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1.
新疆西天山喇嘛萨依铜矿床地质和C、O、S、Pb同位素地球化学 总被引：1，自引：0，他引：1
喇嘛萨依铜矿是新疆西天山赛里木微地块内的一处典型铜矿床,关于其成因类型尚存争议。总结了该铜矿床的地质特征,测试围岩、脉石碳酸盐的C、O同位素和硫化物的S、Pb同位素组成,探讨其成因类型。研究表明,喇嘛萨依铜矿床具有后生矿床特征,发育矽卡岩化蚀变,脉石方解石的δ13C值变化范围为-1.04‰~-0.87‰,低于围岩灰岩的δ13C值(变化范围为3.51‰~5.47‰),δ18O值变化范围为9.33‰~9.61‰,明显低于正常的海相碳酸盐岩的O同位素(δ18O=20‰~26‰),C、O同位素组成反映喇嘛萨依铜矿成矿晚阶段流体来自岩浆水和地下水的混合水;硫化物的δ34S值主要变化范围为3.75‰~8.64‰,与区域上海西期斑岩的硫同位素组成(如达巴特斑岩铜钼矿床硫化物的δ34S变化范围为4.9‰~7.9‰)接近,反映硫来源于斑岩;黄铜矿的铅同位素为206Pb/204Pb=18.264~19.544,207Pb/204Pb=15.575~15.656,208Pb/204Pb=38.103~38.705,具有富含放射成因铅、两阶段异常铅特征,与区域上海西期斑岩(达巴特流纹斑岩)的铅同位素组成特征相似,反映成矿金属物质部分来源于斑岩。通过综合分析认为,喇嘛萨依铜矿是与斑岩有关的矽卡岩型矿床。 相似文献
2.
查个勒铅锌钼铜矿床位于念青唐古拉铅锌银铁铜成矿带西段南缘,为查明其成矿物质来源及矿床成因,对该矿床开展了系统的H、O、S、Pb同位素研究,并与念青唐古拉成矿带中-东段典型铅锌(铜钼)矿床进行对比。查个勒矿床石英H、O同位素(δD值介于-189‰～-157‰之间,δ~(18)O_(H_2O)值介于-2.2‰～2.9‰之间)指示其成矿流体主要由岩浆水与大气降水混合组成。矿区北部铅锌矿体硫化物δ~(34)S值为-5.6‰～-0.8‰,均值为-3.7‰,显示岩浆硫和地层硫混合的特征。矿区南部(铜)钼矿体硫化物δ~(34)S值为1.1‰～2.6‰,均值为1.8‰,显示岩浆硫的特征。矿石硫化物和花岗斑岩全岩~(208)Pb/~(204)Pb,~(207)Pb/~(204)Pb,~(206)Pb/~(204)Pb的比值分别为38.988～39.269、39.002～39.559,15.657～15.747、15.643～15.664,18.614～18.688、18.663～19.058。矿石硫化物与花岗斑岩的Pb同位素特征相似,均表现出上地壳Pb源的特征,推测成矿物质主要来自上地壳岩浆源。查个勒矿床H、O、S、Pb同位素特征与中-东段典型铅锌(铜钼)矿床相似,表明念青唐古拉成矿带铅锌(铜钼)矿床成矿流体及成矿物质来源一致。作者认为查个勒矿床是一个受岩浆和构造共同控制的斑岩型(铜)钼+矽卡岩型-热液脉型铜铅锌矿床,在念青唐古拉成矿带,自西向东分布有多处斑岩型(铜)钼矿+矽卡岩型-热液脉型(铜)铅锌矿矿集区。 相似文献
