承钢高炉炉缸高铝高钛沉积物的物化性能

采用电子探针仪测定了承钢高炉炉缸高铝高钛沉积物的化学组成,利用显微镜对其进行矿相分析,并用扫描电镜观察该沉积物中主要元素的分布形态。研究结果可为进一步分析承钢高炉炉缸沉积物形成机理奠定基础。     

Densification of iron(III) sludge in neutralization

Acid mine drainage (AMD), of which iron is a substantial component, is a potential by-product in the mining industry. Conventional neutralization is a common approach to treat AMD, although it creates a major disposal problem due to the generation of voluminous sludge. Sludge recirculation improves solid density by slowing down the rate of neutralization and allowing the growth of precipitates, while existing solids act as seed particles by providing necessary surface area for precipitation. The mechanisms of iron sludge densification are not fully understood, mainly because of the complex nature of iron chemistry, and the variety of amorphous, polymeric oxides that could be formed. In this work, the effects of alkaline reagents, flocculant addition, and dosing sequence, on the precipitation of iron (III) hydroxide and densification of the recycled sludge were investigated. Slowly dissolving lime (Ca(OH)₂) was found to be more effective than caustic (NaOH) in producing sludge with higher solid contents. Polymers addition created stronger aggregates that could withstand shearing without significant size reduction, but the overall sludge density was lower than those produced without flocculant. Conditioning the sludge at pH between 3.5 and 4.5 by adding fresh lime in a specific dosing manner appeared to be conducive to the growth of large agglomerates. The final sludge solid content of ∼15 wt.% was considerably higher than others produced under different conditions. The plate-like structures of precipitates generated with more recycles in this instance, possibly helped ease the release of entrapped water between solids during shearing, thus producing sludge with higher solid density.     

甚低频电磁法对脉状矿床勘查评价的意义——以金、铅锌(银)和萤石矿为例

脉状矿床是重要的矿床类型之一。其矿体往往赋存于断裂构造之中，甚低频电磁法（VLF-EM）以其成本低廉、轻便高效，以及对脉状矿（化）体特有的灵敏性而具有特色。文章通过对以脉状形式产出的金、铅锌（银）及萤石矿的VLF-EM找矿勘查实例，探讨了VLF-EM对这类矿床勘查的有效性和优越性，结果表明该方法对脉状矿床勘查评价有重要意义。     

原子探针层析技术及其在矿床研究中的应用

原子探针层析技术（APT）是一种能够以亚纳米分辨率提供定量的三维元素和同位素分析的测试分析技术,具有极高的空间分辨率和低的检出限。虽然原子探针主要用于材料科学和半导体领域,但随着近年来在矿床研究中应用的不断增加,正逐渐成为矿床研究的有用手段。与传统的地质分析技术相比,原子探针具有独特的技术优势,可以测量体积＜0.0007μm3的矿物的元素组成,能够在纳米尺度上揭示矿物成分的复杂性,为理解地质演化过程提供全新的认识。本文在简述原子探针层析技术的基本原理、样品的选择和处理以及针尖样品制备的基础上,重点从成矿元素赋存状态、纳米尺度包裹体和稳定同位素组成三个方面阐述了原子探针在矿床研究中的代表性应用成果。迄今为止,原子探针在矿床学中的应用主要集中在成矿元素赋存状态的分析上,尤其是与金矿相关的黄铁矿或其他化学组成相对简单的矿物。而在纳米尺度包裹体和稳定同位素组成方面,原子探针应用成果虽不如前者丰富,但也取得了一些重要的全新认识,表现出良好的应用前景。原子探针在矿床学领域迅速发展的同时,也存在一些亟需解决的问题,如复杂质谱峰的标定、三维重建失真等。尽管如此,相信随着技术的不断进步,原子探针将逐渐成为矿床研究的重要工具。     

Ore-Forming Fluids of the Aleksandrovskoe and Davenda Deposits (Eastern Transbaikalia)

Geology of Ore Deposits - A study of the composition of fluid inclusions in ore minerals of the Davenda Mo–porphyry deposit and the Aleksandrovskoe sulfide–quartz–gold ore...     

