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Source analysis and risk evaluation of heavy metal in the river sediment of polymetallic mining area:Taking the Tonglüshan skarn type Cu-Fe-Au deposit as an example,Hubei section of the Yangtze River Basin,{1.

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china Geology 2022年第4期5卷 649-661页

作者： Jing Wang Xin-xin zhang Ai-{1. Chen Bo Wang {2.-bin Zhao Guan-nan liu xiao xiao Jin-nan Cao chinese Academy of {1. {2. China Geology SurveyMinistry of Natural ResourcesBeijing 100037China Key Laboratory of Strategic mineral {1. of the Upper Yellow River Ministry of Natural ResourcesLanzhou 730046China chinese Academy of Natural {1. Economics Beijing 101149China Key Laboratory for mineralization and Resource Evaluation of Ministry of Natural {1. Institute of Mineral Resources of Chinese Academy of Geological SciencesBeijing 100037China

In this paper,2. samp{1.ng points of overlying deposits in Tonglushan mining area,Daye City,Hubei Province,china were tested for heavy metal content to explore pollution characteristics,pollution sources and ecological risks of heavy metals in sediments.A geo-accumulation index method was used to evaluate the degree of heavy metal pollution in the *** mean sediment qua{1.ty guide{1.ne quotient was used for evaluating the ecological risk level of heavy metal in the *** a method of correlation analysis,clustering analysis,and principal component analysis was used for pre{1.minary analysis on the source of heavy metal in the *** was indicated that there was extremely heavy metal pollution in the sediment,among which Cd was extremely polluted,Cu strongly contaminated,Zn,As,and Hg moderately contaminated,and Pb,Cr,and Ni were s{1.ghtly *** was also indicated by the mean sediment qua{1.ty guide{1.ne-quotient result that there was a high ecological risk of heavy metals in the sediment,and 64%of the sample sites had extremely high hidden biotoxic *** distribution,the contamination of branches was worse than that of the main channel of Daye Dagang,and the deposition of each heavy metal was mainly influenced by the distance from this sample site to the sewage draining exit of a tai{1.ngs *** source analysis showed that the heavy metals in the sediment come from pollution discharging of mining and beneficiation companies,tai{1.ngs ponds,smelting companies,and transport *** the study area,due to the influence of heavy metal discharging from these sources,the ecotoxicity of heavy metals in the sediment was extremely high,and Cd was the most toxic *** research figured out the key restoration area and elements for ecological restoration in the sediment of the Tonglüshan mining area,which could be referenced by monitoring and governance of heavy metal pollution in the sediment of the polymetal{1.c mining area.

关键词： Sediment Heavy metal pollution Ecological risks Geo-accumulation index method Sediment quality guideline-quotient Cluster analysis Principal component analysis Skarn-type Ecological environment survey Tonglüshan Daye Lake china

geological characteristics,metallogenic regularity,and research progress of {1.thium deposits in{2.

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china Geology 2022年第4期5卷 734-767页

作者： Bo zhang Fan-yu {1. Xue-zheng Gao {2.-lei li Yun-tao Shang Zhao-yu Kong li-{1.ong Jia JieMeng Hui Guo Fu-kang fang Yan-bin liu {2. Jiang Hui Chai Zi liu Xian-tao Ye Guo-dong Wang Development and Research Center China Geological SurveyMinistry of Natural ResourcesBeijing 100037China School of Earth sciences and {1. China University of GeosciencesBeijing 100083China china Coal Geology Group Company {1.mited Beijing 100040China china Aero Geophysical Survey and Remote Sensing Center for Natural {1. Beijing 100083China china National {1. Exploration Center of Building Materials Industry Beijing 100035China Beijing institute of Geology for {1. {2. Company limited Beijing 100012China College of Oceanography Hohai UniversityNanjing 210098China School of resources and Environment Linyi UniversityLinyi 276005China

china is rich in abundant {1.thium {2. characterized by considerable reserves and a concentrated distribution of metallogenic zones or belts,with proven reserves of 4046.8×1.^(3) t(calculated based on {1._(2.O)by... 详细信息

