荣成大疃刘家铍矿矿物赋存状态   总被引：1，自引：0，他引：1       下载免费PDF全文

孙绪德  尹升  张海芳 《山东国土资源》2014,30(6)

大疃刘家铍矿铍元素主要以羟硅铍石单矿物赋存在矿石中。以羟硅铍石单矿物存在的BeO占79.45%;少部分分散在其他矿物中,以赤铁矿、褐铁矿中BeO含量较高,其次是绢云母、重晶石等。BeO呈分散状态占20.55%,主要集中在绢云母中,这是由于矿石中绢云母含量高所致,分散状态的BeO无法回收。根据矿石中有用矿物和脉石矿物组合,矿石类型为羟硅铍石-绢云母-碳酸盐岩-长石-石英型铍矿石。  相似文献   

Sea-bed Mixing and Particle Residence Times in Biologically and Physically Dominated Estuarine Systems: a Comparison of Lower Chesapeake Bay and the York River Subestuary     

T.M. Dellapenna  S.A. Kuehl  L.C. Schaffner 《Estuarine, Coastal and Shelf Science》1998,46(6):777-795

Biologically dominated lower Chesapeake Bay and the physically dominated York River subestuary are contrasted in terms of the dynamics of sediment mixing, strata formation and sea-bed particle residence times. Two lower bay sites were examined; both are located within the bay stem plains and are characterized by muddy sand and an abundance of large, deep-dwelling organisms. X-radiographs indicate extensive biological reworking of sediments, with no long-term preservation of physical stratification.²¹⁰Pb profiles reveal low sediment accumulation rates at both lower bay sites (<0·1 cm year⁻¹), but significant differences in biological mixing depths (25vs40 cm) and biodiffusivity (>80vs6–30 cm²year⁻¹). In contrast, the York River site, located within a partially-filled palaeochannel, is predominantly mud with a depauperate benthic community dominated by small, short-lived, shallow-dwelling organisms. Although²¹⁰Pb accumulation rates at the York River site (<0·2 cm year⁻¹) are similar to those measured in the lower bay, there is little bioturbation. In addition, transient bed forms at the York River site form laterally persistent, linear ridges and furrows sub-parallel to the channel, spaced 10–20 m apart. These observations, coupled with evidence of episodic erosion and deposition from radioisotope and porosity profiles, and X-radiographs, suggest that the upper 60–120 cm of the sea-bed are dominated by physical mixing. Deep mixing and low accumulation rates result in long residence times of particles in the mixed upper portion of the sea-bed (10²year) at both locations, despite different mixing controls [i.e. biological (diffusive)vsphysical (advective)].  相似文献   

我国锂铍钽矿床调查研究进展及相关问题简述   总被引：4，自引：3，他引：1       下载免费PDF全文

王登红  王成辉  孙艳  李建康  刘善宝  饶魁元 《中国地质调查》2017,4(5):1-8

稀有金属是极重要的战略性矿产资源,尤其是高端装备制造业、新能源汽车等新兴产业的发展对其需要量的日益增加,带动了该领域找矿工作取得了一系列新进展。锂、铍、钽是当前最受关注的稀有金属,迄今,我国对于锂等稀有金属成矿机制的研究还不够深入且争论不断。在多年实践的基础上,该文对于锂矿的成矿机制提出了“多旋回深循环内外生一体化”的新认识,并以此拓展了“五层楼+地下室”的勘查模型,进而指导四川可尔因伟晶岩矿田、甲基卡矿田及湘鄂赣交界地区的幕阜山-九岭矿集区、中央造山带的秦巴山区等地在寻找伟晶岩型锂辉石矿床、花岗岩体型锂铍铌钽矿床及层控热液型铍矿床等方面取得新进展,指出了新方向,有助于打开稀有金属找矿的新局面。  相似文献   

2，4－二甲氧基苯基荧光酮光度法测定铍     

韩峭峰  杨问华  侯安新  陈晓明  陈伟 《岩矿测试》1994,(4):302-304

２，４－二甲氧基苯基荧光酮光度法测定铍韩峭峰，杨问华，侯安新，陈晓明，陈伟中国地质大学化学系汉口４３００３０２，４－二甲氧基苯基荧光酮（ＤＭＰＦ）已用于分光光度法测定微量Ｃｏ￣［１］、Ａｌ￣［２］及化学发光法测定Ｃｏ￣［３］。本试验在ＣＴＭＡＢ存在下...  相似文献   

微波诱导等离子体原子发射光谱法测定铍铬钼钒锆锗的研究   总被引：1，自引：0，他引：1  

张晓惠  侯明轶 《岩矿测试》1992,11(3):221-224

研究了用微波诱导等离子体原子发射光谱法(MIP-AES)测定Be、Cr、Mo、V、Zr和Ge。确定了最佳实验条件,其检出限分别为:0.038,0.030,0.015,0.030,0.024和0.11μg/ml。对实际样品进行了测定,结果令人满意。  相似文献   

发射光谱法测定碳酸盐岩石样品中8个痕量元素   总被引：4，自引：3，他引：4  

张文华  张芳 《岩矿测试》1995,14(1):37-40

文章报道了用于测定碳酸盐岩石样品中痕量Ｂｅ，Ｂ，Ｓｎ，Ａｇ，Ｍｏ，Ｃｕ，Ｐｂ和Ｇａ的交流电弧光谱定量分析方法，研究了多种缓冲剂的缓冲效果和分馏效应，选择了最佳工作电流，电极规格和内元素。方法检出限为０．０４～２．８μｇ／ｇ精密度ＲＳＤ（ｎ＝１０）在５．２％～９．９％，经国家一极碳酸盐岩石标样和批量岩石样分析均获满意结果，方法能满足区域化探要求。  相似文献   