滇东北地区层控Pb-Zn-(F-Ba)矿床的热液喀斯特成因

滇东北地区上震旦统灯影组－下寒武统梅树村组中以白云岩为主岩的层控ＰｂＺｎ（ＦＢａ）矿床一直被认为是沉积或沉积改造矿床。但是，野外观察表明，它们是典型的、由成矿流体充填开放空间形成的后生矿床。被认为是同生成矿作用证据的条带状构造或“层状”构造却是成矿流体充填席状喀斯特洞穴的产物，以切割层理为特征。矿体具有典型喀斯特洞穴的形状。一些矿体呈球形———热液喀斯特洞穴所特有的形态。闪锌矿流体包裹体的均一温度为９０－１４０℃，共生萤石的ＲＥＥ地球化学特征和矿石的铅同位素数据表明，成矿金属来自上地壳而非玄武岩。成矿流体中水的δＤ和δ１８Ｏ值表明，成矿流体的水主要来自大气降水。ＰｂＺｎ（ＦＢａ）矿床有清楚的垂直分带：下部矿体形态不规则，有喀斯特洞穴的形态，Ｐｂ＞Ｚｎ，上部矿体呈层状、似层状（席状喀斯特洞穴形态），Ｚｎ＞Ｐｂ。依据矿床的地质地球化学特征提出了矿床的热液喀斯特成因模式。     

东秦岭160~140 Ma Cu(Mo)和Mo(W)矿床磷灰石成分特征

东秦岭地区分布有160~140 Ma斑岩、斑岩-矽卡岩型Cu(Mo)和Mo(W)两种不同矿化类型矿床,对两种矿化的成矿岩体中磷灰石进行成分分析,结果显示本次研究的Cu(Mo)和Mo(W)矿床成矿岩体的磷灰石均为岩浆磷灰石,但在主要成分和挥发份上两者具有一定的差异性。相对于Cu(Mo)矿床,Mo(W)矿床成矿岩体的磷灰石具有相对较高的F/Cl比值(分别为81~262和0.8~25)和MnO含量(分别为:0.05%~0.91%,平均为0.25%和0.02%~0.18%,平均为0.07%),说明Mo(W)矿床成矿岩体的岩浆源区具有较为强烈的沉积物源区特征。随着大地构造位置变化,从华北板块南缘到北秦岭,再到南秦岭,成矿岩体中磷灰石的F/Cl比值和MnO含量逐渐降低,说明岩浆源区中幔源物质成分逐渐增多。与此同时矿化类型也逐渐由Mo(W)矿化转变为Cu(Mo)矿化,这也说明成矿岩体岩浆源区特征对矿化类型具有一定的约束性。此外,Cu(Mo)和Mo(W)矿床成矿岩体中磷灰石具有不同的挥发份含量,而且挥发份类型对不同矿化元素具有选择性。相对于Cu(Mo)矿床,Mo(W)矿床的成矿岩体中磷灰石含有相对较高的F含量(2.83%~5.81%,平均为3.97%),较高的F含量能够提高熔体中羟基含量,增强Mo的配分系数,有利于Mo矿化。Cu(Mo)矿床的成矿岩体中磷灰石含有相对较高的Cl含量(0.13%~1.14%,平均为0.45%),主要与Cu在流体相中主要以氯合物形式存在,且Cu在熔体相和流体相间的分配系数与Cl含量呈正相关关系有关。Cu(Mo)和Mo(W)矿床成矿岩体中磷灰石均含有相似的SO3含量(均为0.17%),与斑岩型矿床中含矿岩体磷灰石的SO3范围相一致。但是,相对于典型大型、超大型斑岩型铜矿,东秦岭地区晚侏罗世—早白垩世Cu(Mo)矿床的成矿岩体中磷灰石SO3含量略低,相应的成矿岩浆也具有相对较低的氧逸度和S含量,而这可能是造成区域内Cu(Mo)矿化规模较小的原因之一。     