china is rich in abundant lithium {2. characterized by considerable reserves and a concentrated distribution of metallogenic zones or belts,with proven reserves of 4046.8×10^(3) t(calculated based on li_(2.O)by *** is also a big consumer of *** 2.19,china’s lithium consumption in the battery sector alone had reached 99×10^(3) t,with an average annual growth rate of nearly 2.%.china has become the world’s largest importer of lithium {2.,showing a severely unbalanced relationship between supply and demand for lithium ***,there is an urgent need for the prospecting,exploitation,and study of lithium {2. in *** study collected,organized,and summarized the data on the major lithium deposits in china,analyzed and compared the spatial-temporal distribution patterns,geological characteristics,and metallogenic regularity of these lithium deposits,and summarized the prospecting and research achievements over the last *** major lithium deposits in china are distributed in provinces and regions such as qinghai,Jiangxi,Sichuan,Tibet,and *** deposits are mostly small in *** to different genetic types,this study divided lithium deposits into granitic pegmatite type,granite type,saline lake brine type,underground brine type,and sedimentary type,as well as new types including hot spring type and magmatic-hydrothermal type,and summarized the characteristics and key metallogenic factors of these different types of *** metallogenic prospect areas of lithium deposits were delineated according to the deposit types and the distribution patterns of metallogenic *** paper introduced the research progress in major metallogenic models and lithium extraction techniques made over the past *** on the comprehensive analysis of the prospecting potential of lithium deposits,the authors concluded that the future prospecting of lithium {2. in china should focus on lithium metallogenic

关键词： lithium deposit Deposit type Metallogenic age Metallogenic regularity Metallogenic belt mineral exploration china

偏振X射线荧光分析尾矿薄层样品的散射校正方法研究

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光谱学与光谱分析 2023年第1期43卷 169-174页

作者：贾文宝李俊张新磊杨晓艳邵金发陈齐炎单卿凌永生黑大千南京航空航天大学材料科学与技术学院核科学与技术系江苏南京211106 内蒙古自治区计量测试研究院内蒙古呼和浩特010030 北京师范大学核科学与技术学院射线束技术教育部重点实验室北京100875 兰州大学核科学与技术学院甘肃兰州730000

了解尾矿浆中的重金属元素含量能为矿物浮选提供决策依据,不仅可以提高矿物的利用率,还可减少环境污染。X射线荧光光谱法是一种常用的重金属元素分析技术,对于地质类样品的分析,康普顿散射内标法是一种常用的定量方法。但对于薄层沉积样... 详细信息

了解尾矿浆中的重金属元素含量能为矿物浮选提供决策依据,不仅可以提高矿物的利用率,还可减少环境污染。X射线荧光光谱法是一种常用的重金属元素分析技术,对于地质类样品的分析,康普顿散射内标法是一种常用的定量方法。但对于薄层沉积样品,其康普顿散射峰强度会受到支撑滤膜的散射影响。由于样品紧密附着在支撑滤膜上,难以直接获得来自样品本身的康普顿散射强度,不利于直接应用康普顿散射峰强度进行定量分析。以尾矿薄层样品为分析对象,研究了不同聚丙烯滤膜厚度对康普顿散射峰强度的影响,并对薄层样品的康普顿散射强度进行了校正。实验结果表明,在0.34~3.06 mm厚度范围内,康普顿散射峰强度随聚丙烯滤膜厚度的增加线性增加,通过建立探测器获得的总康普顿散射强度与滤膜厚度的线性关系,计算出样品的净康普顿散射峰强度。为验证该修正方法的可靠性,利用蒙特卡洛方法模拟研究了无滤膜的尾矿样品和带有不同厚度滤膜的尾矿样品,结果显示经滤膜厚度影响修正后的净康普顿散射峰强度与无滤膜样品康普顿散射峰强度基本一致,相对偏差为0.41.。同时通过实验和模拟计算了0.34 mm厚聚丙烯滤膜时修正后的净康普顿散射峰强度占总康普顿散射峰的比例,分别为91.31.和89.91.,二者基本一致。最后,利用了上述基于滤膜厚度康普顿散射影响的校正方法,建立了基于康普顿散射内标法的定量校准曲线,对两种尾矿浆中的Cu,Zn和Pb元素的定量分析结果显示,未经滤膜厚度修正的康普顿内标校正相比校正前,部分元素定量结果与ICP-OES结果相比,其相对偏差反而增加3.1.%~9.00%。而经滤膜厚度修正的康普顿内标方法的定量结果与ICP-OES结果的相对误差在1.1.%~1..1.%之间,相比于校正之前,相对偏差减少了0.30%~8.97%。

