Zinc and copper bioaccumulation in fish from Laizhou Bay,the Bohai Sea     

刘金虎  曹亮  黄伟  张传涛  窦硕增 《中国海洋湖沼学报》2014,32(3):491-502

Abstract Zinc （Zn） and copper （Cu） concentrations were determined in the tissues （muscle, stomach, liver, gills, skin, and gonads） of five commercial fish species （mullet Liza haematocheilus, flathead Platycephalus indicus, mackerel Scomberomorus niphonius, silver pomfret Pampus argenteus, and sea bass Lateolabrax japonicus） from Laizhou Bay in the Bohai Sea. Metal bioaccumulation was highest in the metabolically active tissues of the gonads and liver. Bioconcentration factors for Zn were higher in all tissues （gonads 44.35, stomach 7.73, gills 7.72, liver 5.61, skin 4.88, and muscle 1.63） than the corresponding values for Cu （gonads 3.50, stomach 3.00, gills 1.60, liver 5.43, skin 1.50, and muscle 0.93）. Mackerel tissues accumulated metal to higher concentrations than did other fish species, but bioaccumulation levels were not significantly correlated with the trophic levels of the fish. Zn and Cu concentrations in the tissues were generally negatively correlated with fish length, except for a few tissues of sea bass. Risk assessment based on national and international permissible limits and provisional tolerances for weekly intake of Zn and Cu revealed that the concentrations of these two metals in muscle were relatively low and would not pose hazards to human health.  相似文献   

Metallogenic and Metamorphic Age of the Hongtoushan Copper–Zinc Massive Sulfide Deposit,Liaoning Province,China     

Ye Qian  Fengyue Sun  Yajin Zhang  Liang Huo 《Resource Geology》2014,64(1):17-24

The Hongtoushan copper–zinc deposit is the only large Archean volcanogenic massive sulfide (VMS) deposit in China. This paper presents new information on the timing of metallogenesis and metamorphism of the deposit, including new cathodoluminescence (CL) images, and Th U^?1 and LA–ICP–MS U–Pb dating on zircons of the biotite–plagioclase gneiss and plagioclase–amphibole gneiss that host the deposit. The CL images and Th U^?1 ratios indicate that the zircons within the gneiss are of metamorphic origin. LA–ICP–MS dating of the plagioclase–amphibole gneiss yielded the upper intercept ages of 2549 Ma, and the biotite–plagioclase gneiss yielded the upper intercept ages of 2552 Ma and 2550 Ma correspondingly, indicating that the mineralization of the deposit occurred at around 2550 Ma. The rims of zircons within these host rocks yielded younger U–Pb ages at 2529, 2520 and 2515 Ma, identical to the age of felsic intrusive rocks in the study area. This suggests that the Hongtoushan VMS deposit underwent initial metamorphism and deformation at around 2520 Ma by the intrusion of granite magmas.  相似文献   

新疆阿克陶县有色矿石的非金属元素成分分析     

阿里木江&#;艾拜都拉  程春英 《岩矿测试》2014,33(1):44-50

岩矿测试和分析更多关注矿石矿物中的金属离子,但其中阴离子及其存在形式的研究对于理解矿石的组成、成因和金属离子的存在状态具有重要意义。本文采用红外光谱、X射线电子能谱和热重分析等方法对新疆阿克陶县奥依塔克镇的有色矿石中非金属元素进行成分分析。研究结果表明,矿石含有H、C、O、Si等非金属元素,主要以—C—O、C═O、Si—O—C和Si—O阴离子的形式存在,并与Mg、Al、Ca等主要金属元素形成γ-Al2O3、CaO·SiO2、MgCO3、CaCO3等化合物。样品煅烧到900℃,导致样品损失水分并使其中的MgCO3发生分解,而CaCO3不分解,分解产生的MgO与Si—O结合生成MgO·SiO2,表明矿石主要含有碳酸盐和硅酸盐,是具有白云石矿石特性的混合型矿石。  相似文献   

