| 引用本文: | 蒙丽,张自森,王书兵,刘加强,傅建利,蒋复初.四川汉源大树剖面沉积物年代与粒度特征初步研究.湖泊科学,2010,22(6):957-964. DOI:10.18307/2010.0621 |
| MENG Li,ZHANG Zisen,WANG Shubing,LIU Jiaqiang,FU Jianli,JIANG Fuchu.Ages and grain-size characteristics of Dashu sediment section in Hanyuan County, Sichuan Province. J. Lake Sci.2010,22(6):957-964. DOI:10.18307/2010.0621 |
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| 四川汉源大树剖面沉积物年代与粒度特征初步研究 |
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蒙丽1,2, 张自森3, 王书兵4,5, 刘加强2, 傅建利4,5, 蒋复初5,6
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1.重庆地质矿产研究院, 外生成矿与矿山环境重庆市重点实验室, 重庆 400042;2.中国地质科学院地质力学研究所, 北京 100083;3.河南有色地勘局, 郑州 450016;4.中国地质大学(北京)北京 100081;5.国土资源部新构造运动与地质灾害重点实验室, 北京 100081;6.中国科学院湖泊与环境国家重点实验室, 南京 210008
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| 摘要: |
| 汉源大树剖面厚11.2m,光释光测年结果显示其地质时代为中更新世晚期-晚更新世中期.频率曲线有两峰a型、三峰b型和带粗尾巴的三峰c型三种类型,具有1-2Φ、3-4Φ、4-5Φ、5-6.5Φ、6.5-8Φ、10-11Φ等6个众数,各众数在地层纵向各层段上变化趋势明显;具有a型频率曲线特征的沉积物反映湖水较深,而其余的则可能指示了水体较浅的滨浅湖相.粒度组成以粉砂为主,分选性较好,中值粒径平均为18.12μm.粘土与细粉砂、粉砂含量曲线呈正相关关系;中值粒径与砂、粗粉砂含量曲线也呈正相关关系,并与粘土含量曲线呈负相关关系.大树剖面粒度组成可分为八个沉积阶段,构成从细到粗的三个沉积旋回,各沉积阶段分别指示了不同的水动力条件. |
| 关键词: 汉源 年代 粒度特征 大树剖面 |
| DOI：10.18307/2010.0621 |
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| 基金项目:地质力学研究所基本科研业务费项目(DZLXJK200710);国家自然科学基金项目(40672111)资助 |
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| Ages and grain-size characteristics of Dashu sediment section in Hanyuan County, Sichuan Province |
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MENG Li1,2, ZHANG Zisen3, WANG Shubing4,5, LIU Jiaqiang2, FU Jianli4,5, JIANG Fuchu5,6
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1.Chongqing Key Laboratory of Exogenic Minerallization and Mine Environment, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, P. R. China;2.China University of Geosciences, Beijing 100083, P. R. China;3.Henan Nonferrous Geological Prospecting Bureau, Zhengzhou 450016, P. R. China;4.Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Land and Resources, Beijing 100081, P. R. China;5.Institute of Geomechanics CAGS, Beijing 100081, P. R. China;6.State Key Laboratory of Lake Science and Environment, Chinese Academy of Sciences, Nanjing 210008, P. R. China
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| Abstract: |
| The results OSL dating five lacusteine deposit samples from one 11, 2m thick profile, Dashu Village in Hanyuan County, show that they have been deposited since the Mid-Pleistocene to Late-Pleistocene. There were three types in the frequency curve of sedimentology including a-type with two peaks, b-type with three peaks and c-type with three peaks and a thick tail, showing six modes of 1-2Φ、3-4Φ、4-5Φ、5-6.5Φ、6.5-8Φ、10-11Φ、respectively in each layers, and presented significant trends in the mode changes. The a-type reflected characteristics of deep water sediments, and the rest two types indicated a shallow water in the offshore lake. Hie suspended sediments are mainly composed of better sorting silt with the median of 18.12μm. Significantly positive correlations are between clay and fine silt, silt. The median size is positive correlated with sand, but negative correlation with clay. The profile from the bottom upwards can be divided into eight sedimentary stages, constituting three depositional cycles from fine to coarse grains and suggesting the different hydrodynamic conditions. |
| Key words: Hanyuan County age grain-size characteristics Dashu section |
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