化探找金·银的新方法——螯合吸附剂偏提取法

提出了一种化探找金、银的新方法,该法采用一种混合浸取剂,以螯合吸附剂对采集到的化探次生晕样品进行偏提取.对偏提取的金、银含量,利用液珠萃取比色法进行金、银含量测定,从而达到化探直接找金、银的目的.该法克服了化探找金工作中的“粒金效应”.该设备简单、易操作.     

四川三种类型金矿的异常特征及化探找金工作方法讨论

本文拟介绍四川三种类型金矿的特征元素组合和它们的分散流异常特征;化探找金方法试验结果;并对化探找金的工作方法提出一些粗浅看法. 试验工作所采样品,用发射光谱半定量分析方法测定Cu、Ag、Pb、Zn、Ni、Cr、Co、V、Ti、Mn、Mo、B、Ba、Bi、Sn,用硫代米蚩酮(TMK)比色法测定Au,结晶紫比色法测定Sb、斑点法测定As,以及用F 73-2测汞仪测定Hg.     

泡塑富集-石墨炉原子吸收光谱法测定痕量金

介绍在Fe3 存在下,用泡沫塑料分离富集,以抗坏血酸和硝酸铵为基体改进剂,采用斜坡升温和长寿命石墨管技术进行化探样品中痕量金的石墨炉原子吸收光谱法测定方法。该方法已应用于化探样品中金的分析工作中,取得了令人满意的结果。     

四川几类金矿的元素组合、异常特征及化探找金工作方法试验与讨论

近三年来,作者参与了化探找金的方法试验工作,本着“总结、提高”的精神,写成此文,以供同志们参考。 文中介绍了四川四种类型金矿的特征元素组合和它们的分散流异常特征;化探找金方法试验结果;进而对化探找金的工作方法提出了一些粗浅看法。 所采样品用发射光谱半定量分析方法测定Cu、Ag、Pb、Zn、Ni、Cr、Co、V、Ti、Mn、Mo、B、Ba、Bi、Sn,用化学光谱法测定Au,结晶紫比色法测定Sb,斑点     

金、银矿产普查中化探应用的效果及若干问题的讨论

本文讨论了金、银矿产普查中应用化探的找矿效果和方法使用中的一些问题。文章主要简介了1980～1985年期间化探方法找金、银矿产所取得的找矿成果,新发现59处矿床和矿产地。指出了在中国的地理一地质条件下,寻找金、银矿必须首先开展小比例尺的区域化探,以便尽快缩小找矿靶区,圈出成矿远景区,然后进行普、详查工作,才能很快取得重大找矿成果,同时也会缩短找矿周期和节约经费。还讨论了开展区域、普查和详查化探各阶段的工作任务,在1:20万区域化探和1:5万普查化探阶段主要应选用水系沉积物测量。在大比例尺详查中主要选用土壤测量或岩石测量。讨论了在普、详查中进行组合样品的问题。同时也指出承担金、银矿化探普查的野外队必须掌握痕量金分析方法和技术及形成生产能力的重要性。     

Z-2700石墨炉原子吸收测定化探样品中痕量金

本文采用泡塑富集化探样品中痕量金,用石墨炉原子吸收法测定痕量金。试样经灼烧,王水密封溶矿,泡塑富集,硫脲解脱等过程进行了改进及条件控制,该方法具有检出限低,灵敏度高,操作简便,速度快,劳动强度小,适用地质化探样品中痕量金的测定。     

泡塑富集-硫代米蚩酮萃取微珠比色法在野外测金的应用

在野外交通不便和无电力条件下，应用泡塑富集-硫代米蚩酮微珠萃取比色法，实现了5～1200ng/g金的测定，结果与室内化学光谱法比较，无明金样品的相对误差可控制在60％以内，含明金样品的相对误差基本在100％～500％，可以满足化探找金及异常查证的要求。方法能有效地指导化探找金工作。     

氯化钠—硝酸溶矿—化学光谱法测定化探样品中的痕量金

化探样品经灼烧去除易挥发组及有机物后，用硝酸和氯化钠分解，活性炭吸附柱分离富集，采用发射光谱分析法测定金。方法的检出限为0.25ng/g。用化探金标准物质进行测定，其结果与标准值相符，在允许误范围之内，标准物质平行测定15次的相对标准偏差为14.4%。     

石墨炉原子吸收法测定微量金的探讨

本文研究了样品中泡沫塑料吸附金,使用AAS ZEEnit650石墨炉原子吸收光谱仪分析测定微量金,提供了快速准确分析化探样品中微量金的含量的方法。本方法对国家一级标准物质进行测定,测定结果的相对标准偏差为(n=10),适合大批量微量金的测定。     

金的相态分析

发展了化探样品（主要为疏松沉积物）中金的相态分析方法。将化探样品中金划分为：水提取相、吸附相、有机相、铁锰氧化物相、碳酸盐相、硫化物相、石英结合相、自然金八个相态。这一划分为在不同景观区金的地球化学找矿提供了新的手段。列出了部分金相态分析结果,８个相态金的加和与金总量分析结果基本相符;对１７个样品的四个相态进行了测定,ＲＳＤ（ｎ＝５）分别为：１０．５％～３０．０％（水提取相）;１３．６％～２４．４     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H₂O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H₂O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931.     

PALEONTOLOGY

正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.)     

GEOCHEMICAL EXPLORATION

正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.)     

MICROPALAEONTOLOGY

正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.)     

PETROLOGY

正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus.,     

ENVIRONMENTAL GEOLOGY

正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an