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白音查干矿床是大兴安岭南段新发现的一处大型Sn多金属矿床。为查明该矿床Sn成矿作用与Ag-Pb-Zn成矿作用的关系,本文开展了矿床地质、萤石和石英斑岩Sr-Nd同位素、硫化物S-Pb同位素和原位S同位素地球化学特征研究。SrNd同位素分析结果显示,所有萤石样品均具有相近的(~(87)Sr/~(86) Sr)_i、(~(143)Nd/~(144)Nd)_i和ε_(Nd)(t)值范围,而且与石英斑岩的Sr-Nd同位素组成基本一致,说明矿床各成矿阶段的萤石具有相同的成因,与石英斑岩岩浆作用关系密切。单矿物和原位S同位素数据显示,Ⅰ区Ag-Pb-Zn矿石中的硫化物δ~(34)S值范围(-13.9‰～-4.8‰)与Ⅲ Sn矿石硫化物的δ~(34)S值范围(-12.5‰～-5.3‰)基本一致;而且,Ⅰ区闪锌矿原位δ~(34)S值变化范围较小且较为均一(-12.4‰～-7.3‰,平均为-9.2‰),与石英斑岩"Zn-F-B集合体"中闪锌矿原位δ~(34)S值变化范围(-10.6‰～-9.0‰,平均为-9.7‰)基本一致,说明S可能主要来源于石英斑岩岩浆。Pb同位素特征显示,Ⅰ区Ag-Pb-Zn矿石中的硫化物Pb同位素组成(~(206) Pb/~(204) Pb=18.177～18.200、~(207)Pb/~(204)Pb=15.519～15.531、~(208) Pb/~(204)Pb=37.985～38.053)与石英斑岩Pb同位素组成(~(206)Pb/~(204)Pb=18.206～18.235、~(207)Pb/~(204)Pb=15.529～15.530、~(208)Pb/~(204)Pb=38.025～38.036)基本一致,说明Ag-Pb-Zn成矿作用的Pb可能主要来源于石英斑岩岩浆。结合矿床地质特征、Sr-Nd、S、Pb同位素数据可知,白音查干矿床Sn成矿作用与Ag-Pb-Zn成矿作用具有密切的成因联系,矿床成矿流体和成矿物质可能主要来源于石英斑岩岩浆。 相似文献
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扎拉格阿木铜矿床位于锡林浩特地块北部边缘,矿体赋存于二叠纪砂质板岩和角砾岩中,受NE向断裂控制,为中温热液脉型铜矿床。本文通过流体包裹体和C?H?O?S?Pb同位素地球化学研究手段,来探讨扎拉格阿木铜矿成矿机制。成矿热液期存在5个成矿阶段：钾长石阶段、石英?绢云母阶段、石英?黄铁矿阶段、石英?多金属硫化物阶段、石英?方解石阶段。其中石英?多金属硫化物阶段为主成矿阶段,本阶段主要发育富液相、富气相、含子矿物包裹体;富液相包裹体均一温度与盐度分别为：138～289℃和2.06%～16.11% NaCl eqv;含子矿物包裹体均一温度与盐度分别为：320～374℃和32.68%～39.81% NaCl eqv,包裹体气体成分除少量CO2以外,均为H2O。H?O同位素分析表现为,石英中的〖δO〗^18值变化范围－8.5‰～7.5‰,流体的δD值变化范围为－116‰～－98‰,暗示早阶段成矿流体主要为岩浆热液,晚期伴有大气降水混入。C?O同位素分析表明,δ13C值为-6.9‰~ -10.1‰,δ18OSMOW介于2.5‰~11.7‰,在δ18O?δ13C 图上数据点落在岩浆水与大气水的中间区域。矿石硫化物的δ34S值介于-4.5‰~1.5‰,指示具有幔源岩浆硫的特征。矿石硫化物Pb同位素的208Pb/204Pb、207Pb/204Pb和206Pb/204Pb比值分别为38.034~38.609、15.497~15.655和18.141~18.446,推测Pb具有地幔来源的特点并伴有地壳或造山带Pb混入。成矿过程中伴随着流体沸腾作用,成矿物质沉淀受早期形成的岩浆热液与后加入大气降水混合的影响。 相似文献
5.
