Kapp et al. (2000) proposed that the metamorphic rocks in the middle Qiangtang are similar to the Franciscan melange, which was underplated to the Qiangtang block and was subsequently exhumed by detachment faulting, and that these processes occurred during Late Triassic–Early Jurassic southward subduction of oceanic lithosphere. However, these recognitions are not consistent with many facts. Three main questions are listed as follows.

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1. The entirety of the metamorphic belt is not similar to melange. The metamorphic rocks include interbeds of marble, carbonaceous slate, and thin coal layers, and ripple marks are preserved in some marble beds. The strata in...

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