Modes of Occurrence and Geological Origin of Beryllium in Coals from the Pu'an Coalfield, Guizhou, Southwest China     

YANG Jianye Department of Materials  Xi'an University of Science  Technology  Xi'an  Shaanxi 《《地质学报》英文版》2007,81(3)

The concentration, modes of occurrence and geological origin of beryllium in five workable coal beds from the Pu'an Coalfield of Guizhou were studied using the inductively coupled-plasma mass spectrometry (ICP-MS), floating and sinking experiments (FSE) and sequential chemical extraction procedures (SCEP). The results show that the average concentration of beryllium in coals from the Pu'an Coalfield is 1.54μg/g, much lower than that in most Chinese and worldwide coals. Beryllium in the Pu'an coals was not significantly enriched. However, it should be noted that the No. 8 coal bed from the study area has a high concentration of beryllium, 6.89μg/g, three times higher than the background value of beryllium in coal. Beryllium in coal mainly occurs as organic association and has predominantly originated from coal-forming plants when its concentration is relatively low. The concentration of beryllium occurring as organic association is close to that distributed in inorganic matter when beryllium concentration of coal is similar to its background value, and in addition to coal-forming plants, beryllium is mainly derived from detrital materials of terrigenous origin. When beryllium is anomalously enriched in coal, it mainly occurs as organic association and is derived from volcanic tonsteins leached for a long geological time and then adsorbed by organic matter in peat mire.  相似文献   

电子探针对含Be矿物绿柱石的定量分析     

赵同新  陈文迪  殷婷  龚沿东  孙友宝  黄涛宏 《矿物学报》2020,40(2):169-175

绿柱石是最常见的含有超轻元素Be的硅酸盐矿物,其准确定量测试一直是电子探针微束分析领域的一大难点。本文总结了超轻元素微区测试的特点和难点,使用电子探针并结合全元素测试的思路对含Be矿物绿柱石进行微区化学成分分析,获得了令人满意的结果。结果同时表明,全元素测试方法可用于硅酸盐矿物中氧元素测试。此外,应用此方法对于含水或是变价元素矿物可得到更为理想的元素定量结果。  相似文献   

福建霞浦大湾铍钼矿床地质特征及成因初探   总被引：3，自引：0，他引：3  

杨武平 《福建地质》2008,27(1):1-7

霞浦大湾铍钼矿体主要产于晚侏罗世南园群鹅宅组与赤水组火山碎屑岩接触带附近的裂隙带中,辉钼矿石英脉呈脉状、铍矿体呈似层状分布在脉状辉钼矿体两侧,围岩蚀变具水平分带和垂直分带特征,以中-高温面状蚀变为主,成矿作用与岩浆活动和裂隙构造关系密切,属中-高温热液充填-交代型铍钼矿床,成矿时代为晚侏罗世。  相似文献   

Beryllium geochemistry in soils: evaluation of Be/Be ratios in authigenic minerals as a basis for age models     

E. Barg  D. Lal  M. J. Pavich  M. W. Caffee  J. R. Southon 《Chemical Geology》1997,140(3-4):237-258

Soils contain a diverse and complex set of chemicals and minerals. Being an ‘open system’, both in the chemical and nuclear sense, soils have defied quantitative nuclear dating. However, based on the published studies of the cosmogenic atmospheric ¹⁰Be in soils, its relatively long half-life (1.5 Ma), and the fact that ¹⁰Be gets quickly incorporated in most soil minerals, this radionuclide appears to be potentially the most useful for soil dating. We therefore studied the natural variations in the specific activities of ¹⁰Be with respect to the isotope ⁹Be in mineral phases in eight profiles of diverse soils from temperate to tropical climatic regimes and evaluated the implications of the data for determining the time of formation of soil minerals, following an earlier suggestion [Lal et al., 1991. Development of cosmogenic nuclear methods for the study of soil erosion and formation rates. Current Sci. 61, 636–639.]. We find that the ¹⁰Be/⁹Be ratios in both bulk soils and in the authigenic mineral phases are confined within a narrower range than in ¹⁰Be concentrations. Also, the highest ¹⁰Be/⁹Be ratios in authigenic minerals are observed at the soil-rock interface as predicted by the model. We present model ¹⁰Be/⁹Be ages of the B-horizon and the corresponding soil formation rates for several soil profiles. The present study demonstrates that the ¹⁰Be/⁹Be ratios in the authigenic phases, e.g. clay and Fe-hydroxides, can indeed be used for obtaining useful model ages for soils younger than 10–15 Ma. However, the present work has to be pushed considerably further, to take into account more realistic age models in which, for instance, downward transport ¹⁰Be and clays, and in-situ dissolution of clay minerals at depths, altering the ¹⁰Be/⁹Be ratios of the acidic solutions, are included. We show that in the case of younger soils (< 1 Ma) studied here, their ¹⁰Be inventories and ¹⁰Be/⁹Be ratios have been significantly disturbed possibly by mixing with transported soils.  相似文献   