桂西念寅铝土矿稀土元素地球化学特征及物质来源分析     

林宇 《地质与勘探》2014,50(1):58-66

[摘要]桂西靖西念寅铝土矿不整合于早二叠茅口灰岩之上,分析其稀土元素地球化学特征对研究其物质来源具有重要意义。对念寅原生铝土矿、堆积型铝土矿及其围岩的11个样品进行稀土元素含量测试,并同靖西、平果等地各类铝土矿、茅口灰岩等样品对比分析,结果表明: （1）念寅铝土矿主量元素主要SiO₂、Fe₂O₃、Al₂O₃、TiO₂组成,Al₂O₃与Fe₂O₃和SiO₂呈负相关;（2）念寅铝土矿球粒陨石标准化曲线与茅口灰岩配分曲线趋势一致,具有ΣREE富集、LREE与HREE分异且LREE相对富集、Eu负异常等显著特征;（3）念寅铝土矿显示出被动大陆边缘地带海相沉积的典型特征,原生铝土矿成矿物质来源主要为下伏的茅口灰岩。  相似文献   

内蒙拜仁达坝银铅锌多金属矿床地球化学异常分带模型研究     

周锋  ;陈远荣  ;卢月玲  ;廖徳好  ;林立保  ;张冠清  ;陈纪凌 《矿产与地质》2014,(3):365-369

拜仁达坝银锌多金属矿床为岩浆热液矿床,通过分析该矿床不同中段微量元素和烃类组分的含量变化特征及其异常展布规律,建立了该矿床的地球化学异常分带模型。  相似文献   

陕西小秦岭地区熊耳群火山岩型铁(钛)矿及资源潜力     

李六权  ;张华莉 《陕西地质》2014,(2):13-19

对小秦岭地区熊耳群地层的分布作了概述。在熊耳群地层分布区划出了坝源—洛源(A区)、三岔—石门(B区)和西峪河—梧桐河(C区)三个火山岩型铁矿资源潜力区。阐述了各潜力区的铁矿成矿条件,对潜在资源量作了测算。预测全区300 m以上铁矿潜在资源量为≥9.4亿吨,钛铁矿≥300万吨。  相似文献   

Mineralogy of metal contaminated estuarine sediments,Derwent estuary,Hobart, Australia: implications for metal mobility     

D. Gregory  S. Meffre  R. R. Large 《Australian Journal of Earth Sciences》2013,60(5):589-603

The mobility, bioaccessibility and transfer pathways of metals and metalloids in estuarine sediments have been the focus of much detailed research. However, to date, few studies have examined the mineralogical siting of metals and metalloids in such sediments. This is despite the fact the mineralogy of sediments is an important factor that controls which and how much of a particular metal is released to pore waters and overlying water columns. This study reports on the mineralogical siting of metals in contaminated estuarine sediments, Hobart, Australia, and aims to evaluate the mobility of metals in the contaminated substrates. Mineralogical, mineral chemical and bulk chemical analyses demonstrate that the sediments contain very high levels of several metals and metalloids. The contaminated sediments have concentrations of zinc (Zn), lead (Pb), copper (Cu) and cadmium (Cd) ranging from 0.55 to 4.23 wt%, 0.16 to 0.70 wt%, 415 to 951 mg/kg and 23 to 300 mg/kg, respectively. Franklinite and lesser sphalerite are the main repositories of Zn, whereas much of the Pb and Cu is hosted by sulfides, organic matter and undetermined iron (Fe) oxides. While the release of contaminant loads from franklinite through dissolution is likely to be insignificant, even small releases of metals from the highly contaminated sediments can still cause the deterioration of local water quality. The contaminated sediments represent long-term sources of metal pollutants, particularly Zn, to local waters. This study demonstrates that mineralogical analyses are a vital tool to recognise the potential mobility of trace metals in estuarine environments.  相似文献   

A 24 h investigation of the hydrogeochemistry of baseflow and stormwater in an urban area impacted by mining: Butte,Montana     

Christopher H. Gammons  Christopher L. Shope  Terence E. Duaime 《水文研究》2005,19(14):2737-2753

