Ge/Si and Sr/Sr tracers of weathering reactions and hydrologic pathways in a tropical granitoid system

Ge/Si and ⁸⁷Sr/⁸⁶Sr data from primary and secondary minerals, soil waters, and stream waters in a tropical granitoid catchment quantitatively reflect mineral alteration reactions that occur at different levels within the bedrock–saprolite–soil zone. Near the bedrock–saprolite interface, plagioclase to kaolinite reaction yields low Ge/Si and 87Sr/86Sr. Higher in the regolith column, biotite weathering and kaolinite dissolution drive Ge/Si and 87Sr/86Sr to high values. Data from streams at base flow sample the bedrock–saprolite interface zone, while at high discharge solutes are derived from upper saprolite–soil zone. Coupled Ge/Si and 87Sr/86Sr can be effective tools for quantifying the importance of specific weathering reactions, and for geochemical hydrograph separation.     

东昆仑东段钴矿地质特征及潜力浅析

东昆仑东段的钴矿床类型主要有喷流沉积型、矽卡岩型等。通过对典型矿床控矿条件的分析，认为钴矿的形成受含矿岩性、深大断裂构造以及提供成矿热液和矿源的岩体等多种因素控制。该地区寻找钴矿具有良好的前景，找矿潜力巨大。     

Chemical Characterisation of Chromites by XRF Spectrometry

The present study was undertaken to establish and validate a methodology for determining the chemical composition of chromite ores, as no detailed information could be found in the literature. Chromite ores from South Africa, Kazajistan and Mongolia were analysed. X-ray fluorescence (XRF) spectrometry was used for chemical characterisation. Sample preparation in the form of fused beads was optimised in terms of sample:flux ratio, type of flux, type of release agent, fusion temperature and time. Calibration and validation samples were prepared from mixtures of reference materials. The proposed methodology was then used in an interlaboratory test for preparing a new chromite-rich reference material.
L'analyse présentée id a été entreprise afin d'établir et de valider une méthodologie pour déterminer la composition chimique de minerals de chromite, car aucune information détaillée là dessus ne pouvait etre trouvée dans la littérature. Des minerals de chromite d'Afrique du Sud, du Kazakhstan et de Mongolie ont été analysés par spectrométrie de Fluorescence de Rayons X (XRF) afin d'être caractérisés chimiquement. La préparation des échantillons afin d'obtenir des perles fondues a été optimisée en termes du rapport "échantillon/fondant", type de fondant, d'agent mouillant, température et durée de fusion. La calibration et la validation ont été faites à partir de mixtures de matériau de référence. La méthodologie proposée a été ensuite appliquée à un test d'inter-comparaison en vue de préparer un nouveau matériau de référence riche en chromite .     

Experimental study on the interaction between peat, lignite and germanium-bearing solution at low temperature

Since Goldschmidt discovered unexpectedly high concentration of Ge in coal in 1930[1], many research- ers have studied the characteristics of Ge-bearing coal, the existing form or mode of occurrence and the dis- tribution characteristics of Ge in coal[2―13], but little was known about the pathway and the physical- chemical conditions of Ge entering the coal[7]. Al- though Ge exists mainly in the organic form in coal[8,9], the organic Ge in natural water is stable and does not participate in…     

张家湾矿石的工艺矿物学及可选性研究

通过对张家湾矿体进行矿石的工艺矿物学及可选性研究，查明了矿石的物质组成和嵌布特征，确定了矿石的可选性及开采价值，为鞍山矿业公司提供了新的开采资源。     

东大滩锑金矿微生物预氧化提金试验研究

介绍了东大滩难浸金矿石微生物预氧化的方法及结果。东大滩石英脉型锑金矿石因金被毒砂包裹而难浸，采用微生物预氧化处理后全泥氰化金的浸出率由原来的17．04％提高到70．80％，柱浸由15．39％提高到63．02％，且酸耗较低，各项指标合理，是解决该类矿石难浸的理想方法。     

Determination of the "Difficult" Elements Ag, B, Ge, Mo, Sn, Tl and W in Geochemical Reference Samples and Silicate Rocks of the GeoPT Proficiency Testing Series by DC Arc Atomic Emission Spectrometry

Reference samples of rocks from the Institute of Geochemistry, Irkutsk (IGI) and the Research Institute of Applied Physics, Irkutsk University (RIAP) and silicate rocks from the GeoPT proficiency testing series were analysed with the aim of determining Ag, B, Ge, Mo, Sn, Tl and W abundances by an atomic-emission method with air-stabilized D.C. arc excitation. Many of the results reported are without recommended or assigned values. The results are compared with compilation data from the literature and, where possible, with assigned values for samples of the Geo PT series.     

贵州省丹寨县四相厂难选汞金矿回收黄金工艺流程研究

介绍了从贵州省丹寨四相厂难选汞金矿中回收黄金合理工艺流程的研究，对研究中的几个关键问题进行了详细论述。     

黔东北地区优质锰矿找矿进展与前景展望

黔东北地区优质锰矿产于早震旦世大塘坡早期黑色岩系底部，位于普通锰矿－菱锰矿层的下部。作者在论述区内锰矿成矿的岩相古地理、古构造、成锰盆地特征的基础上，对优质锰矿的分布产出规律进行了分析和论述，并对区内优质锰的潜力进行了评估，可望成为我国重要的优质锰矿勘查开发基地。     

络合滴定铁矿中铝的新指示剂

在ＰＨ４．５－６．５条件下，Ｚｎ与３，５－ｄｉＢｒ－ＰＡＤＡＰ及ＳＤＳ形成可溶性紫红色络合物，利用此体系以３，５－ｄｉＢｒ－ＰＡＤＡＰ为指示剂，锌盐回滴法测定铁矿中的Ａｌ２Ｏ３溶液颜色由亮黄变为紫红，络点突跃敏锐，Ｆｅ＾３＋的黄色不影响终点观察。