检索结果-南通市图书馆

青藏高原东北缘循化盆地中中新世—早上新世黏土矿物及其古气候意义

在线全文

学校读者我要写书评

暂无评论

地质学报 2024年第4期98卷 1291-1309页

作者：胡飞殷科姬凯鹏刘钊肖唐付黄蔚何翔骆满生张克信广州大学环境科学与工程学院广东广州510006 广东省地质调查院广东广州510000 中国地质大学地球科学学院湖北武汉430074 湖北省地质局水文地质工程地质大队湖北荆州434020 河北地质大学宝石与材料学院河北石家庄050031 中国地质大学生物地质与环境地质国家重点实验室湖北武汉430074 中国地质大学地质调查研究院湖北武汉430074

青藏高原东北缘古气候可能受控于全球变冷、青藏高原隆升及局地地形变化的影响。为解析气候演化过程及驱动因素,本文以青藏高原东北缘循化盆地西沟剖面作为研究对象,在已有古地磁年龄约束基础上,分析了中中新世—早上新世沉积物中黏土... 详细信息

青藏高原东北缘古气候可能受控于全球变冷、青藏高原隆升及局地地形变化的影响。为解析气候演化过程及驱动因素,本文以青藏高原东北缘循化盆地西沟剖面作为研究对象,在已有古地磁年龄约束基础上,分析了中中新世—早上新世沉积物中黏土矿物的组成和微观形貌特征。结果表明,西沟剖面沉积物中黏土矿物主要由伊利石、蒙脱石、绿泥石和高岭石组成,其中伊利石含量最高,平均为59.3%;蒙脱石次之,平均为18.2%,绿泥石平均含量为12.3%,高岭石平均含量为10.2%。根据剖面中黏土矿物含量和比值的变化特征,结合循化盆地西沟剖面的沉积速率、孢粉记录、有机质碳同位素和沉积岩地球化学比值,并与深海氧同位素值(δ^(18)O)变化曲线对比,将循化盆地14.6~5.0 Ma气候环境演化划分为3个阶段:14.6~12.7 Ma,气候干冷期,与北半球冰盖扩展引发的全球性降温事件有关;12.7~8.0 Ma,气候相对温暖湿润期,可能与循化盆地周围山体隆升有关,即积石山在~12.7 Ma隆升至临界高度,成为西风带输送水汽的地形屏障,使得循化盆地内的降水增强;8.0~5.0 Ma,气候再次转向干冷期,该阶段气候的干旱化对应于青藏高原在8 Ma左右的快速隆升,高原进一步的隆升阻碍东亚季风西风带的暖湿气流向内陆的输送,从而引起区域干旱化。

关键词：中中新世—早上新世黏土矿物循化盆地干旱化全球变冷青藏高原隆升

在线全文

学校读者我要写书评

暂无评论

典型铊矿区河流水化学与重金属时空变化特征

地球与环境 2024年第3期52卷 296-308页

作者：晏燕肖唐付宁增平刘恩光马良刘意章刘承帅广州大学环境科学与工程学院广州510006 中国科学院地球化学研究所环境地球化学国家重点实验室贵阳550081 中国科学院大学北京100049

采集了贵州省黔西南州滥木厂铊矿区清水河流域20个点位洪水期、平水期和枯水期水体样品,综合运用数理统计、Piper三线图、离子比和内梅罗污染指数法等方法,分析了清水河流域水体的水文地球化学特征,探讨了流域水化学空间演化规律,查明... 详细信息

采集了贵州省黔西南州滥木厂铊矿区清水河流域20个点位洪水期、平水期和枯水期水体样品,综合运用数理统计、Piper三线图、离子比和内梅罗污染指数法等方法,分析了清水河流域水体的水文地球化学特征,探讨了流域水化学空间演化规律,查明了Tl等重金属时空变化特征与污染现状。结果表明:清水河流域水体均为弱碱性,阳离子以Ca^(2+)和Mg^(2+)为主,阴离子以HCO_(3)^(-)和SO_(4)^(2-)为主,水化学类型为Ca·Mg-HCO_(3)·SO_(4)(SO_(4)·HCO_(3))型;主要离子浓度季节性变化与空间差异较小,水化学组分主要受碳酸盐岩风化和蒸发岩溶解控制;清水河水体Tl污染严重,Tl浓度季节性差异明显,洪水期和平水期相对稳定,而枯水期水体Tl含量受地下泉水和历史遗留废渣影响显著,波动较大,最高可达4.036μg/L,内梅罗污染指数法评估结果表明清水河水体Tl等重金属污染水平为重度污染;虽然矿山生态修复后,清水河水体水质有所改善,但Tl等重金属污染问题未根除,亟需查明流域地下水水质状况和科学整治河道内堆积的历史遗留废渣。

