共查询到19条相似文献，搜索用时 341 毫秒
1.
朝山金矿床位于安徽铜陵狮子山矿田内,与成矿相关的侵入岩体为白芒山辉石闪长岩.文章通过对朝山金矿床矿石矿物含金性和方解石-黄铁矿脉内方解石及碳酸盐岩全岩碳、氧同位素研究,探讨朝山金矿床中金的赋存状态和矿床成因.矿石矿物电子探针测试表明,朝山金矿床矿石矿物中毒砂、磁黄铁矿和黄铁矿含金性较好.C,O同位素测试表明,方解石-黄铁矿脉内方解石中的δ(13CPDB)=-2.57×10-3～-4.87×10-3,δ(18OPDB)=-15.68×10-3～-17.33×10-3,δ(18OSMOW)=13.05×10-3～14.74×10-3,碳酸盐岩全岩中δ(13CPDB)=0.88×10-3～1.97×10-3,δ(18OPDB)=-7.55×10-3～-9.12×10-3,δ(18OSMOW)=21.46×10-3～23.08×10-3,说明朝山金矿床的成矿物质主要来源于岩浆或深部地壳流体.伴随着成矿作用的进行,朝山金矿床经历了从高温到低温热液蚀变过程,同时混入了地壳上部沉积物. 相似文献
2.
3.
《吉林大学学报(地球科学版)》2015,(Z1)
<正>抱伦金矿床位于中国海南省西南部乐东县境内,是一个大型中温热液金矿床。该矿床以含金石英脉为主,蚀变岩型金矿脉次之。金矿脉呈NNW方向分布在志留系浅变质碎屑岩破碎带之中。68个矿石样品的多元素分析结果表明抱伦金矿床具有富Bi高Au的特点,属于Au-Bi-(低Te)-S流体体系。抱伦金矿床的金属矿物有自然金、黑铋金矿、硫铋金矿、自然铋、辉铋矿、辉铅铋矿、斜方辉铅铋矿、硫碲铅矿、硫铋碲矿,伴生矿物以磁黄铁矿、毒砂、黄铜矿为主,还有Fe-闪锌矿、方铅矿、黄铁矿等,脉石矿物主要 相似文献
4.
在对金矿石野外观察、镜下鉴定和电子探针观察的基础上,分析了对川西锦屏山地区金矿床中金的赋存状态,并对该地区金矿床的成因和矿石的加工技术性能进行了讨论。研究发现川西锦屏山地区金矿床的金矿石中金主要以自然金和包裹金两种形式存在,自然金主要呈片状、丝状赋存于其他矿物的颗粒之间,包裹金主要赋存于黄铁矿、黝铜矿、黄铜矿和方铅矿等矿物中,呈粒状、片状和丝状。矿石中主要的金属矿物组合为黄铁矿+黝铜矿+方铅矿+闪锌矿,含有自然铜、自然银和自然碲。研究区的金矿床可能为低硫、强还原热液改造形成,矿石样品的加工需按粗粒金的流程进行,矿石属于易加工矿石。 相似文献
5.
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。 相似文献
6.
哈达门沟金矿床产于华北克拉通北缘西段，形成于伸展构造背景中，成矿流体富钾高碱且氧化性强，矿石建造中铁氧化物含量高，并且可见铁氧化物被硫化物交代的现象。文章拟揭示金在铁氧化物中的含量和赋存状态，并探讨金矿床成因。对哈达门沟金矿3种类型矿石中的黄铁矿、铁氧化物(磁铁矿和赤铁矿)单矿物进行金、铁浸取实验，结果表明：铁氧化物含金较高；黄铁矿中的金和铁的浸出曲线不同步，金浸出率与铁浸出率呈负相关，表明黄铁矿中的金主要以颗粒金形式存在；铁氧化物中金、铁同步浸出，浸出率为正相关，表明铁氧化物中的金主要以品格金和(或)胶体吸附金形式存在。哈达门沟金矿床的上述特征均表明其具铁氧化物型金矿床的特点。 相似文献
7.
8.
9.
天格尔金矿带是近年来在中天山发现的一个大型金矿带。本文从金矿围岩的含金性、岩石和矿石的稀土元素和微量元素特征、黄铁矿的硫同位素特征及矿化带中金含量的分形结构因子（ＦＳＦ）等方面探讨了金矿带的成矿物质来源。研究表明，长英质糜棱岩既是金矿脉的围岩，也是金的矿源岩，在走滑剪切作用过程中，金从矿源岩中活化并迁移出来，形成一系列剪切带型金矿床。 相似文献
10.
11.