湘南宝山铅锌矿床硫、铅、碳、氧同位素特征及成矿物质来源 总被引：3，自引：1，他引：2
宝山铅锌矿床是湘南地区代表性矿床之一。宝山铅锌矿床的成矿作用与156~158 Ma的宝山花岗闪长斑岩密切相关。花岗闪长斑岩主要由古老地壳部分熔融而成。为确定成矿物质来源,文章系统研究了宝山铅锌矿床的硫、铅、碳、氧同位素组成特征。矿床中硫化物黄铁矿、闪锌矿、方铅矿的δ34S值呈狭窄的塔式分布,变化在-2.17‰~6.46‰之间,平均值为3.13‰。δ34S值总体表现为δ34S黄铁矿δ34S闪锌矿δ34S方铅矿,表明硫同位素分馏基本达到了平衡。矿石、花岗闪长斑岩和赋矿地层硫同位素对比研究表明,矿石中的硫主要由岩浆分异演化而来,岩浆中的硫主要来自古老地壳。矿石206Pb/204Pb、207Pb/204Pb和208Pb/204Pb比值分别为18.188~18.844、15.661~15.843和38.562~39.912,赋矿地层206Pb/204Pb、207Pb/204Pb和208Pb/204Pb比值分别为18.268~19.166、15.620~5.721和38.364~39.952。矿石铅同位素组成比地层中的更富放射性成因铅,矿石中部分铅来自宝山花岗闪长质岩浆,在成矿流体运移过程中有部分地层铅参与了成矿,岩浆中的铅主要来自古老地壳。热液方解石的碳、氧同位素组成介于岩浆和赋矿碳酸盐岩的碳、氧同位素之间,主要是由于岩浆流体和碳酸盐岩不同比例的水岩反应所致,测水组有机碳的加入造成了部分热液方解石δ13CPDB值偏低。 相似文献
6.
西藏驱龙斑岩铜矿S、Pb同位素组成:对含矿斑岩与成矿物质来源的指示 总被引：27，自引：0，他引：27
驱龙铜矿是西藏陆陆碰撞造山带冈底斯斑岩铜矿带内代表性矿床之一。本文对其含矿斑岩和矿石矿物进行了S、Pb同位素组成分析。驱龙矿床含矿斑岩与矿石矿物的硫同位素组成比较一致,含矿斑岩δ34S为-2.1‰~-1.1‰,黄铜矿δ34S为-6.3‰~-1.0‰,均值-2.76‰;硬石膏δ34S为 12.5‰~ 14.4‰,平均 13.4‰。成矿热液中的硫同位素基本达到了平衡,显示出岩浆硫组成特点。含矿斑岩的206Pb/204Pb范围为18.5104~18.6083,207Pb/204Pb变化于15.5946~15.7329之间,208Pb/204Pb为38.6821~39.1531之间;矿石矿物黄铜矿的206Pb/204Pb、207Pb/204Pb、208Pb/204Pb分别为18.4426~18.5909、15.5762~15.6145、38.5569~38.8568。含矿斑岩与矿石矿物的铅同位素组成比较一致,它们的变化幅度较小,应具有相同的起源与演化历史。无论是岩石铅还是矿石铅,在铅构造模式图上均位于造山带铅演化曲线上。驱龙矿床硫、铅同位素数据暗示,成矿物质主要来自深源岩浆,含矿斑岩起源于西藏造山带加厚的下地壳熔融,具有幔源成分的混染。 相似文献
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8.
