中国东北地区古生代构造单元：地块还是造山带？

Paleozoic Tectonic Units of Northeast China:Continental Blocks or Orogenic Belts?

华北克拉通以北的中国东北地区古生代构造单元是地块还是造山带,是地质界近年争论的重要地质构造问题.通过对已有资料的综合研究,简要总结和讨论了各个“地块区”的地质特征,认为这些所谓的地块中,额尔古纳是新元古代晚期至古生代初期存在的地块,从寒武纪开始转变为造山带;其余所谓的古地块都是由古生代蛇绿岩、具有活动陆缘亲缘性的岩浆岩、增生杂岩和少量前南华纪岩石组成的古生代陆缘增生造山带或岛弧造山带.在此基础上,对该区地质历史上古老变质岩与地块关系、佳蒙地块是否存在、构造单元构造属性随时间变化等问题进行了初步讨论.

Whether the Paleozoic tectonic units of the Northeast China region north to North China craton are continental blocks or orogenic belts is a hot-debated tectonic issue in the China geological field.In this paper,based on the comprehensive study of available geological data,it briefly summarizes and discusses geological features of those so-called continental blocks,and points out that the Ergun of them was a ancient block from the Late Neoproterozoic to the beginning of Paleozoic and changed into Paleozoic orogenic belt in the Cambrian,and that all the others are Paleozoic accretionary or island arc orogenic belts which are composed of Paleozoic ophilolites,magmatic complexes in the active continental margins,accretionary complexes,and minor Pre-Nanhua rocks.And then,several problems,such as the relationship between the ancient metamorphic rocks and continental blocks,Jia-Meng block,and evolution and change of tectonic units in their tectonic features with time,are discussed.