胶莱盆地龙口-土堆金矿床成因：微量元素特征与C-H-O-S同位素约束

龙口-土堆金矿大地构造位于胶莱盆地东北缘,胶-辽-吉构造带南段,华北克拉通东南缘,成矿地质条件优越.研究区虽经多年的勘探开采,但其成矿流体和成矿物质来源研究薄弱且存在较大争议,严重制约了成矿机理研究和进一步勘探工作.文章从与成矿密切相关的方解石脉和其他矿物的微量元素与C-H-O-S同位素地球化学特征入手,探讨了龙口-土堆金矿床流体地球化学特征和矿床成因.微量元素分析表明,不同类型方解石具有明显不同的Fe、Mn含量,其中主成矿期含矿方解石具有最高的w(Fe+Mn)(114070×10-6),荆山群大理岩w(Fe+Mn)最低(3971×10-6),而不含矿的方解石的w(Fe+Mn)(5410×10-6)介于前两者之间.不含矿方解石样品δ13CPDB值在?6.90‰～?0.19‰之间,δ18OSMOW值在5.38‰～12.15‰之间;含矿方解石样品δ13CPDB值在?8.56‰～?6.41‰之间,δ18OSMOW值在8.66‰～10.61‰ 之间;荆山群大理岩样品 δ13CPDB值在?3.83‰～?6.73‰ 之间,δ18OSMOW值在14.39‰～16.28‰之间.研究表明:方解石的C-O同位素组成指示含矿碳酸盐脉形成于花岗岩和地幔多相体系;不含矿碳酸盐形成于火成碳酸岩和地幔多相体系;含矿方解石形成于地幔多相体系.石英和方解石流体包裹体氢氧同位素分别为δDwater=?51.5‰～?119.9‰和δ18Owater=0.6‰～7.81‰,表明成矿流体主要为岩浆水,同时可能存在大气降水和地层建造水的参与.矿石硫化物的δ34S值介于8.5‰～12.7‰之间,硫同位素组成呈明显的正态分布,以富集34S为特征,显示了岩浆硫和壳源硫混合的同位素组成特征.结合区域成矿地球动力学背景,文章认为龙口-土堆金矿床为岩浆热液有关的构造蚀变岩型金矿,其流体来源于壳幔混源的多相体系.综合成矿条件分析,文章完善了胶东金矿成矿模式,指出矿区中碳酸盐脉富Fe+Mn的地球化学特征可能指示围岩含矿或近矿.该研究成果可为胶东金矿床的深部及外围找矿勘查提供新的科学依据.     

江苏观山高硫型铜铅金矿床稳定同位素地球化学和成因意义

江苏观山铜铅金矿是典型的高硫型浅成低温热液矿床。本文通过对观山铜铅金矿床氢、氧、碳、硫同位素组成的研究,探讨成矿溶液中水、碳、硫的来源以及成矿溶液的演化。同位素测定显示石英流体包裹体水的δD=-90‰～-70‰,δ18O水=-8.9‰～-1.1‰;热液方解石流体包裹体水的δD=-90‰～-81‰,δ18O水=0.1‰～2.3‰。氢氧同位素组成说明成矿流体主要为与围岩进行过水岩反应的循环大气降水,不排除有少量岩浆水的加入。黄铁矿与黄铜矿矿石的δ34SV-CDT=5.8‰～9.9‰,平均值为7.6‰,表明该矿成矿过程中的S很可能是沉积岩来源的硫与岩浆岩来源硫的混合。矿床中可见较多的重晶石等硫酸盐矿物,这种高价态硫的矿物的存在显示其成矿溶液具有富集34S的特征,加上成矿过程中流体的沸腾导致H2S等气体大量逸出和残余岩浆流体富集34S,使得沉淀的黄铁矿、黄铜矿等硫化物同样具有富集34S的特征;热液方解石碳同位素δ13C方解石=-4.1‰～6.1‰,平均为δ13C方解石=1.3‰,显示其中的C主要来源于流体对流循环过程中对基底岩石中碳酸盐地层的溶解。     

湘中锡矿山超大型锑矿床的碳、氧同位素体系

本文系统地研究了锡矿山锑矿床的围岩、蚀变围岩和热液成因方解石的碳、氧同位素组成。研究表明，相对于区域地层，矿区灰岩明显亏损^18O；围岩蚀变过程中，围岩的δ^18O值趋于减小并有明显的空间变化趋势。不同期次方解石的碳、氧同位素特征明显不同：成矿早期显示出深特征；成矿晚期方解石的碳、氧同位素组成呈正相关，为水－岩反应和温度降低耦合作用所致；成矿期后方解石的碳、氧同位素组成呈明显的负相关，这种方解石的沉淀介质成成矿流体明显不同。水－岩反应的理论模拟显示，成矿流体不可能为未经深部循环的大气降水；成矿流体中的可溶性碳以H2CO3为主；早期成矿流体的δ^13C、δ^18O分别为－6‰、＋10‰，晚期成矿流体的δ^13C、δ^18O分别为0‰、4‰。     

