under P–T conditions of 450–800°C and 0.1–1.4GPa. The calibration was conducted for muscovites containing Ti=0.01–0.07, Fe=0.03–0.16, Mg=0.01–0.32 and Mg/(Fe+Mg)=0.05–0.73, respectively,...
Zircon can grow from aqueous fluid and hydrous melt in crustal rocks when they undergo metamorphic dehydration and partial melting under high-pressure (HP) to ultrahigh-pressure (UHP) conditions. A distinction between fluid and melt has important bearing on the development of crustal anatexis in collisional orogens. A genetic transition between fluid and melt is recorded by zircons from pegmatite...
A combined study of mineral compositions and zircon U–Pb ages was carried out for a zoisite―quartz vein and its host retrograded eclogite in the Dabie orogen. The results reveal two episodes of fluid action during exhumation of the deeply subducted continental crust. The vein has a mineral paragenesis of quartz+zoisite+epidote+white mica+garnet+rutile+zircon+apatite, which is almost the same as that...
In-situ SIMS analyses of O and U–Pb isotopes as well as LA-(MC)-ICPMS analyses of trace elements, U–Pb, and Lu–Hf isotopes were carried out for zircon from a quartz vein and its host UHP eclogite in the Dabie orogen. The results are integrated to decipher the effect of aqueous fluid on the new growth of metamorphic zircon and on the recrystallization of protolith zircon during continental subduction-zone...
Major and trace elements for garnet and other minerals, and U–Pb ages and trace elements for zircon (as inclusions in garnet or as matrix) were determined on thin sections of UHP eclogite from the western part of the Dabie orogen. The results provide temporal constraints on growth of garnet during continental subduction-zone metamorphism. Major elements show homogeneous distribution across garnet...
Simultaneous in-situ analyses of trace elements, U–Th–Pb and Lu–Hf isotopes were carried out on distinct domains of zircons in ultrahigh-pressure (UHP) eclogite-facies metamorphic rocks from the main hole of the Chinese Continental Scientific Drilling (CCSD) in the Sulu orogen. For the first time, trace elements are directly linked to Lu–Hf isotopes in metamorphic zircons with reference to their U–Pb...
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