摘要
本文讨论了辽东青城子地区早元古宙辽吉岩套的构造变形作用与构造演化。作者提出了青城子推覆构造的三阶段演化模式。早期阶段,即第1变形幕形成了北西向转南西向的同斜倒转褶皱,构成了青城子推覆体的雏形;第2变形幕以剪切体制为主,辽吉花岗岩活化和底辟重就位形成了推覆体构造,并产生了逆冲型韧性剪切带;第3变形幕形成了叠加在推覆体构造上的北东向倾伏背斜、向斜构造,并使推覆体构造发生整体机械变位,最终奠定了青城子地区的宏观构造格局。
The paper discussed the structural deformation and evolution of the early Proterozoic Liaojitite Suite in Qingchengzi area and proposed a model of three stages for the Qingchengzi nappe: during the D_1 deformation NW--SW isoclinal folds formed as the embryo of the nappe; during the D_2 deformation, mainly in shear deformation, the nappe and reverse ductile shear zone formed due to the Liaojitite granite reactivating and diapiric re--locating; during the D_3 deformation NE plunging folds formed overlap- ping upon tbe nappe.
关键词
构造演化
推覆体
剪切带
早元古宙
Structural evolution Nappe Ductile shear zone Structure combination Qingchengzi East Liaoning
