应用P-T-t理论再认识辽河群变质作用

A NEW UNDERSTANDING OF THE METAMORPHISM OF LIAOHE GROUP WITH THE THEORY OF P-T-t TRACE

辽河群是出露于辽宁省东部的独具特色的古元古代变质岩系,赋存丰富的矿产资源,研究历史悠久.但对有关辽河群变质作用的一些重要问题上看法诸多,很难取得一致意见.本文应用P-T-t轨迹理论重新认识这些问题,认为引起辽河群变质作用的根本原因是大陆碰撞造山带使辽河群俯冲到地下深处;辽河群变质作用在时间上和空间上有独特的演化特征;辽河群变质作用与不同规模的构造或不同层次的构造的关系是不一样的.

Liaohe group, outcropped in Eastern Liaoning Province, is a unique series of Paleoproterozoic metamorphic rocks, abundant in mineral resources. There has been a long history of research on the group, but arguments still remain about some key problems on the metamorphism of Liaohe group. This paper applies the theory of P-T-t trace in these problems. It is concluded that the basic reason for the metamorphism of Liaohe group was the subduction of the group caused by continental collision and orogeny. The evolving characteristics of the metamorphism are temporally and spatially unique. The metamorphism of Liaohe group varies with structures in different scales or levels.