赣杭构造带区域大地构造背景的探讨

DISCUSSION ON REGIONAL GEOTECTONIC SETTING OF GANHANG TECTONIC BELT

华南前寒武纪构造格架的确立，是在长期研究中不断取得进展并完善的。通过前寒武纪建造、构造综合分析表明：华夏古陆是一个被肢解了的早前寒武纪古大陆；中元古代晚期浙西—赣东北为华夏古陆的活动陆缘；武陵运动是华南最重要的造山运动，华夏古陆与扬子地块在赣东北断裂带碰撞，形成了统一的“华南古大陆”；晚元古代由于区域地质条件不同，各地碰撞后的构造演化有明显的差异。赣杭断裂带是一条晚元古代早期“Ａ”

The knowledge of Precambrian structural framework in southern China has been progressed during a long period of study.Based on the comprehensive analysis on Precambrian formations and tectonic evolution the following conclusions are made:(1) The Cathaysia is a desintegrated Early Precambrian oldland;(2) Zhexi Gandongbei region was an active continental margin;(3) The Wuling orogeny is the most important one in the evolution of southern China during which a collision between the Cathaysia and Yangzi blocks occurred forming the united South China Oldland;(4) The Late Proterozoic tectonic evolution in various areas showed obvious difference because of the difference in regional geology.In a word,the Ganhang fault belt was an 'A' subduction zone in the early stage of Late Proterozoic.