新疆伊吾县北山金矿床主要特征及其扩大找矿前景

北山金矿区成矿地质条件十分有利，矿区内与华力西晚期中酸性浅成岩浆建造有关的蚀变、矿化广泛发育，矿区东部与中酸性浅成岩浆建造有关的脉状蚀变岩型金矿化已达小型矿床规模．通过在矿区开展的综合物化探快速评价工作，在矿区西部发现了面积达2km^2，作SN向展布的大规模面型高相位电性异常，其峰值达47mrad，一般均在15mrad以上。同时在电性异常之上叠加有Au，As和Sb的面型化探异常。结合区内金矿与中酸性浅成岩浆建造密切相关的事实，表明矿区西部很可能存在寻找次火山斑岩型隐状—半隐状金矿的潜在远景。     

离子束辅助沉积铌提高铀的抗腐蚀性能研究

利用离子注入技术在铀表面进行了离子束辅助沉积铌和离子注入铌形成表面改性层，并对改性层的厚度、注入元素的分布进行俄歇电子能谱（AES）分析和表面相及结构的X射线衍射谱（XRD）分析，用电化学极化法测试抗腐蚀性能。结果表明：离子束辅助沉积表面改性层比离子注入表面改性层明显增厚，铀的耐蚀性得到进一步改善。最后讨论了注铌改性层耐蚀性提高的原因。     

土壤样品的微波消解及其痕量铀的分析

对3个土壤样和2个放射性河床沉积物的国家标准物质进行了微波消解，又采用TOPO萃取和液体荧光法分析了样品中的铀含量，并将分析结果与国家标准方法GB11220．2-89的分析结果进行了比较。结果表明，微波消解法与国家标准方法一样，均不能实现土壤的全部消解，但与国家标准方法相比较，微波消解速度快，所需试剂量少，且易于实现定量控制，铀回收率高，分析精度高。对不溶物进行X射线能谱分析发现，其主要组成为铝、钛及过渡金属的氟化物或氧化物。同位素质谱分析表明，国家标准物质GBW08304中的^234U，^235U均比天然丰度低，另一个国家标准物质GBW08304a中铀的同位素分布与天然组成基本一致。     

精脒含量对浓缩铀诱发PCI2细胞凋亡的影响

研究PC12细胞内精脒含量在浓缩铀诱导细胞凋亡中的作用。在PC12细胞中加入浓缩铀DMEM/F12工作液,计算PC12细胞的内照射吸收剂量,运用丹磺酰氯薄层分析技术测定细胞内游离精脒含量。结果表明,随着浓缩铀内照射时间的延长,细胞增殖活性迅速下降,DNA链断裂明显增多,放射性核素迅速渗入细胞核中,AO/EB染色可见凋亡细胞,同时细胞内游离精眯随内照射时程的延长而显著减少。表明浓缩铀可致PC12细胞的凋亡,细胞内游离精脒的含量可能与细胞活性有一定作用。     

帕莉莱矿床现代表生铀成矿作用及其对砂岩铀矿找矿工作的启示

本文讨论了加拿大帕莉莱(Prajrie Flats)矿床现代表生铀成矿作用特点，认为表生环境下，砂、砾沉积体中基本不存在铀的富集，而富集于细碎屑沉积物中的铀是不稳定的，在压实成岩过程中，解吸铀及部分吸附铀会逐渐迁移到附近的砂岩(体)内，对砂岩铀成矿起着重要的控制作用。根据帕莉莱矿床现代表生铀成矿作用特点，提出半干旱或干湿型古气候环境下形成的杂色建造可发生铀的沉积成岩预富集，并是砂岩铀矿的重要含矿建造之一。     

