新矿物长城矿—铱的硫铋化物          下载免费PDF全文

於祖相 《地质学报》1997,71(4):336-339

长城矿产在铬铁矿体及临近矿体的铂砂矿中。呈块状聚集体或细脉状,分布在硫铱矿的边缘并交代它。不透明,金属光泽,钢灰色,条痕黑色。莫氏硬度H_M=3.7,显微硬度VHN_(20)=165kg/mm~2。均质性,无解理。计算密度D_(calc.)=11.96g/cm~3。7个电子探针分析的平均化学成分(％):S 7.2,Cu 0.3,Te 0.4,Ir 41.2,Pt 2.8,Bi 47.2,总量99.1。简化的化学式为IrBiS。5条最强X射线粉晶衍射线(hkl,d,I)为:210,2.75(70);211,2.51(60);311,1.860(100);440,1.090(50);600,1.027(50)。X射线粉晶衍射图谱与马营矿相似。进行对比后,长城矿可以指标化为等轴晶系、空间群P2_13。由X射线粉晶衍射线求得α=0.6164(4)nm,V=0.2342nm~3,Z=4。  相似文献   

Yixunite and Damiaoite—A Twin of New Native Alloys of Indium and Platinum from the Yanshan Mountains     

Yu ZuxiangInstitute of Geology  Chinese Academy of Geological Sciences  Baiwanzhuan  Beijing 《《地质学报》英文版》1997,71(4):480-485

Yixunite and damiaoite Were found in a cobalt- and copper-bearing platinum ore vein of a contact metasomatic deposit. The chief ore minerals are bornite, chalcopyrite, magnetite and carrollite. The platinum minerals include moncheite, sperrylite, daomanite, cobalt malanite and cooperite. Yixunite and damiaoite occur as immiscible globules, 1.0 to 2.0 mm in diameter. Yixunite is always in the central part of a globule. It is opaque with metallic lustre, bright white colour and black streak. HM = 5.8; VHN50 = 634 kg/mm2 (573-681 kg/ mm2); insoluble in HCl, HNO3, HF or H3PO4; no cleavage; no magnetism. Density is hard to measure because of small grain size. Calculated density = 18.21 g/cm3. Reflective colour is bright white with a yellowish tint. Isotropic. The mean analytical results (ranges) (%) are: Pt 82.8 (81.8-83.6), In 16.4(15.6-17.1) and total 99.2. The empirical formula (based on 4 atoms) is Pt2.993 In1.007 . The five strongest lines of X-ray diffraction (hkl, d,I) are 111, 2.30 (100); 200, 1.99 (  相似文献   

Changchengite—A New Iridium Bismuthide-Sulphide from the Yanshan Mountains     

Yu ZuxiangInstitute of Geology  Chinese Academy of Geological Sciences  Baiwanzhuang  Beijing 《《地质学报》英文版》1997,71(4):486-490

Changchengite occurs in chromite orebodies in dunite and in platinum placer deposits in chromite orebodies nearby. The mineral occurs as massive aggregates or veinlets on margins of iridisite (IrS2) and replaces it. Opaque. Lustre metallic. Colour steel-black. Streak black. Hm = 3.7. VHN20= 165 kg/ mm2. Isotropic. Cleavage none. Density 11.96 g/ cm3. Seven electron microprobe analyses give the following mean chemical results (wt. %): S 7.2, Cu 0.3, Te 0.4, Ir 41.2, Pt 2.8 and Bi 47.3 with total 99.1. The simplified formula is IrBiS. The strongest X-ray powder diffraction lines (hkl, d, I) are 210, 2.75 (70); 211, 2.51 (60); 311, 1.860 (100); 440. 1.090 (50) and 600, 1.027 (50). The X-ray powder diffraction pattern is similar to that of mayingite. After the diffraction data are indexed the mineral is determined to be cubic. The space group is P213 with a = 0.6164(4) nm, V = 0.2342 nm3 and Z = 4.  相似文献   

辽西义县组奔龙类化石一新种   总被引：4，自引：1，他引：4  

刘金远  姬书安唐烽　高春玲 《地质通报》2004,23(8):778-783

在辽宁西部义县头台的义县组中新发现的1件奔龙类化石标本，显示出许多中国鸟龙属(Sinornithosaurus)所具有的特征，如上颌骨眶前窝侧面具有装饰性凹坑、前颌骨齿无边缘小锯齿、齿骨后缘二分叉、指节Ⅲ-1略长于指节Ⅲ-2的2倍、踱骨Ⅲ部分窄踱型形态等。但其头骨的部分骨骼与千禧中国鸟龙(S．millenii)有明显的区别：前颌骨主体部分相对较高，其长仅稍大于其高，前颌骨角大，前颌骨上颌突与鼻突均很长，上颌骨不参与外鼻孔的构成，上颌骨窗相对较小且为圆形，方颧骨上升突明显长于颧骨突，齿骨长高之比小等。此外，新标本肠骨的耻骨柄前后方向的宽度小于髋臼宽度。这些不同之处表明，义县头台的标本应为中国鸟龙属另一新种，将其命名为郝氏中国鸟龙(新种)(S．haoiana sp．nov.)。  相似文献   