湖南柿竹园矿田柴山铅锌矿床的C、O同位素组成及其研究意义

研究了柿竹园矿田柴山铅锌矿床早、晚期方解石的C、O同位素组成,并对C、O同位素组成之间明显的正相关关系进行了CO2去气、流体混合与水．岩反应的理论模拟。结果表明,该矿床方解石的形成主要是由成矿流体与围岩发生水-岩反应及温度降低造成的,另外大气降水的加入也起到一定的作用。成矿流体中的可溶性碳以H2CO3为主,早期成矿流体的δ^13C、δ^18O值分别为-2．5‰＋4‰,晚期成矿流体的δ^13C、δ^18O值分别为-1‰和＋6‰,并且在成矿过程中一直有中生代大气降水的加入。     

胶东大尹格庄金矿床成矿流体特征与演化

胶东是我国最重要的黄金产地,也是全球成矿晚于赋矿围岩近2Ga的巨型金矿集区之一。大尹格庄金矿床位于胶西北招平断裂中段是区域内典型的超大型蚀变岩型金矿床也是胶东金矿集区内最大的金银伴生矿床。本研究在详实的野外地质调查和岩相学观察基础上对不同成矿阶段的石英中流体包裹体进行碳、氢、氧同位素测试和计算。大尹格庄金矿床热液成矿过程可分为四个阶段:黄铁矿-绢云母-石英阶段(Ⅰ阶段)、石英-黄铁矿阶段(Ⅰ阶段)、石英-多金属硫化物阶段(Ⅲ阶段)和石英-方解石-黄铁矿阶段(Ⅳ)。氢-氧同位素组成表明,Ⅰ阶段流体的δD为-84.4‰～-68.4‰,δ~(18)O为2.04‰～7.36‰;Ⅱ阶段流体的δD为-78.6‰～-69.8‰,δ~(18)O为0.3‰～4.2‰;Ⅲ阶段流体的δD为-81.4‰～-72.0‰,δ~(18)O为-3.47‰～-1.25‰。随着成矿作用进行,δ~(18)O逐渐降低。流体包裹体的碳-氧同位素分析表明,δ~(13)C和δ~(18)O分别随成矿作用的进行降低和升高。两种测试获得的氧同位素变化趋势不同,可能是由于前者是通过石英单矿物氧同位素计算得到的流体包裹体中水的氧同位素而后者测定的是流体包裹体中CO_2的氧同位素。综合分析表明,大尹格庄金矿床成矿流体主体为变质水;成矿作用过程中,断裂带强烈构造变形诱发次生包裹体的形成导致氢氧同位素组成向中生代大气水漂移。     

云南澜沧老厂大型银多金属矿床碳、氧同位素组成及其意义

文章系统研究了老厂矿床的碳酸盐围岩和成矿方解石的碳、氧同位素组成.研究表明,相对于区域地层,矿区碳酸盐岩围岩普遍亏损18O;成矿方解石的碳氧同位素总体上具有明显的正相关性,这些特征表明成矿流体与围岩发生了大规模的水岩反应.文章初步建立了水岩反应的理想模式,根据该模式进一步将成矿方解石划分为矿体中心相和边缘相2组.水岩反应理论模拟表明:总体上成矿流体中的可溶性碳以H2CO3为主,中心相成矿流体的δ13C、δ18O值分别为-5.5‰和+4‰,具有典型深部岩浆流体的特征;边缘相成矿流体的δ13C、δ18O值分别为-1.5‰和+4‰,代表了深部岩浆流体与下渗天水共同交代碳酸盐岩围岩后的碳、氧同位素特征.     