关键词：偏振X射线荧光光谱分析尾矿浆康普顿散射定量方法

干旱区典型湖泊CH_(4)扩散排放特征及其影响因素

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环境科学学报 2022年第10期42卷 462-472页

作者：廖远珊肖启涛齐天赐张建平姚建斌李均力段洪涛西北大学城市与环境学院西安710127 中国科学院南京地理与湖泊研究所中国科学院流域地理学重点实验室南京210008 巴州博斯腾湖科学研究所库尔勒841000 新疆地矿局第三地质大队巴州新矿测绘有限责任公司库尔勒841000 中国科学院新疆生态与地理研究所乌鲁木齐830011

湖泊等水体CH_(4)的排放是全球温室气体的主要组成部分,但目前对干旱区湖泊CH_(4)扩散排放特征及其影响因素的研究却鲜有报道.本文选取干旱区典型湖泊—博斯腾湖为研究对象,分别于2.2.年6月、9月、1.月采集水样,并测定其生物地球化学参... 详细信息

湖泊等水体CH_(4)的排放是全球温室气体的主要组成部分,但目前对干旱区湖泊CH_(4)扩散排放特征及其影响因素的研究却鲜有报道.本文选取干旱区典型湖泊—博斯腾湖为研究对象,分别于2.2.年6月、9月、1.月采集水样,并测定其生物地球化学参数及溶解CH_(4)浓度,确定其水-气界面CH_(4)扩散排放通量.结果表明,博斯腾湖CH_(4)扩散通量均值为(0.305±0.080)mmol·m^(-2.·d^(-1.,表现为大气CH_(4)的排放源;在空间上,受外源输送影响,入湖河口为CH_(4)的扩散排放热点区域;在不同月份,CH_(4)扩散通量变化受营养状态影响显著,与综合富营养化指数、叶绿素a浓度等呈显著正相关(富营养化指数:r=0.67,p1.叶绿素a:r=0.54,p1.,但其对温度的依赖性较低(p>0.05).另外,受外源输送、水动力特征、内部生物化学过程等影响,博斯腾湖CH_(4)扩散通量在不同湖区的控制因子表现出较大差异,其具体控制机制还需进一步明晰.

关键词：干旱湖泊博斯腾湖甲烷扩散通量时空变化影响因素

Feasibility and physics potential of detecting ^(8)B solar neutrinos at JUNO

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chinese Physics C 2021年第2期45卷 93-110页

