| 基于粒度参数特征对黄河后套平原段岩芯沉积环境的分析 |
| |
| 引用本文： | 李富强,高红山,张连科,李宗盟,庞红丽,潘保田.基于粒度参数特征对黄河后套平原段岩芯沉积环境的分析[J].沉积学报,2019,37(6):1234-1243. |
| |
| 作者姓名： | 李富强 高红山 张连科 李宗盟 庞红丽 潘保田 |
| |
| 作者单位： | 兰州大学资源环境学院西部环境教育部重点实验室,兰州 730000;兰州大学资源环境学院西部环境教育部重点实验室,兰州 730000;甘肃省科学院地质自然灾害防治研究所,兰州 730000;信阳师范学院地理科学学院,河南信阳 464000 |
| |
| 基金项目： | 国家自然科学基金项目（41471008，41730637，41571003） |
| |
| 摘 要： | 基于现代地表不同沉积环境组成物质的粒度组合特征，采用粒度特征的多种图解方法建立了沉积物粒度特征与沉积环境之间的对应关系，进而对黄河后套平原段2个深约20 m的钻孔岩芯进行了沉积相的解译。研究结果表明，晚第四纪该区钻孔沉积环境经历了多次相变，但仍以河床相为主，分别占到68%和57%，说明黄河在该区存在多个沉积旋回，摆动频繁；而沙漠相仅在钻孔DKZ04顶部出现，指示了磴口以西乌兰布和北缘连续的沙漠景观出现的时代较晚，可能是2 000年以来受黄河河道向南迁移废弃导致的湖泊干涸和荒漠化以及大规模人类活动导致的土地荒漠化共同作用而形成的。
|
| 关 键 词： | 粒度特征 沉积相 后套平原 黄河 |
| 收稿时间： | 2018-12-12 |
Grain size Characteristics and Evolution of Core Sedimentary Environment in the Houtao Plain Reach of the Yellow River |
| |
| Institution: | 1.Key Laboratory of Western China's Environmental Systems, Ministry of Education, Lanzhou University, Lanzhou 730000, China;2.Institute of Geological and National Hazards Control, Gansu Academy of Sciences, Lanzhou 730000, China;3.School of Geographic Sciences, Xinyang Normal University, Xinyang, Henan 464000, China |
| |
| Abstract: | Sediment grain size parameters provide important information about depositional processes and environments because the size range,mixing and sorting of sediment populations vary systematically in response to the sedimentation processes,dynamics and provenance. Thus the analysis of textural parameters is the basis for determining the process/response behavior of individual sedimentary units and their environment. Grain size distribution distinguishes the surface sedimentary environment in the Houtao plain,and was therefore adopted in this sedimentary facies interpretation of two drill cores from the Houtao plain reach of the Yellow River. The results show that the sedimentary environment underwent many transformations,dominated by fluvial channel facies(68% in Core DKZ04, and 57% in Core HDZ04). This indicates that the channel of the Yellow River has experienced extensive migration in this region. In addition,since aeolian sand appears only at the top of Core DKZ04,we speculate that the present desert landform of the northern Ulan Buh Desert started to form only 2 000 years ago,probably triggered by river migration and large-scale human activity. |
| |
| Keywords: | |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