黔西南泥堡—包谷地卡林型金矿田热液矿物地球化学特征及其地质意义

黔西南泥堡—包谷地卡林型金矿田以泥堡特大型金矿床为主体,兼具一系列小型金矿床和新发现金矿点。本文在矿田内系统采集了与成矿密切相关的石英、方解石、萤石和辉锑矿样品,分析微量元素和稳定同位素地球化学特征,探讨成矿流体性质及来源。分析结果显示,石英、方解石和萤石整体上富集As、Sb、Li、Sr、W等元素,其中As、Sb成矿元素继承了成矿流体的特征;Sb成矿元素与Bi、W、Mo、Co、Ni等亲岩浆元素相关性较好,显示成矿与岩浆活动有关。方解石、萤石显示MREE富集,方解石具有显著的Eu正异常,反映了成矿流体在矿物沉淀时的稀土配分特征,并且处于相对酸性和还原的状态。石英δDV-SMOW、δ18OV-SMOW和δ13CV-PDB分别为-76‰~-55.7‰（均值-64.9‰）、16.5‰~24.5‰（均值21.1‰）、-14.3‰~-7.0‰（均值-10.9‰）,辉锑矿δ34SV-CDT值为-0.4‰、-0.6‰和1.9‰,方解石δ13CV-PDB和δ18OV-SMOW分别为-6.5‰~-2.5‰（均值-4.5‰）、16.2‰~22.4‰（均值18.7‰）。综合研究区内分析和收集的C、H、O和S同位素结果,表明成矿流体可能主要来源于岩浆流体,并有部分地层水加入。结合区域地球物理和年代学资料,认为黔西南卡林型金矿成矿可能与深部岩浆活动有关,而与区域上出露的基性—超基性岩浆岩没有直接的成因联系。     

若尔盖铀矿田碳氧同位素特征及其成因

研究了若尔盖铀矿田中灰岩、硅灰岩及方解石脉的碳氧同位素组成,结果表明产于地层中的灰岩、硅灰岩及方解石脉的δ13C值为-1.48‰～3.18‰,平均为1.51‰,为海洋沉积碳酸盐岩的碳同位素组成特征;δ18O值为-12.81‰～-3.71‰,平均为-9.92‰,在铀矿田中δ18O值最高.与成矿作用关系最为密切的含矿方解石脉δ13C值为-2.78‰～-4.81‰,平均为-3.93‰,明显表现为地幔来源的特点;δ18O值为-13.14‰～-15.05‰,平均为-13.87‰,其值在铀矿田中介于地层中岩石(脉)与矿区方解石脉之间.矿区方解石脉的δ13C值为-3.53‰～-6.35‰,平均为-4.93‰,与含矿方解石脉的碳同位素组成相近,表明其亦是成矿作用的产物;δ18O值为-16.00‰～-24.75‰,平均为-19.36‰,在铀矿田中δ18O值最低,明显表现为深部来源特征.综合若尔盖铀矿田的碳氧同位素组成特征,暗示其成矿流体应当来源于地幔.     

云南会泽超大型铅锌矿床C、O同位素地球化学

云南会泽超大型铅锌矿床规模大、品位富、伴生有用元素多,预示其成矿环境较为特殊。本文分析该矿床矿石中脉石矿物方解石和赋矿碳酸盐地层的C、O同位素组成,结果表明矿石中脉石矿物方解石的C、O同位素组成相对均一,不同矿体(不同标高)、不同产状以及相同矿体不同产状方解石的C、O同位素组成不具明显差别,其δ13CPDB值和δ18OSMOW值分别为-2.1‰～-3.5‰(均值-2.8‰)和16.7‰～18.6‰(均值17.7‰),在δ13CPDB-δ18OSMOW图上集中于岩浆碳酸岩与海相碳酸盐岩之间的狭小范围内。多方面的证据表明:矿床成矿流体为壳-幔混合流体,其中壳源组分可能主要由矿区(或区域)碳酸盐地层提供,而幔源组分则可能与区域大面积峨眉山玄武岩岩浆活动过程中的去气作用有关。     

长岭断陷火山岩储层内碳酸盐矿物碳氧同位素组成及其成因

碳酸盐矿物是火山岩储层内重要的矿物成分,长岭断陷火山岩储层内的自生碳酸盐矿物主要是方解石.本文通过对营城组储层内方解石矿物的碳氧同位素特征分析,探讨储层内碳酸盐矿物成因.研究表明,长岭断陷火山岩储层内方解石δ13 CV-PDB值范围为-12.7‰～0.4‰,δ18OV-SMOw值范围为3.8‰～12‰,具有高δ18O值.与方解石平衡的CO2碳同位素计算值范围较宽,为-16.0‰～2.2‰,表明其形成物质的多源性.在δ18 O-δ13C图解中显示,形成碳酸盐矿物的CO2来源于幔源-岩浆无机成因的CO2和有机质演化过程中产生的CO2,以无机成因CO2源为主.这些无机成因CO2、有机成因CO2和沉积有机质热演化产生的有机酸溶于流体,形成酸性流体.火山岩储层中碳酸盐矿物的形成实质就是这种酸性流体与储层围岩反应的结果.     

Wavelength-dispersive X-ray fluorescence spectrometric determination of Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in komatiites

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.     

高压微波消解法测定醋酸纤维过滤器采集的微尘粒子中的砷镉钴铬铜铁锰镍铅钒锌

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     

Isotopic systematics of He,Ar, S,Cu, Ni,Re, Os,Pb, U,Sm, Nd,Rb, Sr,Lu, and Hf in the rocks and ores of the Norilsk deposits

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.     

