吉林白山金矿金的赋存状态与分布规律研究

应用高级光学显微镜、化学分析、X射线粉晶衍射物相分析、电子探针、扫描电子显微镜等多种手段对吉林白山金矿金的赋存状态进行了系统的研究。结果表明,该矿床主要矿石类型为硅化构造角砾岩型,金矿物种类有自然金、含银自然金和银金矿,石英是金的主要载体矿物。金矿物的赋存形式有粒间金、包裹金和裂隙金,分别占89.27%、6.42%和4.31%。金矿物以微粒金为主,大小为0.001～0.005mm,形态以粒状、麦粒状居多,金矿物成色高,矿床应属中偏高温成因。     

新疆伊宁金山金矿床金的赋存状态

新疆伊宁金山大型金矿床为一典型的浅成低温热液型金矿床。利用显微镜观察、电子探针扫描、物相分析、化学分析等综合分析技术对金矿石中金的赋存状态进行了研究。结果表明,金主要以独立矿物相存在,金的载体矿物主要为黄铁矿、石英和褐铁矿。金矿物以自然金为主(成色为969.6~997.8),含银自然金、银金矿较少。金的嵌布类型有粒间金、包裹金、裂隙金和连生金4种。矿石中自然金的粒度主要以显微微粒金(0.01~0.005mm)为主(约占60%),其次是显微极微粒金(0.005~0.0002mm)(约占26.6%)。尽管显微中粒-细粒金数量不太多,但它对矿石品位和储量来说是重要的。     

综合分析技术在微细粒浸染型金矿金赋存状态研究中的应用

采用化学组分分析、物相分析、粒度筛析、X射线面扫描分析、矿物分离分析并结合数理统计分析等综合分析技术对微细粒浸染型金矿进行工艺矿物学研究,较为快速、准确地查明该金精矿金的赋存状态.几种分析方法互为补充,结果吻合.     

贵州省从江翁浪金矿床金的赋存状态和金矿物特征

从江翁浪金矿是黔东南地区蚀变岩型金矿的典型代表.前人对翁浪金矿的研究仅限于宏观的构造及围岩蚀变等方面,同时对该金矿床容矿岩石及矿石物质组分作过初步研究探讨.在前人工作的基础上,采用矿相鉴定、化学分析、单矿物试金分析、电子探针及X射线衍射等多种物理化学分析手段,对翁浪金矿床中金矿物类型、形态、成色、嵌布特征以及金的赋存状态、载金矿物等做了细致的微观分析研究.     

贵州兴仁紫木凼金矿岩石矿物特征及金的赋存状态初步研究

紫木凼金矿是我省近年来发现的一种新类型金矿.本文着重对含金岩石、矿物、矿石结构构造及金的赋存状态进行了研究。可见金、不可见金主要为自然金,呈显微粒状、次显微粒状。氧化矿中游离金高达96％以上.金主要在褐铁矿及粘土矿物之中富集.     

西藏尕尔穷铜金矿金矿物特征研究

尕尔穷铜金矿床是班公湖-怒江成矿带西段第一个达到详查程度的矽卡岩型铜金矿床。通过对矿床中金矿物的电子显微镜观察和扫描电镜能谱分析,查明了金矿物的类型及赋存状态,划分了成矿阶段。研究表明,金矿物有银-金矿物系列、铜-金矿物系列和少量碲化物类,主要有自然金、银金矿、金银矿、铜质金银矿、铜金矿、铜质银金矿和碲金银矿。金矿物主...     

利用电子探针研究甘肃陇南赵家庄金矿载金矿物特征

应用偏光显微镜与电子探针相结合的手段是研究载金矿物的主要方法。本文采用镜下鉴定和电子探针分析技术,对赵家庄金矿中载金矿物含量、形态特征及其与其他矿物的空间关系开展研究,并对载金矿物进行定性和定量分析,探寻具有找矿意义的载金矿物和总结标志矿物特征。结果表明:研究区金矿石中主要载金矿物为黄铁矿,少量为黄铜矿、闪锌矿,这些载金矿物中Au含量依次为:细晶黄铁矿粗晶黄铁矿草莓状黄铁矿黄铜矿。不同时期的黄铁矿(粗晶黄铁矿、细晶黄铁矿、草莓状黄铁矿)中Au的分布均匀,但存在差异性,主要表现为细晶黄铁矿和草莓状黄铁矿中的Au含量较高(平均含量0. 14%～0. 18%),这种现象表明此类矿物为构造热液期形成,金易富集。Au以两种形式存在,一种是"可见金"包裹于脉石矿物中,或以裂隙金的形式嵌布在矿物晶隙及裂隙中;另一种是"不可见金"以纳米级颗粒金的形式存在于载金矿物中,也是Au的主要存在形式。本研究为后期矿床的成因、成矿过程和成矿机理研究提供了佐证,同时易于根据含金矿物的特征选择合适的选冶方法。     