边家大院银多金属矿床位于大兴安岭成矿带南段,是一个典型的热液脉型银多金属矿床。基于稳定同位素C、H、O、S和放射性Pb同位素的测试和分析,对边家大院银多金属矿床成矿流体及物质来源进行示踪。同位素测试结果表明:成矿流体中水的δD_(水-SMOW)值为-138.5‰~-111.7‰,δ~(18)O_(水-SMOW)值为-8.85‰~9.38‰,表明成矿流体为岩浆水与大气降水的混合物。热液方解石δ~(13)C_(PDB)值为-7.7‰~-2.67‰,δ~(18)O_(SMOW)为-0.41‰~6.03‰,表明热液矿物方解石是2个阶段成矿作用的产物,成矿早阶段流体与岩浆水特征相似,碳主要来源于岩浆,成矿晚阶段流体具有大气降水的特征。边家大院银多金属矿床矿石硫化物δ~(34)S值为0.76‰~4.4‰,显示银铅锌矿体的形成与岩浆作用密切相关,硫主要来自岩浆源。矿石样品~(208)Pb/~(204)Pb值介于38.1~38.634,~(207)Pb/~(204)Pb值介于15.518~15.681,~(206)Pb/~(204)Pb值介于18.155~18.284,表明成矿与岩浆作用关系密切,成矿流体中铅主要来自深源岩浆。成矿作用的发生是在一种总硫浓度比较低的平衡体系中进行的。边家大院银多金属矿床的成因类型属于火山-次火山热液脉状银多金属矿床。 相似文献
9.
《现代地质》2016,(5)
鱼库锌多金属矿床位于豫西栾川钼钨铅锌银矿集区内的鱼库—赤土店铅锌矿带的北西端。矿床赋存于新元古界栾川群三川组碳酸盐岩夹碎屑岩地层中,矿体呈似层状、透镜状产于透辉石-石榴石矽卡岩中,受矽卡岩带控制。硫化物的硫同位素组成比较稳定,δ~(34)S变化范围为2.3‰~3.9‰,平均3.2‰。硫同位素组成与区域内斑岩-矽卡岩型矿床的硫同位素组成一致,反映硫的主要来源为深部岩浆;金属硫化物样品的~(206)Pb/~(204)Pb变化范围为17.781~18.455,平均值18.043;~(207)Pb/~(204)Pb变化范围为15.502~15.590,平均值15.545;~(208)Pb/~(204)Pb变化范围为38.232~38.624,平均值38.438,矿石铅同位素组成稳定,矿石铅主要来源于地幔,成矿作用与构造岩浆作用相关的热液过程关系密切。综合分析认为矿床成因应属于岩浆热液接触交代矽卡岩型矿床。 相似文献
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江西德兴地区是中国重要的金属矿产资源聚集地,主要矿床有德兴斑岩铜矿(包括朱砂红、铜厂和富家坞)、金山金矿、银山Pb-Zn-Ag多金属矿和蛤蟆金矿等.这些矿床可以划分为与剪切带有关的金矿和与岩浆热液成矿作用有关的铜金钼铅锌银矿床(如德兴斑岩Cu-Mo-Au矿床和银山Pb-Zn-Ag-Cu-Au矿床).在控矿构造、成矿元素组合、成矿流体来源、矿床地球化学等方面这两类矿床都有明显的差异;二者成矿年龄的差异显示它们是不同地质时期演化的结果.剪切带型金矿(如金山金矿)与斑岩铜矿(德兴铜矿)在成因上没有明显的直接关系,它们非单一同一岩浆系统的产物. 相似文献
11.
