紫金山铜金矿床铜蓝垂向变化特征探讨

<正>1研究背景及意义福建省上杭县的紫金山铜金矿床是我国大陆发现的首例高硫化型浅成低温热液矿床,具有"上金下铜"的垂直矿化分带特征,铜矿体主要分布在+928~-400 m,铜金属量丰富,大于300万t。该矿床目前已发现Cu-S体系8种矿物[1],硫砷铜矿、块硫砷铜矿、斑铜矿、黄铜矿等21种铜矿物。铜矿物中蓝辉铜矿、铜蓝、块硫砷铜矿、硫砷铜矿占99%以上。前人对铜蓝-蓝辉铜矿的矿物成分和矿物组合分布特征有较深     

紫金山金铜矿床深部成矿作用研究和找矿前景评价的关键

紫金山铜金矿床是典型的高硫化浅成低温热液矿床, 发育巨厚的热液蚀变帽, 多孔状石英和高级泥化蚀变带等标志性特征; 特别是在金矿体之下出现垂直厚度超过1000米的巨大铜矿体, 属于蓝辉铜矿－铜蓝－硫砷铜矿－明矾石矿物组合的高硫化型浅成低温热液铜矿床类型, 铜硫化物的矿物学研究预示着深部可能变为斑岩型铜矿床。     

紫金矿铜蓝-蓝辉铜矿的矿物成分研究

<正>紫金山金铜矿属少见的高硫型浅层低温热液矿床,其铜矿的主要矿石矿物由铜蓝-蓝辉铜矿-硫砷铜矿组成。根据其形成深度和矿石结构构造类型,前人认为它们的成因属于中低温热液成矿(陈景河,1992;薛纪越等,2000)。Cu-S二元     

福建紫金山矿床硫砷铜矿的成因研究

福建紫金山铜矿是我国高硫化型浅成低温热液矿床研究的热点之一。本文针对该矿床中普遍发育的硫砷铜矿进行了仔细的矿相观察及电子探针化学成分分析,对其成因进行了初步研究。该矿床中硫化物矿物之间存在着一定的交代、穿插以及化学组分的继承关系。矿物生长遵循黄铁矿-硫砷铜矿-斜方蓝辉铜矿、蓝辉铜矿-铜蓝的交代生长顺序。结合室内水热反应模拟实验结果,推测矿床经历了2期、4阶段热液事件:第1期第1阶段形成黄铁矿;第2阶段形成硫砷铜矿;第2期第1阶段形成各种铜硫化物,铜蓝在第2期第2阶段形成。其中硫砷铜矿中的砷元素来自于岩浆热液,其显示出交代先成黄铁矿的特征,也有少量结晶于矿石的较大裂缝处形成自形柱状晶体。表生带中的硫化物矿物曝露在地表或潜水中遭受风化剥蚀,逐渐形成高硫型浅成热液,并沿构造裂隙持续下渗至岩体附近受热折返,在下渗和折返的过程中交代先成的黄铁矿和硫砷铜矿,生成斜方蓝辉铜矿和蓝辉铜矿等铜硫化物,该交代反应符合"耦合的溶解再沉淀"的成因机制。热液下渗和受热折返是1个循环往复的过程。     

福建紫金山矿田金、银赋存状态及黄铁矿标型研究

福建紫金山铜金矿床、悦洋银多金属矿床和罗卜岭斑岩型矿床同属于与陆相火山岩相关的斑岩-浅成低温热液成矿系统。通过显微镜观察、电子探针成分分析、场发射扫描电子显微镜观测和矿石元素含量分析等综合研究方法,认为紫金山铜金矿床金的赋存状态除金矿石中自然金矿物外,金还赋存于铜矿石中硫砷铜矿、蓝辉铜矿、久辉铜矿和黄铁矿中,硫砷铜矿含金性最好,金含量最高达370 μg/g;悦洋银多金属矿床银的赋存状态包括独立银矿物、亚显微银矿物和类质同象银,银的载体矿物有方铅矿、黄铁矿、黄铜矿等;黄铁矿是紫金山铜金矿床和悦洋银多金属矿床中共同存在的矿物,黄铁矿成分标型特征表明两处矿床的形成均与热液有关,与前人的研究结果一致。     

福建紫金山铜金矿床铜矿物及其主要特征

<正>位于福建省上杭县的紫金山铜金矿床是我国大陆发现的首例高硫化型浅成低温热液矿床,具有"上金下铜"的垂直矿化分带特征。金矿体之下为垂直厚度超过1000米的巨大铜矿体,铜矿石以蓝辉铜矿-铜蓝-硫砷铜矿-明矾石矿物组合为主,铜矿物种类多样化。1铜矿物的种类在紫金山铜金矿区内铜矿物种类丰富,目前     

紫金山金铜矿二元铜硫化物成分特点的初步研究

文章在电子显微成分分析的基础上,结合XRD、振动光谱等研究手段,对高硫型浅成热液形成的紫金山金铜矿床中铜硫化物的成分、物相特点进行了研究.首次在该区找到了久辉铜矿(Cu1.97S)、雅硫铜矿(Cu1.25S)等铜硫二元组分系列矿物,并发现了铜蓝被蓝辉铜矿明显交代的现象,进而推断它们基本上是同期形成的,但其所处的氧化-还...     