作者： Angel Abusleme Thomas Adam Shakeel Ahmad Sebastiano Aiello Muhammad Akram Nawab Ali Fengpeng An Guangpeng An {1. An Giuseppe Andronico Nikolay Anfimov Vito Antonelli Tatiana Antoshkina Burin Asavapibhop João Pedro Athayde Marcondes de André Didier Auguste Andrej Babic Wander Baldini Andrea Barresi Eric Baussan Marco Bellato Antonio Bergnoli Enrico Bernieri David Biare Thilo Birkenfeld Sylvie Blin David Blum Simon Blyth Anastasia Bolshakova Mathieu Bongrand Clément Bordereau Dominique Breton Augusto Brigatti Riccardo Brugnera Riccardo Bruno Antonio Budano Max Buesken Mario Buscemi Jose Busto Ilya Butorov Anatael Cabrera Hao Cai xiao Cai Yanke Cai Zhiyan Cai Antonio Cammi Agustin Campeny Chuanya Cao Guofu Cao Jun Cao Rossella Caruso Cédric Cerna Jinfan Chang Yun Chang Pingping Chen Po-An Chen Shaomin Chen Shenjian Chen Xurong Chen Yi-Wen Chen Yixue Chen Yu Chen zhang Chen Jie Cheng Yaping Cheng Alexander Chepurnov Davide Chiesa Pietro Chimenti Artem Chukanov Anna Chuvashova Gérard Claverie Catia Clementi Barbara Clerbaux Selma Conforti Di Lorenzo Daniele Corti Salvatore Costa Flavio Dal Corso Christophe De La Taille Jiawei Deng Zhi Deng Ziyan Deng Wilfried Depnering Marco Diaz Xuefeng Ding Yayun Ding Bayu Dirgantara Sergey Dmitrievsky Tadeas Dohnal Georgy Donchenko Jianmeng Dong Damien Dornic Evgeny Doroshkevich Marcos Dracos Frédéric Druillole Shuxian Du Stefano Dusini Martin Dvorak Timo Enqvist Heike Enzmann Andrea Fabbri Lukas Fajt Donghua Fan Lei Fan Can fang Jian fang Marco Fargetta Anna Fatkina Dmitry Fedoseev Vladko Fekete li-Cheng Feng {1.chun Feng Richard Ford Andrey Formozov Amélie Fournier Haonan Gan Feng Gao Alberto Garfagnini Alexandre Göttel Christoph Genster Marco Giammarchi Agnese Giaz Nunzio Giudice Franco Giuliani Maxim Gonchar Guanghua Gong Hui Gong Oleg Gorchakov Yuri Gornushkin Marco Grassi Christian Grewing Maxim Gromov Vasily Gromov Minghao Gu xiaofei Gu Yu Gu Mengyun Guan Nunzio Guardone Maria Gul Cong Guo Jingyuan Guo Wanlei Guo Xinheng Guo Yuhang Guo Paul Hackspacher Caren Hagner Ran Han Yan Yerevan Physics institute YerevanArmenia Universitélibre de Bruxelles BrusselsBelgium Universidade Estadual de Londrina LondrinaBrazil Pontificia Universidade Catolica do Rio de Janeiro RioBrazil Pontificia Universidad Católica de Chile SantiagoChile Universidad Tecnica Federico Santa Maria ValparaisoChile Beijing institute of Spacecraft Environment Engineering BeijingChina Beijing Normal University BeijingChina china {1. of Atomic Energy BeijingChina institute of High Energy Physics BeijingChina North china Electric Power University BeijingChina School of Physics Peking UniversityBeijingChina Tsinghua University BeijingChina University of chinese Academy of {1. BeijingChina Jilin University ChangchunChina College of Electronic Science and Engineering National University of Defense TechnologyChangshaChina Chongqing University ChongqingChina Dongguan University of Technology DongguanChina Jinan University GuangzhouChina Sun Yat-Sen University GuangzhouChina Harbin institute of Technology HarbinChina University of Science and Technology of china HefeiChina The Radiochemistry and Nuclear Chemistry Group in University of South china HengyangChina Wuyi University JiangmenChina Shandong University JinanChina institute of Modern Physics Chinese Academy of SciencesLanzhouChina nanjing University NanjingChina Guangxi University NanningChina East china University of Science and Technology ShanghaiChina School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghaiChina Tsung-Dao Lee institute Shanghai Jiao Tong UniversityShanghaiChina institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuangChina Nankai University TianjinChina Wuhan University WuhanChina Xi’an Jiaotong University Xi’anChina Xiamen University XiamenChina School of Physics and Microelectronics Zhengzhou UniversityZhengzhouChina institute of Physics National Chiao-Tung University Hsinchu National United University Miao-Li Department of Physics National T

