img

官方微信

  • CN 62-1070/P
  • ISSN 1000-694X
  • 双月刊 创刊于1981年
高级检索
沙漠与沙漠化

柴达木盆地灌丛沙丘稀土元素地球化学特征与物源

  • 凌智永 ,
  • 王建萍 ,
  • 陈亮 ,
  • 芦宝良
展开
  • 1. 兰州大学 资源环境学院 西部环境教育部重点实验室, 甘肃 兰州 730000;
    2. 中国科学院青海盐湖研究所 盐湖资源综合高效利用重点实验室, 青海 西宁 810008
凌智永(1983-),男,河南商丘人,博士研究生,助理研究员,主要从事干旱环境与气候变化研究。E-mail:lingzhiyong@foxmail.com

收稿日期: 2017-05-09

  修回日期: 2017-07-11

  网络出版日期: 2018-11-03

基金资助

国家自然科学基金项目(41501001,41671521,41471454);青海省科技基础平台项目(2018-ZJ-T03)

Rare Earth Elements' Geochemical Characteristics of Nebkhas in the Qaidam Basin and the Provenance

  • Ling Zhiyong ,
  • Wang Jianping ,
  • Chen Liang ,
  • Lu Baoliang
Expand
  • 1. Key Laboratory of West China's Environmental System, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
    2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China

Received date: 2017-05-09

  Revised date: 2017-07-11

  Online published: 2018-11-03

摘要

分析了柴达木盆地灌丛沙丘剖面风沙沉积物中稀土元素及其相关特征参数、分布模式和(La/Yb)N-REE(稀土元素)物源特征。结果表明:灌丛沙丘剖面风沙沉积物中REE值100.52~163.47 μg·g-1,接近于新疆灰钙土,而略低于中国黄土;LREE(轻稀土元素)值87.80~144.65 μg·g-1,占总量86.62%~90.53%,决定了稀土总量的变化。总体表现为LREE相对富集,而HREE(重稀土元素)丰度相对较低,分馏特征基本相似,呈斜"L"型缓右倾斜,Eu大致呈现中度负异常的分配模式,而Ce未表现出明显异常,且更多地反映了其物源特性。其物源主要由东昆仑北麓冲积扇碎屑沉积物质经过风化、搬运、沉积而成,而并非来自于干旱期的湖底剥蚀物。总体而言,灌丛沙丘沉积过程稀土元素分异特征反映了灌丛沙丘发育时期柴达木盆地总体处于干燥的气候环境,化学风化作用弱,植被发育相对较差,成壤作用不明显。

本文引用格式

凌智永 , 王建萍 , 陈亮 , 芦宝良 . 柴达木盆地灌丛沙丘稀土元素地球化学特征与物源[J]. 中国沙漠, 2018 , 38(5) : 963 -971 . DOI: 10.7522/j.issn.1000-694X.2017.00065

Abstract

Rare Earth Elements (REE) are widely used as trace elements in provenance studies of various sediments, and their characteristics also can record the evolution of environment more detailly. Therefore, they are widely used as an important indicator in studies of paleoclimate changes. The relationships between REE characteristics and environmental change on aeolian deposits have intensively been investigated in the Chinese Loess Plateau. However, the relationships between REE and paleoenvironment recorded by aeolian sediments of nebkhas in the Qaidam basin are still poorly understood. So the REE characteristics and environmental implication revealed by aeolian sedimental profiles of nebkhas in the Qaidam basin were studied. The results show that REE values of nebkhas' profiles vary from 100.527 μg·g-1 to 163.47 μg·g-1, and they are close to the REE values of Xinjiang Sierozem, but slightly lower than the Chinese loess. The LREE values determined the changes of the total content of REE with a range of 87.80~144.65 μg·g-1, which percentage changes from 86.62% to 90.53%. Overall, the LREE is relative enrichment and relatively low HREE abundance, with similar fractionated characteristics of REE. The distribution patterns of REE are the slowly gradient "L" types, and distribution patterns of Eu elements are moderate negative anomaly, and Ce elements show no obvious abnormality and more reflect their source features. The source of nebkhas sediments is mainly composed of detrital deposits material which come from the alluvial fans located in northern slope of East Kunlun, not from the lakes bottom erosion in the drought periods. After weathering, transportation and deposition, the clastic sediments become the aeolian sediments of nebkhas in southern of the Qaidam basin. The differentiation characteristics of rare earth elements primely record the regional climate and environmental changes by the development of nebkhas in the Qaidam basin. On the whole, the characteristics of REEs revealed dry climate condition in the whole development of nebkhas in the Qaidam basin, with weak chemical weathering, relatively poor vegetation growth condition, and the pedogenesis effect is not obvious.