安徽白岭金矿金的赋存状态研究

白岭金矿位于下扬子台坳、长江褶断隆起带中段。金矿体赋存于三叠系中统铜头尖组中，矿体形态呈不规则脉状。矿石类型主要有以含金褐铁矿为主的氧化矿石和以含金黄铁矿为主的原生矿石两大类。载金矿物主要有黄铁矿、褐铁矿、石英、伊利石、黄铜矿等。通过矿相鉴定，单矿物含金分析、物相分析、多点分析、电子探针分析等，查明了金的赋存状态。金矿物以自然金为主，其次为银金矿。金的粒度较细，主要为中细粒显微金。金的嵌布类型有包体金、晶隙金、裂隙金。金的成色较高，平均为906．5。金主要呈矿物态存在。     

玲珑金矿大开头矿区金的赋存特征及其成因意义

金赋存状态的研究,不仅可为金矿选冶提供技术参数,还有成因和化探等方面的意义。通过玲珑金矿大开头矿区金及主要矿石矿物的电子探针分析,显示出金只以独立金矿物相形式;金矿物主要为银金矿和含银自然金;金矿物以裂隙金、粒问金和包体金存在于黄铁矿或石英等颗粒中,但主要是存在于黄铁矿的裂隙中和硫化物与石英之间的晶体间隙中。金矿形态有极细的脉状、角砾状、麦粒状、浑圆粒状和不规则粒状等;粒状金矿物粒度细小、多在10μm左右;细脉状金的脉宽多在1-5μm之间。以黄铁矿为主的硫化物化学成分中几乎不舍金,金仅呈独立金矿物相。根据金与硫化物和石英的相嵌关系,探讨了本区金成矿作用过程。     

河南吉家洼金矿床矿石特征及金的赋存状态

通过对吉家洼金矿床矿石特征及金的赋存状态的研究,讨论了该矿床的矿石类型、结构构造、物质组成、矿物成分、金的赋存状态等.研究表明,该矿床矿石类型以氧化矿石为主,深部原生矿石逐渐增多.矿石中矿物种类多样,主要金属矿物为黄铁矿,脉石矿物以石英、斜长石、绢云母为主.金矿物主要为自然金,在矿石中分布极不均匀,以粒间金和裂隙金为主要赋存形式,粒度介于0.005~0.1 mm之间,金矿物的成色变化具有阶段性和分带性特征,受成矿温度控制明显.     

Gold Mineralization in Listvenite, the Sayi Gold Deposit, Xinjiang

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福建尤溪肖板金矿床金的赋存状态及金矿物特征

肖板金矿床属受构造控制的中低温岩浆热液矿床,矿化类型为构造蚀变岩型。金多呈独立金矿物形式出现,少许呈分散状;金矿物以自然金为主,平均成色９３０,有少量银金矿和碲金矿。金矿物以包体金、裂隙金、连生金和粒间金等形式嵌布于黄铁矿、黄铜矿、石英、方铅矿及方解石等主要载金矿物中,且石英、方解石中较金属硫化物中占优势。金矿物形态各异,粒度以中细粒为主。     

甘肃阳山金矿带构造岩浆演化与金矿成矿

甘肃阳山金矿带位于西秦岭南部,结合同位素测年资料发现阳山金矿区在侏罗纪早期、白垩纪早期及第三纪早期曾发生3期岩浆活动;稳定同位素分析结果显示,矿石中石英的流体包裹体δD值为-75‰～-56‰,δ¹⁸O_H2O为3.7‰～12.2‰,矿脉中黄铁矿及辉锑矿的δ³⁴S为-2.2‰～-0.7‰,表明阳山金矿成矿热液及成矿物质主要来自于岩浆作用;构造变形分析显示该区在三叠纪曾发生韧性变形,在侏罗纪早期产生韧-脆性变形;侏罗纪晚期以后区内构造转为脆性,早期以逆冲推覆构造为主,晚期主要为脆性伸展活动。结合该区地质构造演化史认为本区的3期岩浆活动与区域伸展作用有关,而与岩浆侵入有关的多期岩浆热液活动是促成阳山金矿床形成的主要因素。     

Baolun Gold Deposit, An Orogenic Gold Deposit in Hainan Province,South China

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Ore-Forming Fluid Characteristics of the Dayingezhuang Gold Deposit, Jiaodong Gold Province, China

The Dayingezhuang gold deposit is located in the central part of the Zhaoping Fault Zone, which is one of the most important gold-hosting faults in the Jiaodong gold province of China. Dayingezhuang is a typical large-scale shear zone-hosted disseminated gold deposit with superimposed silver mineralization. Fluid inclusion (FI) petrography and microthermometry, and analysis of oxygen and hydrogen isotopes for fluid inclusions were conducted to determine the characteristics of the ore-forming fluids and the processes of silver mineralization. Microthermometry data of FI indicated that ore-forming fluids are characterized by low salinity and low density. Homogenization pressures of FI are estimated at 20 × 10⁵–220 × 10⁵ Pa. The change in ore-forming fluids from K₂SO₄ type to NaCl type indicates the superposition of two hydrothermal mineralizing events. Ore-forming fluids were dominated by magmatic components in the early mineralization period, and affected by meteoric waters in the late period. Gold may have been transported as Au-S or Au-Cl complexes, whereas silver was transported as Ag-Cl complexes. Early fluid boiling and later fluid mixing are thought to be two of the main factors causing the deposition and superimposing of gold and silver to form the large deposit.     