硅酸盐中铁、锰、钛、钙、钾、磷、硅、铝、镁、钠、锶、铷、钡的X-射线荧光光谱定量测定

本文介绍样品经四硼酸锂熔融制成玻璃小饼。采用Lachance模式和理论a系数来校正元素间的效应,由3080E型X-射线荧光谱仪和DF-350B数据处理系统完成硅酸盐中十三个项目的测定。     

硅酸盐类样品中硅、铁、铝、钛、锰、钙、镁、钾、钠和磷的x射线荧光光谱测定

本文拟定了一种以熔融法制备样片,用X射线荧光光谱测定硅酸盐类样品中Si、Fe、Al、Tj、Mn、Ca、Mg、K、Na、P等元素的分析方法。在对不同靶材X光管和分光晶体实验对比的基础上,选择了最佳的测量条件。该法具有快速、准确,测量范围广,检测限低,价格便宜等优点。经过近百个各种类型标样或管理样品的分析对比表明,本法不仅适用于硅酸盐类岩石样品的分析,还适用于铁矿、铝土矿、碳酸盐类岩矿样品以及水泥、耐火材料等样品的分析。     

Viscous, cohesive, non-Newtonian, depositing, radial slurry flow

Mining induced subsidence can significantly affect mining costs where major surface facilities and natural environment need to be protected. Overburden grout injection is a technology used to control coal mine subsidence by injecting the mine waste material extracted from the coal back into the inter-burden rock during longwall mining. The flowing slurry is here categorised as a nonlinear viscous cohesive (Bingham plastic) fluid. During longwall mining the grout slurry is pumped into the separated beds of the rock mass through a central vertical borehole, which is drilled deep into the inter-burden rock strata above the coal seam. However, a blockage can occur in the injection system when the slurry velocity falls below a certain critical threshold velocity, indicating a material phase change from cohesive-viscous to cohesive-frictional. In situ field injection tests through boreholes have been simulated at a smaller scale at the CSIRO laboratory in Brisbane by pumping the slurry through a radial disk (gap = 4 mm) from its centre. Laboratory experiments indicate a general, nonlinear, cohesive, viscous, frictional model for shear behaviour of the slurry, in which the material shear parameters are functions of the disk radial distance. Complete dimensional and dimensionless analytical solutions have been developed based on an approach related to Bingham–Herschel–Bulkley fluid mechanics. The derived formulae include relations for minimum pump pressure, local pressure and pressure gradient, wall shear stress, volume rate, velocity and velocity gradient. The theoretical results match the experimental measurements. The experiments covered slurries with maximum particle sizes of 0.5 to 2 mm with about 50% being larger than 100 µm. The viscosities at the various solids concentrations were measured with a standard torsion viscometer. This study differs from the previous research in several distinct aspects, namely, consideration of the variable shear parameters rather than fixed values, inclusion of total nonlinear behaviour, and implementation of a friction function to mimic behaviour of the deposited and consolidating stiff slurry, which can cause a significant pressure rise as a result of the increased shear resistance.     

Mountains,nations, parks,and conservation

Between 1985 and 1991, two new mountain protected areas (MTNPA) covering more than 35,000 km² and based on participatory management models — the Makalu-Barun National Park and Conservation Area, Nepal, and Qomolangma Nature Preserve, Tibet Autonomous Region — were successfully established through the collaborative efforts of Woodlands Mountain Institute and conservationists in China and Nepal. Characteristics common to both projects include the importance of establishing (1) effective rationales, (2) local support constituencies, (3) a senior advisory group, (4) a task force, (5) linkages between conservation and development, and (6) fund raising mechanisms. The lessons derived from the experiences of Woodlands Mountain Institute are of significant value to others in preserving MTNPA. Increased collaboration and communication between all interested in conservation, however, will remain a critical component for expanding mountain protected area coverage to throughout the world.     

Regional distribution of Al,B, Ba,Ca, K,La, Mg,Mn, Na,P, Rb,Si, Sr,Th, U and Y in terrestrial moss within a 188,000 km2 area of the central Barents region: influence of geology,seaspray and human activity

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).     

NEW SET OF LOW CONCENTRATION STANDARDS FOR LA, CE, SM, YB, LU, Y, SC, V, NB AND TA IN SILICATES

We have developed a set of four synthetic standards for the rare earth and high field strength elements designed for use in the determination of those elements in silicates. The base material is a glass nominally at the eutectic of the MgO-Al₂O₃-SiO₂ ternary system. The nominal doping level was 2 wt% of the elements as oxides. To avoid problems associated with peak interference, the elements were doped in four separate glasses.