参考文献

[1] Chen J,Li G,Yang J,et al.Nd and Sr isotopic characteristics of Chinese deserts:implications for the provenances of Asian dust[J].Geochimica et Cosmochimica Acta,2007,71:3904-3914.
[2] 邱新法,曾艳,缪启龙.我国沙尘暴的时空分布规律及其源地和移动路径[J].地理学报,2001,56(13):316-322.
[3] Li G J,Chen J,Ji J F,et al.Natural and anthropogenic sources of East Asian dust[J].Geology,2009,37:727-730.
[4] Pullen A,Kapp P,McCallister A T,et al.Qaidam Basin and northern Tibetan Plateau as dust sources for the Chinese Loess Plateau and paleoclimatic implications[J].Geology,2011,39:1031-1034.
[5] Yu L P,Lai Z P.OSL chronology andpalaeoclimatic implications of aeolian sediments in the Qaidam Basin of the northeastern Qinghai-Tibetan Plateau[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2012,337/338:120-129.
[6] Yu L P,Lai Z P,An P.OSL chronology andpaleoclimatic implications of paleodunes in the middle and southwestern Qaidam Basin,Qinghai-Tibetan Plateau[J].Sciences in Cold and Arid Regions,2013,5(2):211-219.
[7] Lupeng Yu,Zhongping Lai.Holocene climate change inferred from stratigraphy and OSL chronologyof aeolian sediments in the Qaidam Basin,northeastern Qinghai-Tibetan Plateau[J].Quaternary Research,2014,81,488-499.
[8] 曾永年,冯兆东,曹广超.末次冰期以来柴达木盆地沙漠形成与演化[J].地理学报,2003,58(3):452-457.
[9] Wang X M,Xiao H L,Li J C,et al.Nebkha development and its relationship to environmental change in the Alaxa Plateau,China[J].Environmental Geology,2008,56:359-365.
[10] Wang X M,Zhang C X,Zhang J W,et al.Nebkha formation:implications for reconstructing environmental changes over the past several centuries in the Ala Shan Plateau,China[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2010,297:697-706.
[11] Christopher L S,Randel T C,Steven L F,et al.Relict nebkhas (pimple mounds) record prolonged late Holocene drought in the forested region of south-central United States[J].Quaternary Research,2009,71:329-339.
[12] Lang L L,Wang X M,Hasi E,et al.Nebkha (coppice dune) formation and significance to environmental change reconstructions in arid and semiarid areas[J].Journal of Geographical Sciences,2013,23(2):344-358.
[13] Lang,L L,Wang,X M,Hua T,et al.Moisture availability over the past five centuries indicated by carbon isotopes of Tamarix taklamakanensis leaves in a nebkha profile in the Central Taklimakan Desert,NW China[J].Aeolian Research,2013,11:101-108.
[14] 王中刚,于学元,赵振华.稀土元素地球化学[M].北京:科学出版社,1989:5-16.
[15] Nesbitt H W.Mobility and fractionation of rare earth elements during weathering of a granodiorite[J].Nature,1979,279:206-210.
[16] Daux V,Crovisier J L,Hemmond C,et al.Geochemical evolution of basalt rocks subjected to weathering:fate of the major elements,rare earth elements and thorium[J].Geochimica et Cosmochimica Acta,1994,58:4941-4954.
[17] Zhang H C,Zhang W X,Chang F Q,et al.Geochemical fractionation of rare earth elements in lacustrine deposits from Qaidam basin[J].Science in China Series D:Earth Sciences,2009,52(11):1703-1713.
[18] Johansson K H,Berry W L,David A B,et al.Rare earth element concentrations and speciation in alkaline lakes from the western U.S.A.[J].Geophysical Research Letters,1994,21(9):773-776.
