论文部分内容阅读
华南武夷山北缘边界被绍兴—江山—东乡断裂带所限。该断裂带至少保留了三期构造事件的形迹。第一期发生在８００Ｍａ～９００Ｍａ的晚元古代，呈ＮＷ向ＳＥ的区域推覆韧剪变形运动，以构造混杂岩和区域绿片岩相角闪岩相变质、强烈的褶皱和韧剪变形为特征，对应于古洋盆关闭、华南复合地体与江南岛弧碰撞焊接过程。第二期发生在４５８Ｍａ～４２１Ｍａ的志留纪，表现为从北向南的韧剪变形运动，伴有左旋走滑韧性剪切，以糜棱岩化和进变质作用为特征，黑云母多变为硅线石。该期变形使第一期构造形迹被强烈迭加置换。其动力学背景与闽东南地体朝武夷山的拼贴增生事件有关。第三期属中生代陆内变形，是一种高构造位的左旋走滑脆性剪切，以岩石的破裂和岩块的水平位移为特征，并具转换拉伸性质，导致中生代火山沉积盆地的形成。
The boundary of the northern margin of Wuyi Mountain in South China is limited by the Shaoxing-Jiangshan-Dongxiang fault zone. The fault zone retains at least three traces of tectonic events. The first phase took place in the late Proterozoic from 800 Ma to 900 Ma, with a NW-SE thrust and ductile shear deformation movement to the formation of melange and regional green schist facies amphibolite facies metamorphism, strong folds and ductile shear deformation Features, corresponding to the closure of the ancient ocean basin, South China composite terrain and Jiangnan Island arc collision welding process. The second stage occurred in the Silurian from 458 Ma to 421 Ma, showing the ductile shear deformation movement from north to south with left-lateral strike-slip ductile shear, characterized by mylonitization and metamorphism. The biotite changed to Sillimanite The deformation of the first phase of the structural features are strongly superposed replacement. Its dynamical background is related to the collage accretion event toward Wuyishan in the southeast Fujian Province. The third stage belongs to the Mesozoic intracontinental deformation, which is a type of left-lateral strike-slip brittle shear with high tectonic positions characterized by rupture of rocks and horizontal displacement of rocks with transitional tensile properties leading to the formation of Mesozoic volcanic sedimentary basins .