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1.
猫岭金矿床位于辽宁省盖县境内,地处华北地台东南缘。矿床的成矿物质来源于辽河群。成矿热液为吕梁期变质热液。金矿化带的展布受基底褶皱构造和剪切带构造控制,矿化类型以含硫化物石英脉型和硫化物细脉浸染型为主,矿石最大特点是含金硫化物石英脉同围岩糜棱岩化千枚岩同时卷入褶曲变形,金主要以裂隙金产于毒砂和磁黄铁矿中。对猫岭金矿床成因的认识,过去许多学者认为,辽南地区的金矿成因均与中生代构造岩浆活动密切相关,而猫岭金矿的发现,提出了一种新的观点——辽南地区早元古代可作为一个重要成矿期,揭示了辽南一种新的金矿类型——变质热液含金剪切带型。  相似文献   

2.
辽宁猫岭大型金矿床成岩成矿年龄及同位素地球化学特征   总被引:1,自引:0,他引:1  
刘军  李铁刚  段超 《地质通报》2018,37(7):1325-1337
猫岭矿床是华北克拉通北缘重要的含砷浸染型金矿之一,赋存于元古代辽河群变质岩中。矿体以脉状、似层状、透镜状等产出,受NE向和NW向韧性剪切带及次级断裂控制。选取猫岭矿床10件硫化物样品开展了Rb-Sr定年,获得Rb-Sr等时线年龄为2287±95Ma(MSWD=1.9),初始Sr同位素比值I_(Sr)=0.7117,显示成矿作用发生于古元古代早期。矿区内卧龙泉和猫岭岩体的LA-ICP-MS锆石U-Pb年龄分别为183.0±1.8Ma、128.8±1.6Ma,表明晚中生代岩浆活动与猫岭金矿化无成因联系。成矿流体的δ~(18)O_W值为6.3‰~9.7‰,δD_W值为-97.2‰~-82.6‰,表明成矿流体主要来源于岩浆热液,混合部分大气降水。金属硫化物的δ~(34)S值为+4.3‰~+10.5‰,平均值为+7.9‰,与辽河群盖县组的硫同位素组成相似,表明硫源区为古元古代盖县组。猫岭矿床形成于古元古代伸展构造背景,与辽河群早期的同构造岩浆-热液活动有关,同期形成的强硅化圈保护金矿体免受后期地质作用的破坏。  相似文献   

3.
南江坪金矿主要矿体产于五强溪组上段浅变质碎屑岩系岩层劈理化带,严格受陶金坪—龙鼻桥复背斜控制,成带状平行展布。矿区主要控矿和容矿构造为NE向剪切破碎蚀变带,其上下盘剪切滑动面清晰,剪切破碎蚀变带内NE向硅化网脉带与蚀变板岩互层产出;NE向硅化网脉带张性充填的低序次NE向石英细脉和NW、NNE、NNW、近SN向的石英细脉穿插形成共轭、棱型张性硅化网脉带,张性硅化网脉带内的石英细脉及硅化蚀变岩中发育毒砂化、黄铁矿化等,是金的主要含矿富集部位。褪色化、硅化、毒砂化、黄铁矿化等与成矿关系密切,毒砂是矿区主要载金矿物。  相似文献   

4.
小秦岭金(钼)矿省发育大量脉状金(钼)矿床,具有重要经济价值。本次研究选择大湖、灵湖和金渠金(钼)矿床,通过系统的构造-蚀变-矿化研究和金相关黄铁矿原位硫同位素分析,拟查明小秦岭金和钼矿化基础地质异同和硫同位素组成及其控制因素。构造-蚀变-矿化研究表明上述金(钼)矿脉赋矿围岩均为前寒武太华群变质岩,控矿构造主要为近EW向(局部为NW向)剪切带,金和钼矿体发育在同一剪切带不同部位或局部叠加。钼矿脉通常发育钾化和硅化蚀变和辉钼矿和黄铁矿等矿石矿物组合,而金矿脉以绢英岩化蚀变为主,主要发育黄铁矿、多金属硫化物和碲化物等矿石矿物。原位S同位素结果显示大湖矿床钼矿脉中黄铁矿δ34S值为-3.3‰~+3.3‰,而大湖、灵湖和金渠金矿脉中黄铁矿δ34S值为-7.8‰~+8.9‰。大湖和灵湖近EW金矿脉中黄铁矿δ34S值分别为-2.8‰~+0.4‰和-7.8‰~+8.2‰,与大湖金矿脉相比,灵湖金矿脉倾向较缓且发育大量围岩角砾表明上述硫同位素组成可能由差异水力破裂和水岩反应控制。金渠金矿脉近EW和NW向矿脉中黄铁矿δ34  相似文献   

