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).

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However evidence for UHP eclogites is contradicted by the recent findings of Gao et al. (1999), Gao and Klemd (2000,...

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