论扬子古陆东南边缘造山带形成时代

GEOLOGIC AGE OF THE OROGENIC BELT ALONG THE SOUTHEASTERN MAKGIN OF THE YANGTZE ANCIENT LAND

对扬子古陆东南缘浅变质岩层、花岗岩类、构造变形特征研究表明：“板溪杂岩”不是早古生代到三叠纪形成的；而是元古代前震旦纪形成的。由“板溪杂岩”组成的造山带不是中生代板块碰撞的产物，而是元古代华南地体向杨子地体俯冲一碰撞形成的造山带。在后来的地质时期受邻区造山事件的影响，对本区构造起了改造作用。

Studies on the epimetamorphic rocks and granItoids in the southeastern margin of the Yangtze ancient landand their tectonic delormation features show that the“Banxi Complex”was formed in Proterozoic or pre一Sinlan , not inthe time from early Paleozoic to Trlassic, and the orogenic beIt composed of the“Banx1 Complex,was derived from thesubdluction and collision of the Proterozoic Huanan block to the Yangtze block , not from the collision of Mesozoic plates。The studied area was reworked later under the influence orogenic events in adjacent areas。