| 摘要: |
| 五台运动表现的地区,主要是在华北的五台山区、太行山区、冀东、鲁西、豫西地区以及东北的辽东地区,其绝对年龄时限大致为22—23亿年。现已证实,经历五台运动后,华北地区的克拉通化更加明显,被认为属于中国境内克拉通化最早与最完备的地区。 |
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| Controls of Proterozoic Geotectonie Framework in China on Sedimentary Processes |
| Li Hanyu, An Yankai |
(1. Chengdu College of Geology;
2. Tianjin University of Broadcast and Television) |
| Abstract: |
| This paper deals with the relationship between the Precambrian geotectonic framework in China and sedimentary processes. During late Early Proterozoic, the Wutai Movement once led to the formation of aulacogens within the cratons in China which were filled with sedimentary-volcanic sequences with great thickness which were ascribed to the products of Luliang tectonic cycles. The Hutuo Group may represent the location of the troughs at that time. Later in Middle Proterozoic times, the cyclic deposits occurred on the margins of the ancient land. The Sibao Movement played an important part in the consolidation and overgrowth of the Late Proterozoic continental blocks in South China. The Sinian was formed right after the Jinning Movement. It is believed that South China was then in the arc-trench system on the active continental margins, whereas in North China. the northern borderland is thought to be the passive continental margins where the Sinian is generally absent. In addition, three glacial periods marked by the existence of the tills have been distinguished in northwestern China. The Sinian till beds in South China may also be related to the worldwide colder climate. It follows that the Proterozoic geotectonic framework may be very important for the sedimentary facies analysis and palaeogeographic reconstruction in China. |
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