The Jiangmen Underground Neutrino Observatory(JUNO)features a 2. kt multi-purpose underground {1.quid scintillator sphere as its main *** of JUNO's features make it an excellent location for^8B solar neutrino measurements,such as its low-energy threshold,high energy resolution compared with water Cherenkov detectors,and much larger target mass compared with previous {1.quid scintillator *** this paper,we present a comprehensive assessment of JUNO's potential for detecting^8B solar neutrinos via the neutrino-electron elastic scattering process.A reduced 2.MeV threshold for the recoil electron energy is found to be achievable,assuming that the intrinsic radioactive background^(2.8)U and^(2.2.Th in the {1.quid scintillator can be controlled to 1.^(-1.)g/*** ten years of data acquisition,approximately 60,000 signal and 30,000 background events are *** large sample will enable an examination of the distortion of the recoil electron spectrum that is dominated by the neutrino flavor transformation in the dense solar matter,which will shed new {1.ght on the inconsistency between the measured electron spectra and the predictions of the standard three-flavor neutrino oscillation *** m^(2._(2.)=4.8times1.^(-5);(7.5times1.^(-5))eV^(2.,JUNO can provide evidence of neutrino oscillation in the Earth at approximately the 3sigma(2.igma)level by measuring the non-zero signal rate variation with respect to the solar zenith ***,JUNO can simultaneously measureDelta m^2.(2.)using^8B solar neutrinos to a precision of 2.% or better,depending on the central value,and to sub-percent precision using reactor antineutrinos.A comparison of these two measurements from the same detector will help understand the current mild inconsistency between the value of Delta m^2.(2.)reported by solar neutrino experiments and the KamLAND experiment.

关键词： neutrino oscillation solar neutrino JUNO

Sub-percent precision measurement of neutrino oscillation parameters with JUNO

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chinese Physics C 2022年第12期46卷 28-49页

作者： Angel Abusleme Thomas Adam Shakeel Ahmad Rizwan Ahmed Sebastiano Aiello Muhammad Akram Abid Aleem Fengpeng An qi An Giuseppe Andronico Nikolay Anfimov Vito Antonel{1. Tatiana Antoshkina Burin Asavapibhop João Pedro Athayde Marcondes de André Didier Auguste Weidong Bai Nikita Balashov Wander Baldini Andrea Barresi Davide Basi{1.co Eric Baussan Marco Bellato Antonio Bergno{1. Thilo Birkenfeld Sylvie B{1.n David Blum Simon Blyth Anastasia Bolshakova Mathieu Bongrand Clément Bordereau Dominique Breton Augusto Brigatti Riccardo Brugnera Riccardo Bruno Antonio Budano Jose Busto Ilya Butorov Anatael Cabrera Barbara Caccianiga Hao Cai xiao Cai Yanke Cai Zhiyan Cai Riccardo Callegari Antonio Cammi Agustin Campeny Chuanya Cao Guofu Cao Jun Cao Rossella Caruso Cédric Cerna Chi Chan Jinfan Chang Yun Chang Guoming Chen Pingping Chen Po-An Chen Shaomin Chen Xurong Chen Yixue Chen Yu Chen Zhiyuan Chen Zikang Chen Jie Cheng Yaping Cheng Yu Chin Cheng Alexey Chetverikov Davide Chiesa Pietro Chimenti Artem Chukanov Gérard Claverie Catia Clementi Barbara Clerbaux Selma Conforti Di Lorenzo Daniele Corti Flavio Dal Corso O{1.via Dalager Christophe De La Taille Zhi Deng Ziyan Deng Wilfried Depnering Marco Diaz Xuefeng Ding Yayun Ding Bayu Dirgantara Sergey Dmitrievsky Tadeas Dohnal Dmitry Dolzhikov Georgy Donchenko Jianmeng Dong Evgeny Doroshkevich Marcos Dracos Frédéric Druillole Ran Du Shuxian Du Stefano Dusini Martin Dvorak Timo Enqvist Heike Enzmann Andrea Fabbri Donghua Fan Lei Fan Jian fang Wenxing fang Marco Fargetta Dmitry Fedoseev Zhengyong Fei {1.-Cheng Feng qichun Feng Richard Ford Amé{1.e Fournier Haonan Gan Feng Gao Alberto Garfagnini Arsenii Gavrikov Marco Giammarchi Nunzio Giudice Maxim Gonchar Guanghua Gong Hui Gong Yuri Gornushkin Alexandre Göttel Marco Grassi Vasily Gromov Minghao Gu xiaofei Gu Yu Gu Mengyun Guan Yuduo Guan Nunzio Guardone Cong Guo Jingyuan Guo Wanlei Guo Xinheng Guo Yuhang Guo Paul Hackspacher Caren Hagner Ran Han Yang Han Miao He Wei He Tobias Heinz Patrick Hellmuth Yuekun Heng Rafael Herrera YuenKeung Ho Yerevan Physics institute YerevanArmenia Universiélibre de Bruxelles BrusselsBelgium Universidade Estadual de Londrina LondrinaBrazil Pontificia Universidade Catolica do Rio de Janeiro Rio de JaneiroBrazil Pontificia Universidad Católica de Chile SantiagoChile Universidad Tecnica Federico Santa Maria ValparaisoChile Beijing institute of Spacecraft Environment Engineering BeijingChina Beijing Normal University BeijingChina china {1. of Atomic Energy BeijingChina institute of High Energy Physics BeijingChina North china Electric Power University BeijingChina School of Physics Peking UniversityBeijingChina Tsinghua University BeijingChina University of chinese Academy of {1. BeijingChina Jilin University ChangchunChina College of Electronic Science and Engineering National University of Defense TechnologyChangshaChina Chongqing University ChongqingChina Dongguan University of Technology DongguanChina Jinan University GuangzhouChina Sun Yat-Sen University GuangzhouChina Harbin institute of Technology HarbinChina University of Science and Technology of china HefeiChina The Radiochemistry and Nuclear Chemistry Group in University of South china HengyangChina Wuyi University JiangmenChina Shandong University JinanChinaand Key Laboratory of Particle Physics and Particle Irradiation of Ministry of EducationShandong UniversityQingdaoChina institute of Modern Physics Chinese Academy of SciencesLanzhouChina nanjing University NanjingChina Guangxi University NanningChina East china University of Science and Technology ShanghaiChina School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghaiChina Tsung-Dao Lee institute Shanghai Jiao Tong UniversityShanghaiChina institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuangChina Nankai University TianjinChina Wuhan University WuhanChina Xi'an Jiaotong University Xi'anChina Xiamen University XiamenChina School of Physics and Microelectronics Zhengzhou UniversityZhengzhou