广东清远—高要金矿的40Ar／39Ar测年

广东新州至高要一带是广东主要的金矿带,那里有著名的河台金矿以及新州金矿和一些有远景的矿点。各地的金矿类型是不同的,关于金矿化时期是根据以往一些间接的地质资料推断的,没有直接的年代学资料。用40Ar/39Ar测年法测定了该地区主要矿床(点)中与金共生的绢(白)云母年龄,根据测年资料将区域金矿化分为四期,其时序是:早侏罗世184—171Ma,晚侏罗世141士6Ma,早白垩世133士2Ma和晚白垩世99士1Ma。     

Resource Evaluation and Some Genetic Aspects of Indium in the Japanese Ore Deposits

Abstract. There have been two primary sources for industrial indium; one from massive sulfides, while the other is dissemination-veins and skarns, related to felsic igneous rocks. The latter group of the In-bearing deposits is abundant in the Japanese Islands. Indium occurs as In-minerals such as sakuraiite, roquesite, laforetite and many unidentified minerals, but the majority is contained as an impurity in sphalerite, and tin and copper sulfides. Average grades of the ores from which indium has been extracted vary from a few ppm (e.g., Kosaka mine) to more than 300 ppm (Toyoha mine). The amount of indium in all the major basemetal deposits is estimated by analyzing representative samples. The main indium deposits are subvolcanic and tin-poly-metallic vein types. The largest one is Toyoha mine (4,700 tons hi) and the Ashio mine (ca. 1,200 tons In) was found to be the second largest. Many small occurrences, were recognized in the Miocene magnetite-series belt, besides the classic occurrences in the ilmenite-series granitic terrains of SW Japan, including the Ikuno and Akenobe tin(-tungsten) polymetallic veins, located in the northern margin of the late Cretaceous Sanyo ilmenite-series province. Magnetite-series magmas with deep source are necessary to concentrate sulfur in the magma chamber but sedimentary source rocks and their reducing agents are needed to collect and to precipitate indium. The Japanese islands are essentially accretionary terrains intruded by various deep oxidized magmas; thus forming magnetite/ilmenite-series paired belts, which are sometimes mixed. This unique geologic setting may be the most fundamental reason why indium is rich in vein-type deposits of the Japanese Island arcs.     

Gold Deposits of the Yenisei Ridge (Russia) and Age of Its Formation

Please refer to the attachment(s) for more details     

Uranium-Series Dating of Carbonate (Tufa) Deposits Associated with Quaternary Fluctuations of Pyramid Lake, Nevada

Uranium-series dating of dense tufa deposited in a small cave, at former lake margins, and in large tufa mounds clarifies the timing of lake-level variation during the past 400,000 yr in the Pyramid Lake basin. A moderate-sized lake occasionally overflowed the Emerson Pass sill at elevation of 1207 m between ca. 400,000 and 170,000 and from ca. 60,000 to 20,000 yr B.P., as shown by²³⁰Th/²³⁴U ages of the cave samples,²³⁰Th-excess ages of tubular tufas, and average isochron-plot ages of shoreline-deposited tufas. (By comparison, modern Pyramid Lake is 50 m below this sill). There is a lack of tufa record during the intervening period from ca. 170,000 to 60,000 yr B.P. After ca. 20,000 yr, Pyramid Lake underwent abrupt changes in level and, based on previous¹⁴C ages, reached its highest elevation (ca 1335 m) at ca. 14,000 yr B.P. The youngest uranium-series ages are comparable with previously reported¹⁴C ages.     

Cross-OSL and 14C Dating of Young Subaerial Deposits in the Sambia (Kaliningrad) Peninsula

Doklady Earth Sciences - The cross-instrumental dating of the Quaternary deposits in the Sambia (Kaliningrad) Peninsula has made it possible to obtain a time series that indicates the formation of...     

