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川西甘孜-理塘结合带嘎拉金矿床同位素特征及成矿作用研究 总被引：2，自引：1，他引：1
嘎拉金矿床位于甘孜-理塘结合带北段,矿区内韧性剪切变形特征明显,主要赋矿地层为上三叠统曲嘎寺组蛇绿混杂岩,控矿构造以北西向断裂为主.论文对与成矿有关的热液石英及其中的流体包裹体、各类硫化物进行了H-O-C-S-Pb同位素分析,测试显示石英δ18OQ的值介于15.60‰ ～ 18.38‰之间,流体的δ18 OH2o值介于8.24‰ ～9.89‰,而δDH2o值为-121.342‰ ～-126.368‰;流体包裹体中CO2的δ13C值介于-11.3‰～-2.1‰之间;各类矿石硫化物δ34S值介于-9.2‰～-4.9‰,峰值集中在-7‰～-5‰;铅同位素显示铀铅富集的特征.同位素研究表明成矿热液来源于变质水,并有大气降水的参与;金等成矿物质主要来自于围岩地层.年代学数据表明嘎拉金矿床形成于燕山晚期,是在义敦岛弧碰撞造山过程中由挤压作用体制转变为伸展作用体制的构造背景下形成的造山型金矿床. 相似文献
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麦兹火山-沉积盆地内铅锌矿呈似层状、透镜状,矿石构造以条纹条带状、块状、斑杂状为主,矿物成分相对简单,矿体直接容矿围岩为火山-沉积岩.矿床δ34S值为-20.6‰～-10‰;矿床石英流体包裹体水的δD值为-89.1‰～-49.48‰,δ18OSMOW值为4.7‰～1.2‰.矿化层中方解石的δ13C值介于-6.7‰～-14.3‰之间,δ18O值在10.3‰～12.9‰之间.矿床属火山-沉积岩容矿的块状硫化物矿床,介于典型的火山岩容矿的块状硫化物型矿床(VHMS)和典型沉积岩容矿的硫化物矿床(SEDEX型)之间的过渡类型(一种新类型块状硫化物矿床). 相似文献
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吉尔吉斯斯坦北天山构造带的矿床学数据缺乏,制约了天山造山带境内外成矿对比。布丘克金矿床位于吉尔吉斯斯坦北天山构造带中部。金矿体为石英复脉,呈带状发育于NWW向韧性剪切带中。矿体倾向SSW,倾角60°～70°,赋矿围岩主要为侵入于早古生代变质碎屑杂岩中的正长斑岩。布丘克金矿床成矿期石英流体包裹体观察、石英H-O同位素、硫化物S同位素测试结果显示,布丘克金矿床石英脉中包裹体大小集中在2～10μm之间,类型以H2O-CO2型、富CO2型、水溶液型包裹体为主,成分以富CO2、含CH4为特征。成矿流体具有中温(200～320℃)、低盐度(3%～7%NaCleqv)特征;石英δDV-SMOW值介于-108.1‰～-90.2‰之间,δ18O流体值介于4.86‰～9.26‰之间;黄铁矿δ34S分布在0‰左右(-0.9‰～1.6‰)。综合本文数据、矿床地质特征、区域地质资料,本文认为布丘... 相似文献
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云南武定迤纳厂铁-铜-金-稀土矿床成矿物质来源——来自矿床地质与S、Pb、H、O同位素的制约 总被引：1，自引：0，他引：1
武定迤纳厂铁铜金稀土矿位于我国云南省中部,扬子板块西缘,康滇地轴云南段。根据矿物组合、围岩蚀变和矿化特征等方面的差异,可将其蚀变矿物组合划分为铁稀土长石硅酸盐组合和铜金石英碳酸盐组合两类,前者发生在矿化中前期,后者发生于矿化后期。铁铜稀土长石硅酸盐组合又可划分为磁铁矿钠长石稀土组合和黄铜矿钾长石石榴子石黑云母组合。分别对黄铜矿钾长石石榴子石黑云母组合中的黄铜矿、萤石,铜金石英碳酸盐组合中的黄铜矿、萤石、石英、方解石开展了S、Pb、H、O同位素的示踪研究。两组黄铜矿的δ34SCDT(‰)值变化范围为-0.44‰~+4.07‰,集中于0值附近,说明其具有单一岩浆来源。后一组黄铜矿单矿物的δ34SCDT(‰)值稍高于前一组合。第一组黄铜矿的Pb同位素组成较为均一,206Pb/204Pb比值范围为37.684~51.112,207Pb/204Pb比值范围为16.939~17.875,208Pb/204Pb比值范围为40.116~41.984,表明其来源单一;而第二组黄铜矿的Pb同位素组成则相对分散且具线性趋势,206Pb/204Pb比值范围为19.523~356.740,207Pb/204Pb比值范围为15.853~41.182,208Pb/204Pb比值范围为39.411~42.010,表明其为混合来源。前一组合中的萤石单矿物δ18OV-SMOW值介于+9.30‰~+10.80‰之间,δDV-SMOW值介于-63.20‰~-80.20‰之间,表明其更具岩浆水性质;后一组合中的石英单矿物δ18OV-SMOW值介于+15.20‰~+18.10‰之间,δDV-SMOW值介于-47.70‰~-91.20‰之间;方解石单矿物δ18OV-SMOW值介于+17.00‰~+19.60‰之间,δDV-SMOW值介于-66.10‰~-98.20‰之间,表明其更具有变质水的特征。 相似文献
