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    中国及邻区沉积盆地群结构与构造演化探讨——来自长剖面的研究对比

    A discussion on architecture and tectonic evolution of basins in China and its adjacent areas:Evidence from new progress of the long profile

    • 摘要: 提要:由多陆块汇聚而成的亚洲大陆发育类型多样的沉积盆地,是认识盆地构造演化的理想地区。本文通过绘制4条穿过亚洲大陆不同盆地群的超长剖面图,探讨不同盆地的结构类型及沉积盆地群与板块边界、深部构造背景之间的关系。与其他大陆相比,亚洲大陆沉积盆地规模普遍小,原型盆地保存较差。在盆地基底组成上,时代差异较大。古老克拉通陆块基底上的盆地保存较好,而造山带、洋壳基底上的盆地沉降幅度较大,并且易被叠加改造。不同类型盆地的构造演化受控于板块构造边界作用。由于亚洲大陆板块边界运动性质多变和陆块规模较小,造成其盆地群构造上强烈不稳定。中亚、特提斯、西太平洋三大构造域,西伯利亚、印度、华北、塔里木、扬子、印支等克拉通陆块群,及地幔柱活动(如西西伯利亚玄武岩省)的时空叠加,控制了亚洲盆地群显生宙以来的构造演化,并造成其盆地类型和后期保存的明显差异。

       

      Abstract: Abstract:Due to the convergence of multiple continental blocks and the development of many different types of sedimentary basins, Asian continent is an ideal place for studying the geological evolution of basins. This paper is focused on analysis of basin architecture, relationships between basin group and plate boundary, basin group and basement structure by drawing 4 long inter-continent profiles. Studies show that scales of sedimentary basins in Asian are generally small, the prototype basins have been poorly preserved, and the ages of basin basements are greatly different in contrast with other continents. Basins developed upon cratonic basement are relatively well preserved, while those overlying on the orogenic belt and oceanic crust basement have larger scale of subsidence, and are easily reworked. The changeable movement of plate tectonic boundary and smaller scale of landmass have resulted in a strong instability in the basin structure. The temporal and spatial superimposition between three big tectonic realms (Central Asia, Tethys, West Pacific), a series of cratonic blocks (Siberia, India, North China, Tarim, Yangtze, Indosinian etc. ) and mantle plume activities, have controlled the tectonic evolution of Asian basins, and caused obvious differences in their types and late preservation.

       

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