元素分配与某些矿床分带关系及氯氟在元素迁移中的作用     

赵斌  赵劲松  陈松乔  柏天宝 《矿物岩石地球化学通报》1994,(1)

元素分配与某些矿床分带关系及氯氟在元素迁移中的作用赵斌，赵劲松（中国科学院广州地质新技术所，广州５１０６４０）陈松乔，柏天宝（中国科学院地球化学研究所，贵阳５５０００２）关键词分配系数，矿床分带，氟氯元素迁移我国南方大厂、东坡、个旧、香花岭、大吉山、...  相似文献   

REE Tetrad Effects in Rare—metal Granites   总被引：1，自引：1，他引：1  

赵振华  AKIMASAMASUDA 《中国地球化学学报》1993,12(3):206-219

Described in this paper are the characteristics of tetrad effects of REE in rare-metal granites.Based on the analytical data and experimental geochemical data available,it is pointed out that the tetrad effects of REE in the granites are produced in the metal-fluid system.Intense fractional crystallization of granitic melt(containing REE accessary minerals)and its interaction with volatile-rich(F,Cl)fluid are the major factors leading to the tetrad effects of REE.From this,this paper presents a composite genetic model for high-degree fractional crystallization-volatile-rich fluid metasomatism of rare-metal granites.With the model,quantitative calculations have been made.Meanwhile,it is pointed out that the tetrad effects of REE can be used as an important indicator to distinguish mineralized granites from barren ones.  相似文献   

菱镁矿轻烧的试验研究     

于漧  于宏杰 《矿物岩石地球化学通报》1993,(3)

菱镁矿深加工的必需步骤是煅烧,它直接影响深加工产品的质量。本文从轻烧镁用作氯氧镁水泥制品的角度,对菱镁矿的轻烧温度、影响因素、质量标准等作初步探讨。 1.菱镁矿的矿物化学特征分类菱镁矿从工艺的角度可划分为高硅高钙型、低硅高钙型、低硅低钙型、高硅低钙型4大类。从作氯氧镁水泥制品的角度,低硅低钙型和高硅低钙型的菱镁矿最好。我国除内蒙、河北邢台、西南某地、肃北别盖的菱镁矿属于高钙型的之外,其它皆为低钙型的。  相似文献   

扩散分离离子色谱法测定化探样品中痕量氯,溴,碘   总被引：2，自引：0，他引：2  

刘庆学  李桂花 《地质实验室》1993,9(2):107-109

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溶胶-凝胶法制备纳米氧化镁研究   总被引：4，自引：0，他引：4       下载免费PDF全文

宋士涛  邓小川  孙建之  马培华  闫春燕  魏述彬 《盐湖研究》2005,13(3):38-40

以硝酸镁和硬脂酸为原料,用溶胶—凝胶(Sol-Gel)法制备得到了纳米氧化镁微粒,并用热重(TG)分析、X-射线粉末衍射(XRD)、红外光谱(IR)和透射电镜(TEM)等对该纳米微粒的结构与形貌进行了表征。结果表明,控制Mg(NO3)2和CH3(CH2)16COOH物质的量比为1∶4,在90℃反应20 min并于360℃热处理4 h,得到立方相氧化镁纳米微粒,形貌为椭球体,分散性好,平均粒径约为33 nm。  相似文献   

Elemental geochemistry and Nd isotopic characteristics of the metasedimentary rocks from the metamorphic belt in central Jiangxi： Provenance and tectonically environmental constraints     

胡恭任  刘丛强  章邦桐  唐红峰  于瑞莲 《中国地球化学学报》2005,24(1):37-50

The metamorphic belt in central Jiangxi, located in the compound terrain within the Cathaysia, Yangtze Block and Caledonian fold zone of South China, is composed dominantly of meta-argillo-arenaceous rocks, with minor amphibolite. These rocks underwent amphibolite-facies metamorphism. The meta-argillo-arenaceous rocks show large variations in major element composition, but have similar REE patterns and trace element composition, incompatible element and LIE enrichments [ high Th/Sc (0.57-3.59) , La/Sc ( 1.46 - 12.4), La/Yb (5.84 - 19.0) ] and variable Th/U ratios, with ∑REE = 129-296μg/g, δEu =0.51 -0.86, and (La/Yb)N = 3.95 -12.9. The Nd isotopic model ages tDM of these rocks vary from 1597 to 2124 Ma. Their 143 Nd/144 Nd values are low [εNd (0) = - 11.4 to -- 15.8]. Some conclusions have been drawn as follows: (1) The metamorphic rocks in central Jiangxi Province are likely formed in a tectonic environment at the passive continental margin of the Cathaysia massif. (2) The metamorphosed argillo-arenaceous rocks are composed dominantly of upper crustal-source rocks (Al- and Krich granitic or/and sedimentary rocks of Early Proterozoic), which experienced good sorting, slow deposition and more intense chemical weathering. (3) According to the whole-rock Sm-Nd isochron ages (1113±49 to 1199 ± 26 Ma) of plagioclase-amphibole (schist) and Nd isotopic model age tDM ( 1597 - 2124Ma) of meta-argillo-arenaceous rocks, the metamorphic belt in central Jiangxi Province was formed during the Middle Proterozoic ( 1100 - 1600 Ma).  相似文献   