Metallogenic Regularities and Deposit Type of Rich (Ge-Ag)-Zn-Pb Deposits in the Sichuan－Yunnan－Guizhou Triangle (SYGT) Area, China

<正>1 Introduction The well-known1 Sichuan-Yunnan-Guizhou Triangle(SYGT)area of poly-metallic Zn-Pb deposits,southwest China is located at the south-western margin of the Yangtze Block in the transition area of the Tethys Belt and the Circum-Pacific Metallogenic Belt,and is composed of the Northeastern Yunnan,Northwestern     

藏南地区金和锑矿床(点)类型及其时空分布特征

本文首次对藏南地区金和锑矿床(点)地质特征、成因类型和空间分布特点进行了总结，对金和锑成矿作用与中新生代构造一岩浆活动的关系进行了论证，对区域地壳演化过程中金和锑成矿动力学机制进行了讨论。该区的金和锑矿床(点)可按容矿围岩划分为：①变质岩为主要容矿围岩矿床(点)，包括金和金一锑矿床(点)；②沉积岩为主要容矿围岩矿床(点)，包括金、锑、金一锑和锑多金属矿床(点)；③火山岩为主要容矿围岩矿床(点)，以金一银矿床为代表。根据金和锑矿床(点)空间分布特点和地质特点，将本区划分为4个矿化集中区：拉昂错一马攸木一帕羊金矿化集中区(A)，然勒金和锑矿化集中区(B)，洛扎一措美锑矿化集中区(C)和邛多江金一锑矿化集中区(D)。各矿化集中区内大多数金和锑矿床(点)与燕山晚期～喜马拉雅早期富碱火成岩具密切时空分布关系，它们是古板块对接碰撞期和碰撞期后大规模构造一岩浆活动的产物。近东西向挤压性和南北向张性断裂交汇部位以及富碱火成岩发育区是寻找金和锑矿床(点)的有利场所。     

Stabilization of Expansive Clays Using Granulated Blast Furnace Slag (GBFS) and GBFS-Cement

Expansive clays undergo swelling when subjected to water. This can cause damage, especially to light weight structures, water conveyance canals, lined reservoirs, highways, and airport runways unless appropriate measures are taken. In this study, granulated blast furnace slag (GBFS) and GBFS-cement (GBFSC) were utilized to overcome or to limit the expansion of an artificially prepared expansive soil sample (sample A). GBFS and GBFSC were added to sample A in proportions of 5–25% by weight. The effects of these stabilizers on grain size distribution, Atterberg limits, swelling percentage and rate of swell of soil samples were determined. GBFS and GBFSC were shown to successfully decreasing the total amount of swell while increasing the rate of swell.     

综合物探方法在蒙-甘-新相邻(北山)地区东段铜矿预查区勘查评价中的应用

内蒙古西部额勒根乌兰乌拉和乌珠尔嘎顺是两处极富地质找矿前景的铜矿预查区,物探测量发现多处激电和磁法异常,有些异常沿走向尚未封闭,少量槽探及钻孔均见不同程度矿化和硫化矿体.地质-物探综合研究认为,物探异常中多为矿致异常,说明激电、高精度磁法在该预查区矿产资源勘查与评价中是有效的.同时表明,该预查区具有良好的地质找矿前景.     

耐酸高强度改性树脂堵剂的室内评价

堵水和酸化连作技术是一种综合了堵水和酸化优势的集成技术,针对堵水和酸化连作技术中对堵剂性能的特殊要求,研制了一种以树脂产品为主体的堵剂,对影响堵剂固化性能的主要因素如尿素与甲醛配比、温度、固化剂加量、水加量、增塑剂加量、速控剂加量分别进行了研究,并对堵剂的耐温、耐盐和耐酸性能进行了测定.采用不同浓度的酸液与堵剂进行的配伍性实验结果表明,树脂堵剂与酸液之间的配伍性较好.岩芯模拟实验结果表明堵水和酸化连作工艺具有很强的改善产液剖面的能力.