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| 北京平原晚第四纪堆积期与史前大洪水 | |
| 引用本文： | 袁宝印,邓成龙,吕金波,金昌柱,吴玉书.北京平原晚第四纪堆积期与史前大洪水[J].第四纪研究,2002,22(5):474-482. |
| 作者姓名： | 袁宝印 邓成龙 吕金波 金昌柱 吴玉书 |
| 作者单位： | 1. 中国科学院地质与地球物理研究所,北京,100029 2. 国土资源部北京地质调查所,北京,102206 3. 中国科学院古脊椎动物与古人类研究所,北京,100044 4. 中国科学院植物研究所,北京,100093 |
| 基金项目： | 国家自然科学基金 (批准号 :5 9890 2 0 0 )重大资助项目 |
| 摘 要： | 通过北京平原地区东方广场剖面和小红门剖面第四纪地层、年代学、环境变迁、沉积相及孢粉分析等方面的研究发现，从大约0．1MaB.P.-22000aB.P.，北京平原地区形成以砂砾石沉积为主的洪积扇，此后开始进入北京平原形成时期。22000－12000aB.P.,气候干冷，永定河水量减少，平原沉积速率较低。进入冰后期以来，气候逐渐温暖湿润，永定河水量增加，山区风化物质被搬运至北京平原堆积下来。沉积以天然堤相，决口扇相为主，沉积速率大增。8000－4000aB.P.,沉积速率达到最大，出现晚第四纪堆积期，同时洪水频繁，恰好与传说中的史前大洪水时期相当。3000aB.P.以后，气候向干冷转化，永定河水量减少，人类生产力提高，抵御洪水能力增强，洪水给人类造成的威胁相对降低。 |
| 关 键 词： | 第四纪 北京平原 沉积速率 堆积期 史前大洪水 环境变迁 孢粉分析 |
| 修稿时间： | 2002年5月22日 |
A LATE QUATERNARY ACCUMULATION PERIOD AND THE PREHISTORIC FLOOD IN BEIJING PLAIN |
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| Abstract: | The Orient Square section and Xiaohongmen section in Beijing were studied in detail, and a accumulation picture of Beijing Plain is obtained. From 0.1 Ma to 22 000 a B.P., an alluvial fan consisting of gravel was formed in front of the Beijing mountain region. After that, Beijing Plain began to enter into its formation stage. From 22 000 a B.P. to 12 000 a B.P., the Beijing climate was dry and cold, so the water quantity of the Yongdinghe River reduced, and then the accumulated rate of Beijing Plain lowered. As a postglacial age came, the Beijing climate became warm and wet, weathering fragments formed in that glacial age were moved from the mountain region into Beijing Plain. The sediments formed are mainly of levee facies and burst fan facies. The accumulated rate obviously increased. From 8 000 a B.P. to 4 000 a B.P., an accumulation period with the maximum accumulation rate came as great flood occurred frequently. This period is just corresponding to the Prehistoric Flood in legend. After 3 000 a B.P., the climate again became dry and cold. At the same time the water quantity of the Yongdinghe River reduced again, but the human productivity raised and the ability for human to resist flood strengthened, although flood threats became relatively lower compared with the Prehistoric Flood. |
| Keywords: | Beijing plain accumulate rate accumulation period Prehistoric Flood |
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