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Distribution and enrichment patterns of selenium in the Ediacaran and early Cambrian strata in the Yangtze Gorges area, South China

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Science China Earth Sciences 2017年第7期60卷 1268-1282页

作者： TIAN XingLei luo kunli Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences College of Resources and Environment University of the Chinese Academy of Sciences

The distribution and enrichment patterns of selenium(Se) in the E-?1 strata in the Yangtze Gorges area of South China were obtained. The geochemical characteristics of the significantly and non-significantly enriched strata of Se were *** observed enrichment factor(EF, relative to the upper continental crust) and concentration coefficient(CC, relative to the similar lithology in Eastern China) both suggest that Se is the most enriched/concentrated(SeEF=26.97, SeCC=48.04) among the analyzed23 trace elements the E-?1 strata. The normalized enrichment factor(EF′, EF after Al or Th normalized) shows Se is secondly enriched(SeEF′=218.73), which is slightly lower than cadmium(CdEF′=288.46) but significantly higher than the third enriched trace element arsenic(AsEF′=97.49). Se concentrations in the E-?1 strata vary from Yanjiahe(54.45)>Doushantuo(24.72)>Dengying(2.48)>Shipai(1.95)>lower Tianheban(1.24)Formations. Se concentrations in the E-?1 strata are best displayed on natural logarithm normal quantile-quantile(Q-Q) plots and shown as a positive-skewed distribution pattern. The Se significantly enriched(EF>10) strata sequences mainly include the lower and upper Doushantuo member II(DST-II), top DST-III, DST-IV, the basal and upper Yanjiahe Formation, and lower and upper Shuijingtuo Formation. Geochemical characteristics indicate that Se concentrations in the significantly enriched strata were generally influenced by terrigenous detrital as well as the combined action of single or multiple factors, such as hydrotherm,volcanic debris and deep source. Moreover, pyrite and organic matter promoted the enrichment of Se in the upper DST-II, DST-IV,upper Shuijingtuo Formation and lower DST-II, upper Shuijingtuo Formation, respectively. The Se concentrations in the n

关键词： Ediacaran-early Cambrian Selenium Distribution and enrichment patterns Elemental geochemistry

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Environmental behaviors of selenium in soil of typical selenosis area,China

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Journal of Environmental Sciences 2008年第7期20卷 859-864页

作者： LI Yonghua WANG Wuyi luo kunli Institute of Geographical Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China

Daba Mountain area is one of the two endemic selenosis areas in China,which may relate with the environmental behaviors of selenium (Se) in *** study focuses on the concentraion and distribution of Se and its relationships with some other elements in natural soil in the *** average concentration of Se in Daba Mountain soils was 14.3 times higher than the value cited for natural soil background worldwide,suggesting that soils in the region were contaminated by the *** finding was confirmed...

关键词： selenium (Se) selenosis area geoaccumulation index soil profile

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Discovery of anomalous gallium enriched in stone coal: Significance, provenance and recommendations

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Geoscience Frontiers 2023年第4期14卷 1-20页

作者： Jie Long Shixi Zhang kunli luo Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China School of Geosciences and Surveying Engineering China University of Mining and Technology(Beijing)Beijing 100083China

Gallium(Ga)is a critical mineral that plays an irreplaceable role in consumer electronics,clean energy technologies and the aerospace *** competition for gallium resources at the national strategic level has begun to emerge,but gallium resources are unevenly distributed globally,and their presence is not *** discoveries revealed an average gallium concentration of thirty-one samples from M_(1),M_(2),M_(3) and M_(4) stone coal-bearing seams of the Cambrian strata on South Qinling Orogenic Belt in central China is 157 mg/kg(9.98–747 mg/kg),which is 27.6-fold higher than the global hard coal average,as well as the existing association of Mo–V–U–Cd–Zn–Ba–Se–Mg–Ni–Cu *** average of these coal seams are 344 mg/kg(M_(3),44.5–747 mg/kg,n=11),270 mg/kg(M_(4),14.3–270 mg/kg,n=5),53.8 mg/kg(M_(2),22.6–75.4 mg/kg,n=8)and 19.8 mg/kg(M_(1),9.98–34.9 mg/kg,n=7)respectively,as well as the thickness of approximately 6,12,8,and 20 m,which be close to or exceed to the boundary grade standard(30 mg/kg)and minimum recoverable thickness(0.7 m)of gal-lium resources *** findings indicate that the Cambrian stone coal deposits,especially in the middle and late Cambrian period,should be considered as promising alternative sources of *** anomalous gallium-enriched sediments originated from a complex combination of hydrothermal flu-ids,original biomass and terrigenous *** the M_(1) stone coal-bearing seams,gallium most likely occurred in the mode of GaAs,Ga_(x)In_(1-x)As and GaO(OH),while modes of gallium in the M_(2) to M_(4) seams is interrelated with the organic affinity and clay *** crude reserve estimate of gallium resources in central China is approximately 10.06?104 tons,corresponding to a super-large coal-hosted gallium ore *** unique paleogeographic location and geological structure in central China resulted that this newly discovered deposit is a unique type of gallium-enriched deposit that has been di

