山西省袁家村—狐姑山BIF铁矿床中硫化物(黄铁矿)赋存状态与成因机制

铁矿石中硫化物对选冶工艺具有显著影响,为了查明袁家村—狐姑山BIF铁矿床中硫的赋存状态、空间分布规律、源区及成因机制,对袁家村—狐姑山铁矿床中硫化物开展了野外地质调查、显微鉴定、矿物自动分析(MLA)与硫同位素分析。实验结果表明:(1)袁家村铁矿石中硫化物主要形成于沉积期、变质期、辉绿岩期与热液期,而狐姑山铁矿床中硫化物主要形成于沉积期、变质期与热液期;(2)袁家村—狐姑山铁矿床矿石中硫主要赋存于黄铁矿,次为黄铜矿、磁黄铁矿,另有少量的毒砂及硫酸盐类矿物;(3)各期次黄铁矿δ34 S均在零值附近,表明其主要来源于岩浆,沉积期部分可能混合了海水硫,显示混合来源的特征。综合分析认为袁家村—狐姑山铁矿床中硫化物的形成可能主要与海底火山热液活动相关,并受后期多期次岩浆热液叠加发生富集,可能与区域变质作用以及矿区广泛分布的岩浆活动有关。     

青海二道沟金矿床黄铁矿标型对矿床成因的指示

为查明二道沟金矿床成因,对其主要载矿矿物黄铁矿进行了标型研究。研究结果显示黄铁矿热电导型为P型占主导地位的N-P混合型,成矿温度主要集中在150~350℃之间,在化学成分上主要表现为铁亏型,同时发育硫亏型黄铁矿,Co、Ni含量分别为8%~11%和2%~8%,Co/Ni比值1. 13~5. 50,Au/Ag比值6. 00~25. 67。地质—地球化学特征表明:二道沟金矿床为一个受接触带构造控制的与燕山期构造—岩浆作用有关的岩浆期后热液矿床,构造与岩浆作用复合控矿特征明显。     

内蒙古嘎仙镍钴矿区物探找矿方法技术组合及应用

嘎仙镍钴矿地处西伯利亚地台与中朝准地台过渡地带,位于内蒙—大兴安岭褶皱系大兴安岭优地槽褶皱带,属岩浆熔离—热液改造型硫化物镍矿床.该矿床类型特征与常见的铜镍硫化物矿床不同,镍品位低、贫铜,镍钴矿(化)体赋存辉石橄榄岩中.金属矿物主要由黄铁矿、镍黄铁矿和磁铁矿等组成,其中镍黄铁矿与黄铁矿紧密共生,成不规则颗粒状镶嵌于黄铁矿中;而磁铁矿—般形成较晚,多见于镍黄铁矿中,呈网脉状产出.磁黄铁矿、镍黄铁矿呈浸染状、细脉状、细脉浸染状,局部斑块状、脉状,矿产于辉石橄榄岩中.通过对该区开展的地球物理工作,不仅对镍矿(化)体的空间分布特征及矿化富集规律有了很好的认识,而且总结出了该区找矿的最佳技术方法组合,即大功率单极—偶极测深装置激发极化法与高精度磁法的结合.     

广西龙胜大地金矿矿物特征及金赋存状态

广西龙胜大地金矿是桂北地区的剪切带型金矿床,具有石英脉型和构造蚀变岩型两种矿石类型。通过该矿矿物组成和金赋存状态研究,初步查明两种类型的矿石具有相同的矿物组合特征,但石英脉型金矿石中的金矿物主要以自然金的形式赋存于石英脉中,少量赋存于黄铁矿和毒砂中。构造蚀变岩型矿石中金矿物主要赋存于黄铁矿及少量毒砂中。两种矿石的金均以自然金为主,少量为银金矿,颗粒一般小于100μm,大部分为20~50μm。     

