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1.
大团山铜（钼） 矿床是安徽铜陵狮子山矿田内较为典型的岩浆热液叠加型铜钼矿床,其成因与早白垩世大团山石英
二长闪长岩有密切关系。系统采集硫化物阶段的矿化石英脉并经岩相学显微观察发现,石英中捕获有大量的流体包裹体,
主要分为三种类型,即富气相（Ⅰ型）、富液相（Ⅱ型） 的两相水溶液包裹体和含子晶的三相水溶液包裹体（Ⅲ型）。显微
测温研究表明,流体包裹体的均一温度统计峰值分别出现在375~405°C和285~315°C之间,流体盐度的统计峰值出现在5.0
wt.%~10.0 wt.% NaCl eq.之间。激光拉曼探针分析表明,流体包裹体的气相成分以水蒸汽为主,含有少量CO2和CH4。流体
氢、氧同位素组成呈岩浆流体特征。研究表明,大团山铜（钼） 矿床的成矿流体主要来源于岩浆流体,在成矿过程中经历
了相态变化,沸腾的流体体系受到了不均匀捕获。结合前人研究成果,狮子山矿田内早白垩世叠加改造型流体表现出同源
特征,在物理化学演化方面具有一定规律性,流体的多次沸腾作用很可能对成矿元素的分配、迁移与沉淀起到了重要作用。 相似文献
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3.
木吉村铜（钼）矿床地质特征 总被引：6，自引：1，他引：5
河北省涞源县木吉村铜（钼）矿床目前已探明为一大型斑岩型铜（钼）_矽卡岩型铁铜-热液脉型铅锌银“三位一体”多金属矿床。作者结合最新勘查成果,对该矿床的成矿地质背景、矿床地质特征进行了总结,探讨了该矿床的成因和成矿模式。研究表明,木吉村铜（钼）矿床位于山西断窿与燕山台褶带的过渡地带,乌龙沟_上黄旗深断裂带中。该矿床的主要控矿构造为F4断裂,成矿母岩闪长玢岩与古火山构造关系密切。该矿床具有典型的面型蚀变分带及矿化分带。其矿床成因主要为斑岩-矽卡岩型高（中）温热液矿床,以“多位一体”和多阶段成矿为特点。 相似文献
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随着战略性新兴产业的快速发展,稀有金属等关键金属资源的地位日益不可或缺。花岗伟晶岩是最重要的稀有金属矿床成因类型,该类型矿床的成矿流体特征和成因机制是矿床学的热门研究话题。文章主要对花岗伟晶岩型矿床的成矿流体特征和成矿机制进行了探讨。花岗伟晶岩型稀有金属矿床成矿流体普遍富集挥发分（B、P、F和H2O）和成矿元素,具有低黏度、低成核率、强元素溶解能力和强迁移性。花岗伟晶岩型稀有金属矿床成矿流体形成温压条件存在争议,部分研究者认为形成于高温高压条件,也有研究者认为可能形成于过冷却条件下,温度可能低至350℃。花岗质岩浆高度结晶分异演化和富成矿元素地壳物质小比例深熔是形成成矿花岗伟晶岩的两种主要机制。流体不混溶和组成带纯化是岩浆热液演化过程中稀有金属进一步富集的重要手段。中国规模最大的甲基卡花岗伟晶岩型锂矿是研究该类矿床的理想实验室。 相似文献
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八大关铜钼矿床为内蒙古额尔古纳地区发现较早但研究程度较低的典型斑岩型矿床。为确定其成矿机制、形成时代和构造背景,对主成矿阶段矿石脉石英中的流体包裹体开展了岩相学、显微测温、气相组分的激光拉曼光谱分析,利用LA-ICP-MS锆石U-Pb法和辉钼矿Re-Os法分别测定了成矿石英闪长斑岩体和铜钼矿石的同位素年龄。结果表明：八大关铜钼矿床成矿流体为中高温、中低盐度、中低密度的NaCl-H2O-CO2±CH4流体体系,流体的沸腾作用是矿床形成的重要机制;成矿石英闪长斑岩体的锆石U-Pb同位素年龄的加权平均值为（217.6±2.6）Ma,矿石中辉钼矿的Re-Os模式年龄为（222.4±3.3）Ma,因此八大关矿床的成岩成矿作用发生于晚三叠世。综合本文获得的成岩成矿年龄及前人在区域构造演化方面的研究资料认为,八大关矿床形成于与洋壳俯冲有关的活动大陆边缘构造背景,与蒙古-鄂霍茨克洋向南俯冲所引起的构造-岩浆活动具有密切的成因联系。 相似文献
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《吉林大学学报(地球科学版)》2015,(Z1)
<正>大桥金矿床位于甘肃省陇南市西和县城南,是近年来在西秦岭东段发现的一种新类型的金矿床[1]。笔者在成矿地质背景及岩相学研究的基础上,通过对该矿床脉石矿物中包裹体的特征进行研究,结合矿床地质特征,探讨其成矿流体来源,成矿条件和矿床成因。这不仅可以从理论上加深对该矿床的认识,丰富西秦岭地区的金矿成矿理论,而且可为在矿区外围寻找同类型金矿床提供科学依据。大桥金矿是最近几年甘肃省地质调查队通过化探异常发现的,相关研究较少,对于流体包裹体研究的未见报导。 相似文献
7.