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位于中国南天山的西天山高压变质带代表了伊犁-中天山与塔里木两个板块间古生代南天山洋的古俯冲混杂岩带.高压变质带内广泛发育高压脉.为探讨古俯冲深部流体来源及运移特点及板块俯冲特征,对高压脉和主岩的全岩及主要的高压变质矿物的氧同位素进行了分析.高压脉的δ18O值变化于+8.28‰与+10.70‰之间,多数在+9.50‰±1范围内.基性变质岩的主岩与高压脉具相似的氧同位素组成,变化于+9.25‰～+10.10‰之间.高压脉和主岩的全岩δ18O值变化不大.高压脉与相邻主岩间、同一高压脉中间与边部间氧同位素组成的变化没有明显的规律,一般变化不大,对于大多数脉-主岩对,变化小于1‰.与全岩完全不同的是,单矿物氧同位素组成显示出很大的变化范围,石英、石榴石、绿辉石的δ18O值分别为+11.40‰～+15.20‰,+3.59‰～+11.60‰和+8.30‰～+13.05‰,多硅白云母和蓝闪石δ18O的变化较小,分别为+10.00‰～+11.10‰和+9.26‰～+9.94‰.榴辉质岩石中高压变质矿物间氧同位素分馏广泛不平衡.全岩氧同位素组成特征表明,俯冲带深部流体主体来自邻近主岩,外来流体对氧同位素贡献有限.单矿物氧同位素广泛不平衡特征可能指示古俯冲带俯冲板片的快速俯冲和折返以及部分外来流体的参与. 相似文献
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大湖塘石门寺钨矿床碳、氧、硫同位素研究 总被引：1，自引：0，他引：1
石门寺钨矿是大湖塘钨矿床的北矿段,位于我国下扬子成矿省之江南隆起东段成矿带西部,钦杭结合带的北侧。针对此细脉浸染型钨矿体中金属硫化物中的硫同位素和方解石中的碳、氧同位素进行了测定,结果显示细脉浸染型矿体中黄铜矿样品的δ34S值介于-2.6‰~-0.3‰之间,平均值为-1.31‰;辉钼矿样品的δ34S值介于-1.2‰~0.3‰之间,平均值为-0.53‰。矿体的硫主要来至深部岩浆或者上地幔。方解石δ13 CV-PDB值介于-11.42‰~-5.76‰之间,平均值为-7.06‰;δ18 OV-SMOW的变化范围为7.13‰~16.34‰,平均值为11.79‰,说明成矿流体中的碳主要来源于深部岩浆或者上地幔,并受到有机碳的混合。大湖塘石门寺钨矿段的成矿物质主要来源于大湖塘燕山期S型花岗岩岩浆,但不排除成矿流体在上升的过程中萃取了一部分围岩的成矿物质。 相似文献
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河南省新县大银尖钼矿床同位素地球化学研究 总被引：2，自引：0，他引：2
在详细的野外地质工作基础上,本文测定了河南省新县大银尖钼矿床的矿石硫、铅同位素,含矿石英脉中石英的氧同位素、石英中包裹体的氢同位素组成,以及辉钼矿的铼含量,参照前人的研究成果,探讨大银尖钼矿床成矿物质来源和形成机制.矿石硫同位素δ34SV-CDT介于3.90‰～ 10.70‰之间,均值为7.44‰.矿石铅同位素n(206Pb) /n(204Pb)介于17.0411～17.3188之间,均值为17.1388;n(207pb)/n(204Pb)介于15.3968～ 15.4166之间,均值为15.4041;n(208Pb)/n(204Pb)介于37.7322 ～38.2360之间,均值为37.9100.含矿石英脉中石英的δ18 OSMOW值在11.20‰～13.20‰之间,均值为11.90‰;石英中包裹体的δDSMOW介于-79.00‰ ～-76.90‰之间,均值为-78.28‰;利用流体包裹体均一温度的平均值和Clayton平衡分馏方程计算与石英平衡共存流体的δ18OH2O,SMOw介于-0.26‰～3.70‰之间,均值为1.82‰.辉钼矿中的Re含量介于8.28×10-6～54.74×10-6之间.矿石硫同位素组成研究表明成矿物质与岩浆作用有关,但混有地壳物质.铅同位素组成和辉钼矿的铼含量研究表明,大银尖钼矿床的成矿物质主要来自地壳.含矿石英脉的氢和氧同位素组成研究显示,氧同位素飘离岩浆水范围,表明成矿流体早期为岩浆水,晚期混入大气降水,也进一步证实混合作用是大银尖钼矿形成的一种重要机制. 相似文献
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对广西高龙微细浸染型金矿床矿石和脉石矿物进行硫、铅、氢、氧同位素测定,获得沉积岩中黄铁矿的δ34S为-15.3‰～+13.6‰,含矿层中的黄铁矿δ34S值为+0.4‰～+15.6‰,硅质岩中黄铁矿的δ34S为+1.7‰～+9.7‰,硅质岩中辉锑矿的δ34S值为-15.3‰～+0.1‰.从含矿层到硅质岩的黄铁矿,再到硅质岩的辉锑矿,硫同位素组成有降低趋势.黄铁矿的206Pb/204Pb值为8.270～18.470;207Pb/204Pb值为5.620～15.710;208Pb/204Pb值为8.310～38.740.矿床石英的氧同位素为+11.3‰～+23.9‰,水的氧同位素为-4.2‰～+14.4‰,矿物包裹体的氢同位素为-53.4‰～-77.1‰,方解石的氧同位素为+10.5‰～+18.6‰,换算成水中氧同位素为-3.2‰～+10.7‰,氢同位素为-54.5‰～-30.5‰,表明热液可能来源于岩浆热液与大气降水和海水混合. 相似文献