关键词：重金属水化学时空变化离子来源矿山修复

广东河源地区早白垩世径尾岩体的年代学和地球化学特征及其地质意义

在线全文

学校读者我要写书评

暂无评论

地质论评 2024年第5期70卷 1743-1766页

作者：胡飞何翔李锐叶升明胡昆黄蔚张克信肖唐付广州大学环境科学与工程学院广州510006 广东省地质调查院广州510000 中国地质大学地质调查研究院武汉430074

华南晚中生代花岗岩及其形成的构造背景是目前研究的热点之一。笔者等报道了分布于华南板块东南部河源地区径尾岩体的岩石学、地球化学和年代学特征,以探讨该岩体的形成时代、岩石成因及其构造环境。岩石学研究表明,径尾岩体岩性较为单... 详细信息

华南晚中生代花岗岩及其形成的构造背景是目前研究的热点之一。笔者等报道了分布于华南板块东南部河源地区径尾岩体的岩石学、地球化学和年代学特征,以探讨该岩体的形成时代、岩石成因及其构造环境。岩石学研究表明,径尾岩体岩性较为单一,主要为黑云母二长花岗岩。LA-ICP-MS锆石U-Pb定年结果显示,径尾黑云母二长花岗岩的年龄在143.2±1.3~145.4±1.1 Ma之间,表明其形成时代为早白垩世。岩石学及地球化学特征显示,径尾黑云母二长花岗岩属于准铝质—弱过铝质系列,具有富SiO_(2)(71.15%~76.11%),富K_(2)O(4.68%~5.89%),贫Al_(2)O_(3)(12.58%~14.03%)的特点,富集Rb、U、Th等大离子亲石元素,亏损P、Ti、Ba、Sr等元素,稀土配分型式呈燕式分布,δEu值为0.11~0.26,负Eu异常明显,Y/Nb>1.2,锆石饱和温度较高,为791~829℃,属于高分异的A2型花岗岩。黑云母二长花岗岩中锆石具有低的εHf(t)值(-7.3~-0.4),对应的Hf同位素二阶段模式年龄(TDM2)为1198~1632 Ma,指示其可能是在伸展构造环境中及低压、高温条件下由古老壳源基底物质部分熔融形成,并伴有少量幔源岩浆的加入,随后在岩浆侵位过程中发生了一定程度的分离结晶。结合区域地质资料,认为径尾黑云母二长花岗岩的形成可能与俯冲古太平洋板块的后撤所导致的岩石圈伸展过程有关。

关键词：锆石U-Pb定年地球化学 A型花岗岩早白垩世板片回撤

Geochemical distribution, fractionation, and sources of heavy metals in dammed-river sediments: the Longjiang River, Southern China

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2019年第2期38卷 190-201页

作者： xiaolong Lan Zengping Ning Yizhang Liu Qingxiang xiao Haiyan Chen Enzong xiao tangfu xiao State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of Education School of Environmental Science and Engineering Guangzhou University

In the present study, six sediment cores were collected from six river-dammed reservoirs to reveal the geochemical distribution of heavy metals(As, Cd, Pb, Sb,and Zn) in the Longjiang River, South China, which is highly impacted by nonferrous metal mining and smelting activities. The sediments were geochemically characterized, combining geochemical analysis, sequential extractions, and210 Pb chronology. The results indicated that the river sediments were severely polluted by heavy metals in the order of Cd [ Zn & Pb & Sb [ As. These heavy metals generally exhibited relatively low enrichment in the upstream sediments because of the limited anthropogenic impact, but their abundances drastically increased in the midstream sediments due to local smelting activities. In downstream sediments, the heavy metal concentrations(except for Cd) decreased, owing to the effect of dam interception and detrital inputs. Cadmium levels tended to increase in downstream sediments, which were attributed to the intensive discharge of Cd during the pollution event in 2012. The sedimentary records were traced back to1985, and a significant decrease of heavy metal enrichments could be found after the year 2000, suggesting the enhancement of environmental management in this *** statistical results indicated that local metal smelting and mining activities were the main anthropogenic contributors for the enrichment of heavy metals in the dammed-river sediments. High enrichment factor and nonresidual fractions of heavy metals in local sediments may pose a direct threat to aquatic organisms. Cd presents significant danger because of its extreme enrichment and high labile fractions.

