新疆乌拉根铅锌矿床成因探讨

通过对乌拉根铅锌矿床的地质特征与金顶超大型铅锌矿床特征详细对比研究 ,确认乌拉根铅锌矿床是海底喷流沉积型铅锌矿床 ,指出矿床及其外围具有大型 -超大型规模找矿潜力     

陕西旬阳地区志留系铅锌矿矿集区特征及其成因初探

通过十多年的勘查及研究，在陕西旬阳—白河一带的志留系中新发现了大型铅锌矿矿集区。该矿集区东西长约100km，南北宽10—50km。区内有中志留统双河镇组和下志留统梅子垭组两个含矿层位及泗人沟—南沙沟、红土坡—韩氏沟—小沟、西营—黄石板三个成矿带。在成矿带内已发现20余处铅锌(铜)矿床(点)，资源丰富，找矿潜力较大。该矿床成因为细碎屑岩沉积—改造型铅锌矿床。     

The spatial distribution and source of arsenic, copper, tin and zinc within the surface sediments of the Fal Estuary, Cornwall, UK

ABSTRACT Estuarine sediments commonly form major sinks for contaminants released during industrial activity. Many industrial processes lead to the release of metals initially in solution, which can then be adsorbed on to, for example, Fe hydroxides or clay minerals. However, in the mining industry, there are two major contaminant waste streams: (1) metals discharged in solution via mine drainage; and (2) particulate grains of the ore‐forming or related minerals released after ore processing. The release of particulate waste can have a major long‐term impact on environmental geochemistry. In this study, we have mapped the distribution of arsenic, copper, tin and zinc within the surficial sediments of the Fal Estuary, Cornwall, UK, an area that drains a historically important polymetallic mining district. There are clear spatial variations in the contaminants, with the highest levels (> 2800 p.p.m. As, > 5000 p.p.m. Cu, > 3000 p.p.m. Sn and > 6000 p.p.m. Zn) within Restronguet Creek on the western side of the estuary. Mineralogical studies show that small (< 20 µm) grains of detrital arsenopyrite, chalcopyrite, cassiterite and sphalerite are very abundant within the surface sediments. Most of the sulphide grains are fractured, but mineralogically unaltered, although some grains show alteration rims caused by oxidation of the sulphides. The geochemistry and mineralogy are indicative of sediment supply from the discharge of particulate waste into the estuary during historical mining activity. Subsequently, this particulate waste has been largely physically and biologically reworked within the surface sediments. Although considerable effort has been made to minimize contaminants released via mine drainage into the estuary, the potential flux of contaminants present within the intertidal and subtidal sediments has not been addressed. Benthic invertebrates living within the area have adapted to be metal tolerant, and it is likely that the dominant source of bioavailable metals is a result of alteration of the particulate mine waste present within the intertidal and subtidal sediments.     

硝酸钠-硫氰酸铵-罗丹明B-水液-固体系浮选分离锌

研究了硝酸钠-硫氰酸铵-罗丹明B-水液-固体系浮选分离锌的行为及其与常见离子分离的条件。结果表明，在NaNO3存在下，NH4SCN—RhB—Zn三元缔合物可浮于盐水相上形成界面清晰的液-固两相，从而使Zn^2 被定量浮选，而Cd^2 、Mn^2 、Al^2 、Ni^2 、Co^2 、Fe%2 等离子不被浮选。应用该方法对合成水样及加碘锌强化营养盐中微量锌进行了定量浮选分离测定，样品标准加入回收率为98．3％-101．8％。     

Pinus brutia as a biogeochemical medium to detect iron and zinc in soil analysis, chromite deposits of the area Mersin, Turkey

Soil and pine (Pinus brutia) samples were collected from 64 sites over chromite and ultramafic rocks near Musal?, and over clastic sediments of the Silifke-Anamur areas of Mersin, Turkey. Both sample media were analyzed for their Zn and Fe contents. The results showed similar concentration of both elements in the ash of needles and twigs, with each exhibiting lower concentration than the soils. Zinc was more concentrated in pines from the Silifke-Anamur area than at Musal?, but Fe concentrations were similar in both area. A positive correlation was observed between Zn and Fe in pine and soils (r=0.90 and 0.79, respectively). It is concluded that P. brutia can be used as a biogeochemical sample medium to detect concealed deposits of Zn and Fe.     

豫西南地区铅锌银沉积建造地球化学特征

通过对豫西南地区中元古界官道口群、上元古界栾川群与铅锌银有关的沉积建造中元素含量分布、表生富集特征及综合地球化学异常特征的研究, 认为官道口群、栾川群是铅锌银矿的矿源层, 并指出龙家园组、南泥湖组、煤窑沟组是寻找与官道口群碳酸盐岩和栾川群碎屑岩-碳酸盐岩沉积建造有关的层控铅锌银矿床的有利层位。     

银水垄银铅锌矿地质特征及远景预测

银水垄矿区位于邵阳-郴州深大断裂带与炎陵-长城岭大断裂带的交汇部位，区内NW-NWW向断裂构造经历了从加里东期到燕山期的多次构造变动，为区内主要控矿容矿构造．本区岩浆活动频繁，燕山早期形成的瑶岗仙黑云母花岗岩为具多次侵入活动的酸性-超酸性铝过饱和钙碱系列复式岩株，岩体中富含W、Sn、Pb、Zn、Cu等成矿元素，为矿床的形成提供了丰富的物质来源．在论述矿床地质特征的基础上，进一步阐述了矿床的控矿因素、富集规律及找矿标志，对矿区作出了远景预测．     

Qinling-Type Lead-Zinc Deposits

Qinling-type Pb-Zn deposits are located in the Qinling fold belt, occurring in the fine-clastic and carbonate rocks of the Devonian marine facies. They are reformed sedimentary deposits originating from hydrothermal waters, and may be subdivided into 2 subtypes: hydrothermal sedimentary deposits (Changba subtype) and reformed hydrothermal sedimentary deposits (Bijiashan-Qiandongshan subtype). In comparison with some of the famous Palaeozoic Pb-Zn deposits in the world, the Qinling-type Pb-Zn deposits constitute an independent type, which possesses some characteristics of both hydrothermal sedimentary deposits (Meggen type) and reformed hydrothermal deposits (Mississippi Valley type).     

Thin coating on ultrafine aerosol particles

This article presents the results of an experimental investigation on gas-phase coating of nanometer-sized NaCl aerosol particles with a condensing vapor of ZnCl₂. The coating process has been carried out in a commercially available Venturi aspirator, where the NaCl at ambient temperature is mixed with the supersaturated ZnCl₂ vapor. The operating conditions (ZnC1₂ vapor temperature, and ZnCl₂/NaCl flow rate ratio) at which the ZnCl₂ vapor preferentially nucleates onto the surface of the seed NaCl particles forming a coating layer on them, have been determined. Particle size growth as a function of the original seed diameter has also been determined. Smaller particles undergo a larger relative size growth ratio. It has also been shown that the presence of a coating layer does not affect the charge distribution of the original seed particles.