通过对建德铜矿床调查研究,总结矿床成矿条件,分析控矿因素,探索矿体分布规律,确定岩浆热液成因后,提出矿液运移理论,首次运用计算机进行数学物理模拟和深部成矿预测,已均被证实,表明所采用理论、方法的合理性和正确性。因矿区发现少量火山岩和硅质岩等而提出海底火山热液沉积成因,经近年矿区地质特征、成矿年龄和流体包裹体等详细研究和开采勘查,认为该矿床为岩浆热液成因,并据此在该矿床外围找到类似的高岭铜矿床。随着矿床研究的深入,在矿床地质特征、成矿时代、成矿流体和成矿物质来源等取得了新进展,矿床成因和成矿机制也因此得到进一步验证。 相似文献
8.
超大型铜镍硫化物矿床研究进展 总被引：4，自引：0，他引：4
超大型铜镍硫化物矿床不仅赋存有巨大的铂族贵金属资源,而且赋存有非常重要的深源信息,对其成矿理论的多学科综合研究具有重要的理论和实际意义。通过对超大型铜镍硫化物矿床的产出特征、时空分布、构造环境、控矿条件、母岩浆系列、成矿机理等研究现状的总结,认为以下几方面研究具有较大潜力：（１）矿床成因;（２）通过构造—流体—岩浆—成矿动力学综合研究,揭示成矿机制与全球变化的内在关系;（３）元古宙板块构造演化与超大型矿床形成的关系。 相似文献
9.
热液矿床的成矿流体与成矿机制——以中国若干典型矿床为例 总被引：2，自引：0，他引：2
流体包裹体研究是获得成矿流体性质如温度、压力和成分信息的主要手段,对于矿床成因类型和成矿机制的研究至关重要。目前,流体包裹体研究手段已经广泛应用于各类热液矿床的流体研究中,并且积累了大量研究数据。本文选择斑岩型矿床、矽卡岩型矿床、浅成低温热液矿床、海底热液及块状硫化物矿床(VMS型)和造山型金矿5种典型热液矿床,通过总结其中流体包裹体的岩相学特征、温度、盐度及同位素数据,并结合围岩蚀变和矿化分带特征,对不同类型矿床中成矿流体的性质、来源及成矿机制进行了探讨。 相似文献
10.
黔西北地区铅锌矿床流体包裹体与硫同位素地球化学研究 总被引：4，自引：2，他引：2
黔西北铅锌成矿区位于扬子地块西南缘,矿床产于不同时代的碳酸盐岩建造中,其矿物组合和热液蚀变特征类似于MVT型铅锌矿床。本文通过对该区部分铅锌矿床的矿石显微岩相学结构、矿物学与地球化学、脉石矿物和闪锌矿中流体包裹体岩相学与显微测温学以及硫同位素地球化学等研究,确定了该类型矿床成矿流体的性质及其成矿过程。结果表明,黔西北地区不同赋矿层位铅锌矿床具有相似的成矿流体特征,为中低温(160~260℃)、较高盐度(10%~22%NaCleqv)、含有低密度的CO_2、CH_4和N_2的卤水,不同于MVT型铅锌矿床成矿流体特征;硫同位素地球化学研究揭示,这些铅锌矿床硫化物的δ~(34)S范围均落在对应赋矿地层时代蒸发岩中的硫酸盐和生物成因硫化物的δ~(34)S演化曲线上或其附近,表明这些铅锌矿床硫化物中的S可能主要来源于对应地层本身。结合地球化学热力学分析,认为Pb、Zn等成矿元素的Cl络合物是成矿元素的主要搬运形式,富含Pb、Zn的成矿流体与赋矿地层中富含H_2S还原性流体的混合是铅锌富集成矿的重要机制之一。 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
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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
16.
正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
17.
正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
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正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
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正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
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正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献