关键词： Critical minerals Black rock series Modes of occurrence Gallium demand Deep-large fault

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Distribution of selenium and arsenic in differentiated multicellular eukaryotic fossils and their significance

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Geoscience Frontiers 2020年第3期11卷 821-833页

作者： Jie Long Shixi Zhang kunli luo Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

We present variation patterns of trace elements within different sequences of the Ediacaran Doushantuo Formation(DST,635-551 million years ago),and inside the cells of the earliest differentiated multicellular eukaryotic fossils of the Weng'an biota in the Weng'an County of Guizhou *** results showed that selenium is the most enriched and significantly varied trace element among the 22 trace elements throughout the DST,followed by *** highest selenium and arsenic content sequences are consistent with the first appeared sequence of the earliest differentiated multicellular eukaryotic fossils Megasphaera at the middle to upper parts of the *** secondary ion mass spectrometry analyses show that selenium and arsenic have an inhomogeneous and punctate distribution in the nucleus and *** nucleus has anomalously enriched levels of selenium and arsenic among the *** selenium and arsenic concentrations exhibit a positive correlation with the diversity of fossilized *** new findings give us a clue that the anomalous enrichment of selenium and arsenic might contributes to the cell differentiation in Ediacaran Doushantuo period.

关键词： Trace elements enrichment Weng'an biota Ediacaran Megasphaera Cell differentiation

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The Trace Element Distribution Patterns of Ediacaran-Early Cambrian Black Shales and the Origin of Selenium in the Guangning Area, Western Guangdong Province, South China

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Acta Geologica Sinica(English Edition) 2017年第6期91卷 1978-1991页

作者： TIAN Xinglei luo kunli Andrew V.ZUZA Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences University of the Chinese Academy of Sciences Nevada Bureau of Mines and Geology University of Nevada

The Ediacaran and early Cambrian black shales are widespread across the South China Craton （Yangtze and Cathaysia blocks）. However, the trace element distribution patterns of the Ediacaran and early Cambrian black shales in the Cathaysia Block are still unclear. In this study, thirty- four black shale samples in the Lechangxia Group （Ediacaran） and thirteen black shale samples in the lower Bacun Group （early Cambrian） from Guangning area, western Guangdong Province, South China, were analyzed for major and trace elements concentrations. Compared to the upper continental crust, the Ediacaran black shales exhibit strongly enriched Se, Ga, and As with enrichment factor values （EF） higher than 10, significantly enrichedBi and Rb （10〉EF〉5）, weakly enriched Mo, Ba, Cs, V, In, Be, TI, and Th （5〉EF〉2）, normal U, Cr, Cd, Sc, Pb, Cu, and Li （2〉EF〉0.5）, and depleted Ni, Zn, Sr, and Co. Early Cambrian black shales display strongly enriched Se, Ga, and As, significantly enriched Ba, Bi, and Rb, weakly enriched Mo, Cs, Cd, V, U, Be, In, and TI, normal Sc, Th, Cr, Li, Cu, Ni, and Pb and depleted Co, Zn, and Sr. Moreover, Se is the most enriched trace element in the Ediacaran and early Cambrian black shales： concentrations vary from 0.25 to 30.09 ppm and 0.54 to 5.01 ppm, and averaging 4.84 and 1.72 ppm, with average EF values of 96.87 and 34.32, for the Ediacaran and early Cambrian shales respectively. The average concentration of Se in the Ediacaran black shales is 2.8 times higher than that of early Cambrian black shales. Se contents in the Ediacaran and early Cambrian black shales exhibit significant variation （P = 0.03）. Provenance analysis showed that Se contents of both the Ediacaran and early Cambrian black shales were without detrital provenance and volcanoclastic sources, hut of hydrothermal origin. The deep sources of Se and the presence of pyrite may explain the higher Se contents in the Ediacaran black shales. Similar with the Se-rich characteristics of the contemporan

关键词： black shale selenium Ediacaran and early Cambrian Guangning area Cathaysia block

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Arsenic Distribution Pattern in Different Sources of Drinking Water and their Geological Background in Guanzhong Basin, Shaanxi, China

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Acta Geologica Sinica(English Edition) 2014年第3期88卷 984-994页