津巴布韦大岩墙铂族矿床分布特征及成因分析

津巴布韦大岩墙是一套铁镁质和超铁镁质的层状基性-超基性岩体,是铂族元素主要成矿地带。本文通过对大岩墙中铂族矿床的分布规律进行研究得出,本区铂族矿床主要产于岩体中硫化物带（MSZ）的底部,矿体呈层状、似层状赋存于辉石岩中,其埋深具有在大岩墙的两翼浅、核部深的特征。电子探针分析表明,铂族元素主要产于以磁黄铁矿、镍黄铁矿、黄铁矿为主的硫化矿物组合中,镍和钴的含量均较低。成因分析表明,矿床中铂族元素的富集与基性-超基性的岩浆分异作用关系密切,原始岩浆来源于地幔,成矿环境为低氧逸度和高硫逸度的还原环境,并具有多期成岩成矿特征。     

黄铁矿在不同CO_2体积分数下的转化行为研究

研究黄铁矿在CO_2气氛下的转化规律对于富氧燃烧技术的应用具有重要意义。为此在管式炉中开展了不同CO_2体积分数条件下黄铁矿的燃烧实验,实验温度为700℃。对固态产物进行XRD定性分析,同时采用便携式红外气体分析仪对气态产物进行实时在线监测。研究结果表明:CO_2体积分数的改变并不影响黄铁矿的分解转化机理;不同CO_2体积分数条件下,黄铁矿会与CO_2发生化学反应生成磁黄铁矿、SO_2、COS、CO,且同时还存在自分解反应生成硫单质;其中,黄铁矿分解过程中生成的COS主要来源于CO/CO_2和硫单质之间的二次反应。     

广西龙胜大地金矿矿物特征及金赋存状态

广西龙胜大地金矿是桂北地区的剪切带型金矿床,具有石英脉型和构造蚀变岩型两种矿石类型。通过该矿矿物组成和金赋存状态研究,初步查明两种类型的矿石具有相同的矿物组合特征,但石英脉型金矿石中的金矿物主要以自然金的形式赋存于石英脉中,少量赋存于黄铁矿和毒砂中。构造蚀变岩型矿石中金矿物主要赋存于黄铁矿及少量毒砂中。两种矿石的金均以自然金为主,少量为银金矿,颗粒一般小于100μm,大部分为20⁵0μm。     

贵州英坪钼镍多金属矿地质特征及成矿条件

区内早寒武世黑色岩系是由下至上分别为古风化壳、上磷矿层、钼镍多金属层、高炭质泥岩、炭质泥岩、含炭质泥岩的岩性组合,主要以泥炭质为主;具有黄铁矿化、硅化、碳酸盐化、重晶石化等蚀变现象;其中,古风化壳、上磷矿层不完全发育,而高炭质泥岩稳定产出可作为找矿标志层。英坪钼镍多金属层赋存于黑色岩系底部,为多金属硫化物、黏土矿物及高炭质泥岩组成的细层;顶底板标志清晰,界限分明,特征典型;矿石矿物以硫化物为主,脉石矿物以黏土、硅质、炭质为主,矿石结构以泥质(粉砂质)砾(粒)屑结构为主,矿石构造以叠层状构造为主。根据矿体(层)地质特征、沉积环境等综合分析,区内成矿条件主要受着地层岩性、古构造运动、岩相古地理及生物作用等多种因素的制约;根据矿体(层)赋存层位、岩性组合、顶底板特征、蚀变现象等综合分析,建立了本区的找矿标志。     

胶东乳山金矿金青顶矿区黄铁矿热电性研究

金青顶金矿黄铁矿α值离散性较大。Ｐ型黄铁矿出现率为８１．３％。导型组合在早成矿期Ⅰ－ｌ→Ⅰ－４阶段的变化是：Ｐ＞Ｎ→Ｐ》Ｎ→Ｐ》Ｎ→Ｐ＞Ｎ；在晚成矿期Ⅱ－２→Ⅱ－３阶段的变化为Ｐ＜Ｎ→Ｐ》Ｎ。在矿化地段，由上而下，αｐ减小，αＮ增大；Ｐ％减小，Ｎ％增大。其影响因素主要为黄铁矿中Ｃｏ，Ｎｉ，Ａｓ，Ｓｂ，Ｔｅ的含量，其次为结晶温度。用黄铁矿导型和αｐ均值所作矿物学填图反映的结果基本一致，从中可以取得有关黄铁矿形成温度，矿床剥蚀程度，矿体特征，深部远景和控矿构造等标型信息。     