JUNO is a multi-purpose neutrino observatory under construction in the south of *** publication presents new sensitivity estimates for the measurement of the △m_(31.^({1.,△m_({1.)^({1.,sin^({1.θ_(1.1.,and sin^({1.θ_(1.) oscillation parameters using reactor antineutrinos,which is one of the primary physics goals of the *** sensitivities are obtained using the best knowledge available to date on the location and overburden of the experimental site,the nuclear reactors in the surrounding area and beyond,the detector response uncertainties,and the reactor antineutrino spectral shape constraints expected from the TAO satellite *** is found that the △m_({1.)^({1. and sin^({1.θ_(1.1. oscillation parameters will be determined to 0.5%precision or better in six years of data *** the same period,the △m_(31.^({1. parameter will be determined to about 0.{1.precision for each mass ordering *** new precision represents approximately an order of magnitude improvement over existing constraints for these three parameters.

关键词： neutrino oscillation reactor antineutrino precision measurement JUNO

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激发极化法在东溪金矿接替资源勘查中的应用

物探与化探 2017年第3期41卷 445-451页

作者：张晓东方捷张定源谢恩才凌其怀孙瑛冯海林南京地质调查中心江苏南京210016 安徽省霍山县金矿有限责任公司安徽六安237200 江苏省地质勘查技术院江苏南京210008

东溪金矿是北淮阳构造带东段最早被发现、最早被开采的金矿,因矿石缺乏硫化物,激电测量是否有效曾有争议。通过电阻率测量,辅以极化率测量,发现这些常用的物探技术在贫硫化物的东溪—南关岭金矿接替资源勘查中有效,视电阻率异常指示含... 详细信息

东溪金矿是北淮阳构造带东段最早被发现、最早被开采的金矿,因矿石缺乏硫化物,激电测量是否有效曾有争议。通过电阻率测量,辅以极化率测量,发现这些常用的物探技术在贫硫化物的东溪—南关岭金矿接替资源勘查中有效,视电阻率异常指示含金石英(碳酸盐)脉,视极化率异常可能暗示与成矿有关的脉岩及断裂构造。激电测量为探求控矿构造,尤其为实施钻探工程提供了强有力证据。