作者： luo kunli ZHANG Shixi TIAN Yuan GAO Xing Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Department of Chemistry School of ScienceTsinghua University

To study arsenic （As） content and distribution patterns as well as the genesis of different kinds of water,especially the different sources of drinking water in Guanzhong Basin,Shaanxi province,China,139 water samples were collected at 62 sampling points from wells of different depths,from hot springs,and *** As content of these samples was measured by the intermittent flowhydride generation atomic fluorescence spectrometry method （HG-AFS）.The As concentrations in the drinking water in Guanzhong Basin vary greatly （0.00-68.08 tg/L）,and the As concentration of groundwater in southern Guanzhong Basin is different from that in the northern Guanzhong *** within the same location in southern Guanzhong Basin,the As concentrations at different depths vary *** concentration of groundwater from the shallow wells （〈50 m deep,0.56-3.87 μg/L） is much lower than from deep wells （110-360 m deep,19.34-62.91 μg/L）,whereas As concentration in water of any depth in northern Guanzhong Basin is 〈10 μg/*** Guanzhong Basin is a newly discovered high-As groundwater area in *** high-As groundwater is mainly distributed in areas between the Qinling Mountains and Weihe River; it has only been found at depths ranging from 110 to 360 m in confined aquifers,which store water in the Lishi and Wucheng Loess （Lower and Middle Pleistocene） in the southern Guanzhong *** concentration of hot spring water is 6.47-11.94 μg/L; that of geothermal water between 1000 and 1500 m deep is 43.68-68.08 μg/*** high-As well water at depths from 110 to 360 m in southern Guanzhong Basin has a very low fluorine （F） value,which is generally 〈0.10 mg/***,the hot springs of Lintong and Tangyu and the geothermal water in southern Guanzhong Basin have very high F values （8.07-14.96 mg/L）.The results indicate that high As groundwater in depths from 110 to 360 m is unlikely to have a direct relationship with the geothermal water in the same *** concentration of all reser

关键词： Hydrology pollution water chemistry drinking water quality different groundwaterdepths arsenic content Pleistocene Loess Guanzhong Basin

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Fluorine emission from combustion of steam coal of North China Plate and Northwest China

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Chinese Science Bulletin 2002年第16期47卷 1346-1350页

作者： luo kunli XU Lirong LI Ribang XIANG Lianhua Institute of Geographical Sciences and Natural Resource Chinese Academy of SciencesBeijing 100101China Xi’an University of Science and Technology Xi’an 710054China

To study the amount of fluorine emission from the combustion of the steam coal (mainly Permo-Carbonif-erous coal) from the North China Plate and Northwest China, the fluorine contents of the coal, the fly ash and the cinder in high-temperature power stations as well as mid-low temperature power stations have been analyzed. This note provides a rough estimate of the total annual amount of fluorine emission as well as emission ratio from steam coal combustion in China. Our results show that by combustion of 1 t of Permo-Carboniferous coal (containing roughly 100 g fluorine), high-temperature power stations emit roughly 90 g fluorine into the atmosphere. The fluorine emission ratio of coal combustion in high-temperature power stations is about 96% and that in mid-low temperature power stations is about 78%. A total of 800 million tons of coal is burnt in China every year, and the coal comes mainly from Permo-Carboniferous deposite in the North China Plate and Northwest China coal mines. Taking the average

关键词： coal fluorine annual emission.

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Hydrochemical characteristics and element contents of natural waters in Tibet, China

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Journal of Geographical Sciences 2015年第6期25卷 669-686页

作者： TIAN Yuan YU Chengqun luo kunli ZHA Xinjie WU Jianshuang ZHANG Xianzhou NI Runxiang Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China Xi'an University of Science and Technology Xi'an 710054 China

Sixty water samples （35 groundwater samples, 22 surface water samples and three hot-spring water samples） were collected at 36 points from villages and towns in Lhasa city, Nagchu （Nagqu） prefecture, Ali （Ngari） prefecture and Shigatse （Xigaze） prefecture （Tibet） in 2013 to study the hydrochemical characteristics and element contents of natural waters. The concentrations of elements were determined in the water samples and compared with the concentrations in water samples from other regions, such as southeast Qinghai, south Xinjiang, east Sichuan and west Tibet. The hydrochemical species in different areas were also studied. Water in most parts of Tibet reaches the requirements of the Chinese national standard and the World Health Organization international standard. The pH values of the water samples ranged from 6.75 to 8.21 and the value for the mean total dissolved solids was 225.54 mg/L. The concentration of arsenic in water from Ali prefecture exceeded the limit of both the Chinese national standard and the international standard and the concentration of fluoride in water from Shuanghu exceeded the limit of both the Chinese national standard and the international standard. The main hydrochemical species in water of Tibet is Ca （HCO3）2. From south to north, the main cation in water changes from Ca^2＋ to Na^＋, whereas the main anions in water change from HCO3^- to Cl^- and SO4^2-. The chemistry of river water and melt water from ice and snow is dominated by the rocks present at their source, whereas the chemistry of groundwater is affected by many factors. Tectonic divisions determine the con- centrations of the main elements in water and also affect the hydrochemical species present.

