Some problems on the Kunlun-Qinling orogenic system

The Caledonian Kunlun-Qinling oceanic basin was not a successor of the Proterozoic oceanic basins, but came from a rift in the Cambrian, and was closed during the Silurian. The Carboniferous-Permian Kunlun seafloor rift or small oceanic basins had disappeared before the Late Permian. In the Triassic, there was no ocean, but just a sea in Kunlun-Qinling. Therefore, the Indosinian orogeny was not a continent-continent collision orogeny after oceanic basin disappeared, but a continent-continent superimposed orogeny(i.e. continental crust subduction one).