5.
辽宁盖县猫岭金矿床毒砂的矿物学研究及成因意义   总被引:1,自引:0,他引:1  
盖县猫岭金矿床以毒砂和磁黄铁矿为主.毒砂可划分为大颗粒毒砂、细脉状及毒砂石英脉中的毒砂和细粒浸染状毒砂三种性状.毒砂与金矿化密切相关.化学分析结果表明,矿区毒砂为“硫”毒砂,形成于中低温条件、中深部位.毒砂中δ~(34)S值同辽河群的δ~(34)S相一致,表明毒砂中的硫来源于辽河群.毒砂矿物标型特征指示矿床成因  相似文献   

6.
金英金矿成矿阶段化分初探   总被引:1,自引:0,他引:1  
简单地介绍了金英金矿围岩、含矿岩层和矿区构造特征,矿石结构构造、矿物共生组合、矿物生成顺序、矿脉间的穿切包容关系,将矿床形成划分为4个矿化阶段,即早期硅化石英-金-烟灰色黄铁矿阶段;微细粒硅化石英-金-星散浸染状黄铁矿阶段;重晶石、玉髓-金-赤铁矿阶段和微含金细粒黄铁矿—白铁矿迭加矿化阶段。详细地论述了个成矿阶段每一成矿阶段具体特征。  相似文献   

7.
哈图金矿蚀变岩型矿体特征及金赋存状态研究   总被引:1,自引:0,他引:1  
哈图金矿由石英脉型和蚀变岩型矿体组成,蚀变岩型矿体遭受了强烈黄铁矿化、毒砂化、碳酸盐化、硅化和绢云母化蚀变.成矿作用划分5个阶段:钠长石-石英阶段(I)、黄铁矿-碳酸盐-石英阶段(II)、黝铜矿-黄铜矿-自然金阶段(III)、毒砂-碳酸盐-绢云母阶段(IV)和方解石-石英阶段(V).其中,II—IV阶段是主要金成矿阶段.哈图金矿含金矿物主要为自然金,平均成色912.自然金呈裂隙金、包裹金、粒间金形式嵌布在黄铁矿和毒砂中.当载金矿物为黄铁矿时,自然金与黝铜矿-黄铜矿-闪锌矿关系密切;当载金矿物为毒砂时,自然金与黄铁矿-黄铜矿关系密切.  相似文献   

8.
辽东地区金矿床类型、成矿特征及找矿潜力   总被引:3,自引:1,他引:2  
辽东地区是我国重要的金矿集区之一,中生代构造、岩浆活动强烈,并伴生强烈的金成矿作用。根据金矿床时空分布及成矿特征,将辽东地区划分为三个金矿集区:青城子、五龙、猫岭。矿集区内金矿包括石英脉型金矿和蚀变岩型金矿这两种类型,并分别受高角度断裂和低角度断裂构造体系控制。辽东地区金矿成矿时代主要为早白垩世,少量早侏罗世。已有H-O同位素、成矿流体及地质研究表明:(1)区内金成矿与中生代岩浆活动有关、受断裂构造控制,并以强烈硅化-绢云母化为特征标志;(2)区内金矿床属于岩浆热液型矿床;(3)充填作用和混合作用可能是辽东地区金矿床成矿物质沉淀的机制。辽东地区金矿成矿系统按其产出环境及特点,可分为两个亚系统:产于中生代花岗质岩体内岩浆热液金成矿系统(五龙式)及产于古元古代变质岩中岩浆热液金成矿系统(青城子式、猫岭式)。结合区域找矿进展和近期研究工作,建立了辽东地区金矿找矿预测地质模型,认为本区具有与胶东地区相似的金矿成矿条件,成矿潜力巨大,研究工作对区域矿产勘查部署工作有指导意义。  相似文献   