关键词： element concentrations hydrochemical species water chemistry water quality Tibet

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重庆市江津区表层土壤中稀土元素含量与分布特征

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中国稀土学报 2020年第2期38卷 215-224页

作者：刘永林雒昆利袁余洋重庆师范大学地理与旅游学院重庆师范大学GIS应用研究重点实验室重庆401331 中国科学院地理科学与资源研究所北京100101 遵义师范学院工学院贵州遵义563006

为研究重庆市江津区表层土壤中稀土元素(REE)含量和空间分布特征,采集156件土壤样品,用电感耦合等离子体质谱仪(ICP-MS)测定其稀土元素含量。采用统计学和地质统计学分析了表层土壤中稀土元素含量和空间分布特征,结果表明:江津区表层土... 详细信息

为研究重庆市江津区表层土壤中稀土元素(REE)含量和空间分布特征,采集156件土壤样品,用电感耦合等离子体质谱仪(ICP-MS)测定其稀土元素含量。采用统计学和地质统计学分析了表层土壤中稀土元素含量和空间分布特征,结果表明:江津区表层土壤中REE含量范围为99.06~222.28μg·g^-1,平均值149.07μg·g^-1,低于中国土壤REE背景值(163.86μg·g-1)。江津区表层土壤的球粒陨石标准化曲线呈现向右倾斜的轻稀土富集型。δEu和δCe平均值分别为0.57和0.91,表现出明显的Eu负异常和微弱的Ce负异常。不同地质时代地层上覆表层土壤中REE含量具有显著差异性(p=0.035<0.05),下白垩统窝头山组(K1w)和侏罗系(J)地层上覆表层土壤中稀土元素含量高于三叠系(T)地层。江津区中西部地区表层土壤中稀土元素总量较高。

关键词：稀土元素表层土壤重庆市江津区空间分布

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陕西省典型高硒土壤的空间分布及主要农作物硒的含量特征和主要来源研究

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环境科学研究 2023年第5期36卷 1032-1041页

作者：郝栗涛张湜溪雒昆利中国科学院地理科学与资源研究所北京100101 中国富硒产业研究院陕西安康725000 吉林大学新能源与环境学院吉林长春130012 中国矿业大学(北京)地球科学与测绘工程学院北京100083

为研究陕西省安康市富硒核心区—岚皋县高硒土壤的空间分布及主要农作物硒含量特征和主要来源,本文在岚皋县采集了767个表层土壤样品,其中在高硒区(佐龙镇和民主镇)按行政村地块为单元,共加密采集了409个土样以及18个土豆、35个玉米和1... 详细信息

为研究陕西省安康市富硒核心区—岚皋县高硒土壤的空间分布及主要农作物硒含量特征和主要来源,本文在岚皋县采集了767个表层土壤样品,其中在高硒区(佐龙镇和民主镇)按行政村地块为单元,共加密采集了409个土样以及18个土豆、35个玉米和14个基岩样品,测试了其总硒含量.结果表明:(1)岚皋县北部典型高硒区—佐龙镇和民主镇的土壤硒含量平均值分别为3.38 mg/kg(范围为0.02~37.39 mg/kg)和3.11 mg/kg(范围为0.05~16.96 mg/kg),均远高于中国(0.29 mg/kg)和全球(0.40mg/kg)表层土壤硒含量的背景值.(2)佐龙镇和民主镇表层土壤硒含量大于0.40 mg/kg的面积分别占各自乡镇面积的99.18%和75.79%.(3)佐龙镇中部地区的硒含量较高,民主镇中部和东南部地区的硒含量较高.高硒区的土豆(硒含量范围为0.04~1.78 mg/kg,平均值为0.49 mg/kg)和玉米(硒含量范围为0.01~2.82 mg/kg,平均值为0.69 mg/kg)的富硒率均超过68%.(4)高硒区土壤富硒的最主要原因是晚前寒武纪—寒武纪的富硒地层大面积出露,导致风化形成的上覆土壤硒含量相应较高.(5)高硒区主要农作物硒含量与分布区的基岩硒含量密切相关.研究显示,岚皋县北部表层土壤和农作物的硒含量均主要来源于分布区的富硒地层.

关键词：岚皋县高硒区表层土壤空间分布农作物硒含量

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