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• W2355140605 abstract "Laser Raman spectroscopy and cathodoluminescence ( CL) images show that zircons separated from eclogite lens in impure marble from Shuanghe area, Dabie UHP metamorphic belt, are characterized by inherited ( detrital) , prograde, UHP and retrograde metamorphic overgrowth domains. The inherited (detrital) zircons contain Pl + Ap and Qtz + PI in the white-luminescent core and the dark-luminescent rim, respectively. Whereas the prograde metamorphic domains ( with grey-luminescent CL images) preserve quartz eclogite-facies mineral assemblage of Qtz + Grt + Omp + Phe + Dol + Ap, formed at 588 -668℃and 1.7 - 1. 8GPa. In contrast, the UHP metamorphic domains (with white-luminescent CL images) retain index UHP mineral assemblage of Coe + Grt + Omp + Arg + Mgs + Ap, and record UHP condition of T = 784 - 849℃and P 5. 5GPa. The outmost retrograde rims ( with dark-luminescent CL images) however, contain no-UHP minerals such as quartz and calcite, related to the regional amphibolite-facies retrogression with T = 550 - 720℃and P = 0. 8 - 1.4GPa. SHRIMP U-Pb dating on these zoned zircons identify four discrete and meaningful age groups; 2701 - 1753Ma (207Pb/206Pb age) is recorded in the inherited (detrital) zircons derived from Archean-Proterozoic protolith, the prograde metamorphism of quartz eclogite-facies in the prograde domains occurred at 249 - 241 Ma ( Pb/ 238U age) , the UHP metamorphic event in the UHP mineral-bearing domains was at 239 - 231 Ma (206Pb/238U age) , and the late amphibolite-facies retrograde overprint in the outmost rims was restricted at 219 -211 Ma (206Pb/238U age). Thus, Archean-Proterozoic continental materials of the Dabie UHP terrane were subducted to 55 - 60km depth at Early Triassic and occurred quartz eclogite facies metamorphism simultaneously. Then these quartz eclogite-facies metamorphic rocks continued subduction to 165 - 175km deep mantle depth at Middle Triassic and experienced UHP metamorphism; The peak pressures are based on the equilibrium calculation of the reaction dolomite = magnesite + aragonite. This UHP metamorphism recorded a lower geotherm step of 4. 7℃km-1 which is within what was previously considered a ' forbidden' condition within earth. Finally these UHP metamorphic rocks were exhumed to mid-crustal levels ( about 30km) in the Late Triassic and overprinted regional amphibolite facies metamorphism. The subduction and exhumation rate deduced from the SHRIMP data and metamorphic P-T conditions is 11 - 12km Myr-1 and 7.5 - 8. 1km Myr-1 , respectively. Fast subduction and rapid exhumation has been considered to be one of the most important factors for the preservation of prograde, UHP and retrograde metamorphic minerals in zircons. Such a fast exhumation suggests that the Dabie UHP metamorphic rocks returned towards the crustal depths as dominant part of a buoyant sliver, caused as a consequence of slab breakoff." @default.
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• W2355140605 title "SHRIMP U-Pb zircon dating from eclogite lens in marble, Shuanghe area, Dabie UHP terrane: restriction on the prograde, UHP and retrograde metamorphic ages." @default.
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