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Variations in rare earth elements with environmental factors in lake surface sediments from 17 lakes in western China

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Journal of Mountain Science 2021年第7期18卷 1811-1822页

作者： DU Ding-ding CHEN Liu-qin BAI Yong-hui HU Hai-ping School of Earth Sciences East China University of TechnologyNanchang 330013China State Key Laboratory of Nuclear Resources and Environment Nanchang 330013China School of Earth Sciences Lanzhou UniversityLanzhou 730000China

Numerous lakes in western China are excellent sites for understanding environmental ***,what dominates rare earth element(REE) variations are still under debate in the lake environmental *** this study,we selected 28 surface sediment samples from 17 lakes(*** lakes,small water bodies,etc.) in the QinghaiTibet Plateau and Xinjiang *** samples were analyzed to reveal the behavior of the REEs and major *** REE patterns are characterized by light rare earth element(LREE) enrichment,weak Ce anomaly(0.84-0.98,0.94 on average) and negative Eu anomaly(0.53-1.00,0.67 on average).The homogeneous REE patterns may reflect similar REE of the source ***,the REE abundances showed some significant *** this study,water chemistry data analyses inferred that the highly REE values appear possibly in the saltwater lake,and also related to carbonate mineral,whereas p H played a minor role in REE *** large-scale lakes(*** Bosten and lake Ulungur),the results showed that the relatively larger REE values are in the margins of ***,lower REE contents are towards the central *** study suggested that five major factors control the REE contents:(1) The REE tends to increase with the increase of the weathering intensity.(2) Likewise,heavy mineral(***,anatase,zircon,etc.) are probably primary in these sediments because they are highly enriched in the REE.(3) The contribution of Fe-Mn oxides is significant in sediments because their concentrations highly correlate with the REE.(4) The carbonate mineral(mainly calcite) played a significant role on the REE values in the lakes because the REEs are incorporated into the carbonate minerals generating the low REE concentrations.(5) Major element analysis,mineral analysis,and grain-size data analysis showed that the REE distribution is chiefly influenced by finer grain-size component of lake sediments due to the decreasing propor

关键词： Western China lake surface sediments Rare earth elements Environmental factors

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Influences of environmental factors on the modern 14C reservoir effects in Qinghai-Tibet Plateau lakes

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Journal of Mountain Science 2021年第12期18卷 3179-3189页

作者： DU Ding-ding LI Zhi-wen HU Hai-ping BAI Yong-hui LI Wen MUGHAL Muhammad Saleem QIAN Hai-Yan East China University of Technology Key Laboratory for Digital Land and Resources of Jiangxi ProvinceNanchang 330013China Lanzhou University School of Earth SciencesLanzhou 730000China School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000China Institute of Geology University of Azad Jammu and KashmirMuzaffarabad 13100Pakistan

The establishment of reliable age in the lake sediment profile mainly depends on the AMS 14C dating ***,the presence of the 14C lake reservoir effects(LREs)restricted for using radiocarbon dating in lake sediment,especially in dry and cold areas with a scarce plant cover in the Qinghai-Tibet ***,the discussion of influence factors of LREs is *** paper selected 15 lakes(17 sediment and 3 plant samples)in the Qinghai-Tibet Plateau to examine the distribution characteristics of the modern LREs and their main influencing *** our study area,14 lakes were all affected by the *** minimum 14C year is 5900 a BP towards the deep water area,whereas the maximum 14C year is up to 7185 a BP in the margins of lake *** maximum 14C year is up to 7750 a BP,and the minimum 14C year is present-day carbon in the 15 *** further study indicated that the LRE differences in individual lake are mostly owing to the contribution of exogenous *** results displayed that the LREs tended to increase with the increase of the salinity,moreover,the LREs of saltwater lakes or salt lakes were significantly larger than freshwater lakes due to the possible supply of old total dissolved inorganic carbon with a long residence time in the ***,the contribution of calcite played a significant role on the ***,the LREs differences are affected by the source of organic *** lake with groundwater supply shows large LRE due to likely being influenced by crustal and ancient CO_(2) uprising.

关键词： Qinghai-Tibet Plateau Hydro-chemistry indexes lake surface sediments lake reservoir effects

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