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1.
陈紫新 《矿物岩石地球化学通报》1998,(1)
低温条件下锡的实验地球化学研究＠陈紫新￥中国科学院地球化学研究所锡的可溶性,络合作用,实验地球化学,低温体系低温条件下锡的实验地球化学研究陈紫新（中国科学院地球化学研究所,贵阳５５０００２）关键词锡的可溶性络合作用实验地球化学低温体系目前,国内外对锡的成矿... 相似文献
2.
有机质在层控铅锌矿床中作用的实验研究 总被引：5，自引：0，他引：5
有机质在层控铅锌矿床中的作用已受到普遍重视。本文的实验研究内容和主要研究成果包括如下三个方面:1.Cu2+，Pb2+，Zn2+在共存的水相和油相中分配系数与温度和溶液成分关系的实验研究，证明在酸性条件下Cu，Pb，Zn元素95%以上趋向于在水溶液中，而在弱碱性条件下这些元素有强烈的在油相中富集的趋向，表现出典型的卟啉化合物的特征；2.矿物在油田卤水和相同盐度的Cacl－Nacl溶液中溶解度的对比实验研究，讨论了金属元素在油田卤水中的无机络合作用和有机络合作用之间的竞争能力；3.在人工组合双源层和温度压力同时作用的压力机条件下，进行了油气生成和运移过程对Pb，Zn元素活化迁移的实验研究，实验证明，新生成原油（氯仿沥青Ａ）中获得了Zn的52-769μg/g的高丰度，其中经过初次运移的原油往往含有更高含量的金属元素。因此，有理由认为在一定的成熟度范围内原油相可能是Pb，Zn等多金属元素迁移富集的重要载体和成矿流体的重要组成部分。 相似文献
3.
通过广西某金矿床中金测定,综合东北和华北13处金矿床中金的测试数据,认识到金元素的迁移形式,多数与二氧化硅熔体共同迁移。通过模拟实验,初步认为金的成矿过程,可能呈原子状态迁移。当然,此项工作还有待进行系统而全面的实验研究。 相似文献
4.
关于热液铀矿床中铀的迁移形式,存在着各种不同的观点,(1)以六价铀酰络合物迁移为主,但不排除少量四价铀的络合物迁移;(2)以四价铀及六价铀的络合物混合迁移;(3)以四价铀的络合物迁移为主;(4)参与铀迁移的介质为含HCO_3~-、F~-、Cr~-、SO_4~(2-)等离子的水溶液及二氧化硅水溶胶等。其中一些看法有待理论和实验的进一步验 相似文献
5.
利用热力学方法计算了西秦岭铀矿床含矿热液中铀的迁移形式。结果表明，从含矿热液早阶段到主成矿作用发生之前，热液中的铀主要以「ＵＯ２（ＣＯ３）＾０」形式迁移；在晚阶段残余热液中，铀的迁移形式改变为「ＵＯ２（ＳＯ４）＾０」为主。铀迁移形式改变的原因与大气降水中ＳＯ＾２－４离子的大量带入有关，表明含矿热液来自深部而非大气降水。 相似文献
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烂泥沟金矿的成矿物质主要来源于围岩地层，围岩地层经受了强烈的断裂变形作用，而金矿体的分布则严格受控于断裂构造。构造地球化学实验模拟了构造对金成矿的控制作用，结果表明构造作用中金，铁等成矿物质发生了明显的迁移，而铁的迁移距离大于金的迁移距离；其迁移的通道可能（主要）为粒间流体，其次为动力作用中产生的裂隙；迁移的方式可能（主要）以Ａｕ－Ｓｉ－Ｆｅ的络合物形式，其次有机械的形式；构造作用同时也提供了成矿物质聚集的空间，且动力作用强度越大，产生的裂隙越多，聚集的规模也越大。 相似文献
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8.
云南老王寨金矿田金的迁移形式和富集机理探讨 总被引：3，自引：0，他引：3
通过测定成矿过程不同阶段形成的包裹体温度、压力及成分，在了解成矿热液的成矿过程中温度、压力及其组分变化的基础上，将实验地球化学与热力学方法相结合，研究了金矿田成矿热液在成矿过程中的物理化学条件、迁移形式及金沉淀富集的地球化学机理。研究结果表明，金在热液中主要以AuCl4^-、AuS^-、Au（HS）2^-、AuAsS3^2-、AuSbS3^2-的形式迁移，并在物理化学条件t、p、pH、fα2、fs2降低的情况下富集。 相似文献
9.
与花岗岩有关锡矿成岩成矿作用研究若干问题讨论 总被引：5，自引：1，他引：4
文章基于近年来大量典型锡矿床和成矿区带成岩成矿作用及高温高压实验研究成果,对锡矿成矿年代学、成矿花岗岩类型、物质来源、源区物质的熔融条件及锡在岩浆中的存在形式、熔体-流体相间分配行为及热液流体中的存在形式等方面的研究进展及存在问题进行了系统综述,指出:①锡石原位U-Pb测年已成为直接测定锡成矿年龄的有效手段,近年来发展起来的多种矿石矿物U-Pb测年方法与传统蚀变矿物测年方法的结合,将为研究锡多金属矿床多期次成矿作用叠加、矿集区内不同类型矿床成因联系及区域矿床组合模型的建立提供关键的年代学依据;②锡的富集成矿不仅与花岗质岩浆的高程度的结晶分异密切相关,而且受源区组成及部分熔融条件的制约;③全球锡多金属矿床的不均匀分布、与准铝质花岗岩有关锡矿的富集成矿机制以及各类复杂的锡-钨-铜-钼-铅-锌银多金属矿种组合差异及其金属元素富集机制亟待查明;④已有的关于锡在花岗质熔体、热液流体相中的存在形式及两相间的分配行为的高温高压实验结果受锡与贵金属容器间合金效应的影响,人工合成流体包裹体等新的实验方法的开发及XAS同步辐射和激光拉曼等原位分析技术的应用,将为研究花岗岩浆-热液过程锡的迁移、富集及沉淀成矿机制提供更为直接、可靠的实验依据。 相似文献
10.
锡氢化物是锡的重要迁移形式 总被引：6，自引：1，他引：6
论述了锡氢物的形成条件和物理学特征。在岩浆和热液中，锡以锡氢化物，锡合金氢化物迁移至地壳浅部，锡氢化物，锡合金氢化物被氧化成锡氧化物，锡合金矿物，或与硫，硫化氢作用形成锡的硫化矿物。 相似文献
11.
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
12.
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
13.
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
14.
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
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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 相似文献