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古地磁结果提供了东亚大陆增生的重要信息。下面总结一些近期发展的例子。 1.中国南北地块的最新视极移(APW)轨迹显示,南北地块的轨迹在中三叠纪以前是绝然不同的。在早中三叠纪,华北地块的古地磁极位于欧洲西北部,华南地块的极则位于太平洋的东北部,然而在中侏罗纪和晚些时候,中国南北地块的古地磁极在统计意义上就难以区分了。由此表明,在晚三叠纪—早侏罗纪,中国南北两大地块最终拼接成一个统一的构造单元,这个时间和有名的印支造山运动期是一致的。 2.在早石炭纪晚期开始,蒙古地块视极移轨迹和华北地块的视极移轨迹相似。但不同于西伯利亚地
Palaeomagnetic results provide important information on the proliferation of the East Asian continent. Here are some examples of recent developments. 1. The latest apparent pole shift (APW) trace of the South China block shows that the trajectories of the North South block before the Middle Triassic are absolutely different. In the early Triassic, the paleomagnetic poles of the North China block were located in the northwestern Europe and the South China block was located in the northeast of the Pacific Ocean. However, in the middle Jurassic and later, the paleomagnetic poles In the statistical sense it is difficult to distinguish. This shows that in the Late Triassic to Early Jurassic, the two big blocks in the north and the south of China eventually spliced into a unified tectonic unit, which coincides with the famous Indosinian orogeny period. 2. Beginning in the late Carboniferous, the apparent migration trajectories of the Mongolia block are similar to those of the North China block. But different from the Siberia