| 柴达木盆地西部湖相地层风力侵蚀对黄土高原物源贡献的研究进展 |
| |
| 引用本文： | 李永国,安福元,张啟兴,赵洪菊.柴达木盆地西部湖相地层风力侵蚀对黄土高原物源贡献的研究进展[J].盐湖研究,2017,25(2):105-111. |
| |
| 作者姓名： | 李永国 安福元 张啟兴 赵洪菊 |
| |
| 作者单位： | 青海省水文地质工程地质环境地质调查院,青海省水文地质及地热地质重点实验室,青海 西宁 810008,中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室, 青海西宁 810008;青海省盐湖地质与环境重点实验室,青海西宁 810008,青海省水文地质工程地质环境地质调查院,青海省水文地质及地热地质重点实验室,青海 西宁 810008,青海省地质调查院,青海西宁 810008 |
| |
| 基金项目： | 国家自然科学基金项目(41401008)；青海省自然科学基金项目(2016-ZJ-926Q)和中国科学院“西部之光”项目资助 |
| |
| 摘 要： | 柴达木盆地是我国西北地区最干旱的盆地之一,常年盛行强劲的西北风,尤其在冬春季更甚。柴达木盆地西部地区自新生代以来沉积了巨厚的河湖相沉积。自上新世晚期以来,随着气候的逐步干化和盆地内部构造变形的加剧,该地区风力侵蚀地貌开始出现。早更新世出现的古盐壳和古雅丹地貌说明当时侵蚀已经相当剧烈。晚更新世以来,气候的极端干旱化和冰期的出现,更加促进了风蚀地貌的发育,在强劲的低空风力的雕刻下,形成了盆地西部几万平方千米的"百万雅丹"地貌,十分壮观。柴达木盆地不同地区地层的厚度和风蚀速率都不同,最大分别可达3 000 m和1.1 mm/yr,如此巨量的物质搬运必然为下风向的地区(都兰、青海湖地区、西宁盆地、黄土高原)的粉尘堆积提供可观的物源物质。研究表明,柴达木盆地西部被侵蚀的古湖相地层是上述地区,尤其是黄土高原重要的物源物质。随着研究的深入,其盆地内侵蚀物质输送到黄土高原的机制,已得到学界越来越清晰的认识。
|
| 关 键 词： | 风力侵蚀 湖相沉积 柴达木盆地西部地区 物源 黄土高原 |
| 收稿时间： | 2016/3/20 0:00:00 |
| 修稿时间： | 2016/4/8 0:00:00 |
Research Progress of the Lacustrine Strata Deflation for Western Qaidam Basin and Its Provenance Significance for Loess Plateau |
| |
| LI Yong-guo,AN Fu-yuan,ZHANG Qi-xing and ZHAO Hong-ju.Research Progress of the Lacustrine Strata Deflation for Western Qaidam Basin and Its Provenance Significance for Loess Plateau[J].Journal of Salt Lake Research,2017,25(2):105-111. |
| |
| Authors: | LI Yong-guo AN Fu-yuan ZHANG Qi-xing and ZHAO Hong-ju |
| |
| Institution: | Key Laboratory of Hydrogeology, Geothermal Geology of Qinghai Province, Survey Institute Of Hydrogeology,Engineering Geology and Environmental Geology of Qinghai Province, Xining 810008, China,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China;Key Laboratory For Salt Lake Geology And Environment of Qinghai Province, Xining, 810008, China,Key Laboratory of Hydrogeology, Geothermal Geology of Qinghai Province, Survey Institute Of Hydrogeology,Engineering Geology and Environmental Geology of Qinghai Province, Xining 810008, China and Qinghai Geological Survey Institute, Xining, 810008, China |
| |
| Abstract: | :Qaidam Basin is one of the most arid basins in the western China and dominates by the strong northwest wind, especially in winter and spring. Thousands kilometers thick lacustrine and fluvial sedimentary have been deposited in the basin since Cenozoic. However, initiation of the late Pliocene, it appeared the wind erosion in the western Qaidam Basin with the aridification of palaeoclimate and intensity of the tectonic deformation. The forming of palaeo-salt-crust and palaeo-yardangs indicated the deflation is rather drastic in later period. With the deteriorating of palaeoclimate and emerging of glacial periods since late Pleistocene, and strong wind sculpture the vast lacustrine sediments in western Qaidam Basin and then development of mega-yardangs landform. The thick of deflated strata and erosion rate in the basin are different, the most thickness reach to 3 kilometers and erosion rate is 1.1 mm/yr. So much deflated materials transportation contribute abundant dust to the downwind areas such as Dulan, Qinghai Lake, Xining area as well as Chinese Loess Plateau. Previous studies show that the Qaidam Basin is one of the most important source areas for aeolian deposit in Chinese Loess Plateau, this understanding is more and more accepted by Quaternary community. |
| |
| Keywords: | :Wind erosion Lacustrine strata Western Qaidam Basin Provenance Loess Plateau |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《盐湖研究》浏览原始摘要信息 |
| 点击此处可从《盐湖研究》下载免费的PDF全文 |
|