冀东金厂峪金矿黄铁矿矿物特征研究

黄铁矿是金厂峪金矿主要的载金矿物,通过野外调查取样、显微镜观察和电子探针分析对其进行研究。根据金厂峪矿床野外产出的地质特征、矿脉间的穿插关系以及矿物共生组合特征,将矿床的成矿阶段划分为钠长石—石英阶段、石英—硫化物阶段、石英大脉和石英—碳酸盐四个阶段,并逐步分析各个阶段黄铁矿的特征。自然金产出于钠长石—石英阶段、石英—硫化物阶段的它形晶黄铁矿颗粒中。通过黄铁矿的化学成分分析,其矿床成因为岩浆热液型金矿床,成矿深度为中深部。     

Levels of antimony,arsenic, cadmium,copper, lead,mercury, selenium,silver, tin and zinc in bone tissue of industrially exposed workers

The contents of the elements antimony, arsenic, cadmium, copper, lead, mercury, selenium, silver, tin and zinc in bone tissue from autopsy specimens of the femur of workers who had been exposed to a large number of metals in a smeltery and refinery in Northern Sweden as well as of a control group have been quantitatively assayed.The analytical techniques used were atomic absorption spectrophotometry, neutron activation analysis and particle induced X-ray emission analysis (PIXE) in a proton microprobe. Increased levels of lead in the bone tissue of exposed workers compared to a non-exposed control group were observed. The median level of lead in the group of exposed workers exceeded the corresponding value of the control group about 5 times.Using the proton microprobe in the PIXE-mode, concentration profiles of copper, lead and zinc were examined within the Haversian system of the bone samples.     

Archi-Union Architects,City of Breeze,Shenzhen Bay,Shenzhen, China

What happens when ancient cultural practices are combined with the most current design technologies? Archi-Union Architects used the opportunity of their entry to the 2014 Shenzhen Bay ‘Super City’ International Competition to develop a bespoke generational method that integrated feng shui with advanced environmental simulation techniques. Philip F Yuan, the founder and director of Archi-Union Architects, who is Associate Professor in Architecture at Tongji University, Shanghai, here describes the City of Breeze project and the design methodology behind it.     

高黎贡手工造纸博物馆，云南，中国

纸张产生于迄今2000多年前,是中国古代四大发明之一。顾名思义,手工造纸博物馆展现了造纸的历史与过程,辅以现场演示和手工作坊的阐释手段。它展示、保存和开发当地的造纸艺术,并推动该领域的学术研究和文化交流。为了实现这些目标,博物馆为来访者提供了住宿和艺术家的住宅,并设计了一间茶室作为当地人的聚会活动场所。它可以视作中国近期发展小规模专业博物馆趋势的一部分。这些专业博物馆致力于记录和宣传中国的地区历史与文化。     

纳高尔堡修缮，纳高尔，拉贾斯坦，印度

拉贾斯坦邦中部的古城纳高尔是印度北部的穆斯林势力（12—16世纪）的第一批据点之一。纳高尔位于一条重要的马帮路线上,这里也是苏菲派重要的修行和朝圣中心。纳高尔堡坐落在一座小山上。     

清华大学建筑学院新馆,北京,中国

<正>新建筑馆的体量为旧馆内院的三边所限定。为了模糊表面之间的距离以消解位处夹缝中的压迫感,立面铺满倾斜的穿孔钢板。建筑下沉地面半层,底层架空并采用玻璃立面,东西两面向内退2m,以进一步获得轻盈感,减少对地面的压迫。立面划分为九宫格,并进一步由钢板均质划分,与无序的室外环境对比、相衬。新建筑不对旧立面做形态上     

