共查询到20条相似文献，搜索用时 881 毫秒
1.
江西新余铁矿田铁矿成矿地质特征与成因分析 总被引：3，自引：0，他引：3
本文总结了新余铁矿田矿层和含铁岩系变化特征、矿层顶板、底板和含铁岩系标志层特征以及矿田东、中、西段构造特征,分析了铁矿的沉积成岩作用以及构造演化历史,解释了新余铁矿田的各种成矿地质特征,并运用系统分析方法和历史分析方法说明矿田成矿地质系统的内在规律,认为该矿床属于火山-沉积变质铁矿,其物质成分较稳定,体现出规律性的变形... 相似文献
2.
矽卡岩型铁矿的铁质来源与迁移富集机理探讨 总被引：4，自引：0，他引：4
矽卡岩型铁矿是我国最重要的富铁矿类型,其铁质来源及迁移富集机理是目前最核心、也最具争议的问题之一。本文在矽卡岩矿床复杂性和多成因性研究的基础上,对浅部铁质活化、迁移和富集机理进行整理归纳,建立了流程图;分别探讨了不同类矽卡岩型铁矿铁质的最大可能来源,认为与中酸性侵入体有关的该类铁矿,铁质主要源于浅部侵入岩;与酸性侵入体有关的该类铁矿,矿床附近的原始赋铁层位可能提供了大量铁质。但并非所有与酸性岩有关的此类铁床附近都存在赋铁地层,故本文对铁质深部来源的可能性进行了探讨,结合"岩浆矽卡岩-富碱侵入岩对"的概念,提出了全新的深部铁质活化、运移和富集的可能模式,即深部岩浆同化钙质岩石融离出的富铁矿浆上升并运移到浅部侵入岩与碳酸盐岩的接触带附近,与该系统中的热液相遇并反应,热液吸收矿浆中的铁质生成富铁的复合热液,后复合热液在接触带因物理化学条件的剧变而沉淀成矿。 相似文献
3.
The study of the problem of the black coloration of feldspathoids of the sodalitic group (nosean, haüyne, sodalite) reveals iron as a main factor.A statistical study of the global compositions of these minerals proves that their enriching inFe is accompanied by a decrease in Al, but also by an increase in Si.A substitution of Fe+++ to Al in the structure in the feldspathoids is suggested.The analysis with an electron microprobe confirms this hypothesis and allows us to state a fondamental difference between the formation of miaskitic phonolites rich in Fe++ and that of agpaitic phonolites rich in Fe+++. 相似文献
4.
5.
新余铁矿田含铁岩系地层物质系统沉积的地球化学环境是一个氧化相-弱氧化相-弱还原相-还原相的演变过程.矿田经历了澄江-加里东构造旋回的多期次、多方向、多型式褶皱构造改造.新余铁矿田矿层和舍铁岩系的各种成矿地质特征以及矿田东、中、西段构造特征是铁矿的沉积成岩作用以及构造演化历史的物质反映.应用系统分析方法和历史分析方法分析矿田成矿地质系统的内在规律,总结新余铁矿田矿层和舍铁岩系变化特征,矿层顶板、底板和含铁岩系标志层特征以及矿田东、中、西段构造特征.解释新余铁矿田单层矿"红绸舞式"褶皱的成因,为铁矿勘查工作提供借鉴. 相似文献
6.
Iron porphyrins have been isolated from seven U.S. humic coals of various geological ages. Mass spectrometry shows that for the higher rank coals the porphyrins comprise an homologous series of alkyl derivatives (C27-C32). Mesoheme is detected in a Cretaceous lignite from Montana. 相似文献
7.
The chemical composition of six iron ore standards is presented. Twenty selected laboratories in the member countries of the European Coal and Steel have participated in their certification. 相似文献
8.
在传统的铁矿石物相分析中,磁性铁用盐酸溶解,有的样品溶解不完全,故而造成各单项加和低于全铁分析结果.笔者通过试验,发现用硫磷混酸或残渣碱熔能很好地分解磁性铁,使单项加和与全铁分析结果一致. 相似文献
9.
In those ten years, during the prospecting and developing of the many iron oredeposits scattering along the Lower Yangtze River especially fromWuhu to Nanking 1 have recognized that the phosphorus content in the orebodies was not distributed even in the same ore body. 相似文献
10.