多年冻土区路桥过渡段的一种新结构     

刘建坤  鲍维猛  黎明  葛建军 《冰川冻土》2004,26(Z1):210-214

The design of roadbed-abutment transition part is always a challenging problem in transportation engineering, especially in permafrost distribution zone. A new type of roadbed-abutment transition part on permafrost was presented, and long-term observation was conducted for the deformation and the thermal regime of a roadbed-abutment transition part in the constructing Qinghai-Tibet Railway. In this paper, a new structure was presented and the observed settlements both in the subgrade and the base and its dependency with the thermal regime (permafrost table) were analyzed. In conclusion the roadbed-a-butment transition method for permafrost distribution zone was evaluated.  相似文献   

电吸附找矿方法   总被引：3，自引：2，他引：3  

周奇明  周立宏  董树政 《物探与化探》2004,28(3):199-201

电吸附找矿方法是找隐伏矿的新方法。它是指通过物理化学手段来发现后生地球化学异常的找矿方法。它是建立在异常元素地球化学理论和野外地电提取法的理论基础之上。利用电吸附找矿方法在一些已知矿床进行找矿效果试验,获得了很好的效果,说明了该方法找矿的有效性。  相似文献   

广西新型矿物材料发展方向初探     

李艺 《矿产与地质》2004,18(1):42-45

新材料是发展高新技术产业的基础。根据广西的矿产资源优势和在矿物材料方面的研究基础和技术力量，提出了加强工艺矿物学研究，大力发展广西新型矿物材料的研究开发方向，特别提出了超细改性矿物粉体材料、环保矿物材料、节能保温矿物材料、高技术陶瓷材料和合成矿物晶体材料等材料体系中的重点开发方向。  相似文献   

西昌盆地油气化探普查效果及下一步找油气方向   总被引：1，自引：0，他引：1  

颜自给  樊建强  贾国相  赵友方  何政才 《矿产与地质》2004,18(4):335-338

为了配合国家加快油气资源勘查步伐，四川石油管理局将西昌盆地作为下一步勘探重点地区，由于西昌盆地属勘探新区，各种地质、构造情况复杂，首先在该区实施了油气化探普查，油气化探普查结果证实了西昌盆地中部地区为油气泄漏特征，这与七坝1井结果吻合，同时发现了三个重点区域，指出盆地西部为下一步工作的重点地区，为下一步地震勘探指明找油气方向。  相似文献   

论新土地分类在1∶1000土地利用现状调查中的应用     

曾乐春  王兆礼  简陆芽 《云南地理环境研究》2004,(4)

根据新土地分类在南海区1∶1000土地利用现状调查中的应用,采用文献分析法和实例验证法,探讨其在大比例尺土地利用现状调查中的适用性。结果表明:新土地分类在使用中存在诸如分类层次数目少且略显粗糙以及界线不严谨等问题。提出建议:增加分类层次熏进一步细化分类;更清晰表达地类涵义以及统一分类标准等。  相似文献   

Weights of Evidence Modeling of Mineral Potential: A Case Study Using Small Number of Prospects,Abra, Philippines   总被引：9，自引：1，他引：9  

Carranza  Emmanuel John M. 《Natural Resources Research》2004,13(3):173-187

Weights of evidence (WofE) modeling usually is applied to map mineral potential in areas with large number of deposits/prospects. In this paper, WofE modeling is applied to a case study area measuring about 920 km² with 12 known porphyry copper prospects. A pixel size of 100 m × 100 m was used in the spatial data analyses to represent in a raster-based GIS lateral extents of prospects and of geological features considered as spatial evidence. Predictor maps were created based on (a) estimates of studentized values of positive spatial association between prospects and spatial evidence; (b) proportion of number of prospects in zones where spatial evidence is present; and (c) geological interpretations of positive spatial association between prospects and spatial evidence. Uncertainty because of missing geochemical evidence is shown to have an influence on tests of assumption of conditional independence (CI) among predictor maps with respect to prospects. For the final predictive model, assumption of CI is rejected based on omnibus test but is accepted based on a new omnibus test. The final predictive model, which delineates 30% of study area as zones with potential for porphyry copper, has 83% success rate and 73% prediction rate. The results demonstrate plausibility of WofE modeling of mineral potential in large areas with small number of mineral prospects.  相似文献