四川沐川含铜砂岩型钼铼(锇)矿床中的硒铅矿

四川沭川地区含铜砂岩型钼铼(锇)矿床中发现了铅的硒化物。该矿物呈它形粒状,主要见于胶硫钼矿、蓝辉铜矿中,其共生矿物为黝铜矿和辉铜矿。Pb、Se的X射线分布像和化学成分分析表明该矿物为硒铅矿。     

福建省紫金山铜金矿床成矿物理化学条件的研究

紫金山高硫浅成低温热液型铜金矿床以一套独具特色的由地开石、明矾石组成的高级泥质蚀变和由硫砷铜矿、蓝辉铜矿、铜蓝组成的铜矿物组合为特征。本文根据矿床的蚀变矿物和矿石矿物组合及矿物的相互关系，着重应用热力学的原理与方法研究矿床形成的物理化学条件。认为形成这一类型矿床的流体是一种高氧逸度、高硫逸度的中低温酸性流体。     

基于XRF的紫金山铜矿床硫地质特征

福建紫金山铜矿床属高硫浅成中低温热液矿床,矿石中主要含铜矿物为蓝辉铜矿、铜蓝和硫砷铜矿等,且铜矿物与黄铁矿密切共生。由于铜矿石中硫含量较高,导致铜精矿中硫含量超标,w(S)/w(Cu)比值为2.0~2.1,远高于冶炼要求的1.15~1.20,影响其经济价值。使用X射线荧光(XRF)光谱分析对紫金山铜矿中S元素的分布进行数字化研究,查明硫的空间分布规律和赋存状态,划分铜矿石类型,为紫金山铜矿今后的采选工作提供参考。     

西藏多龙矿集区发现浅成低温热液型铜(金银)矿床

根据2013年最新勘查成果、详细的地质编录,对西藏多龙铜金矿集区铁格龙南(荣那)铜(金银)矿床地质特征、矿床类型进行了初步研究,认为该矿床是斑岩-浅成低温热液成矿系统的产物,是典型的高硫型浅成低温热液矿床。矿床规模巨大,矿石中发育条带状、层纹状、皮壳状、致密块状明矾石、地开石,深部发育黄铁绢英岩化,黄铁矿的含量为3%~35%,矿石矿物由铜蓝、蓝辉铜矿、硫砷铜矿、斯硫铜矿、雅硫铜矿、久辉铜矿、斜方蓝辉铜矿、斑铜矿、黝铜矿、黄铜矿等组成。综合研究表明,推断浅部或外围发育独立的高硫型浅成低温热液型金矿,深部存在斑岩型铜(金银)矿体。该矿体的发现结束了西藏至今没有发现典型浅成低温热液矿床的历史,对区域找矿具有极其重要的指导意义。     

Diagenetic alterations of copper sulfides in modern ore-bearing sediments of the Logatchev-1 hydrothermal field (Mid-Atlantic Ridge 14°45′ N)

Sulfide ore samples recovered by corers from and beyond Orebody 1 in the Logatchev-1 hydrothermal field (Mid-Atlantic Ridge, 14°45′ N) are studied by optical, electron microscopic, X-ray microspectral, and X-ray diffraction methods. The major and ore minerals are identified. Sulfides of the Cu-S system, the major ore-forming minerals in sediments, are investigated in detail. Specific features of their composition, structure, secondary alterations, and distribution in sediments of the Logatchev-1 field are considered. It has been established that sulfide concretions in modern sediments primarily consist of nonstoichiometric minerals of the chalcocite-digenite series, i.e., djurleite (Cu_1.96S) and roxbyite (Cu_1.75–1.86S). It is assumed that copper sulfides primarily precipitated from hydrothermal solutions as high-temperature hexagonal chalcocite that was replaced after the hydrothermal activity by djurleite, roxbyite, and other nonstoichiometric minerals of the Cu-S system. Based on the comparison of their paragenetic associations with those of copper sulfides in hydrothermal chimneys, the paper discusses constraints of the diagenetic transformation of sulfides in ore-bearing sediments and the halmyrolysis of modern hydrothermal edifices located in contact with seawater. Roxbyite recently discovered in oceanic sediments plays a specific role in these processes.     

