Tuanliangzi-Daxinshan metamorphic belt is made of phyllite and shallow metamorphic-clastic rocks, with a low greenschist facies, a regional low-temperature dynamic metamorphism type, which belongs to one part of Lancang Group in keeping with Lancang metamorphic depression belt proposed by Zhaojing etal. The belt to form was connected with Paleo-Tethys subducting from west to east along Changning-Shuangjiang metamorphic belt.

研究区团梁子—大新山变质岩带是一套千枚岩,浅变质碎屑岩,变质程度均仅达低绿片岩相,属区域低温动力变质作用类型,与赵靖等提出的澜沧变质带低压带一致,应属澜沧群的一部分,其形成与古特提斯洋沿昌宁-孟连双变质带由西向东的俯冲活动有关。