Iron sulfide oxidation and the chemistry of acid generation 总被引：3，自引：0，他引：3
Acid mine drainage, produced from the oxidation of iron sulfides, often contains elevated levels of dissolved aluminum (AI),
iron (Fe), and sulfate (SO4) and low pH. Understanding the interactions of these elements associated with acid mine drainage is necessary for proper
solid waste management planning. Two eastern oil shales were leached using humidity cell methods. This study used a New Albany
Shale (4.6 percent pyrite) and a Chattanooga Shale (1.5 percent pyrite). The leachates from the humidity cells were filtered,
and the filtrates were analyzed for total concentrations of cations and anions. After correcting for significant solution
species and complexes, ion activities were calculated from total concentrations. The results show that the activities of Fe3+, Fe2+, Al3+, and SO4
2− increased due to the oxidation of pyrite. Furthermore, the oxidation of pyrite resulted in a decreased pH and an increased
pe+pH (redox-potential). The Fe3+ and Fe2+ activities appeared to be controlled by amorphous Fe(OH)3 solid phase above a pH of 6.0 and below pe+pH 11.0. The Fe3+, Fe2+, and SO4
2− activities reached saturation with respect to FeOHSO4 solid phase between pH 3.0 and 6.0 and below pe+pH 11.0 Below a pH of 3.0 and above a pe+pH of 11.0, Fe2+, Fe3+, and SO4
2− activities are supported by FeSO4·7H2O solid phase. Above a pH of 6.0, the Al3+ activity showed an equilibrium with amorphous Al(OH)3 solid phase. Below pH 6.0, Al3+ and SO4
2− activities are regulated by the AlOHSO4 solid phase, irrespective of pe+pH. The results of this study suggest that under oxidizing conditions with low to high leaching
potential, activities of Al and Fe can be predicted on the basis of secondary mineral formation over a wide range of pH and
redox. As a result, the long-term chemistry associated with disposal environments can be largely predicted (including trace
elements). 相似文献
11.
提出了超声波提取-火焰原子吸收光谱法测定灰岩中Fe(Ⅱ)的方法,通过对总铁含量进行测定,采用差减法计算Fe(Ⅲ)的含量,从而实现了灰岩中铁的价态分析。探讨了Al2(SO4)3溶液选择性提取岩石样品中微量Fe(Ⅱ)的化学条件及其他仪器参数。结果表明,20~30℃下,0.025 mol/L Al2(SO4)3在土液比1∶300、提取时间1 h条件下可有效提取碳酸盐相中Fe(Ⅱ)离子。该方法用于国家一级标准物质中Fe(Ⅱ)和Fe(Ⅲ)的测定,测定结果与推荐值吻合。运用本法对实际地质样品中的总铁和Fe(Ⅱ)进行分析测定,加标回收率分别为96.07%~103.23%,95.79%~102.11%。 相似文献
12.
《Applied Geochemistry》1999,14(5):655-667
Sediments sampled at a hydrocarbon-contaminated, glacial-outwash, sandy aquifer near Bemidji, Minnesota, were analyzed for sediment-associated Fe with several techniques. Extraction with 0.5 M HCl dissolved poorly crystalline Fe oxides and small amounts of Fe in crystalline Fe oxides, and extracted Fe from phyllosilicates. Use of Ti-citrate-EDTA-bicarbonate results in more complete removal of crystalline Fe oxides. The average HCl-extractable Fe(III) concentration in the sediments closest to the crude-oil contamination (16.2 μmol/g) has been reduced by up to 30% from background values (23.8 μmol/g) as a result of Fe(III) reduction in contaminated anoxic groundwater. Iron(II) concentrations are elevated in sediments within an anoxic plume in the aquifer. Iron(II) values under the oil body (19.2 μmol/g) are as much as 4 times those in the background sediments (4.6 μmol/g), indicating incorporation of reduced Fe in the contaminated sediments. A 70% increase in total extractable Fe at the anoxic/oxic transition zone indicates reoxidation and precipitation of Fe mobilized from sediment in the anoxic plume. Scanning electron microscopy detected authigenic ferroan calcite in the anoxic sediments and confirmed abundant Fe(III) oxyhydroxides at the anoxic/oxic boundary. The redox biogeochemistry of Fe in this system is coupled to contaminant degradation and is important in predicting processes of hydrocarbon degradation. 相似文献
13.