关键词：激电测深东溪金矿电阻率极化率接替资源勘查

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徐州地区辉绿岩地球化学特征

地质学刊 2018年第1期42卷 23-31页

作者：王善明张洁张琪周琦忠肖书阅李帅王大志施建斌江苏省地质勘查技术院江苏南京210008 南京地质调查中心江苏南京210016 江苏省地质矿产局第五地质大队江苏徐州221004 湖南省地质矿产勘查开发局四一三队湖南常德415000 江苏省地质矿产勘查局江苏南京210008

对徐州栏杆地区侵位于元古代地层中的辉绿岩进行了系统的地球化学研究。栏杆地区的辉绿岩属于板内玄武岩系列岩石,地球化学特征上略富集轻稀土元素(LREE),富集大离子亲石元素(liLE),略亏损高场强元素(HFSE),相对富集Cr和Ni;微量元素显示... 详细信息

对徐州栏杆地区侵位于元古代地层中的辉绿岩进行了系统的地球化学研究。栏杆地区的辉绿岩属于板内玄武岩系列岩石,地球化学特征上略富集轻稀土元素(LREE),富集大离子亲石元素(liLE),略亏损高场强元素(HFSE),相对富集Cr和Ni;微量元素显示了EM-OIB(富集地幔-洋岛玄武岩)的特征,辉绿岩稀土元素特征显示在岩浆上侵过程中经历了分离结晶作用。结合新元古代全球Rodinia超大陆裂解事件及其岩浆活动与地幔柱的密切关系,认为徐州地区新元古代辉绿岩可能为地幔柱作用在华北陆块边缘的记录。

关键词：辉绿岩地球化学江苏徐州

地质高背景地区土壤中铁锰结核形成机理——以广西桂中地区为例

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生态学杂志 2021年第8期40卷 2302-2314页

作者：季文兵杨忠芳尹爱经芦园园应蓉蓉杨琼刘旭李博段轶仁王珏王懿铮余涛吴天生张起钻生态环境部南京环境科学研究所南京210042 国家环境保护土壤管理与污染控制重点实验室南京210042 中国地质大学(北京)地球科学与资源学院北京100083 中国地质大学(北京)数理学院北京100083 广西壮族自治区地质调查院南宁530023 广西壮族自治区地质矿产勘查开发局南宁530023

地质高背景的岩溶区土壤中普遍发育铁锰结核,且含量远高于非岩溶地区。为了解岩溶区土壤中铁锰结核的成因,选择广西桂中地区土壤(0~2. cm)中的铁锰结核为研究对象,通过光学显微镜(OP)、场发射扫描电子显微镜(FESEM)及能谱分析(EDS),结... 详细信息

地质高背景的岩溶区土壤中普遍发育铁锰结核,且含量远高于非岩溶地区。为了解岩溶区土壤中铁锰结核的成因,选择广西桂中地区土壤(0~2. cm)中的铁锰结核为研究对象,通过光学显微镜(OP)、场发射扫描电子显微镜(FESEM)及能谱分析(EDS),结合岩溶区复杂的成土过程,对地质高背景地区土壤中铁锰结核的形成过程进行分析。结果表明:岩溶区土壤中普遍发育两种结核,分别是铁结核和锰结核,宏观上结核呈现次圆状至椭圆状,粒径范围主要为0.5~4.0 mm,且均发育有环带结构和无环带结构结核。锰结核主要是以铁氧化物和锰氧化物为主,而铁结核内部是以铁氧化物为主。据上述结果和岩溶成土过程,提出地质高背景土壤中铁锰结核发育的过程:1.岩溶地区土壤在成土过程中,铁锰等元素发生不同程度的"浓集"作用,为结核的形成提供了丰富的物质来源;2.特殊的季节性干湿交替气候条件导致铁元素和锰元素的交替性沉淀,促进典型环带结构的形成,而无环带结构则可能代表结核形成的早期阶段;3)结核内部的微孔隙结构可以为微生物活动提供空间和物质流动提供通道,特殊气候环境条件富含有机质和微生物可能会促进铁锰结核的形成,最终形成岩溶区土壤中普遍发育的铁锰结核。

关键词：铁结核锰结核成土过程交替性沉淀环带结构浓集作用