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中国沙漠  2018, Vol. 38 Issue (2): 252-261    DOI: 10.7522/j.issn.1000-694X.2017.00008
沙漠与沙漠化     
毛里塔尼亚努瓦克肖特沙丘粒度分布特征及其环境意义
周娜1,2,3, 尤源1,2,3, 雷加强1,3, 王永东1,3, 王海峰1
1. 中国科学院新疆生态与地理研究所 荒漠与绿洲生态国家重点实验室, 新疆 乌鲁木齐 830011;
2. 中国科学院大学 北京 100049;
3. 中国科学院中-非联合研究中心, 北京 100049
Characteristics of Sand Granularity and Its Environmental Significance in Nouakchott, Mauritania
Zhou Na1,2,3, You Yuan1,2,3, Lei Jiaqiang1,3, Wang Yongdong1,3, Wang Haifeng1
1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Sino-African Joint Research Center, Chinese Academy of Sciences, Beijing 100049, China
 全文: PDF(3756 KB)  
摘要: 毛里塔尼亚努瓦克肖特地区位于撒哈拉沙漠西部,基本被沙漠包围且常年遭受沙漠侵蚀,进行该地区沙漠粒度特征的研究,将对判别沙漠物质来源和沉积过程等具有重要参考意义。对努瓦克肖特周边纵向沙丘不同部位采集的50个沙样粒度进行分析。结果表明:沙丘沉积物的粒度以细沙和极细沙为主,两者所占比例超过60%;总体粒度要细于国内典型沙漠线性沙丘。沙丘东南坡、丘顶和西北坡整体上以细沙为主,其次为极细沙,二者含量依次递减,粉沙含量依次增加。沙丘沙粒径最细者为西北坡(5.13 φ),最粗者为东南坡(3.07 φ),分选性随粒径增加而变好。3个部位峰态存在明显差异,东南坡以中等和尖窄峰态为主,丘顶以尖窄峰态为主,西北坡为以宽平峰态为主,但三者均以正偏偏态为主。丘间地粒级级配趋势一致性最好,均以细沙为主,平均粒径大于沙丘各部位,平均粒径为2.76 φ,分选性优于沙丘,全为近对称中等峰态。该地区地表沙粒沉积环境和成因复杂,超过70%的沙样为风成沉积造成,其余为沿岸沉积造成。
关键词: 粒度毛里塔尼亚西非沉积环境    
Abstract: The Nouakchott, Mauritania is located in the west of the world's largest tropical Sahara Desert. The local ecology is seriously threated by desertification. Studying the grain size characteristics in this area is important because it plays a key role in distinguishing the sedimentary environment and the source of the dust. In present study, 50 sediment samples from different positions of longitudinal dunes were collected and analyzed by means of sieving. The longitudinal dunes can be divided into three parts including southeast slope, top, and northwest slope, which are mainly composed of fine sand and very fine sand which together account for more than 64% in total sand. It is finer than sands in the longitudinal dunes in China. Sediment form southeast slope with highest content of fine sand and very fine sand, and with lowest content of silty sand, while sediment form northwest slope with lowest content of fine sand and very fine sand, but with highest content of silty sand. The grain size parameters show that the finest and the coarsest grains can be found on the northwest slope and southeast slope, respectively. In addition, kurtosis of southeast slope, top, and northwest slope represent leptokurtic or mesokurtic, leptokurtic, and platykurtic, respectively. Moreover, all the three parts exhibit a positively skewness distribution. The sediments from inter-dunes mainly composed of fine sand and have a mean grain size of 2.76 φ, which are coarser and better sorted than dune sands and with an approximately symmetric mesokurtic distribution. The sedimentary environment and origins of the surface sand in the area are varied, more than 70% of the sand samples are dominate by wind, while others are dominated by littoral deposits.
Key words: grain size    Mauritania    west Africa    sedimentary environment
收稿日期: 2016-11-28 出版日期: 2018-03-20
ZTFLH:  P951  
基金资助: 科技部国际合作项目(2010DFB34020);中国科学院中-非联合研究中心项目(SAJC201610);科技部科技伙伴计划资助项目(非洲绿色长城建设适宜技术合作研究与示范)
通讯作者: 雷加强(E-mail:leijiaqiang@hotmail.com)     E-mail: leijiaqiang@hotmail.com
作者简介: 周娜(1984-),女,新疆乌鲁木齐人,博士研究生,主要从事荒漠环境研究。E-mail:zhouna118@hotmail.com。
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引用本文:

周娜, 尤源, 雷加强, 王永东, 王海峰. 毛里塔尼亚努瓦克肖特沙丘粒度分布特征及其环境意义[J]. 中国沙漠, 2018, 38(2): 252-261.

Zhou Na, You Yuan, Lei Jiaqiang, Wang Yongdong, Wang Haifeng. Characteristics of Sand Granularity and Its Environmental Significance in Nouakchott, Mauritania. JOURNAL OF DESERT RESEARCH, 2018, 38(2): 252-261.

链接本文:

http://www.desert.ac.cn/CN/10.7522/j.issn.1000-694X.2017.00008        http://www.desert.ac.cn/CN/Y2018/V38/I2/252

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