关键词： Heavy metals Fractionation 210pb dating Smelting and mining activities Sediment cores The Longjiang River

Roles of soluble minerals in Cd sorption onto rice straw biochar

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第3期34卷 64-71页

作者： Ying-heng Fei Zuannan Zhang Zhuofeng Ye Qihang Wu Ye-tao Tang tangfu xiao School of Environment Science and Engineering Guangzhou UniversityGuangzhou 510006China School of Environment Science and Engineering Sun Yat-sen UniversityGuangzhou 510006China

Transforming to biochar provides an environmentally friendly approach for crop residue reutilization,which are usually applied as sorbent for heavy metal *** typical siliconrich material,the specific sorptive mechanisms of rice straw derived biochar(RSBC)are concerned,especially at the low concentration range which is more environmentally *** the present study,Cd sorption onto RSBCs at the concentration of ≤5 mg/L was *** sorptive capacity was positively correlated with the pyrolytic temperature of the biochar and the environmental pH *** soluble minerals of the RSBCs played the dominant roles in Cd sorption,contributing 29.2%,62.5%and 82.9%of the total sorption for RSBCs derived under 300℃,500℃and 700℃,*** number of cations,dominantly K^(+),were exchanged during the *** with cations and carbonates may also be contributive to the *** dissolution of silicon-containing minerals was found to be declined during sorption,suggesting its involvement in the sorption process,possibly through ***,the sparingly soluble silicate crystals may impose ignorable role in the *** with organic groups is only a minor mechanism in Cd sorption,compared to the much more dominant roles of the inorganic ashes.

关键词： Cadmium Sorption Rice straw Biochar Silicon-rich

在线全文

学校读者我要写书评

暂无评论

除铁减酸反应池处理酸性矿山废水的效果研究

地球与环境 2024年第4期52卷 509-524页

作者：付金帅宁增平李航肖唐付姚冬菊刘意章孙静刘承帅重庆三峡学院环境与化学工程学院重庆404000 中国科学院地球化学研究所环境地球化学国家重点实验室贵阳550081 广州大学环境科学与工程学院广州510006 贵州民族大学生态环境工程学院贵阳550025

通过对除铁减酸反应池(RIAUM)处理酸性矿山废水(AMD)的效果进行持续监测与系统采样分析,查明了RIAUM处理系统中AMD的pH、酸度、总铁以及亚铁等理化指标的变化规律,评估了RIAUM处理系统对不同理化指标的净化效果,探讨了RIAUM各单元的潜... 详细信息

通过对除铁减酸反应池(RIAUM)处理酸性矿山废水(AMD)的效果进行持续监测与系统采样分析,查明了RIAUM处理系统中AMD的pH、酸度、总铁以及亚铁等理化指标的变化规律,评估了RIAUM处理系统对不同理化指标的净化效果,探讨了RIAUM各单元的潜在除铁减酸机制。结果表明:RIAUM处理系统运行效果稳定,具有良好的除铁减酸能力,Fe平均去除率在94.00%以上,出水Fe浓度满足《煤炭工业污染物排放标准(GB 20426—2006)》的限值要求;酸度平均去除率为70.29%;此外,RIAUM对Mn、Pb、Cr、Cd、SO_(4)^(2-)均具有一定的去除效果,去除率分别为37.34%、61.65%、86.82%、39.42%、28.56%。RIAUM的潜在除铁减酸机制主要为:氧化沉淀反应单元通过化学氧化沉淀作用和帷幕吸附与过滤作用除铁;微生物反应单元可能存在“二元”Fe净化机制,即在表层水体中,除化学氧化作用外,微生物如铁氧化细菌介导催化了Fe(Ⅱ)的快速氧化沉淀,而在底层水体中则可能依靠硫酸盐还原菌等厌氧细菌介导的SO_(4)^(2-)的还原产生的S2-与水体中的Fe反应生成低溶解度的铁硫化物沉淀,但该作用机制还有待进一步研究证实;碱中和反应单元中,碳酸盐岩溶解能够中和酸度,提升水体pH值。除铁减酸反应池的成功应用将为酸性矿山废水的治理提供重要的理论指导和潜在的技术支撑。

关键词：除铁减酸反应池酸性矿山废水铁酸度微生物

Exposure of children to heavy metals from artisanal gold mining in Nigeria:evidences from bio-monitoring of hairs and nails

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2020年第4期39卷 451-470页

作者： Adeniyi JohnPaul Adewumi Temitope Ayodeji Laniyan tangfu xiao Yizhang Liu Zengping Ning Department of Geological Sciences Achievers UniversityOwo.Ondo StateNigeria Department of Environmental Health Sciences College of MedicineUniversity of IbadanIbadanOyo StateNigeria Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of EducationGuangzhou UniversityGuangzhou 510006China School of Environmental Science and Engineering.Guangzhou University Guangzhou 510006China State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China

