香格里拉热林铜钼多金属矿含矿岩体及矿化特征

热林复式花岗岩体,总体为从边部到中部由细粒似斑状二长花岗岩、中粒似斑状二长花岗岩和边部补充期花岗斑岩5个侵入体组成的燕山期同源岩浆结构演化系列.属钙碱性系列,弱过铝质的Ⅰ型向S型过渡特征.成矿类型为蚀变花岗岩、石英脉型和角岩型3种,并划分为黄铁矿±黄铜矿—石英脉,黄铁矿—黄铜矿±辉钼矿—石英脉,辉钼矿±黄铜矿—石英脉及黄铜矿—石英—方解石脉4个成矿作用阶段.     

云南迪庆春都铜矿控矿地质条件

铜矿体赋存于印支期浅成-超浅成相的石英二长玢岩体内,具斑岩型矿床的蚀变特征,主要控矿因素为岩浆岩、岩浆侵位的地层、热液蚀变作用和构造裂隙等。是印支期甘孜-理塘洋向西俯冲造山晚期与超浅成斑（玢）岩密切有关的斑岩型铜矿床,矿区及外围具有较大的找矿潜力。     

Behaviour of Fe-oxides relevant to contaminant uptake in the environment

The behaviour of Fe-oxides was investigated during precipitation and co-precipitation, phase transformation and dissolution, while their ability to adsorb and incorporate trace components was examined. Some samples were synthesised and studied under controlled laboratory conditions and other samples were taken from experiments designed to test the effectiveness of waste treatment strategies using iron. Surface-sensitive and high-resolution techniques were used to complement information gathered from classical, macroscopic methods.

Adsorption isotherms for Ni²⁺ uptake on synthetic ferrihydrite (Fe₅HO₈·4H₂O, often written simply Fe(OH)₃), goethite (-FeOOH), hematite (-Fe₂O₃) and magnetite (Fe₃O₄) were all similar, increasing as expected at higher pH. Desorption behaviour was also similar, but one third or more of the Ni²⁺ failed to return to solution. In the past, “irreversible sorption” has been blamed on uptake into micro-fractures or pores, but during examination (using Atomic force microscopy, AFM) of hundreds of Fe-oxide particles, no evidence for such features could be found, leading to the conclusion that Ni²⁺ must become incorporated onto or into the solids. When solutions of Fe(II) are oxidised in controlled laboratory conditions or during treatment of ash from municipal waste incinerators, two-line ferrihydrite forms rapidly and on never-dried samples, AFM shows abundant individual particles with diameter ranging from 0.5 to several tens of nanometers. Aging in solution at 70°C promotes growth of the particles into hematite and goethite and their identification (by X-ray powder diffraction, XRPD, with Rietveld refinement) becomes possible at the same aging stage as mineral morphology becomes recognisable by AFM. In other experiments that were designed to mimic natural attack by organic acids, colloidal lepidocrocite (γ-FeOOH) was observed in situ by AFM, while reductive dissolution removed material on specific crystal faces. Lath ends are eroded fastest while basal planes are more stable.

In order to help elucidate mechanisms of contaminant immobilisation by Fe-oxides, we examined samples from a reactive barrier made with 90% quartz sand, 5% bentonite and 5% zero-valent iron filings that had reacted with a solution typical of leachate from coal-burning fly ash using time-of-flight secondary ion mass spectroscopy (TOF-SIMS). Fe(0) oxidised to Fe(III), while soluble and toxic Cr(VI) was reduced to insoluble Cr(III). Chemical maps show Fe-oxide coatings on bentonite; Cr is associated with Fe-oxides to some extent but its association with Ca in a previously undescribed phase is much stronger. Other samples taken from municipal waste incinerator ash that had been treated by aeration in Fe(II) solutions were examined with transmission electron microscopy (TEM), selected area electron diffraction (SAED) and energy dispersive X-ray spectroscopy (EDS). Pb and some Zn are seen to be dispersed throughout two-line ferrihydrite aggregates, whereas Sn and some Zn are incorporated simply as a result of entrainment of individual ZnSn-oxide crystallites.