E. M. Prasolov S. A. Sergeev B. V. Belyatsky E. S. Bogomolov K. A. Gruzdov I. N. Kapitonov R. Sh. Krymsky V. O. Khalenev 《Geochemistry International》2018,56(1):46-64
This paper reports the first results of a study of 11 isotope systems (3He/4He, 40Ar/36Ar, 34S/32S, 65Cu/63Cu, 62Ni/60Ni, 87Sr/86Sr, 143Nd/144Nd, 206–208Pb/204Pb, Hf–Nd, U–Pb, and Re–Os) in the rocks and ores of the Cu–Ni–PGE deposits of the Norilsk ore district. Almost all the results were obtained at the Center of Isotopic Research of the Karpinskii All-Russia Research Institute of Geology. The use of a number of independent genetic isotopic signatures and comprehensive isotopic knowledge provided a methodic basis for the interpretation of approximately 5000 isotopic analyses of various elements. The presence of materials from two sources, crust and mantle, was detected in the composition of the rocks and ores. The contribution of the crustal source is especially significant in the paleofluids (gas–liquid microinclusions) of the ore-forming medium. Crustal solutions were probably a transport medium during ore formation. Air argon is dominant in the ores, which indicates a connection between the paleofluids and the atmosphere. This suggests intense groundwater circulation during the crystallization of ore minerals. The age of the rocks and ores of the Norilsk deposits was determined. The stage of orebody formation is restricted to a narrow age interval of 250 ± 10 Ma. An isotopic criterion was proposed for the ore-bearing potential of mafic intrusions in the Norilsk–Taimyr region. It includes several interrelated isotopic ratios of various elements: He, Ar, S, and others. 相似文献
12.
奥地利安东帕有限公司 《岩矿测试》2009,28(3):306-306
最新的流行病学研究表明,空气中较高浓度的悬浮细颗粒可能对人类的健康有不利的影响。根据该项研究显示,由于心脏病、慢性呼吸问题和肺功能指标恶化而导致死亡率的升高与细尘粒子有关。这些研究结果已经促使欧盟于1999年4月出台了限制空气中二氧化硫、二氧化氮、氧化氮、铅和颗粒物含量的法案(1999/30/EC),对各项指标包括对可吸入PM10颗粒的浓度提出了新的限制性指标。PM10颗粒是指可以通过预分级器分离采集的气体动力学直径小于10μm的细颗粒。目前研究的兴趣重点逐步偏向PM2.5这些更细微颗粒物,PM2.5这种颗粒物对健康有明显的不利影响。在欧盟指令2008/50/EC中,对PM10和PM2.5都提 相似文献
13.
S. Viswanathan K. Surya Prakash Rao B. Mahabaleswar 《Journal of the Geological Society of India》2013,82(6):621-627
Komatiites are mantle-derived ultramafic volcanic rocks. Komatiites have been discovered in several States of India, notably in Karnataka. Studies on the distribution of trace-elements in the komatiites of India are very few. This paper proposes a simple, accurate, precise, rapid, and non-destructive wavelength-dispersive x-ray fluorescence (WDXRF) spectrometric technique for determining Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in komatiites, and discusses the accuracy, precision, limits of detection, x-ray spectral-line interferences, inter-element effects, speed, advantages, and limitations of the technique. The accuracy of the technique is excellent (within 3%) for Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Zr, Nb, Ba, Pb, and Th and very good (within 4%) for Y. The precision is also excellent (within 3%) for Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th. The limits of detection are: 1 ppm for Sc and V; 2 ppm for Cr, Co, and Ni; 3 ppm for Cu, Zn, Rb, and Sr; 4 ppm for Y and Zr; 6 ppm for Nb; 10 ppm for Ba; 13 ppm for Pb; and 14 ppm for Th. The time taken for determining Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in a batch of 24 samples of komatiites, for a replication of four analyses per sample, by one operator, using a manual WDXRF spectrometer, is only 60 hours. 相似文献
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《Applied Geochemistry》2001,16(2):137-159
Five hundred and ninety-eight samples of terrestrial moss (Hylocomium splendens and Pleurozium schreberi) collected from a 188,000 km2 area of the central Barents region (NE Norway, N Finland, NW Russia) were analysed by ICP-AES and ICP-MS. Analytical results for Al, B, Ba, Ca, K, La, Mg, Mn, Na, P, Rb, Si, Sr, Th, U and Y concentrations are reported here. Graphical methods of data analysis, such as geochemical maps, cumulative frequency diagrams, boxplots and scatterplots, are used to interpret the origin of the patterns for these elements. None of the elements reported here are emitted in significant amounts from the smelting industry on the Kola Peninsula. Despite the conventional view that moss chemistry reflects atmospheric element input, the nature of the underlying mineral substrate (regolith or bedrock) is found to have a considerable influence on moss composition for several