We read with interest the contribution by Polat et al. (2005) on the origin of Neoarchean volcanic and ophiolitic rocks in the Wutaishan greenstone belt, northern China, and their geo-dynamic setting. We do not dispute the quality of the authors' data and their interpretations, but we disagree with their tectonic model, which ignores field evidence and a large amount of precise zircon ages recently obtained for the Hengshan–Wutaishan–Taihangshan mountain belt.

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In the model shown in their Figure 9, Polat et al. (2005) proposed a Late Archaean continent–arc–continent collision system, in which the high-grade Hengshan and Fuping complexes represent two exotic...

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