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笔者对大宝山多金属矿床矿石和脉石矿物进行铅、硫、氢和氧同位素组成测定,获得硫化物的206Pb/204Pb值为17.930～18.785;207Pb/204Pb值为15.491～15.772;208Pb/204Pb值为37.990～40.990,并组成良好的线性关系。泥盆系地层中黄铁矿的δ34S为-22.5‰～+17.9‰,矿床硫化物的δ34S为-2.4‰～+4.6‰。黄铁矿、闪锌矿和方铅矿共生矿物对,具有δ34Spy>δ34Ssp>δ34Sgn,用磁黄铁矿的硫同位素组成估算出δ34S∑S为2‰±3‰。硫化物包裹体的氢同位素在-101‰～-123‰之间,与硫化物共生石英的氧同位素为+9.3‰～+17.9‰,换算成水的氧同位素为+0.3‰～+3.9‰,表明成矿热液来源较为复杂。 相似文献
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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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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
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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
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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. 相似文献
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Alexander E. C. Broberg J. S. Kehren A. R. Graziani M. M. Turri W. L. 《Environmental Geology》1993,22(4):353-361
Bellechester, Minnesota, is a small community of approximately 155 residents located on the county line between Goodhue and Wabasha counties in southeast Minnesota's karst region. Bellechester is served by a 21-year-old wastewater treatment facility (WWTF) consisting of three waste-stabilization ponds. On 28 April 1992 six sinkholes were discovered to have drained cell 2 of the WWTF resulting in the loss of approximately 8.7×106 1 of partially treated effluent and about 600 m3 of soil into previously undetected subsurface voids of unknown dimensions. In the week following the collapse, approximately 200 water wells located within a 5-km radius of the WWTF were sampled in an after-the-fact, emergency sampling program. Twelve samples with elevated fecal coliform levels, 18 samples with nitrate-nitrogen greater than the 10 mg/1 standard, and no samples with elevated chlorides were found. However, the elevated levels could not be unambiguously attributed