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- W2337796562 abstract "Despite the absence of ultrahigh-pressure (UHP) minerals such as coesite and microdiamond, Zhang et al. (2002a, 2002b) claimed to have found unambiguous evidence for UHP metamorphism in eclogites from the western Tianshan high-pressure (HP-LT) belt. UHP metamorphic rocks with an oceanic protolith provide evidence for the subduction of the oceanic lithosphere to mantle depths. If correct, these conclusions would demand a revision of previous tectonic models of northwestern China (e.g., Gao et al. 1995, 1998).However evidence for UHP eclogites is contradicted by the recent findings of Gao et al. (1999), Gao and Klemd (2000, 2001, 2003), and Klemd et al. (2002)—none of which was discussed by Zhang et al. (2002a, 2002b)—who estimated peak metamorphic conditions within the high-pressure eclogite-facies field. The equilibrium mineral assemblage of the eclogites and intimately interlayered garnet-omphacite blueschists from 25 different locations (Fig. 1⇓; including the three of Zhang et al. 2002a, 2002b) includes garnet-omphacite-rutile-quartz ± zoisite ± sodic-calcic to alkali amphiboles ± phengite ± paragonite. The eclogites only contain additional carbonates at two localities (Fig. 1⇓; also see Fig. 1⇓ in Zhang et al. 2002a). Using conventional exchange and net-transfer reactions (Gao et al. 1999; Gao and Klemd 2000, 2001, 2003; Klemd et al. 2002), as well as calculated PT-pseudosections for a specific bulk composition in the system NCFMASH (Klemd et al. 2002), peak conditions of 480 to 600 °C at 18–21 kbar were derived. Furthermore, Gao and Klemd (2001) suggested an isothermal decompression path as well as the presence of a low-salinity brine during HP-LT metamorphism.Although Zhang et al. (2002a, 2002b) only described three localities, they favored UHP conditions for all western Tianshan eclogites (see Abstract and Geological Implications in Zhang et …" @default.
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- W2337796562 date "2003-07-01" @default.
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- W2337796562 title "Ultrahigh-pressure metamorphism in eclogites from the western Tianshan high-pressure belt (Xinjiang, western China)-Comment" @default.
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