共查询到15条相似文献，搜索用时 93 毫秒
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西藏甲玛铜多金属矿元素分布规律及地质意义 总被引：18，自引：7，他引：11
甲玛铜多金属矿床已经成为冈底斯成矿带内为数不多的铜品位高、规模大、矿体连续性好的超大型斑岩-矽卡岩-角岩型铜多金属矿床。文章根据167个钻孔的成矿元素化学分析结果,对各元素平面分带、（Pb+Zn）/Cu、Au/Cu、Mo/Cu、Pb/Ag、Zn/Pb、Zn/Cu比值分带以及剖面上元素的分带等进行了系统分析,认为甲玛铜多金属矿具有典型的与岩浆成矿作用有关的元素分带特征,矿体由深部向浅部具有Mo→Mo（Cu）→Cu+Mo→Cu（Pb+Zn+Mo）→Cu（Pb+Zn）→Pb+Zn的成矿元素分带现象,具有高温→中低温成矿演化的特点。研究提出,成矿流体的运移方向是由北东至南西,流体源位于矿区北东部的则古朗地区。这种典型的热液分带特征同海底喷流沉积矿床近管道相Pb/Ag比值高、远离喷口Zn/Pb、Zn/Cu比值高的元素分带特征有着本质的区别。矿区北部则古朗地区高Mo/Cu比值以及钼元素矿化强度随标高降低愈强的分布特点,均预示了该地区是深部隐伏含矿斑岩体之所在。 相似文献
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宁沪高速公路句容段两侧土壤磁化率异常与重金属元素的关系研究 总被引：1，自引：0，他引：1
高速公路两侧土壤的磁化率从路中央向两侧具有逐渐降低的特征,相对应的样品中的重金属Cu、Pb、Zn、N i、Cr、Fe等元素的含量也具有从路中心向两侧逐渐降低的现象。相关分析表明,土壤磁化率与土壤中的Cu、Pb、Zn、N i、Cr、Fe的相关性显著,因而可以利用磁化率异常来指示高速公路两侧土壤的重金属污染状况。元素的赋存形态分析表明铁锰氧化物态与残渣态是Cu、Pb、Zn、N i、Cr、Fe的主要赋存形式;各元素的形态分析结果与土壤磁化率的相关统计分析表明,高速公路两侧土壤的磁化率与可交换态中的Cu、Pb、Zn、铁锰氧化物态中的Fe、Pb、Zn、有机还原态中的Cu、Cr、Fe、Zn和残渣态中的Cu、Pb、Zn、Cr、Co、N i具有明显的相关性。 相似文献
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Distribution and sequential extraction of some heavy metals in urban soils of Guiyang City,China 总被引：1，自引：1，他引：0
Sixty-two soil samples collected from different functional zones of Guiyang were analyzed for total concentrations and sequential extraction of Cr, Cu, Pb, Zn and Cd by ICP spectrometry. The average total concentrations ofCr, Cu, Pb, Zn and Cd in the soils of Guiyang were 92.9, 51.6, 44.1,139.3 and 0.28 mg/kg, respectively. The soils have been polluted by Cr, Cu, Pb, Zn and Cd to some extent in comparison with the background values of Guiyang. Significant differences were recognized in the concentrations of Cr, Cu, Pb, Zn and Cd in different functional zones. As for the sequential extraction, Cr, Cu and Zn were present mainly in the residual fraction, and Pb was present mainly in the oxidizable fraction. The reducible fraction of Cd accounts for 47.5%, and the residual fraction is lowest. The mobility and bioavailability of heavy metals follow the order of Cd〉Pb〉Cu〉Cr〉Zn. 相似文献
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成都市某蔬菜基地重金属污染状况分析 总被引：12，自引：0，他引：12
分别用原子吸收和原子荧光光谱法，研究了成都市蔬菜基地蔬菜中Cd、Pb、Zn、Cu、Hg、As的含量和相应的土壤中Cu、Zn、Pb、Cd的含量。研究结果表明蔬菜中重金属含量均低于国家食品卫生标准。蔬菜中Cd、Zn、Cu、Hg主要来自土壤，Pb、As主要来自大气降尘。温室种植能有效地避免蔬菜Pb、As的污染。温室无土栽培应注液培养基中的重金属含量，以免导致二次污染。 相似文献
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土壤-农作物重金属富集规律是土壤和农作物重金属风险管控的关键问题。通过实地调查、现场采样、实验测试、综合分析等方法,重点研究了金矿活动影响区内的土壤Hg、Pb、Cr、As、Cu、Zn等重金属元素的全量、有效态含量特征,以及小麦不同部位与立地土壤中重金属含量之间的关系。结果表明:土壤Hg、Pb、Cu元素累积显著,Hg、Pb含量平均超标倍数为6.65、2.04倍;土壤中Hg(34.44%)、Pb(83.31%)、Cu(44.24%)、Zn(40.82%)的有效态含量占相应重金属全量的比例高,是危害农作物的主要元素;小麦籽中Hg、Pb、Zn元素平均超标率分别为26.33%、100%、26.32%;除Zn元素外,Hg、Pb、Cr、As、Cu含量全部符合籽粒茎杆根须土壤的规律;重金属含量的富集率平均值排序为Zn(30.54%)Cu(10.33%)Pb(0.45%)As(0.38%)Hg(0.14%)Cr(0.13%),Zn、Cu是小麦富集能力强的重金属元素。 相似文献
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广东紫金风门坳矿区富集Sn、W、Pb、Zn、Cu、Mo、Au、Ag、As等元素,但分布不均匀,具有叠加富集特征。通过在风门坳矿区开展1∶10 000土壤地球化学测量工作,圈定了2处矿致综合异常,结合各矿床（点）成矿特征,认为风门坳矿区成矿元素自北西向南东依次为Sn、W、Pb、Zn、Cu、Mo→Sn、Cu、Au→Pb、Ag、Zn,呈规律性水平分带。结合矿区3号勘探线矿化（体）特征,认为矿床成矿元素在垂直方向自上而下分带为Sn、W、Pb、Zn→Cu、Zn、Ag→Sn、Zn。上述规律可为今后在该区继续开展扩大扩深找矿工作提供有利线索。 相似文献
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广东紫金风门坳矿区富集Sn、W、Pb、Zn、Cu、Mo、Au、Ag、As等元素,但分布不均匀,具有叠加富集特征。通过在风门坳矿区开展1∶10 000土壤地球化学测量工作,圈定了2处矿致综合异常,结合各矿床（点）成矿特征,认为风门坳矿区成矿元素自北西向南东依次为Sn、W、Pb、Zn、Cu、Mo→Sn、Cu、Au→Pb、Ag、Zn,呈规律性水平分带。结合矿区3号勘探线矿化（体）特征,认为矿床成矿元素在垂直方向自上而下分带为Sn、W、Pb、Zn→Cu、Zn、Ag→Sn、Zn。上述规律可为今后在该区继续开展扩大扩深找矿工作提供有利线索。 相似文献
