摘要
通过成因地层对比、构造形态和盆地演化过程分析，在黔中南至桂西鉴别出一条ＮＮＥ向延续的陆内软碰撞带。它是在伸展裂谷海盆地（再生陆间海）聚合封闭过程中，由活动大陆边缘向被动大陆边缘缓慢仰冲而形成的。与其同期形成的还有晚三叠世黔西滇东前陆盆地，萍乐残留弧后盆地和十万大山及龙岩后陆盆地。软碰撞带的出现，不仅掩盖了晚二叠世至中三叠世陆间海的深海沉积和洋壳基底，而且造成碰撞带两侧的地层、构造和古地理环境的不连续，同时对盆地矿产的分布和再富集也有直接影响。
A intracontinental soft collision foldbelt elongated to NNE orienation is recognized by the aid of genetic stratigraphic comparison, structural form and basin evolution analysis in Middle and South Guizhou and East Yunnan provinces. This soft collision foldbelt was formed by a coarse that the active continetal margin was overthrusting upon passive continental margin during convergent stage of the rifted oceanic basin due to lithospheric stretching. There are some synchronous sedimentary basins formed during Late Triassic, including West Guizhou and East Yunnan foreland basin, Pingle relict back-arc basin, one hundred thousands mountains backland basin and Longyan backland basin. Not only the soft collision foldbelt had covered the deep marine deposits and the oceanic crust of the intercontinental ocean developed in Late Permian to Medium Triassic, but also resulted in disconnection of the stratigraphic units, structural feature and paleogeographic environments between both sides of the soft collision foldbelt. Moreover, development of the soft collision foldbelt had a great influence upon the distribution and concentration of the basin ore deposits.
出处
《地质科学》
CAS
CSCD
北大核心
1995年第1期29-39,共11页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金
关键词
陆内
软碰撞带
前陆盆地
裂谷海
聚合封闭
ntracontinental soft collision foldbelt, depositional system tract,tectono-depositional episode, foreland basin, backland basin