9.
孙卫志  王振强 《地质论评》2012,58(4):671-680
本文针对小秦岭金矿田大湖钼金矿矿床地质、地球化学特征进行了系统的分析。矿区浅部为石英脉型金矿体,向深部延伸出现石英脉型钼矿体,F5断层是大湖矿区内金、钼矿主要的含矿构造,钼矿体与金矿体共生或独立存在。钼矿体顶板围岩主要发育钾长石化,而金矿体顶底板围岩则发育硅化、绢云母化、黄铁矿化,其中绢云母化和中细粒黄铁矿化与金矿体关系最为密切。含金石英脉流体包裹体气相组分以CO2、H2O为主,含有少量CH4、C2H2等还原性气体,液相组分主要为Na+、Ca2+、Cl-、F-等离子。钼矿体与金矿体的H、O同位素数据显示钼矿脉与金矿脉的成矿流体主要都是来自岩浆水,但是两种矿体的H、O同位素组成又表现出一定的差异。辉钼矿化石英脉与金矿体中钾长石化和黄铁矿化石英脉中的稀土组成具有明显的不同,辉钼矿化石英脉具有较高的的∑REE和轻重稀土分馏,指示金矿体与钼矿体成矿流体来源不同,金、钼可能形成于不同的成矿期。  相似文献   

10.
河南嵩县东湾金矿受构造蚀变带控制,矿体形态呈脉状或透镜状.矿石呈浸染状、细脉-浸染状、脉状-网脉状和蜂窝状等.围岩主要蚀变类型包括硅化、绢云母化、高岭石化、碳酸盐化、钾长石化、黄铁矿化.成矿阶段可分为4段:(1)硅化(黄铁矿)阶段;(2)石英-粗粒黄铁矿阶段;(3)石英-细粒黄铁矿阶段;(4)碳酸盐铅锌阶段.各阶段自然金矿物生成顺序是:自然金→银金矿→自然银→硫盐矿物.文中利用构造叠加晕原理,建立了河南嵩县东湾金矿构造叠加晕模式,并利用该模式对东湾金矿进行了成矿预测.  相似文献   

11.
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.
Robert L. Linnen   《Lithos》2005,80(1-4):267-280
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   

13.
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   

14.
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   

15.
正The Kuqa depression deposited thick rock salt,which has a lower density than surrounding rocks.When salt bodies form a certain scale,obvious negative gravity anomalies can be detected in the surface.Therefore,gravitational method can quickly obtain the shape,plane distribution of deep-seated salt bodies and overall tectonic morphology of the basin.  相似文献   

16.
正1 Introduction The Pingluoba brine,which characterized as high concentration with sodium,potassium,boron,lithium,and rubidium,possess great development value.The main composition of the brine can be summarized to the  相似文献   

17.
正1 Introduction In the present paper,MgCl2·6H2O,FeCl3·6H2O,and CeCl3·6H2O were used as raw materials in the precipitationhydrothermal method to synthesize MgF eC e hydrotalcite.The effects of the Fe:Ce molar ratio on the composition,crystal structure,and thermal stability of hydrotalcite are examined.Energy-dispersive X-ray spectroscopy(EDS),X-  相似文献   

18.
正1 Introduction Crystallization is one of important unit operations in the chemical production process,which requires not only the crystal product with high purity and yield,but also the available particle size of the crystal products to ensure product quality.Crystallization process is affected by  相似文献   

19.
正Dear Authors and Readers:First of all,on behalf of the new Editorial Board,I would like to express our sincere appreciation for your continuing support of our journal.This journal,founded in 1922,is the oldest geological journal in China.As the flagship journal of the Geological Society of China,it has become more and more influential in earth sciences in China and beyond.The journal is now indexed by SCI,CA and more than 20 other databases,with an impact  相似文献   

20.
正20141283 Bai Daoyuan(Hunan Institute of Geological Survey,Changsha 410016,China);Zhong Xiang Nature,Origin and Tectonic Setting of Jinzhou Basin in the South Segment of Xuefeng Orogen(Geology in China,ISSN1000-3657,CN11-1167/P,40(4),2013,p.1079-1091,10 illus.,47 refs.)Key words:foreland basins,strike-slip faults,Hunan Province  相似文献   

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