砂岩型铀矿弱信息提取及综合评价方法技术研究

砂岩型铀矿弱信息提取及综合评价技术是当前铀矿勘查中的重要研究内容之一。通过近几年的研究，提出了航磁、航放弱信息提取的内涵，研究了航磁、航放弱信息形成理论，建立了有效的弱信息提取数学模型；基于GIS软件，实现了弱信息提取模型，并开发了专家打分综合评价模型。在某地区，应用GIS软件完成了航磁、航放弱信息提取试验和铀资源综合评价。研究结果表明，弱信息提取和综合评价技术可快速缩小砂岩型铀矿找矿靶区，提高预测精度。     

预处理啤酒酵母菌对铀的吸附研究

对啤酒酵母菌进行预处理，期望增加其吸附铀的能力。介绍了各种酸、碱、有机物等对啤酒酵母菌预处理的影响，讨论了NaHCO3浓度、吸附时间等条件对处理前、后的啤酒酵母菌吸附铀的影响。结果表明，啤酒酵母菌用0．1mol／LNaHCO3。预处理后，其吸附铀的能力显著增加，最大吸附量约为238mg／g，而未处理时的最大吸附量为196．1mg／g。     

Daughter minerals in fluid inclusions of garnet and diopside from Tongguanshan Copper Deposit by SEM／EDS and LRM

Tongguanshan copper deposit of Tongling large ore belt is one of the typical skarn copper deposits. Based on careful observation under microscope many daughter minerals including transparent ones and opaque ones have been distinguished in the fluid inclusions of garnet and diopside. The results of SEM/EDS (scanning electron microscope/energy dispersive spectrometer) and LRM (laser Raman microprobe) analysis show that these daughter minerals in garnet are sylvite, halite, sphalerite, chalcopyrite and carbonate. Sylvite daughter mineral is very popular in garnet and diopside. The existence of so much sylvite daughter mineral and other daughter minerals in the fluid inclusions indicates that the ore-forming fluid is of supper-high salinity and high potassium concentration. High potassium concentration in the fluid inclusions agrees with K-rich mesotype-acid rock and K-silicate alteration that occurred widely in this area. The daughter mineral assemblage in garnet and diopside is similar to the mineral assemblage of oreforming stage that followed skarn stage.     

缅甸高林—文多地区金矿床地质特征与成因分析

高林-文多地区是缅甸中央火山弧带上金矿的集中产出区域,通过对高林-文多地区典型矿床介绍,总结出该区金矿化主要赋存于安山岩、闪长岩、花岗岩以及砂岩中,受NE-NNE向断裂以及NW向断裂控制明显,岩浆期后的热液活动与金矿化密切相关。矿床类型从西向东依次为蚀变岩型→石英脉-蚀变岩型→石英脉型的分带特点,反映了不同构造层次、不同岩性介质是确定矿床类型的重要因素。金矿体的形成在收缩挤压到旋转走滑的构造转换的背景下,岩浆活动萃取围岩中流体,在构造有利位置富集成矿。     

Uranium (IV)-(VI) Electron Exchange Reactions in Anion Exchange Resin,Tri-n-Octyl Amine and Tri-Butyl Phosphate

A study has been made of the U(IV)-U(VI) electron exchange reactions taking place between natural U(IV) and depleted U(VI) in anion exchange resin, as well as in TnOA/benzene and TBP/benzene systems.

The exchange rate in the anion exchange resin was smaller than the corresponding rates in 8–10 M HCl, which might be explained by considering that the diffusion of the exchangeable species is much slower in the anion exchange resin than in 8–10 M HCl.

The exchange rates in TnOA/benzene and in TBP/benzene were accelerated by decreasing the concentration of TnOA or TBP in benzene. The reason may be that TnOA and TBP, including the exchangeable species, is more easily diffused in dilute than in concentrated solution.

Based on activation energy values, the mechanism of exchange in the anion exchange resin was estimated to be similar to that in 8–10 M HCl solution, and the corresponding mechanism for TBP/benzene similar to that for the cation exchange resin. In the case of TnOA/benzene, the exchange process was presumed to resemble that of the anion exchange resin, judging from the similarity of ionic species extracted thereinto.