Whether south China was a platform or a para-platform after the mid-Paleozoic deformation or whether the mountains of Huanan (= south China) form a Mesozoic collision-type orogen depends upon whether the ophiolite melange in the Yangtze region is Precambrian basement or was overthrust onto a foreland thrust belt during the Mesozoic. This paper presents evidence of tectonic windows under the melange and basement klippes above the melange in the Yangtze region.

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