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| 末次间冰期以来西宁市河谷沉积与环境 | |
| 引用本文： | 王萍,蒋汉朝,苏旭,严富华.末次间冰期以来西宁市河谷沉积与环境[J].第四纪研究,2008,28(2):253-263. |
| 作者姓名： | 王萍 蒋汉朝 苏旭 严富华 |
| 作者单位： | 1. 中国地震局地质研究所,中国地震局地震动力学国家重点实验室,北京,100029 2. 中国科学院地质与地球物理研究所,北京,100029 3. 青海省地震局,西宁,810000 |
| 基金项目： | 国家自然科学基金项目(批准号:40472090)，中国地震局“十五”重点项目(中国地震活断层探测技术系统——西宁市地震活动断层探测与地震危险性评价)(批准号:1-4-29)资助 |
| 摘 要： | 在西宁市区开展的钻探工作,获得了河谷平原区第四系的分布及沉积特征。通过对沉积厚度最大部位的2个钻孔岩芯的地层岩性、年代测试、孢粉组合及粒度分析等,探讨了西宁河谷平原区晚第四纪沉积与环境的关系。认为现今西宁市河谷平原内的主体沉积——低阶地沉积及上覆黄土堆积主要是末次间冰期旋回形成,在暖湿气候条件下沉积河流相砂砾石层,在干冷气候期接受风成黄土堆积,推测T3阶地形成于距今7.4万年前后气候由暖湿向干冷的过渡时期。 |
| 关 键 词： | 末次间冰期 河流阶地 钻探岩芯 光释光年龄 西宁 |
| 文章编号： | 1001-7410(2008)02-253-11 |
| 收稿时间： | 2007-12-25 |
| 修稿时间： | 2007年12月25 |
DEPOSITION IN XINING RIVER VALLEY AND ITS BEARING ON ENVIRONMENTAL CHARACTER SINCE THE LAST INTERGLACIAL PERIOD |
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| Wang Ping,Jiang Hanchao,Su Xu,Yan Fuhua.DEPOSITION IN XINING RIVER VALLEY AND ITS BEARING ON ENVIRONMENTAL CHARACTER SINCE THE LAST INTERGLACIAL PERIOD[J].Quaternary Sciences,2008,28(2):253-263. | |
| Authors: | Wang Ping Jiang Hanchao Su Xu Yan Fuhua |
| Institution: | 1. State Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration.Beijing 100029; 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029; 3. Earthquake Administration of Qinghai Province, Xining 810000 |
| Abstract: | Quaternary distribution and sedimentation of the Xining river valley plain were investigated by drilling analysis.Discussion on the relationship between the Late Quaternary deposition and environmental changes was carried out based on analyzing the stratigraphic lithology,OSL age,pollen and grain size of two cores from the thickest depositional sites.The results indicate that the main sediment in the present Xining river valley plain,mainly including lower terraces and overlying loess,has deposited since the last interglacial period.The maximum thickness is about 70m,including 25m conglomerate at maximum in the lower alluvial sediments.During the period of the past more than 100ka,three grades of terrace named as T1,T2,and T3 have formed along the Huangshui River and its distributary.Their vertical falls are 2～4m,12～14m,and 23～30m,respectively.The fluvial sand and gravel were deposited when the climate was warm and humid,during interglacial or interstadial periods,and the subsequent aeolian loess was deposited on the terraces during dry and cool period.Accordingly,T3 was formed at the climatic transition,about 74ka.Nevertheless,the detailed process of terrace formation and its correlation to other regions need further investigation. |
| Keywords: | last interglacial fluvial terrace drilling core OSL Xining |
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