| 华北古陆的形成与构造演化史 |
| |
| 引用本文： | 牛树银,孙爱群,张建珍.华北古陆的形成与构造演化史[J].地学前缘,1997(Z2). |
| |
| 作者姓名： | 牛树银 孙爱群 张建珍 |
| |
| 作者单位： | 石家庄经济学院 |
| |
| 基金项目： | 地质矿产部定向科研项目,地矿部百名跨世纪科技人才培养计划 |
| |
| 摘 要： | 以华北古陆为例，论述了地球演化史中经历的三大阶段：（１）古陆的形成阶段（４６００～１８００Ｍａ）：地球形成早期，以地幔对流为主导作用，到早太古宙出现初始古陆核，地幔对流驱动的地体拼贴和板底垫托是陆壳形成的主要方式；中太古宙开始出现一定规模的坳陷盆地，发育了基性火山岩 碎屑岩 镁质碳酸盐岩等表壳岩，同时伴随着大量中基性、花岗质岩浆活动；晚太古宙和早元古宙是陆壳形成的主要时期，并已具现今板块活动特征。地幔热柱与板块构造共同控制着地壳运动。（２）古陆稳定发展阶段（１８００～２５０Ｍａ）：地幔热柱活动较弱，古陆主要表现为缓慢的升降运动（造陆运动）。（３）地球新活动时期（２５０Ｍａ至今）：地幔热柱活动进入一个新的活跃时期。岩石圈发生明显的热减薄，地幔热柱表现为多级演化，并导致盆岭系的形成。
|
| 关 键 词： | 构造演化 地幔热柱 板块构造 华北古陆 |
THE FORMATION AND TECTONIC EVOLUTION OF THE NORTH CHINA PALAEOCONTINENT |
| |
| Niu Shuyin\ \ Sun Aiqun\ \ Zhang Jianzhen.THE FORMATION AND TECTONIC EVOLUTION OF THE NORTH CHINA PALAEOCONTINENT[J].Earth Science Frontiers,1997(Z2). |
| |
| Authors: | Niu Shuyin\ \ Sun Aiqun\ \ Zhang Jianzhen |
| |
| Abstract: | This paper discusses the three evolutionary stages of the Earth, as exemplified by the North China palaeocontinent: (1) the formation of the North China palaeocontinent (4600～1800Ma). During the early stage, the evolution of the Earth was dominated by mantle convection. Primary palaeocontinental nuclei appeared in the early Archean.The main formation form of the continental crust was landmass collage and rock slabs pile up under the plate driven by mantle convection. During the middle Archean, depression basin began to appear and basaltic volcanic rocks, clastic rock and magnesian carbonate rocks as well as basic to intermediate granitic intrusive rocks were all well developed in it. Late Archean and Early Proterozoic were the main period for the formation of continental crust. It has been shown that the characteristis of modern plate tectonics, and the crust movement was controlled by mantle plume and plate tectonics; (2) stable developing stage of palaeocontinent was shown mainly by slow vertical movement (land-forming movement); (3) modern activity of the Earth (250Ma～present). Mantle plume has come to a new active period and the thickness of the lithosphere is decreased. Mantle shows multiple step evolution which leads to the formation of the basin mountain system. |
| |
| Keywords: | structural evolution mantle plume plate tectonics North China palaeocontinent |
| 本文献已被 CNKI 等数据库收录！ |