Problems of Iron and Phosphorus Geochemistry in the Precambrian 总被引：1，自引：0，他引：1
The localization of economic sedimentary iron ore and phosphorite resources is discussed in comparative aspects. It is shown that the major economic resources of iron ore are hosted in Precambrian rocks, whereas the phosphorites are related to Upper Phanerozoic. High-temperature hydrothermal solutions served as an important source of iron for jaspilite ores. The low P2O5content therein indicates that the phosphorus deposition was only weakly related to the hydrothermal activity. Thus, the hydrothermal origin of phosphorite is denied from the geochemical standpoint. 相似文献
14.
《地质学报》1937,17(1)
Early in April 1935 the senior writer together with his formercolleague,Prof.T.O.Chu took a party of students of the graduatingclass of the Department of Geology,National Central University to theiron and copper mining region of south-eastern Hupeh.One of thelocalities visited is the celebrated iron deposit of Tayeh now in active 相似文献
15.
我国每年铁矿石供应缺口较大，并在逐年扩大，认真抓好现有矿山，充分利用现有铁矿资源，减少缺口，已势在必行。文章结合冶口 铁矿实际，提出有关措施，继续对矿山优惠政策，并鼓励矿山充分利用资源，加强矿山技术改造，坚持采矿与找矿并重，努力提高矿石的开采回收率，减少损失率，降低 相似文献
16.
The chemical composition of eight german ore standards, seven iron ores and one manganese ore, is presented. A certificate of analysis supplied with each sample is given as an example; it contains the names of the co-operating laboratories, the- mean value obtained by each laboratory for each element and a statistical evaluation of the laboratory means. A summary is also given of the methods used. 相似文献
17.
Iron tracer diffusion experiments in diopside have been performed using natural and synthetic single crystals of diopside,
and stable iron tracers enriched in 54Fe, at temperatures in the range 950–1100 °C, total pressure 1 atm, for times up to 29 days. Iron isotope diffusion profiles
were determined with an ion microprobe. For experiments performed at log pO2 = −13, in directions parallel to the c axis and the b axis of two natural, low iron (Fe ∼ 1.8 at %) diopsides, the data obey
a single Arrhenius relationship of the form D = 6.22−5.9
+49.6×10−15 exp(−161.5 ± 35.0 kJ mol−1/RT) m2 s−1. A single datum for iron diffusion in iron-free, single-crystal diopside at 1050 °C, is approximately 1 order of magnitude
slower than in the natural crystals. The pO2 dependence of iron diffusion in natural crystals at 1050 °C (power exponent = 0.229 ± 0.036) indicates a vacancy mechanism;
this is consistent with the results of unpublished atomistic simulation studies. There is no evidence of anisotropy for iron
diffusion in diopside.
Received: 16 March 1999 / Accepted: 10 April 2000 相似文献
18.
The mineral composition and geochemistry of poppy-shaped ores, which represented river-bed alluvium and interore clay sediments formed in oxbow zones of the Lisakov deposit (northern Kazakhstan), are examined. Specific features of trace element distribution in oolitic ores, magnetic concentrate of oolites, interore clays, and fine clay fraction are analyzed. 相似文献
19.
在苏丹东部地区新元古代地层中,新发现的BIF铁矿是与火山岩密切相关的Algoma型铁矿,矿石品位TFe 37.78%,对进一步研究努比亚地盾的形成时代和古地理环境有一定的参考意义。苏丹79区块发现的含铁石英砂岩,呈北东向带状分布, 角度不整合于努比亚地盾之上,通过与西澳CID型铁矿对比,存在交错层理和底砾岩等明显的再生沉积特征,矿石品位TFe 31.91%～39.33%;通过对BIF型铁矿、CID型铁矿和努比亚杂砂岩三者部分元素及氧化物含量的分析对比,以及控矿地质因素分析, CID型铁矿是由BIF铁矿风化剥蚀后搬运沉积于附近古河道内;苏丹努比亚地盾区CID型铁矿的发现,为今后找矿工作提供了新目标,具有十分重要的找矿意义。 相似文献
20.
K. D. Litasov A. Ishikawa I. S. Bazhan D. S. Ponomarev T. Hirata N. M. Podgornykh N. P. Pokhilenko 《Doklady Earth Sciences》2018,478(1):62-66
A complete microelement analysis of the Chinga meteorite was performed, and the possibility of attributing it together with a number of other iron meteorites into the IVC subgroup, which is transition between IVA and IVB is proposed. 相似文献