江西东乡铜矿中含铜硫化物的几种 微结构及其地质意义

根据对江西东乡铜矿矿石矿物的光学显微镜以及电子探针的研究,发现了该矿石中久辉铜矿与蓝辉铜矿呈页片状或互界状的交生构造,同时还存在着斑铜矿-蓝 辉铜矿的环带状构造。这两种构造中的蓝辉铜矿在成分上有明显差异,前一种构造中的蓝辉 铜矿不含Fe,而环带构造中的蓝辉铜矿含一定量的Fe。讨论了两种蓝辉铜矿各自的形成机制及其地 质意义。     

巴布亚新几内亚奥克泰迪铜金矿床成矿特征和控制因素

巴布亚新几内亚西部Fubilan山奥克泰迪矿床是一个世界级铜金矿床,在大地构造上位于新几内亚造山带的巴布亚褶皱带。该矿床的铜金矿化赋存于Fubilan二长斑岩及其周边的磁铁矿夕卡岩和硫化物夕卡岩中。矿石类型以原生硫化物矿石为主,金属矿物包括磁铁矿、黄铁矿、磁黄铁矿、白铁矿、黄铜矿、斑铜矿等。蚀变类型包括夕卡岩化、钾化、泥化和青盘岩化。矿床氧化次生富集带发育,表生矿石矿物为蓝辉铜矿、辉铜矿、自然铜、铜蓝和银金矿。成矿作用主要受区域构造、侵入杂岩体、Darai组灰岩地层、断裂等因素的控制。根据矿床的主岩、矿石特征、蚀变特征和控矿因素,认为该矿床成因类型属于较为典型的夕卡岩一斑岩型矿床。     

Mineral chemical investigation on sulfide mineralization of the Istala deposit,Gümüşhane,NE-Turkey

The mineralogy of the Istala deposit, Gümüşhane, northeastern Turkey, was studied in detail, and a geochemical investigation was carried out using electron probe micro-analysis (EPMA). Sphalerite, galena, chalcopyrite and pyrite are the major sulfide minerals found in the Istala deposit, with minor amounts of bornite, idaite, tetrahedrite–tennantite, anilite, yarrowite, mckinstryite, covellite and chalcocite. In addition to these, barite and a small quantity of quartz occur as gangue minerals. Based on the textural relations and mineral assemblages, five different stages of crystallization have been recognized. Mineral paragenesis of the first four stages has been found to be similar, whereas clear enrichment has been observed in the modal abundance of the copper sulfide mineral assemblage at the fifth-stage ore formation. Whole-rock geochemical analyses of the Istala ore show an enrichment of Ag content up to 3328 ppm. Optical observations and EPMA study indicated that abundant silver mineralization was found in the Istala ore, especially during the later-stage ore deposition. Repetition to the presence of native silver in the samples, a significant amount of silver was incorporated in bornite, idaite, tetrahedrite–tennantite, anilite, yarrowite, mckinstryite, covellite and chalcocite, whereas a trace amount of silver has been detected in sphalerite, galena, chalcopyrite and pyrite. The homogenization temperatures (T_h) of the primary fluid inclusions were measured between 98 and 284 °C, with frequency peaks around 140 °C, 190 °C and 240 °C. All data obtained support the theory that later stage copper-rich sulfides, formed under the low temperature conditions, are responsible for the large amounts of silver content in the Istala mine.     

会理县鹿厂－大铜厂银铜矿矿石学研究

会理鹿厂－大钢厂银铜矿的矿石矿物主要由辉铜矿、蓝辉铜矿、斑铜矿、硫铜银矿、硒铜银矿及硫硒铜银矿组成，且与胶结物方解石密切共生；矿石主要是结晶粒状与交代溶蚀结构，浸染状构造。该矿床为典型的沉积成岩成因砂岩砾岩型银铜矿。     

Studies of Metallic and Trace Minerals of the Tiegelongnan Cu‐Au Deposit,Central Tibet,China

Electron probe micro-analysis(EPMA) and scanning electron microscopy(SEM) equipped with energy dispersive spectrometry(EDS) have been used to investigate the principal ore minerals and coexisting metallic mineral inclusions in polished thin sections from the Tiegelongnan deposit, which consists of a high-sulfidation epithermal system(HSES) and a porphyry system(PS). Molybdenite,chalcopyrite, bornite, tennantite, enargite, digenite, anilite, covellite, and tetrahedrite have been identified by EPMA. Intergrowth, cross-cutting and replacement relationships between the metallic minerals suggest that molybdenite formed first(stage 1),followed by chalcopyrite ± bornite ± hematite(stage 2),then bornite ± Cu-sulfides ± Cu-Fe-sulfoarsenides(stage 3),and lastly Cu-Fe-sulfoarsenides ±Cu-sulfides(stage 4). Pyrite is developed throughout all the stages. Droplet-like inclusions of Au-Te minerals commonly occur in tennantite but not in the other major sulfides(molybdenite, chalcopyrite and bornite),implying that tennantite is the most important Au telluride carrier. The pervasive binary equilibrium phases of calaverite and altaite constrain f_(Te2) in the range from ～-6.5 to ～-8 and f_(S2)-11.The intergrowth of bornite and chalcopyrite and the conversion from bornite to digenite suggest fluctuated and relatively low precipitation temperature conditions in the HSES relative to the PS.Contrastingly, the dominance of chalcopyrite in the PS, with minor bornite, suggests relatively high temperature conditions. These new results are important for further understanding the mineral formation processes superimposed by HSES and PS systems.