[19] Xiong S F,Sun D H,Ding Z L,et al.Aeolian origin of the red earth in South East China[J].Journal of Quaternary Science,2002,17(2):181-191.
[20] Yang S Y,Jung H S,Li C X.Two unique weathering regimes in the Changjiang and Huanghe drainage basins:geochemical evidence from river sediments[J].Sedimentary Geology,2004,164(1/2):19-34.
[21] Yang X P,Liu Y S,Li C Z,et al.Rare earth elements ofeolian deposits in North China and their implications for determining the provenance of dust storms in Beijing[J].Geomorphology,2007,87(4):365-377.
[22] Hao Q Z,Guo Z T,Qiao Y S,et al.Geochemical evidence for the provenance of Middle Pleistocene loess deposits in Southern China[J].Quaternary Science Reviews,2010,29(23/24):3317-3326.
[23] Ding Z L,Sun J M,Yang S L,et al.Geochemistry of the Pliocene red clay formation in the Chinese Loess Plateau and implications for its origin,source provenance andpaleoclimate change[J].Geochimica et Cosmochimica Acta,2001,65(6):901-913.
[24] Ferrat M,Weiss D J,Strekopytov S,et al.Improved provenance tracing of Asian dust sources using rare earth elements and selected trace elements for palaeomonsoon studies on the eastern Tibetan Plateau[J].Geochimica et Cosmochimica Acta,2011,75(21):6374-6399.
[25] Wen Q Z,Yu S H,Sun F Q,et al.Rare-earth elements inLuochuan Loess section,Shanxi Province[J].Geochemistry,1985,4(2):172-180.
[26] German C R,Elderfield H.Application of the Ce anomaly as a paleoredox indicator:the ground rules[J].Paleoceanography,1990,5(5):823-833.
[27] Tanaka K,Akagawab F,Yamamoto K,et al.Rare earth element geochemistry of Lake Baikal sediment:its implication for geochemical response to climate change during the Last Glacial/Interglacial transition[J].Quaternary Science Reviews,2007,26(9-10):1362-1368.
[28] Mao L J,Mo D W,Li M L,et al.The rare earth element compositions of sediments from the loess tableland in the Liyang Plain,Southern China:implication for provenance and weathering intensity[J].Environment Earth Science,2011,62(8):1609-1617.
[29] 陈秀玲,李志忠,贾丽敏,等.新疆伊犁河谷沙漠沉积的稀土元素特征及其环境意义[J].第四纪研究,2103,33(2):368-375.
[30] 伍光和,张志良,胡双熙,等.柴达木地盆地[M].兰州:兰州大学出版社,1990:48-57.
[31] 时兴合,赵燕宁,戴升,等.柴达木盆地40多年来的气候变化研究[J].中国沙漠,2005,25(1):123-128.
[32] 鲍锋,董治宝,张正偲.柴达木盆地风沙地貌区风况特征[J].中国沙漠,2015,35(3):549-554.
[33] 朱文彬,吕爱锋,贾邵凤.基于NDVI的柴达木盆地植被空间分异规律及影响因素[J].干旱区研究,2010,27(5):691-700.
[34] 钟泽兵,周国英,杨路存,等.柴达木盆地几种荒漠灌丛植被的生物量分配格局[J].中国沙漠,2014,34(4):1042-1048.
[35] 丁之勇,马龙,吉力力·阿不都外力,等.新疆艾比湖湖泊沉积物元素地球化学记录及其生态环境意义[J].中国沙漠,2018,38(1):101-110.
[36] 李瑞保,裴先治,李佐臣,等.东昆仑南缘布青山构造混杂带得力斯坦南MOR型玄武岩地质、地球化学特征及岩石成因[J].地球科学-中国地质大学学报,2015,40(7):1148-1162.
[37] Allegre C J,Minster J F.Quantitative models of trace element behavior in magmatic processes[J].Earth Planetary Science Letters,1978,38(1):1-25.
[38] 郭利成,陈秀玲,宋友桂,等.新疆伊犁盆地昭苏黄土剖面稀土元素特征[J].干旱区研究,2013,30(6):1004-1012.
[39] Ma Y J,Huo R K,Liu C Q.Speciation and fractionation of rare earth elements in a lateritic profile from southern China:identificationof the carriers of Ce anomalies[J].Geochimica et Cosmochimica Acta,2002,66(15A):471.
文章导航

/