内蒙白音诺等矿床中方铅矿中银的赋存形式及其与伴生元素锑、铋的关系

作者根据Ag2S-PbS, Ag2S-PbS-Sb23。及各休系相平衡资料以及内蒙白音诺等矿床 中各种矿物共生组合中方铅矿的成分，论证了银的赋存状态及其与伴生元素锑、秘的关系.在含 银及低温条件下.银在方铅矿中形成独立的银锑硫盐矿物，这有利于银的回收。在含秘低温条件 下，银在方铅矿中不可避免地有相当一部分呈固溶休的状态分散在晶格中，它不利于银的回收. 因此，只需研究银的赋存状态及矿石或方铅矿中伴生元素锑、秘含量及其比例，即可对铅精矿中 银的存在形式及回收率作出初步的评价。     

Green synthesis of iron oxide (Fe3O4) nanoparticles using two selected brown seaweeds: Characterization and application for lead bioremediation

The exploitation of different plant materials for the biosynthesis of nanoparticles is considered a green technology because it does not involve any harmful chemicals. In this study, iron oxide nanoparticles (Fe₃O₄-NPs) were synthesized using a completely green biosynthetic method by reduction of ferric chloride solution using brown seaweed water extracts. The two seaweeds Padina pavonica (Linnaeus) Thivy and Sargassum acinarium (Linnaeus) Setchell 1933 were used in this study. The algae extract was used as a reductant of FeCl₃ resulting in the phytosynthesis of Fe₃O₄-NPs. The phytogenic Fe₃O₄-NPs were characterized by surface plasmon band observed close to 402 nm and 415 nm; the obtained Fe₃O₄-NPs are in the particle sizes ranged from 10 to 19.5 nm and 21.6 to 27.4 nm for P. pavonica and S. acinarium, respectively. The strong signals of iron were reported in their corresponding EDX spectra. FTIR analyses revealed that sulphated polysaccharides are the main biomolecules in the algae extracts that do dual function of reducing the FeCl₃ and stabilizing the phytogenic Fe₃O₄-NPs. The biosynthesized Fe₃O₄-NPs were entrapped in calcium alginates beads and used in Pb adsorption experiments. The biosynthesized Fe₃O₄-NPs alginate beads via P. pavonica (Linnaeus) Thivy had high capacity for bioremoval of Pb (91%) while that of S. acinarium (Linnaeus) Setchell 1933 had a capacity of (78%) after 75 min. The values of the process parameters for the maximum Pb removal efficiency by Fe₃O₄-NPs alginate beads synthesized via P. pavonica (Linnaeus) Thivy were also estimated.     

陕西省银洞子银-铅多金属矿床外围铜矿成矿条件与找矿预测

银洞子银-铅多金属矿床位于秦岭泥盆系多金属成矿带中的柞水-山阳成矿区西部,是一个受多级断陷盆地控制的海底热水喷流沉积矿床,而这种矿床的成矿条件非常有利于铜的硫化物矿床的形成.根据矿床成矿元素分带特征,结合电阻率异常预测,矿床北部具有寻找大型-超大型铜矿体的远景.     

庞家沟银多金属矿地质特征及成因浅析

庞家沟银多金属矿床受断裂构造和岩性双重控制,其矿种及其成因在冀北地区具有代表性.从阐述庞家沟银多金属矿地质特征入手,分析、研究其矿床成因.结果认为,该矿床为燕山晚期热液矿床.     

豫西寨凹隐伏岩体对周边银多金属矿的控矿作用

总结了寨凹地区的地质背景、寨凹隐伏岩体的地球物理特征和成矿特征，探讨了该隐伏岩体对区内银多金属矿的控矿作用，建立了成矿模式并指出了找矿方向。     

广西岑溪市鸭坑银矿地质特征

岑溪市鸭坑银矿位于桂东南铅锌金银多金属成矿带北东段，产于下奥陶统上段含砾砂岩、泥岩的蚀变断裂破碎带中。在分析研究矿床地质背景、构造特征、矿石矿物特征及围岩蚀变特征的基础上，指出该矿床属蚀变构造岩型独立银矿，找矿标志主要是断裂构造、地球化学异常、围岩蚀变、民采遗迹标志等，提出在佛子冲外围寻找该类型银矿的找矿模式。     

Isotopic Characterisics and Key Factors Favoring the Formation of Fuwan Superlarge Silver Deposit in Guangdong Province

Rb-Sr isochron age of fluid inclusions in quartz from the Fuwan super-large silver deposit is 68±6 Ma, the silver deposit is characterized by high μ values (10.67-10.95), which are much higher than those of the ore-hosted Paleozoic strata and are close to those of ores hosted in the Proterozoic metamorphic basement in western Guangdong Province. Based on the Pb isotopic characteristics, coupled with much high background silver contents (200-1000 ng/g) in the Proterozoic basement and relatively low silver contents in the Paleozoic strata in the region of the Sanshui Basin, it is concluded that the ore-forming material of the super-large silver deposit came mainly from the old basement. The super-large silver deposit related genetically to the intense volcanic activities during the Upper Cretaceous to Eogene. The formation of the Fuwan super-large silver deposit is controlled by the following favorable geological conditions: (1) The intersection of deep faults and contemporaneous faults at the margin of the Sanshui Basin led to the formation of an excellent structure as passageway for ore fluids; (2) The special ore-hosted rock association forms a ore gathering-trap structure that favors the precipitation of ore; (3) The silver-rich old basement, multi-stage mineralization and multi-episode volcanic activities which constitute a geothermal convection system.     

La mine médiévale d'argent du Pontet,une fente alpine contemporaine de la surrection des massifs cristallins ?

This study of the Pontet mine aimed at updating the understanding of ore-structural geology setting and, in terms of archaeology, at pointing out how the geometry of structures influenced the medieval workings and the shape of the galleries. The mineralisation and the WNW–ESE dextral normal faults controlling its emplacement are assigned to the Eocene by analogy with the neighbouring La Gardette structure. This confirms the Late Eocene to Oligocene age classically proposed for Phase 1 and places it in the Eocene. The Prégentil-type P1 folds described by Lameyre (1958) are here attributed to Phase 1, which raises the question as to whether the contemporaneous tectonic uplift of the crystalline basement should also be assigned to Phase 1 rather than to Phase 2. To cite this article: J.-L. Feybesse et al., C. R. Geoscience 336 (2004).     

双最大吸收波长光度法测定天然水中的银

在乙酸介质中,银(Ag~+)亚铁氰化钾—邻菲啰啉反应有催化作用,体系由红色渐变为蓝绿色。据此,本文依据稳定悬浮体系光学吸收性质、研究双最大吸收波长以测定银的新方法。该方法将红色褪色和绿色生色双定量联系起来,分析灵敏度比单波长法提高1倍,而且操作较简单,精密度较高,计算曲线稳定,适合于天然水和部分较洁净污水中Ag的分析。     

浙东南金(银)矿的遥感影像地质模式

浙东南金银矿受矿源层和矿化层及其赋矿空间;岩浆、变质、火山一次火山热液作用;多期性的成矿以及不同矿化类型的形成条件;不同构造块体及其构造格局和控矿赋矿方式等的影响和控制,这种多源的特征可由遥感的影像地质特征表现出来,并构成浙东南金银矿成矿的遥感影像地质模式.