造山带汇聚板块边缘沉积盆地的鉴别与恢复

Identification and reconstruction of tectonic archetype of the sedimentary basin within the orogenic belt developed along convergent margin

大洋俯冲和大陆碰撞是板块汇聚过程中的有机连续过程,也是造山带形成的两种基本造山作用方式。不同的造山作用过程形成不同类型的沉积盆地和填充序列,沉积盆地性质的改变和沉积物源区变化是造山作用方式和时限的最直接体现。沉积盆地是造山带重要大地构造相单元之一,完整记录了板块边缘动力学过程和构造演化以及造山作用方式和时限。沉积盆地构造原型鉴别与恢复是造山带结构-属性解剖的重要内容之一。视沉积盆地与相邻大地构造相的演化为统一整体,以填充物和沉积物源区作为链接沉积盆地和造山带的纽带,系统地精细解剖填充物组成和沉积相以及沉积物源区时空变化系列,准确鉴别并恢复造山带沉积盆地构造原型,是获取大陆碰撞方式和时限的沉积-地层判别标志的有效方法之一。

Ocean subduction and continental collision are an integrally continuous process of plate convergence and are also two basic patterns of orogeny. Different types of sedimentary basins and filling sequences were formed in different processes of orogeny,and the changes of their tectonic settings and source areas are the most direct manifestation of orogeny patterns and timing limit.Sedimentary basin is one of important tectonic facies of orogenic belt,which comprehensively records dynamic process and tectonic affinity of plate boundaries as well as orogeny patterns and time limit. Identification and reconstruction of tectonic archetype of the sedimentary basin is one of important subject of anatomy of composition and nature of orogenic belt. Considering sedimentary basins and adjacent tectonic facies as an integrated body and basin fills and sources as links of sedimentary basins and orogenic belts,and systemically detailed anatomy of spatial and temporal variation of components,sedimentary facies,and source areas of basin fillings,accurate identification and reconstruction of tectonic archetype of sedimentary basins within orogenic belt is one of effective methods of obtaining sedimentary-stratigraphic markers to discriminate continental collision patterns and timing limit.