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对拜仁达坝铅锌矿矿集区3个多金属矿区的3个土壤粒级样品中Zn、Pb、Cu、Ag 4种主要成矿元素的7种赋存形式(水溶态、离子交换态、碳酸盐结合态、有机质结合态、铁锰氧化物结合态、硫化物结合态和残渣态)进行了测定。研究结果表明:1银都矿区土壤中Zn、Pb和Ag浓度最高,而道伦达坝矿区土壤中Cu的浓度最高;2拜仁达坝矿集区土壤中Zn、Pb和Cu主要以残渣态形式赋存,而Ag主要以铁锰氧化物结合态和硫化物结合态形式赋存;3拜仁达坝矿集区Zn、Pb和Cu元素在3个土壤粒级中的各个赋存形式所占的比例略有差别,但总体上大致相同,而Ag元素的赋存状态在3个土壤粒级的差异较大;4 3个矿区土壤中水溶态、离子交换态、碳酸盐结合态和有机质结合态的Zn和Pb差别不大;铁锰氧化物结合态、硫化物结合态和残渣态的Zn和Pb,以及Cu和Ag的7个赋存状态在3个矿区的差别较大。 相似文献
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QI Yong LIU Yu 《《地质学报》英文版》2006,80(2):226-229
In this paper, the behaviors of aqueous zinc sorption by hydroxyapatite in the co-existence of Pb^2＋, Cd^2＋ and Cu^2＋ are investigated, the effects of Pb^2＋, Cd^2＋ and Cu^2＋ on the sorption of Zn^2＋ are discussed, and the hydroxyapatite sorption capabilities for Pb^2＋, Cd^2＋, Cu^2＋ and Zn^2＋ are compared. The experimental results show that the Zn^2＋ removal efficiency decreases gradually with the increase of the Cd^2＋ concentration of the solution, and there is no sorption preference between Cd^2＋ and Zn^2＋. On the other hand, the Zn^2＋ removal efficiency rapidly decreases rapidly with the increase of the Cu^2＋ concentration of the solution, and there is a clear sorption preference between Cu^2＋ and Zn^2＋. It is noticed that the Zn^2＋ removal efficiency is hardly changed with the variance of Pb^2＋ concentration because the removal mechanisms for these two ions are totally different. It is concluded that the adsorption affinities of the heavy metals for the hydroxyapatite follows this sequence： pb^2＋〉 Cu^2＋〉 Cd^2＋〉 Zn^2＋. 相似文献
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《International Geology Review》2012,54(5):379-420
Variations in the abundances of Zn, Cu, and Pb are found to be useful in identifying tectonic regimes and separating oceanisland basalts into enriched- and depleted-source categories. The average Zn, Cu, and Pb contents of normal mid-ocean ridge basalts (N-MORB) are 84, 70, and 0.35 ppm, respectively. Differences in average Zn contents for various ridges reflect more the varying degrees of differentiation than variations of Zn content in the source rocks. At a Mg# of 70, or Mg#70, which is taken to represent primitive MORB, many MORB sequences converge at a Zn content of 58 ± 6 ppm, which is close to the value for primitive mantle (50 ppm) and ordinary chondrites (～55 ppm). Values of 0.1 to 0.15 ppm Pb in MORB at Mg#70, best defined at the superfast-spreading Southern East Pacific Rise, are similar to estimates of Pb in the primitive mantle (0.12 to 0.18 ppm). They also are near the lower end of the range for ordinary chondrites. The very slow spreading Southwest Indian Ocean Ridge has a sequence with higher Pb contents, in addition to a more normal sequence, which has a visual best value of 0.4 ppm Pb at Mg#70. With the exception of the Walvis Ridge, Zn and Cu appear to be little affected by proximity to hotspots (i.e., E-MORB); however, Pb contents are higher and average about 0.6 ppm. Both Zn and Pb in MORB are incompatible elements (i.e., favor the melt), but Cu is a compatible element. At Mg#70, there is the suggestion of a value of 100 ppm for Cu, with lower values possibly representing partial removal of sulfides and their associated Cu from the source. Nonetheless, Cu contents of