P204萃淋树脂反相萃取色谱分离富集光度法测定岩石矿物中痕量铍   总被引：1，自引：0，他引：1  

裴世桥  朱玉伦 《岩矿测试》1993,12(2):113-116

研究了国产P204萃淋树脂反相萃取色谱分离富集岩石矿物中的痕量铍。在EDTA-Zn和H_2O_2存在下,上柱分离Fe、Ti、Al以及大量其它常见元素,再用5mol/L HCl洗脱Be后进行测定。方法用地质标准物质分析验证,其结果与推荐值吻合,对含Be为0.0092％的硅酸盐岩石样品进行7次平行分析,(?)=0.0091％,RSD=5.4％。  相似文献   

刚玉的铍扩散处理实验研究     

帅长春  薛秦芳 《地质科学译丛》2009,(3):30-33

铍扩散处理是一种较新的刚玉处理方法,目前在国内还未见相关的实验研究报道。运用类质同象替代原理与扩散原理,以焰熔法合成无色刚玉和山东天然蓝宝石为实验对象,在一定的温度环境下,加入适量的BeO或金属Be粉末及其它添加剂,进行了铍扩散处理实验。实验结果显示,样品的颜色色调及浓度有明显的改善,表明铍扩散处理可以使样品的颜色变为粉红色、黄色和橙红色,也可以使山东天然蓝宝石样品的颜色变浅。  相似文献   

The use of short‐lived radionuclides to quantify transitional bed material transport in a regulated river     

Nira L. Salant  Carl E. Renshaw  Francis J. Magilligan  James M. Kaste  Keith H. Nislow  Arjun M. Heimsath 《地球表面变化过程与地形》2007,32(4):509-524

We investigate the use of the short‐lived fallout radionuclide beryllium‐7 (⁷Be; t_1/2 = 53·4 days) as a tracer of medium and coarse sand (0·25–2 mm), which transitions between transport in suspension and as bed load, and evaluate the effects of impoundment on seasonal and spatial variations in bed sedimentation. We measure ⁷Be activities in approximately monthly samples from point bar and streambed sediments in one unregulated and one regulated stream. In the regulated stream our sampling spanned an array of flow and management conditions during the annual transition from flood control in the winter and early spring to run‐of‐the‐river operation from late spring to autumn. Sediment stored behind the dam during the winter quickly became depleted in ⁷Be activity. This resulted in a pulse of ‘dead’ sediment released when the dam gates were opened in the spring which could be tracked as it moved downstream. Measured average sediment transport velocities (30–80 metres per day (m d^?1)) exceed those typically reported for bulk bed load transport and are remarkably constant across varied flow regimes, possibly due to corresponding changes in bed sand fraction. Results also show that the length scale of the downstream impact of dam management on sediment transport is short (c. 1 km); beyond this distance the sediment trapped by the dam is replaced by new sediment from tributaries and other downstream sources. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

中国铍矿成矿规律   总被引：23，自引：10，他引：13  

李建康  邹天人  王登红  丁欣 《矿床地质》2017,36(4):951-978

中国是世界铍资源大国,本次工作统计到中国铍资源产地241处。铍矿床可分为内生型和外生型。根据岩浆系统的碱铝属性,内生铍矿床可分属于过铝性、偏铝性、过碱性成矿系统;根据流体演化阶段,再分为岩浆型、伟晶岩型、岩浆热液型等3个类型;然后根据赋矿环境进一步分为伟晶岩型、花岗岩型、石英脉型、矽卡岩型、云英岩型等多个矿化形式。过铝性系统的矿石矿物主要为绿柱石;偏铝性系统的矿石矿物主要为硅铍石、羟硅铍石、日光榴石等;碱性系统的矿石矿物主要为硅铍钠石、斜方板晶石、硅钡铍矿、硅铍石、羟硅铍石、硅铍钇矿等。不同赋矿环境产生不同类型的铍矿床,对应不同的矿物组合、矿化分带、矿石结构。统计结果表明,中国铍矿床主要产于过铝性的成矿系统,偏铝性、碱性成矿系统的铍矿床较少。多数铍矿床形成于中生代,主要产于新疆阿尔泰、川西、南岭等成矿带。碱性成矿系统的铍矿床多分布在板块边缘的深断裂或裂谷,过铝性成矿系统的铍矿床主要形成于褶皱造山带,具有一定的定向分布特征。过铝性-偏铝性成矿系统的铍成矿作用可用表示不同岩浆演化阶段和成矿环境的成矿模型描述。笔者建议:在阿尔泰和川西成矿带,重点考虑花岗伟晶岩型锂铍铌钽资源的综合找矿工作;在华南地区,注意与钨锡共(伴)生的铍资源的综合利用;着重在地质找矿和科研工作程度较低的地区,包括在东南沿海、大兴安岭地区寻找火山岩型和岩浆热液型铍矿床;加大西部铍资源空白区的找矿工作。  相似文献   

云南省铍矿床成矿规律初探     

张传昱  曹晓民  李文昌  唐忠  余海军  陈曹军  程涌  李蓉 《岩石矿物学杂志》2021,40(2):452-464

云南省铍矿床主要类型为伟晶岩型、岩浆热液脉型、蚀变花岗岩型和云英岩型等4类,其中,以前3类最为重要,占云南省铍资源总量的95％以上.铍矿床在成因上与壳源高分异花岗岩关系紧密,空间上主要分布在滇东南个旧、都龙地区和滇西高黎贡山、香格里拉地区.矿床的形成时代在滇东南地区为晚白垩世,在滇西地区为渐新世.滇东南铍成矿作用是对燕...  相似文献