Changes in water quality during a storm event were continuously monitored over a 24 h period at a single location along an urban stormwater drain in Butte, Montana. The Butte Metro Storm Drain (MSD) collects groundwater baseflow and stormwater draining Butte Hill, a densely populated site that has been severely impacted by 130 years of mining, milling, and smelting of copper‐rich, polymetallic mineral deposits. On the afternoon of 26 June 2002, a heavy thunderstorm caused streamflow in the MSD to increase 100‐fold, from 0·2 ft³ s⁻¹ to more than 20 ft³ s⁻¹. Hourly discharge and water quality data were collected before, during, and following the storm. The most significant finding was that the calculated loads (grams per hour) of both dissolved and particulate copper passing down the MSD increased more than 100‐fold in the first hour following the storm, and remained elevated over baseline conditions for the remainder of the study period. Other metals, such as zinc, cadmium, and manganese, showed a decrease in load from pre‐storm to post‐storm conditions. In addition to the large flush of copper, loads of soluble phosphorus increased during the storm, whereas dissolved oxygen dropped to low levels (<2 mg l⁻¹). These results show that infrequent storm events in Butte have the potential to generate large volumes of runoff that exceed Montana water quality standards for acute exposure of aquatic life to copper, as well as depressed levels of dissolved oxygen. This study has important implications to ongoing reclamation activities in the upper Clark Fork Superfund site, particularly with respect to management of storm flow, and may be applicable to other watersheds impacted by mining activities. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

不同氧化还原条件下铅锌矿尾砂中重金属元素活化迁移规律     

李晓艳  张青伟  洪松涛  袁雨婷  余金燕  潘俐傧  刘莹红 《吉林大学学报(地球科学版)》2022,52(2):434-441

以广西大厂镇鲁塘铅锌矿尾砂为研究对象,通过淋滤实验研究了不同氧化还原条件下尾砂中Cu、Cd、Zn、Pb和As等元素的活化和迁移规律。结果表明：经高浓度氧化、高浓度还原条件处理的尾矿表现为pH<7的酸性环境,经低浓度氧化环境条件处理的尾砂呈现pH>7的弱酸性至弱碱性环境;尾砂中Cu、Cd元素活化迁移受pH值的影响明显,即高浓度还原和高浓度氧化条件可以促进Cu和Cd元素的迁移,酸性条件对Cu和Cd元素的迁移起到促进作用;Zn与Cd元素存在竞争吸附关系,但二者仍有明显差别;Pb和As元素受到还原条件的影响,能有效促进Pb和As元素的释放迁移。在淋滤实验前期,铅锌矿的表面阻力较小,由于环境酸碱性的改变,初始尾砂对重金属元素的吸附位能发生变化,重金属元素初期迁移能力得到加强;淋滤后期,矿物颗粒表面由于发生氧化还原反应,促使颗粒表面的阻力增加,重金属元素的溶出量减少,迁移能力受到抑制。  相似文献   

●●以下文章网络预出版（在线出版）于2022年12月20日，预计刊于《地质论评》2023年第69卷第1期(2023年1月15日发行纸质版）或2023年第69卷第2期（2023年3月15日发行纸质版）     

朱炜  张艳  韩润生  王磊  佘敏  魏平堂 《地质论评》2022,68(6):2022112011-2022112012

元素富集机制的研究是重现成矿过程和查明成矿机制的基础,有助于深化对矿床的认识,为找矿提供理论依据。本文总结了近年来关于铅锌元素的迁移与沉淀机制的研究及其应用,包括3种铅锌迁移沉淀模式,4种含铅锌流体驱动模式,铅锌的迁移形式及其沉淀机制;同时简述了我国高温高压实验的发展历程以及4种高温高压模拟实验方法。重点介绍了4种高温高压实验模拟方法及其研究现状：① 高压釜实验;② 热液金刚石压腔—激光拉曼实验;③ 熔融毛细硅管—激光拉曼实验;④ 计算机模拟实验。从封闭—平衡—静止到（半）开放—非平衡—流动、淬火分析到原位观察,应是今后高温高压实验的发展方向。以地质特征为基础,采用高温高压成岩成矿模拟实验结合计算机模拟,精细刻画成矿过程并揭示元素富集机制不仅是解决实际地质问题的有效手段,更是很长一段时间内要为之努力的方向。  相似文献