Characterization of the binding sites for Al(III) and Be(II) in a sample of marine fulvic acids     

Joaquim C. G. Esteves da Silva  Adlio A. S. C. Machado 《Marine Chemistry》1996,54(3-4)

A sample of coastal marine fulvic acids (mfua) was studied and its binding site structures that form stable complexes with metal ions were identified. A previously developed self-modeling methodology, based on the coupling of synchronous fluorescence (SyF) spectroscopy with evolving factor analysis (EFA), was used for the analysis of the interactions between mfua and two metal ions that act as probes for binding sites, namely Be(II) and Al(III). Two types of binding site structures were detected, probably of the salicylic acid and catechol types. The values of the conditional stability constants between mfua and the two metal ions were: for Be(II), at pH = 6, log K = 5.32(8); for Al(III), at pH = 4, log K = 5.1(2). The concentration of the corresponding binding sites was found to be less than one half of those found for soil fulvic acid samples.  相似文献   

Regional and Global Tropopause Fold Occurrence and Related Ozone Flux Across the Tropopause     

M. Beekmann  G. Ancellet  S. Blonsky  D. De Muer  A. Ebel  H. Elbern  J. Hendricks  J. Kowol  C. Mancier  R. Sladkovic  H. G. J. Smit  P. Speth  T. Trickl  Ph. Van Haver 《Journal of Atmospheric Chemistry》1997,28(1-3):29-44

This paper gives a synthesis of three algorithms to detect the presenceof tropopause folds from vertical ozone/radio-sounding profiles and frommeteorological analysis. Also an algorithm to identify injection ofstratospheric air into the lower troposphere fromozone/⁷beryllium time series is presented. Differences in theresults obtained from the algorithms are observed and discussed with respectto the criteria for fold detection and input data used. Spatial gradients inthe obtained folding frequencies are made evident on a global scale from thealgorithm based on meteorological analysis (Q-vector/potential vorticity)and probably also on a regional European scale from algorithms both basedmeteorological analyses and on ozone/PTU soundings. The observed seasonalvariation of folding occurrence is rather flat except during summer whenalso some differences appear between the algorithms. By combining thefolding frequencies with literature estimates of the cross-tropopause ozonetransfer in single folding events, an average stratospheric ozone influxinto the troposphere of 5.7 ± 1.3× 10¹⁰ mol.cm^-2 s^-1 is obtained for the Northern hemisphereand 12± 2.7× 10¹⁰ mol. cm^-2s^-1 for Western Europe. Potential additional contributions dueto other stratosphere-troposphere exchange processes than folds are not yetincluded in these estimates. Finally, the link between statistics fromozone/⁷beryllium data and folding statistics is brieflydiscussed.  相似文献   

西藏中冈底斯成矿带中段铍矿化体的发现与意义          下载免费PDF全文

李应栩  黄永高  韩飞  严刚  杨学俊  李光明  宋旭波  杨青松 《沉积与特提斯地质》2018,38(4):62-67

经过初步工作,在西藏中冈底斯成矿带发现极具潜力的铍矿找矿线索。新发现的铍矿化体赋存在侵位于古生代地层的粗粒状和伟晶状二云母花岗岩中,岩体和岩脉即为矿化体,并与围岩具有截然的界线。围岩发育热液蚀变和热变质,包括角岩化、硅化、电气石化、石榴子石化、红柱石化、堇青石化等,但分带不甚明显,矿化体和围岩间还发育有"云母线"。矿化体罕见黑钨矿和锂辉石,萤石较少,主要为铌钽矿物和含铍矿物。这一新发现丰富了中冈底斯成矿带新矿种和新的矿床类型,对更加深入地认识冈底斯成矿带构造-岩浆演化与成矿作用、丰富和完善青藏高原南部碰撞造山与成矿理论有重要意义。  相似文献   

硝酸镧为基体改进剂石墨炉原子吸收光谱法测定煤样中的铍     

赵秀宏  王鑫焱  郭沛  刘彦春  姜雨杉 《岩矿测试》2015,34(1):60-66

应用石墨炉原子吸收光谱法(GFAAS)测定煤、地球化学样品、土壤、空气等不同基质中的铍,关键是基体改进剂的选择问题。本文采用一体化平台石墨管,通过缓慢升温燃烧灰化煤炭样品,在硝酸介质中,比较了7种基体改进剂(硝酸镧、硝酸镁、硝酸铝、磷酸氢二铵、氯化钯、碳酸钙、酒石酸)对煤样中铍的增敏效果,同时探讨了基体干扰及消除的问题。实验结果表明,在2%的硝酸介质中,以硝酸镧为基体改进剂,石墨炉灰化温度提高到1100℃,原子化温度仅为2300℃时,即可消除基体中铝、铁、钙、镁、磷等共存元素的干扰。铍的浓度在0~8μg/L范围内线性关系良好,方法检出限为0.008μg/g,定量限为0.025μg/g,精密度(RSD,n=11)为1.8%~2.8%,标准样品的测定值在给定值的误差范围内。其作用机理是镧与干扰元素结合生成了热稳定的难熔、难蒸发、难解离的化合物,将铍释放出来,镧起到既提高灰化温度,又相对降低原子化温度的双重作用,消除了基体干扰的同时,又延长了石墨管使用寿命。本方法操作简单,无需对石墨管预处理,降低了检测成本,具有很强的稳定性和适应性,适用于煤中铍的测定。  相似文献