In recent times,there had been reported cases of Pb poisoning in Anka gold mining area,Northwest ***,this study was carried out to determine the extent of bioaccumulation of heavy metals in the hairs and nails of children in the *** samples(twenty nails and twenty hairs)samples were collected from ten boys and ten girls of ages 5–9 residing in the *** ascertain the sources of heavy metals in children,15 soils samples,15 groundwater samples,5 samples of mine tailings,and 5 plants samples were *** and nails of the subjects were collected using internationally acceptable *** samples were kept in uncontaminated ziplock bags prior to laboratory preparation and *** samples were cleaned using nonionic detergent(triton X-100)and deionized *** hairs and nails were digested with 10 mL of 6:1 mixture of nitric acid and perchloric *** soils,mine tailings,and plants were air-dried at room temperature,sieved,and chemically digested using the aqua regia *** concentrations of metals in all the samples were determined using highperformance liquid chromatography–inductively coupled plasma–mass *** analysis was employed to unravel potential sources of metals in the *** showed that heavy metals in children of the area are above results from similar studies and pathological ranges for heavy metals in hairs and ***,heavy metals in environmental media are above the recommended *** analysis showed that the metals are mainly from mining and other anthropogenic *** of correlation between heavy metals in hairs and nails with those in geological samples revealed that heavy metal that bioaccumulates in the children of this area are mostly from contaminated environmental *** is recommended that complete remediation and effective health education be carried out in the area.

关键词： Anka Bioaccumulation Children Heavy-metals Hairs Nails

“双一流”建设背景下基于“产学研用”思路的环境功能材料课程教学改革探讨

在线全文

学校读者我要写书评

暂无评论

大学化学 2024年第6期39卷 137-144页

作者：王娜娜张高生李伙生肖唐付广州大学环境科学与工程学院广州510006

在“双一流”建设背景下,推进课程教学的“产学研用”深度融合是提升研究生培养质量以满足新时期高层次人才新需求的有效途径。本文在“产学研用”教学一体化背景下,基于目前环境功能材料课程教学存在问题,对“产学研用”一体化教学机... 详细信息

在“双一流”建设背景下,推进课程教学的“产学研用”深度融合是提升研究生培养质量以满足新时期高层次人才新需求的有效途径。本文在“产学研用”教学一体化背景下,基于目前环境功能材料课程教学存在问题,对“产学研用”一体化教学机制、教学内容和教学模式、教学手段以及教学评价体系等方面的课程教学建设进行改革探索,以期提高该课程教学质量的同时,强化对学生专业能力、科研能力和实践能力的培养,并为推动培养全方位高质量人才与社会人才需求的有效衔接提供一定参考。

关键词： “双一流”建设环境功能材料产学研用教学改革

维普期刊数据库博看期刊

Geochemistry and environmental effect of cadmium in the super-large Jinding Pb-Zn deposit,Yunnan Province, China

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2008年第1期27卷 21-27页

作者： LI Hang LI Dahua xiao tangfu HE Libin NING Zengping SUN Jialong ZHU Changsheng SHUANG Yan The State Key Laboratory of Environmentul Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Chongqing Institution of Geology and Mineral Resources Chongqing 400042 China Graduate University Chinese Academy of Sciences Beijing 100039 China

The Jinding Pb-Zn deposit in Yunnan Province is the representative of a Cd-enriched area and mining activities lead to the release of Cd into the hypergenic ecosystem, resulting in Cd pollution. The concentrations of Cd vary greatly from one type to another type of rocks in the mining district. In the host rock, Cd concentrations range from 50×10-6 to 650×10-6 with an average of 310×10-6. In primary ores, Cd concentrations range from 14×10-6 to 2800×10-6 with an average of 767×10-6. However, in oxidized ores, Cd concentrations are highest, varying within the range of 110×10-6 to 8200×10-6 , averaging 1661×10-6. It is shown that the oxidized ores are the main carrier and environmental source of Cd. Leaching test showed that Pb/Zn ores are easy to oxidize and thereafter release Cd and other harmful elements. These leached elements in the leachate may be precipitated rapidly in the order of Zn>Pb>Cd. As for the concentration distribution of Cd in the Bijiang River, it is estimated to be 15.7 μg/L Cd in water, 49.3 mg/L in suspended substances, and 203.7 mg/L in sediments. The average value of Cd in soil from the polluted area is 83.0 mg/kg. Natural weathering of Cd-rich rocks and minerals imposes a potential environmental risk on the aquatic ecosystem of the Bijiang catchment.

关键词：地理特征环境系统镉化合物测定方法