金的地球化学试样的采集与制备

近年来,许多冶金地质化探单位,在做金的分析时,遇到的一个突出问题是,野外供样量少、试样中金含量分布不匀与要求测定的金量极痕的矛盾.因此,如何能使金的地球化学试样的采集量、试样制备与基本满足测定要求的分析试样量三者合理的统一,乃是当前金的化探分析工作中亟待解决的问题. 在十多年前,当国外正大力开展金的地球化学勘查时,也曾遇到上述问题.有些化探工作者,对此进行调查、试验并作了报道,普遍认为金的化探试样采集重量、试样制备,以及送实验室试样的粒度与重量,是影响化探找金时合理评价的     

金矿样品测试分析工作中有关问题的探讨

本文阐述了金试样的加工处理以及金的分析测定等有关问题。     

1996年中国金分析测定的进展

综述了１９９６年中国金分析的最新进展，包括含金试样的加工处理、金的分离富集方法及各种分析测定方法。引文１１６篇。     

1998年中国金分析测定的进展

综述了１９９８年中国金分析测定的进展,内容有含金试样的加工处理,金的分离富集及各种测定方法。参考文献１０１篇。     

1997年中国金分析测定的进展

对１９９７年中国金分析测定的进展进行了综述,主要有含金试样的加工处理,金的分离富集及各种分析方法。参考文献１１０篇。     

试金富集ICP粉末法分析矿物中微量铂族元素和金

我们从地质矿物试样分析的特点出发,采用高频火花放电,将粉末试样变成粒子雾状,随戴气流引入等离子炬,开展了ICP固体粉末法的工作。本文介绍的是铂族矿物经过锍试金、锑试金富集然后以粉末形式引入等离子炬激发,定量分析硫化铜镍矿中的微量贵金属元     

化学光谱法测定超痕量的金

本法改用新型活性炭吸附柱减小灰分量,以石墨粉作活性炭灰分的分散剂,采用快速曝光,于国产一米平面光栅摄谱仪上获得测金的绝对灵敏度为1—2毫微克,为测定地质试样中低于地壳丰度量的金提供了一个精确、快速的分析方法。线性范围为2毫微克—30微克,测定o.x-xppb样品的变动系数20—27％,可用以分析含金0.1—3000ppb的试样。     

化学光谱法测定超痕量的金

本法改用新型活性炭吸附柱减小灰分量,以石墨粉作活性炭灰分的分散剂,采用快速曝光,于国产一米平面光栅摄谱仪上获得测金的绝对灵敏度为1—2毫微克,为测定地质试样中低于地壳丰度量的金提供了一个精确、快速的分析方法。线性范围为2毫微克—30微克,测定o.x-xppb样品的变动系数20—27％,可用以分析含金0.1—3000ppb的试样。     

试金富集ICP粉末法分析矿物中微量铂族元素和金

我们从地质矿物试样分析的特点出发,采用高频火花放电,将粉末试样变成粒子雾状,随载气流引入等离子炬,开展了ICP固体粉末法的工作。 本文介绍的是铂族矿物经过锍试金、锑试金富集然后以粉末形式引入等离子炬激发,定量分析硫化铜镍矿中的微量贵金属元素。一次取样同时测定Pt、Pa、Au、Os、Ir、Rh、Ru,结果较好。 实验部分 1 仪器装置及条件选择(表1) 2 分析方法     

1993年中国金分析测定的进展

综述了１９９３年中国金分析测定的进展概况，包括含金试样的加工处理，金的分离富集和各种测定方法在本年度的研究和应用情况。     

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     

PROSPECTING EXPLORATION

正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of