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自然金由于含量低(一般几—几十g/t),颗粒细微(大多在0.1mm 以下,甚至几μm或1μm 以下),往往难以分离和提纯。笔者对分离不同矿物组合中的自然金(包括银金矿,以下同)采用物理方法与化学方法相结合,取得了良好的效果,纯度一般在99%以上,不仅大大节省了挑样时间,减轻了劳动强度,也提高了单矿物的纯度。X 光、电子探针、离子探 相似文献
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本文在总结拉尔玛矿床中自然金及共生矿物一般特点的基础上,对自然金的矿物学和化学组成进行了较系统地研究。提出了决定自然金形成及在矿石、矿物中配分的主要地质因素。 相似文献
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黄铁矿中不同赋存状态金的测试及意义
—以胶莱盆地金矿中黄铁矿为例 总被引：1，自引：0，他引：1
本文论述了黄铁矿中晶格金、自然金、石英包体金的分离技术及测试方法,它可用于研究金矿载金矿物黄铁矿中不同赋存状态金与成矿的关系。运用本方法对胶莱盆地典型金矿中主成矿阶段黄铁矿三种赋存状态的金进行了测试,发现以自然金为主,且自然金含量比例差别不大,说明盆地中的金矿可能具有相同成矿流体和环境。通过对含矿与不含矿黄铁矿中离子晶格金含量研究,进行了靶区预测验证。研究发现黄铁矿中存在石英包体金,且部分金矿中石英包体金含量较高,普通测试方法可能丢失该类金,造成样品分析结果偏低,进而出现丢矿或资源量估算不准确的现象。 相似文献
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内蒙古白云鄂博矿床是著名的稀土＿铌＿铁超大型矿床 ,具有多期热液活动、矿物成分复杂的特点。前人对它进行了广泛和深入的研究。但是 ,关于金等贵金属元素及其矿物在该矿床中的地球化学行为和特征的报道很少。近期笔者通过重砂分离 ,在白云鄂博的稀土矿石中发现了自然金。自然金是在白云石型磁铁＿铌＿稀土矿石 (0 0ＢＹＣ2 8)的人工重砂中见到的 ,该矿石为萤石、独居石、氟碳铈矿和磁铁矿矿化的白云岩。第一次重砂分离是在国土资源部天津地质矿产研究所进行的 ,样品的重量约为 2 0ｋｇ ,用于此矿石样品破碎的所有设备都经过彻底的风淋清… 相似文献
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湘西沃溪钨锑金矿床超纯自然金 总被引：2，自引：0，他引：2
湘西沃溪钨锑金矿床产有自然界中十分罕见的超纯自然金。超纯自然金的Au含量在99 %以上 ,Fisher成色接近1000。自然金中含有Ag、Pb、Zn、Cu、As、Sb、Hg、Bi等显微化学组分。与一般自然金相比 ,超纯自然金的Ag 含量显著偏低 ,而Pb、Zn、As、Sb、Hg、Bi等显微化学组分含量趋于偏高 ,且较稳定。理论分析表明 ,超纯自然金的形成与强氧化性的酸性成矿流体有关。流体中金、银主要以MeCl2-(Me=Au或Ag)的络合物形式迁移。推断矿床成矿可能与区域中酸性岩浆活动有成因联系。 相似文献
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金在硫化物矿物中呈负价态存在及其形成机理初探 总被引：13，自引：1，他引：12
通过对中国广西卡林型金矿的含金毒沙、黄铁矿及用热液实验方法合成的含黄铁矿、白铁矿的分析和研究,特别是光电子能谱分析,发现其中存在电子结合能低于自然金（Ａｕ＾０）的“不可见金”。因而提出金在上述硫化物矿物中由于取代部分硫并与硫呈共价键结合而负价态点。本文料从金的化学及地球化学性质,毒砂,黄铁矿及白铁矿的晶体化学特征和产出的地球化学环境等三方面初步探讨了其形成的可能性。 相似文献
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利用黄铁矿进行找金是一种新的地球化学找矿方法。其特点是黄铁矿在矿化作用的早期对金及其伞生元素的富集，使金矿外围散染状黄铁矿中出现的金的异常；在金的成矿时期，由于自然金的形成，黄铁矿中金的含量下降。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
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. 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
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. 相似文献
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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
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. 相似文献
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Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
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. 相似文献
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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.) 相似文献
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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.) 相似文献
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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.) 相似文献
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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., 相似文献
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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 相似文献