Gold Grade and Tonnage Models of the Gold Deposits, China

Abstract: The gold grade and tonnage modelling is applied to some types of the gold deposits in China, including placer, Archaean lode, slate belt, Carlin, volcanogenic, skarn and Shandong Peninsula, among others. The Shandong Peninsula type denotes the gold deposit, which was formed in an intensely reshaped Archaean greenstone belt. The modelling results show: (1) the Archaean lode gold deposits of China are similar to the Homestake type in gold grades. (2) The Chinese slate belt type gold deposits are marked by moderately lower gold grades but considerably larger ore volumes than the similar type elsewhere. (3) The Carlin style gold deposits of China are identified by higher Au grades but evidently smaller sizes in comparison with their counterparts in western North America. (4) The volcanogenic (continental) style is similar to Sado epithermal veins in gold grade‐tonnage models and general characteristics while volcanogenic gold deposits of the oceanic subgroup contrast with Kuroko‐type deposits in the gold grade model. But the Chinese volcanogenic (oceanic) subtype (Palaeozoic age) shows similar higher gold grades to those of the Palaeozoic Kuroko‐type deposits elsewhere. (5) Porphyry and skarn gold deposits tend to have a large size but low grade. (6) Less than half of the Shandong Peninsula gold deposits are of ore volumes exceeding the 50th intercept of the relevant gold tonnage model, implying possible undiscovered gold deposits with a larger size in the peninsula. (7) In general, Chinese gold deposits of larger sizes tend to have lower gold grades in relation to gold grade models. (8) Gold grade‐tonnage models can be effectively influenced by how to include or exclude non‐economic gold resources in the modelling. Ore volumes of gold deposits actually to some extent depend on gold grades. Consequently, the way of including or excluding low‐grade values may effect a gold grade‐tonnage model and cause different interpretation of the modelling results. This is particularly true to the gold deposits, which generally show an inverse correlation between gold grade and tonnage.     

Genesis of the Shear Zone-related Gold Vein Mineralization of the Lega Dembi Gold Deposit, Adola Gold Field, Southern Ethiopia

The Lega Dembi Primary Gold Deposit in southern Ethiopia is related to the shear zone-hosted vein in the Neoproterozoic metamorphosed volcano-sedimentary succession of greenschist- to amphibolite-facies metamorphism. The rocks consists of a sequence of biotite-feldspar-quartz schists, carbonaceous mica-schists, amphibolites and basic to ultrabasic rocks. This unit is separated from a foot wall biotite gneiss by a major shear zone. The ore bodies are hosted in the volcano-sedimentary sequence and consist of swarms of quartz veins, lenses, and stockworks that propagated along mesoscale ductile to brittle-ductile shear zones.The mineralization is defined by a complex paragenesis of gold in association with Cu-Pb-Zn-Fe sulphides, tellurides and sulphosalts. The presence of Ni-bearing minerals in amphibolites of the host sequence, together with the ore mineral association, suggests an origin related to mafic volcanism.     

Invisible Gold from the Hishikari Epithermal Gold Deposit, Japan: Implication for Gold Distribution and Deposition

Abstract. The presence of invisible gold was confirmed in arsenian pyrite from the Hishikari epithermal gold deposit, Kagoshima, Japan, by means of EPMA and SIMS analyses. The relative concentration of invisible gold may be positively correlated with As contents (0.01 to 10.37 wt%) of fine-grained arsenian pyrite which commonly occurs in the auriferous quartz veins. Although arsenian pyrite occurs widely in any mineralization stage with electrum and other sulfide, sulfosalts, selenide or telluride minerals, arsenian pyrites having higher As contents accompanied by invisible gold occur dominantly in the middle stage of fine-adularia-quartz and in the late stage of coarse-quartz rather than in the early stage of columnar-adularia.     

Hydrothermal Alteration and Gold Mineralization in the Jiaojia Gold Deposit,Jiaodong Peninsula, China

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贵州水银洞金矿床矿石特征及金的赋存状态

详细阐述了水银洞金矿床的矿石物质组成、化学成分、结构构造、矿物嵌布特征，初步划分了成矿期及成矿阶段，对金的赋存状态进行了初步研究。