Pollution of montane soil with Cu, Zn, As, Sb, Pb, and nitrate in Kanto, Japan

Soil cores and rainwater were sampled under canopies of Cryptomeria japonica in four montane areas along an atmospheric depositional gradient in Kanto, Japan. Soil cores (30 cm in depth) were divided into 2-cm or 4-cm segments for analysis. Vertical distributions of elemental enrichment ratios in soils were calculated as follows: (X/Al)_i/(X/Al)_BG (where the numerator and denominator are concentration ratios of element-X and Al in the i- and bottom segments of soil cores, respectively). The upper 14-cm soil layer showed higher levels of Cu, Zn, As, Sb, and Pb than the lower (14-30 cm) soil layer. In the four areas, the average enrichment ratios in the upper 6-cm soil layer were as follows: Pb (4.93) ≥ Sb (4.06) ≥ As (3.04) > Zn (1.71) ≥ Cu (1.56). Exogenous elements (kg/ha) accumulated in the upper 14-cm soil layer were as follows: Zn (26.0) > Pb (12.4) > Cu (4.48) ≥ As (3.43) ≥ Sb (0.49). These rank orders were consistent with those of elements in anthropogenic aerosols and polluted (roadside) air, respectively, indicating that air pollutants probably caused enrichment of these elements in the soil surface layer. Approximately half of the total concentrations of As, Sb, and Pb in the upper 14-cm soil layer were derived from exogenous (anthropogenic) sources. Sb showed the highest enrichment factor in anthropogenic aerosols, and shows similar deposition behavior to NO₃⁻, which is a typical acidic air pollutant. There was a strong correlation between Sb and NO₃⁻ concentrations in rainfall (e.g., in the throughfall under C. japonica: [NO₃⁻] = 21.1 [dissolved Sb], r = 0.938, p < 0.0001, n = 182). Using this correlation, total (cumulative) inputs of NO₃⁻ were estimated from the accumulated amounts of exogenous Sb in soils, i.e., 16.7 t/ha at Mt. Kinsyo (most polluted), 8.6 t/ha at Mt. Tsukuba (moderately polluted), and 5.8 t/ha at the Taga mountain system (least polluted). There are no visible ecological effects of these accumulated elements in the Kanto region at present. However, the concentrations of some elements are within a harmful range, according to the Ecological Soil Screening Levels determined by the U.S. Environmental Protection Agency.     

长生殿昆曲舞台,上海,中国

<正>戴志康邀请著名昆曲演员张军先生在会所表演昆曲经典戏目——长生殿。建筑师通过仔细研究会所,决定利用开放的下沉庭院,并尽量不改动现状来建设小剧院。他将中国古代在庭院临时分割空间的屏风这个概念,转换可以展现灯光图像的屏幕把整个庭院精致地隔离成一个抽象、纯粹、白色的场所。以最现代的形象表     

Determination of Co,Cu, Fe,Hg, Mn,Sb, Se and Zn in milk samples

Concentrations of Co, Cu, Fe, Hg, Mn, Sb, Se and Zn in IAEA milk (dry) standard A-11 were re-evaluated with the help of instrumental and radiochemical neutron activation analysis (NAA). The results show reasonably good agreement for Co (5.1 ± 0.55 ng/g) and Zn (34 ± 2.5 μg/g), in relation to the recommended values. For Cu (374 ± 15 ng/g), Fe (2.4 ± 0.34 μg/g) and Mn (250 ± 20 ng/g); the results obtained are lower than the reported values.Cu, Mn, and Zn were cross-checked by atomic absorption spectrophotometry (AAS). The results, Cu = 331 ± 27 ng/g, Mn = 302 ± 62 ng/g, and Zn = 35 ± 1 μg/g, fall within the range of mean values obtained by NAA.For Hg and Se, using instrumental NAA, only upper limits could be indicated; because of the low levels of concentrations of Hg and Se on one hand, and high content of P (9100 μg/g) in A-11 milk standard on the other, NAA coupled with radiochemistry is to be preferred for these two elements.In pooled human milk, in addition to Cu and Mn (radiochemical) and Co, Fe, Sb and Zn (instrumental), Hg and Se could also be determined non-destructively because of the favourable Hg/P and Se/P ratios in this matrix.     

城市风貌特色的维护、弘扬、完善和塑造

城市风貌特色鲜明是世界上绝大多数优秀城市所共有的一种品质.城市风貌特色具有历史积淀、形态延续和有序演进三大特点.我国城市风貌特色的维育应善于把握城市发展和建设机遇,树立城市人工建设和自然要素的和谐观,遵循总体调控、分区突出倾向、局部彰显特色的原则,努力构建多样统一、和而不同的城市风貌特色.