浙西北江山─绍兴断裂带构造演化特征

江山—绍兴断裂带是中国南方最重要的构造带之一。它是江南陆块与华夏陆块神功运动形成的碰撞拼贴带。它表现出明显的多期变形、构造叠加的特征：神功运动形成近东西向平卧褶皱；印支运动沿断裂带有向北西强烈的推覆挤压。断裂带不同时期的活动反映了不同特征的构造环境，形成不同的构造变形特征，并对两侧的地质历史具有明显的控制作用。

TECTONIC EVOLUTION AND DEFORMATIONAL FEATURES OF JIANGSHAN-SHAOXING FRACTURE ZONE IN NORTHWEASTERN ZHEJIANG

Jiangxhan-Shaoxing Fracture zone is one of the most imporatnt tectonic zones in southern China. It is a collision zone between Jiangnan landmass and Cathaysia landmass. It's movements in different stages represented different tectonic environments and deformational features, and di rectly controlled geological evolution history of both sides. Strong collision and compression dur ing Shenggong movement (at the end of Mesoproterozoic) resulted Shuangxiwu group into strong tectonic deformation to form recumbents or reclined folds with the axial direction closing to E-W, and the Weastem Zhejiang Foreland Basin was formed During Jinning movement (at the early of Lateproterozoic), the two landmass continued to oblique collision with magma intru sion. It made the collision zone more consolidated, moreover sinistral shear caused that Western Zhejiang Compressional Foreland Basin was changed into Western Zhejinag Tensional Down warped Basin. Owing to the change from tensional downwrap to collisonal compression between cathaysia landmass and Yangtze landmass during Caledonian stage, Jiangshan-shaoxing collision zone shown as a ductileshear zone, and the shearing direction was changed from sinistral to dex tral strike slip. During Indosinian movement, Cathaysia landmass occured large scale napping to ward north, not only it made all sediment in Western Zhejiang Foreland Basin and Dewnwraped Basin strong folding, but also a series of thrust-nappe structure was formed and caused Pre sinian formation thrust onto late strata along Jiangshan-shaoxing collision zone. During Yansha nian stage, the crust of coastal region of southeastern China came into envolutional stage of conti nental margin. Block faulting controlled development of Meso - cenozoic sedimrnt - volcanic basins. In south side of the collision zone a large scale Mesozoic volcanic rock developed, but in north side only a few sediment-volcanic basin developed. Along Jiangshan-shaoxing collision zone there were Meso-cenozoic fault subsidence basin showing a string of beads.