昆仑—秦岭造山系的几个问题

昆仑—秦岭带加里东旋回的洋盆不是从元古代继承下来的,而是由寒武纪裂谷发展而来的,它在志留纪即宣告封闭;昆仑石炭纪—二叠纪海底裂谷带或可能的小洋盆,在晚二叠世前已经消失,三叠纪时昆仑—秦岭带只有海,而没有洋。因此,印支造山运动并不是洋盆消失后的陆—陆碰撞造山,而是陆—陆叠复造山(大陆壳消减造山)作用。

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).