| 坝上高原安固里淖粒度年纹层与环境变化 |
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| 引用本文： | 翟秋敏,李容全,郭志永.坝上高原安固里淖粒度年纹层与环境变化[J].地理科学,2002,22(3):331-335. |
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| 作者姓名： | 翟秋敏 李容全 郭志永 |
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| 作者单位： | 1. 河南大学环境与规划学院,河南,开封,475001
2. 北京师范大学资源与环境科学系,北京,100875 |
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| 基金项目： | 国家自然科学基金资助项目 (4 94710 67) |
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| 摘 要： | 在安固里淖湖心区获取一未扰动沉积物样柱，分析发现了由冬季风搬运物与湖心沉积共同形成的粒度年纹层，建立了纹层年表，恢复了安固里淖湖区8507aB.P，以来的环境变化过程。8507-5429aB.P。冬季风活动较弱，后期的所波动；5429-3244aB.P.冬季风活动较强，3244-2494aB.P。冬季风活动减弱；2494-1165aB.P。冬季风活动略有增强；1165aB.P以来，冬季风活动减弱。安固里小淖粒度年纹层反映的冬季风变化情况与我国北方地区同期的环境变化和海平面变化有很好的对应关系。
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| 关 键 词： | 粒度年纹层 环境变化 湖泊沉积 冬季风变化 海平面变化 |
| 文章编号： | 1000-0690(2002)03-0331-05 |
Annual Laminations of Grain Size in Angulinuo Lake and the Environmental Changes in Bashang Plateau |
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| ZHAI Qiu min ,LI Rong quan ,GUO Zhi yong.Annual Laminations of Grain Size in Angulinuo Lake and the Environmental Changes in Bashang Plateau[J].Scientia Geographica Sinica,2002,22(3):331-335. |
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| Authors: | ZHAI Qiu min LI Rong quan GUO Zhi yong |
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| Institution: | ZHAI Qiu min 1,LI Rong quan 2,GUO Zhi yong 1 |
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| Abstract: | Annual lamination plays an important role in the research of environmental changes. Through coring a sample mud column without disturbing it in the lacuster of Angulinuo Lake, getting some thin sections from the core, and observing the sections under scanning electronic microscope, the researchers have discovered annual laminations of grain size that are made up of lacustrine deposits and eolian deposits, and the eolian deposits are transported by winter monsoon. By counting the layers the researchers have set up a time scale of annual laminations, and by calculating the grains in each layer the researchers have reconstructed the palaeoenvironment around Angulinuo Lake since 8507 a B.P. During 8507-5429 a B.P., the winter monsoon was weaker; but in the latter time of the period, the monsoon was unstable. During 5429-3244 a B.P., the winter monsoon was stronger. In 3244-2494 a B.P., the winter monsoon became weaker. In 2494-1165 a B.P., winter monsoon became a little stronger. Since 1165 a B.P., the winter monsoon has become weaker. The changes of winter monsoon reflected by annual laminations of grain size in Angulinuo Lake correspond well to the environmental changes in the northern area of China and to the changes of the sea level in the same period.The weak period of the winter monsoon responds to the period of high sea level; while the strong period of the winter monsoon corresponds to the new periglacier stage and the period of the low sea level. And the unstability of the winter monsoon is in accord with the unstability of environment in existance in in the northern area of China. |
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| Keywords: | Angulinuo Lake annual laminations of grain size environmental changes lacustrine sediments |
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