有机配合物前驱体法合成纳米氧化镁研究及此法的应用前景          下载免费PDF全文

刘宁  张勇  杨建元 《盐湖研究》2006,14(4):61-65

综述了利用我国盐湖镁资源,以乙酰丙酮及其衍生物、有机胺和醋酸根为配位剂,采用有机配合物为前驱体合成纳米氧化镁的方法,前驱体形成的机理以及特点和优势。通过介绍此合成法在合成纳米金属粉体、其它金属氧化物粉体、无机盐粉体、氧化物薄膜或复合氧化物薄膜以及特殊结构化合物等方面广泛应用的实例,并预测了该法在合成其它高值化镁产品中的应用前景。  相似文献   

Dechlorination of trichloroethylene in solution over supported nano zero valent Fe and Cu/Fe bimetal on exfoliated graphite     

Huan ZHANG Zhaohui JIN Lu HAN Zongming XIU Chenghua QIN 《中国地球化学学报》2006,25(B08):132-133

Degradation of organic halides by reductive dehalogenation promoted by zerovalent metals is a very active research area. The use of nano-sized particles of zero valent iron （ZVI） or bimetallic combinations of ZVI currently attracts the most attention due to their high surface areas and high reactive activity. The introduction of second catalytic metals, such as Pd, Pt, Cu, or Ni, results in an even higher dehalogenation rate. The supported zero-valent iron materials have higher activity and greater flexibility for environmental remediation applications than other forms of ZVI. Nano ZVI supported on micro-scale exfoliated graphite was prepared by using KBH4 as the reducing agent in the H2O/ethanol solution of Fe^2＋ in the laboratory. Then the ethanol solution of Cu^2＋ was added to the fleshly prepared wet supported nano ZVI. The Fe/Cu bimetallic particles supported on the graphite were obtained because of the reduction and deposition of Cu on the Fe surface. The TEM image showed that iron particles were highly dispersed on the surface of graphite. In this study, supported zero valent Cu/Fe bimetallic nanoparticles were used for the dehalogenation of trichloroethylene （TCE） in batch experiments. The dechlorination rate of supported zero valent Fe/Cu bimetallic nanoparticles was greater than the supported nano ZVI. Supported Cu/Fe bimetal with 4 wt% Cu had the fastest dehalogenation rate than that with different content of Cu. When the nana FeO dosage was 5 g/L in the dehalogention system, 8 mg/L of TCE was completely dechlorinated within 4 hours. Increasing or decreasing the FeO dosage, the dechlorination rate could be worse. When the concentration of Fe^2＋ was 0.05 mol/L during the preparation by KBH4 reduction, the nano Cu/Fe particles exhibited the spheral shape with 50-80 nm in size. When the concentration of Fe^2＋ was higher （0.2 mol/L）, the nano particles were the palpus structure and had the poor dehalogenation effect on the TCE.  相似文献   

羟氯镁铝石的高分辨透射电镜观察     

秦善  曹正民 《地球科学》1998,23(3):78

羟氯镁铝石（ｋｏｅｎｅｎｉｔｅ）为典型的异类结构基元层间层矿物．结构以氯化物层（Ｎａ,Ｍｇ）Ｃｌ２和氢氧化物层（Ｍｇ,Ａｌ）（ＯＨ）２沿ｃ方向规则交互构成．以前的研究认为构成羟氯镁铝石的两个亚结构有不同的空间群和晶胞参数．本次以高分辨透射电子显微镜的研究结果表明,羟氯镁铝石在ｃ方向的重复周期为１．０８ｎｍ左右,在ａ方向上没有显示出层失配特点,说明它是一种有序的晶体．对结构基元层层间的静电作用势能的定量计算表明,层间作用力相对较弱,为１０４．９０ｋＪ／ｍｏｌ．  相似文献   

羟氨镁铝石的高分辨透射电镜观察   总被引：1，自引：0，他引：1  

秦善  曹正民 《地球科学》1998,23(3):253-256

羟氯镁铝石（ｋｏｅｎｅｎｉｔｅ）为典型的异类结构基元间层矿物。结构以氯化物层（Ｎａ、Ｍｇ）Ｃｌ２和氢氧化物层（Ｍｇ、Ａｌ）（ＯＨ２）沿ｃ方向规则交互构成,以前的威研究认为构成羟氢镁铝石的两个亚结构有不同的空间群和晶胞参数。本次以高分辨透射电子显微镜的研究结果表明,羟氢镁镁铝石在ｃ方向的重复周期为１．０８ｎｍ左右,在ａ方向上没有显示出层失配特点,说明它是一种有序的晶体。对结构基元层层间的静电作用势能  相似文献