Geochemical speciation models that fail to account for contaminant uptake in solid solutions within major phases or as thin coatings or entrained crystals of uncommon phases such as those described here risk to underestimate contaminant retardation or immobilisation.     

腾冲大松坡云英岩型锡矿矿床地质

大松坡锡矿是滇西云英岩型锡矿的典型代表。矿体产于燕山晚期花岗岩体内的次级NNW向构造裂隙带中，呈脉状成群产出。共圈出含锡云英岩脉60余条，但主矿体却只有少数几条。矿体沿走向具有分枝、复合、尖灭再现或尖灭侧现的特点。矿石类型为云英岩型锡矿石。矿床成因属气成高温热液云英岩型锡矿床。根据矿体特征及近年开采实践，对主矿体连接对比标志进行探讨。     

青海都兰沟里金矿整装勘查区1:100 000地质矿产数据集

青海都兰沟里金矿整装勘查区1：100 000地质矿产数据集由系统库、建造构造图、地质矿产图、地磁ΔT平面等值线图、地磁ΔT化极平面等值线图、化探综合异常图、矿产预测成果图及附表组成;每张图文件夹内有对应的编图说明。沟里整装勘查区总体被新元古代-早古生代东昆中缝合带（Pt₃-P₂末）、中-晚古生代兴海-苦海缝合带（D-P₃）、晚古生代-早中生代（C-T₂末）阿尼玛卿缝合带分割为4个二级构造单元。区内岩浆活动以奥陶纪-泥盆纪和二叠纪-三叠纪为主,分别代表了两期不同的造山旋回,成矿期可能在晚三叠世-早侏罗世。此次工作在整装勘查区内共圈定了1：50 000磁异常21处、化探综合异常80处;划分4个三级成矿带（区）、7个四级成矿亚带、8个五级矿带（矿田）、17个六级有利找矿区块;在有利找矿区块中筛选并提交找矿靶区14处;通过后续投入,区内相继发现了那更康切尔大型银矿、德龙金矿、迈龙金矿点、浪木日铜镍矿点、龙什更铜钴矿点等一批有找矿潜力的矿床（点）;估算区内金资源总量588.04吨、银资源总量3 197.85吨、铅-锌资源总量235.83万吨,铜-钴资源总量121.49万吨。     

金平阿德博铜镍矿区王家寨矿段矿床成因探讨

矿床与华力西期超基性一基性一中性岩浆杂岩关系密切,成矿专属性明显。先期矿浆在杂岩体中初步熔离富集,后期矿浆在压力作用下沿断裂贯入,经期后热液改造再富集成矿。     

中甸雪鸡坪斑岩铜矿地质及找矿远景

雪鸡坪斑岩铜矿含矿母岩为印支期浅成相同熔型石英二长闪长玢岩、石英闪长玢岩、石英二长斑岩组成的复式岩株。发育面型蚀变带,经历气成一高温热液、中低温热液及低温热液三次矿液叠加成矿。在钾化带及石英一绢云母化带发育浸染状及网脉状铜矿化。认为普朗及其南部、地苏嘎是区内形成大型斑岩铜矿最有希望地区。     

莫桑比克阿尔特里哥纳伟晶岩区概貌

莫桑比克阿尔特里哥纳是世界著名的伟晶岩区之一,蕴藏着丰富的稀有金属、稀土、水晶和宝石等矿产资源。伟晶岩脉及其矿体的分布受北北东—北东向和北西向断裂控制,北北东—北东向分布的伟晶岩矿床以稀有金属矿种为主,北西向分布的伟晶岩矿床以稀土金属矿种为主。伟晶岩体及其矿体呈脉状和透镜状等,规模大,富含钽铁矿、铌铁矿、锂云母、锂辉石、绿柱石、独居石、铌钇矿、烧绿石和泡铋矿等矿物。伟晶岩年龄410M a~560M a,是泛非构造运动的产物。按岩浆凝固浓度等分类,伟晶岩类型为稀有金属伟晶岩,部分为浅成、晶洞状伟晶岩;按化学成分等分类,伟晶岩以钠锂型为主,部分为钾型。伟晶岩体有明显的结构分带。