elements. This influence of the chemistry of the mineral substrate can take place in a variety of ways. (1) It can be completely natural, reflecting the ability of higher plants to take up elements from deep soil horizons and shed them with litterfall onto the surface. (2) It can result from naturally increased soil dust input where vegetation is scarce due to harsh climatic conditions for instance. Alternatively, substrate influence can be enhanced by human activity, such as open-cast mining, creation of ‘technogenic deserts’, or handling, transport and storage of ore and ore products, all of which magnify the natural elemental flux from bedrock to ground vegetation. Seaspray is another natural process affecting moss composition in the area (Mg, Na), and this is most visible in the Norwegian part of the study area. Presence or absence of some plant species, e.g., lichens, seems to influence moss chemistry. This is shown by the low concentrations of B or K in moss on the Finnish and Norwegian side of the (fenced) border with Russia, contrasting with high concentrations on the other side (intensive reindeer husbandry west of the border has selectively depleted the lichen population). 相似文献
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S. M. Moosavirad J. Rasouli M. R. Janardhana M. R. Moghadam M. Shankara 《Arabian Journal of Geosciences》2013,6(10):3623-3634
This paper discusses the result of the detailed investigations carried out on the coal characteristics, including coal petrography and its geochemistry of the Pabedana region. A total of 16 samples were collected from four coal seams d2, d4, d5, and d6 of the Pabedana underground mine which is located in the central part of the Central-East Iranian Microcontinent. These samples were reduced to four samples through composite sampling of each seam and were analyzed for their petrographic, mineralogical, and geochemical compositions. Proximate analysis data of the Pabedana coals indicate no major variations in the moisture, ash, volatile matter, and fixed carbon contents in the coals of different seams. Based on sulfur content, the Pabedana coals may be classified as low-sulfur coals. The low-sulfur contents in the Pabedana coal and relatively low proportion of pyritic sulfur suggest a possible fresh water environment during the deposition of the peat of the Pabedana coal. X-ray diffraction and petrographic analyses indicate the presence of pyrite in coal samples. The Pabedana coals have been classified as a high volatile, bituminous coal in accordance with the vitrinite reflectance values (58.75–74.32 %) and other rank parameters (carbon, calorific value, and volatile matter content). The maceral analysis and reflectance study suggest that the coals in all the four seams are of good quality with low maceral matter association. Mineralogical investigations indicate that the inorganic fraction in the Pabedana coal samples is dominated by carbonates; thus, constituting the major inorganic fraction of the coal samples. Illite, kaolinite, muscovite, quartz, feldspar, apatite, and hematite occur as minor or trace phases. The variation in major elements content is relatively narrow between different coal seams. Elements Sc,, Zr, Ga, Ge, La, As, W, Ce, Sb, Nb, Th, Pb, Se, Tl, Bi, Hg, Re, Li, Zn, Mo, and Ba show varying negative correlation with ash yield. These elements possibly have an organic affinity and may be present as primary biological concentrations either with tissues in living condition and/or through sorption and formation of organometallic compounds. 相似文献
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Mercury,arsenic, antimony,and selenium contents of sediment from the Kuskokwim River,Bethel, Alaska,USA 总被引：1，自引：0，他引：1
The Kuskokwim River at Bethel, Alaska, drains a major mercury-antimony metallogenic province in its upper reaches and tributaries. Bethel (population 4000) is situated on the Kuskokwim floodplain and also draws its water supply from wells located in river-deposited sediment. A boring through overbank and floodplain sediment has provided material to establish a baseline datum for sediment-hosted heavy metals. Mercury (total), arsenic, antimony, and selenium contents were determined; aluminum was also determined and used as normalizing factor. The contents of the heavy metals were relatively constant with depth and do not reflect any potential enrichment from upstream contaminant sources. 相似文献