primitive MORB tend to be much higher than even high estimates for the primitive mantle (28 ppm), and are closer to ordinary chondrites (～90 ppm). Therefore, Zn, Cu, and Pb all approximate chondritic values in the primitive MORB melt. Average contents of Zn, Cu, and Pb in oceanic island basalts (OIB) are 115, 62, and 3.2 ppm, respectively. At Mg#70, values of Zn and Cu are similar to the respective averages for OIB, with Zn higher and Cu lower than MORB. At a Mg# of ～40, however, OIB and MORB tend to have similar Zn contents. With further differentiation, OIB trachytes can contain >200 ppm Zn. Unlike MORB, OIB can differentiate to high Cu contents of 200 ppm at Mg#s of 40 to 60. In contrast to Zn and Cu, Pb regresses to a value of 0.83 ppm at Mg#70 for Hawaiian and Reunion volcanics, which is much less than the average value for Pb in OIB volcanics, but higher than for MORB. Average Zn, Cu, and Pb contents of magmatic-arc basalts are 77, 108, and 1.9 ppm, respectively. In basalts, Zn tends to be incompatible, but a dual incompatible and compatible behavior can occur at high SiO2 contents. Dacites may average near 55 ppm Zn, but peralkalic rhyolite can contain >300 ppm Zn. A dual compatible and incompatible nature occurs for Cu. Most common, particularly in submarine volcanics, is a compatible trend, with a Cu content of around 80 ppm at a Mg# of 60, which decreases to less than 40 ppm at a Mg# of 30. The incompatible trend of increasing Cu can achieve >200 ppm at a Mg# of 30, leaving a gap approaching 100 ppm at that Mg#. The gap is less obvious on a plot of Cu vs. SiO2, but is still there. The compatible trend is proposed to result from sulfur-saturated magmas, whereas the incompatible trend is believed to result from sulfur-deficient magmas. Support for this hypothesis is found in sparse sulfur-isotope data. Zn and Cu both can be incompatible over an extended range of Mg#s or silica content. When Zn and Cu are both compatible, Cu decreases more than twice as rapidly as Zn. Primitive magmas at Mg#70 average about 50 ppm Zn for submarine Mariana arc basalts and 58 ppm for forearc boninites, contents close to MORB values. Mariana arc basalts have a Zn content of ～45 ppm estimated at Mg#70. Cu varies more widely than Zn in primitive magmas, being about 50 ppm Cu for Mariana Islands volcanics and 120 ppm for Kermadec Islands volcanics, a range broadly around MORB values. Average Pb contents are 1.9 ppm for island-arc tholeiites, 5.6 ppm for high-Al basalt, and 3.2 ppm for alkali basalt with average boninite of approximately 1.8 ppm. Back-arc-basin basalts in the deepest parts of the Mariana trough have Pb contents of 0.45 ppm, but more shallow parts may exceed 1.0 ppm Pb. Although the lower contents are similar to MORB values, the 208Pb/204Pb values are greater than Pacific Ocean MORB. At Mg#70 for rocks from the Tonga and Kermadec island arcs, the Pb content is about 0.1 ppm, similar to MORB. 相似文献
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新疆东天山沙泉子地区地球化学特征及找矿预测 总被引：7，自引：0，他引：7
新疆东天山沙泉子地区位于雅满苏—沙泉子成矿区的东段 ,地层简单 ,但岩性复杂。受沙泉子深大断裂及沙泉子火山机构共同作用 ,地球化学异常表现为以 Cu- Zn- Ag- Mo为主的内环、以 Pb- Zn(Cu- As- Sb)为主的中环和以 Au或 Au- Ag- As- Sb异常区为主的外环 ,从中心至外围 Cu、Zn等异常强度、规模逐渐减弱 ,Au、As、Sb异常逐渐增强 ,在元素的空间分布上表现出Cu、Zn、Pb、Ag— Pb、Zn、As、Sb(Ag)— Au、As、Sb的元素分带现象。提出沙泉子北、苦水北二处找矿预测远景区 ,有较好的找矿前景 相似文献
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