to the WWTF collapse. This is the third WWTF to fail by sinkhole collapse in southeast Minnesota since 1974. All three collapsed lagoons have been located in similar geomorphic and stratigraphic settings. However, at least two lagoons have collapsed in the adjacent area in northeast Iowa, and these lagoons are located at different stratigraphic positions. Twenty-two WWTFs constructed in southeast Minnesota's karst region in the last 25 years have been identified as subject to potential sinkhole collapse. An unknown but significant number of manure storage lagoons, flood control structures, etc., have also been constructed in the karst region and are at risk. Public agencies are beginning to develop plans to deal with the risk associated with existing and future waste lagoons in this environment. The critical hydrogeologic parameters that can be used to prioritize the risk of collapse at existing facilities include: (1) the lithology of the first bedrock beneath each lagoon, (2) the thickness of surficial materials between the lagoon and the bedrock surface, (3) the presence and construction of liners (seepage rate), and (4) the proximity to existing sinkholes. 相似文献
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岩石密度和超高压岩石折返速率 总被引：1，自引：3，他引：1
在常温常压条件下对中国大陆科学钻CCSD主孔100-3000米岩心样品进行了密度测量,建立了密度连续剖面,并界定了不同超高压岩石的密度值。通过对比高温高压物性实验资料,岩石密度随着退变程度增强而降低,榴辉岩密度变化序列为3.52g/cm3→3.49g/cm3→3.07g/cm3→2.93g/cm3。超高压长英质岩石密度变化序列为3.00g/cm→2.80g/cm3→2.65g/cm3。上述实验资料是讨论不同折返阶段岩石所受浮力的基础,为研究折返速率大小提供了基本参数。本文通过折返板块运动平衡时,上浮力与粘滞力平衡这一关系式,定量研究了大陆俯冲板块的折返速率,认为密度差产生上浮力从而引起折返,温度对板块折返速率的影响最为显著;密度差大小、折返角度、折返板块大小对折返速率也有直接的影响。定量模拟分析表明,在温度高于850℃时,板块的折返速率可以超过100mm/a;当温度降至700℃时,折返速率则低于1.5mm/a。作者认为在折返早期,温度较高,板块快速折返至60-70km榴辉岩相深度;随着传导散热,温度降低,板块以较慢的速率折返至中下地壳。折返速率的估算表明,浮力是板块折返第一阶段(从>100km深部折返至<40km的中下地壳)的主要驱动力。 相似文献
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滇东南锡、银、铅、锌多金属矿床主要分布在个旧、白牛厂、都龙3个矿区,而滇东南较大的3个花岗岩体又分别出露在3个矿区或附近.花岗岩体均形成于燕山晚期,岩石化学、矿物成分相似,富含锡、银、铅、锌、钨、铜等成矿元素.矿床主金属元素组合与岩体之间的距离由远而近出现由锡、钨、(铍、铌、钽)→锡、钨、(铁)、铜、铟→锡、铅、锌、银、铟、(锑)有规律的变化.花岗岩浆是成矿物质来源和成矿热源.岩浆侵入初期使上覆地层隆起产生背斜(凹陷部位成向斜);同时使地层产生一系列裂隙、压性断层或层间断裂;岩浆侵入晚期,这些断层再次活动,表现为张性,岩浆产生的含矿热液沿由其活动所造成的断裂迁移、充填、交代、沉淀而形成矿床. 相似文献