新疆策勒戈壁沉积物粒度特征及其沉积环境分析
Grain size characteristics and sedimentary environment of Cele Gobi sediments in Xinjiang
目的 揭示新疆策勒戈壁沉积物粒度特征及沉积环境,为戈壁沉积物沙尘释放、沉积环境演变及合理利用土地资源、减少沙尘灾害提供理论依据和科学支撑。 方法 以新疆策勒戈壁为研究区,通过野外实地调查与沉积物粒度以及磁化率的研究,对新疆策勒戈壁沉积物的粒度分布特征及其沉积环境进行分析。 结果 戈壁表层0~2 cm沉积物受到风蚀与降尘的影响较大,表层沉积物较粗粒级含量随着海拔降低呈现出逐渐增大的趋势,2~40、40~80 cm深度沉积物总体上受洪水的作用较大,沉积物较粗粒级含量随着海拔降低呈现出先减少后增大的趋势; 在戈壁各剖面各深度中,沉积物粒度分布频率曲线大部分为双峰曲线,说明沉积物来源是多源的,粒径组成中跃移组分占绝对优势,跃移的平均含量为49.43%;戈壁各剖面沉积物的平均粒径随海拔降低呈现出先变细后变粗的趋势,平均粒径介于56.08~139.71 µm;除剖面2外,其余各剖面均属于差分选性,偏度为负偏与极负偏,峰态均为窄或极窄峰态;0~2 cm深度沉积物磁化率值受到风蚀与降尘的影响较大,明显大于下层沉积物磁化率值,2~40、40~80 cm深度的沉积物可能为同一时期沉积,且沉积环境与沉积动力相同;沉积物的沉积环境主要以水成沉积环境为主。 结论 新疆策勒戈壁表层0~2 cm沉积物以风蚀与降尘为主,沉积环境主要是以水成沉积环境为主。
Objective To reveal the grain size characteristics and sedimentary environment of sediments in Cele Gobi in Xinjiang,and to provide theoretical basis and scientific support for the release of sedimentary dust,the evolution of sedimentary environment,the rational use of land resources and the reduction of dust disasters. Method Taking Cele Gobi in Xinjiang as the research area,the grain size distribution characteristics and sedimentary environment of sediments were analyzed by field investigation,particle size and magnetic susceptibility study. Result The gobi surface of 0~2 cm sediment under the influence of wind erosion and dust is larger,surface sediment content of coarser grained as lower altitudes shows a gradually increasing trend,2~40,40~80 cm depth sediment by flood is larger,the effect of the total sediment is relatively coarse grained content as the tendency of increase with the lower altitudes showed reduced after.The frequency curves of sediment particle size distribution in each gobi section and each depth are mostly bimodal curves,indicating that the sediment source is multi-source,and the saltation component is the absolutely dominant particle size composition,the average content of saltation is 49.43%.With the decrease in altitude,the average particle size of sediments in the gobi sections first became fine and then coarse,with the average particle size ranging from 56.08 µm to 139.71 µm.Except for section 2,all other sections belong to differential sorting,with negative skewness and very negative skewness,and narrow or very narrow peak state.The magnetic susceptibility of the sediments at 0~2 cm depth was strongly affected by wind erosion and dust fall,which was significantly higher than that of the underlying sediments.The sediments at 2~40 cm depth and 40~80 cm depth may have been deposited at the same time,and the sedimentary environment and sedimentary dynamics were the same. Conclusion Wind erosion and dust fall are the main causes of the 0~2 cm sediments in the surface layer of the Cele Gobi in Xinjiang,and the sedimentary environment is mainly hydrogenic sedimentary environment.
gobi / grain size analysis / mangetic susceptibility / sedimentary environment / Cele
| [1] |
高抒.沉积物粒径趋势分析:原理与应用条件[J].沉积学报,2009,27(5):826-836. |
| [2] |
卢连战,史正涛.沉积物粒度参数内涵及计算方法的解析[J].环境科学与管理,2010,35(6):54-60. |
| [3] |
R,Passega.Grain size representation by CM patterns as a geologic tool[J].Journal of Sedimentary Research,1964,34(4):830-847. |
| [4] |
王友郡,贾佳,高福元, |
| [5] |
格拉西莫夫,王乃樑,陈静生, |
| [6] |
冯益明,吴波,姚爱冬, |
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
张克存,屈建军,俎瑞平, |
| [11] |
谭立海,张伟民,屈建军, |
| [12] |
曹晓阳,冯益明.噶顺戈壁地表砾石粒度特征分析[J].中国水土保持科学,2016,14(1):46-52. |
| [13] |
曹晓阳,穆悦,曹晓明, |
| [14] |
穆悦,冯益明,高翔, |
| [15] |
张正偲,潘凯佳,梁爱民, |
| [16] |
王丽琴,李红丽,董智, |
| [17] |
张德魁,安富博,赵艳丽, |
| [18] |
肖靖安,裴亮,孙莉英, |
| [19] |
|
| [20] |
|
| [21] |
史运坤,鄂崇毅,张晶, |
| [22] |
王建,刘泽纯,姜文英, |
| [23] |
颜长珍,王一谋,冯毓荪, |
| [24] |
赵强,张希明.策勒戈壁盐生草种群特征的初步研究[J].干旱区研究,2003(3):221-225. |
| [25] |
毛东雷,蔡富艳,方登先, |
| [26] |
开买尔古丽·阿不来提,毛东雷,王雪梅, |
| [27] |
钱亦兵,张希明,李晓明.塔克拉玛干沙漠南缘绿洲沙物质粒度特征[J].中国沙漠,1995(2):131-135. |
| [28] |
|
| [29] |
|
| [30] |
|
| [31] |
李昌志,王裕宜.泥石流、冰碛和河湖沉积物的粒度特征及判别[J].山地学报,1999(1):51-55. |
| [32] |
高君亮,吴波,庞营军, |
| [33] |
杨佐涛.戈壁与绿洲内的风向风速关系:以新疆策勒县为例[J].中国沙漠,1990,10(3):36-42. |
| [34] |
毛东雷,蔡富艳,雷加强, |
| [35] |
刘茜雅,王海兵,左合君, |
| [36] |
刘青松,邓成龙.磁化率及其环境意义[J].地球物理学报,2009,52(4):1041-1048. |
| [37] |
周晓红,赵景波.近120年来高陵渭河河漫滩沉积物磁化率指示的气候变化[J].水土保持学报,2007,21(3):196-200. |
教育部人文社会科学研究规划基金项目(18YJAZH064)
新疆师范大学人文社会科学重点研究基地丝绸之路经济带城市发展研究中心招标项目(XJNURWJD2019A06)
新疆师范大学“十三五”校级重点学科地理学招标项目(17SDKD0701)
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