陈蔡群构造变形特征及变形时代讨论

构造解析表明浙西南陈蔡群曾遭受5期构造变形叠加改造。每期构造变形都在基底岩系中留下各种不同构造形迹。变质变形关系研究和不同变质构造单元对比研究结果表明，陈蔡群所遭受D1、D2变形与其主期变质作用同时，均为早元古宙末吕梁运动产物②，而D3、D4变形和D5变形分别为晋于运动和加里东运动叠加改造结果。

DISCUSSION ON CHARACTERISTCS OF STRUCTURAL DFFORMATIONS AND THE AGES OF DEFORMATIONS ABOUT CHENCAI GROUP

Structural analysis lndicates that Chencai group in the southwestern Zhejiang province was experienced five eplsodes of structural deformations. Each episode of strutural defoma tion remained a variety of structural prints in the rocks of metamorphic basements. The stud ies from the relationships of metamorphism and deformation and from structural compara tions of the different periods of metamorphic structure units show that D1 and D2 in Chencai group took place at about the same time to the main metamorphism of Chencai group, and they resulted from Luliang movement of Paleo -Proterozoic period ; the D3, D4 and D5 in Chencai group belong to the results of Jinning movement and Caledonian movement respec tively.