新疆托里萨I金矿床产于托里蛇纹岩套的超镁铁岩相内,与超镁铁岩的蚀变交代作用有关.矿床地球化学研究表明该矿床的形成与海底热泉活动有关,是一种新的金矿床类型. 相似文献
12.
位于右江盆地南部的滇东南底圩金矿床是近年来新发现的一处金矿床,为理清其成因,对不同类型矿石和赋矿围岩进行了主、微量元素及硫化物的硫同位素分析。结果表明,相较于赋矿围岩,矿石中明显富集Au、As、Sb、Hg、Tl、S、K、C元素,应为热液带入;而Si、Mg、Fe、Zr和Th在矿石和围岩中变化不大,Fe主要来源于赋矿围岩。对矿床中的主要金属硫化物黄铁矿和毒砂进行的矿物学和硫同位素分析表明,载金矿物主要为含砷黄铁矿和毒砂,金可能主要以Au+的形式赋存在含砷黄铁矿和毒砂之中;含金硫化物具有较高的硫同位素组成(5.93‰~11.99‰),表明成矿所需的S主要为地壳来源。结合前人对于右江盆地南部相似金矿的研究,认为印支期造山作用使沉积物脱水形成的变质流体交代玄武岩,容矿岩石的硫化物化作用是底圩金矿床形成最重要的成矿作用之一。 相似文献
13.
Huichao Zhang Peng Chai Hongrui Zhang Zengqian Hou Shouming Chen Yanbin Sun Qing Peng 《Resource Geology》2019,69(3):270-286
The Laowangzhai gold deposit, located in the Ailaoshan gold belt (SW China), is hosted in various types of rocks, including in quartz porphyry, carbonaceous slate, meta‐sandstone, lamprophyre, and altered ultramafic rocks. In contrast to other wall rocks, the orebodies in altered ultramafic rocks are characterized by the occurrence of a large amount of Ni‐bearing minerals. The ore‐forming process of the orebodies hosted by altered ultramafic rocks can be divided into two stages: pyrite‐vaesite‐native gold and gersdorffite‐violarite stages. The contents of As and Sb increased during the evolution of ore‐forming fluid based on the mineral assemblages. Thermodynamic modeling of the Ni‐Cu‐As‐Fe‐S system using the SUPCRT92 software package with the updated database of slop16.dat indicates the fS2 in ore‐forming fluid decreases significantly from stage I to stage II. The decreases of fS2 due to crystallization of sulfides and fO2 due to fluid–rock reaction were responsible for ore formation in altered ultramafic rocks of the Laowangzhai gold deposit. Geological evidence, the in situ sulfur isotope values of pyrite, and the other published isotopic data suggest that the ore‐forming fluid for ultramafic rock ores was dominantly composed of evolved magmatic fluid with the important input of sediments. 相似文献
14.
南秦岭南部构造带具备较好的金矿成矿条件与成矿背景,是该区域规模较大金矿带.金沟矿段是黄龙金矿床最主要的组成部分,该矿段矿石中磁黄铁矿和黄铁矿发育,其中磁黄铁矿矿石是矿床中含量最高的硫化物矿石.磁黄铁矿存在两种产出状态,分别为早期形成的呈浸染状、团块状分布的磁黄铁矿与晚期形成的脉状磁黄铁矿.成分分析结果表明以单斜磁黄铁矿为主.该矿床属中-低温矿床.微量元素结果显示富Co贫Ni,与金矿化关系密切.在含金性方面,脉状产出的磁黄铁矿优于团块状分布的磁黄铁矿,且脉体越细含金性越好,因此细脉状磁黄铁矿可作为该区重要的找矿标志. 相似文献
15.
辽宁东平金矿床地质特征及找矿方向 总被引：1，自引：0，他引：1
南秦岭南部构造带具备较好的金矿成矿条件与成矿背景，是该区域规模较大金矿带.金沟矿段是黄龙金矿床最主要的组成部分，该矿段矿石中磁黄铁矿和黄铁矿发育，其中磁黄铁矿矿石是矿床中含量最高的硫化物矿石.磁黄铁矿存在两种产出状态，分别为早期形成的呈浸染状、团块状分布的磁黄铁矿与晚期形成的脉状磁黄铁矿.成分分析结果表明以单斜磁黄铁矿为主.该矿床属中-低温矿床.微量元素结果显示富Co贫Ni，与金矿化关系密切.在含金性方面，脉状产出的磁黄铁矿优于团块状分布的磁黄铁矿，且脉体越细含金性越好，因此细脉状磁黄铁矿可作为该区重要的找矿标志. 相似文献
16.
Qingdong Zeng Jianming Liu Tiebing Liu Yuanchao Shen Ping Shen Guangming Li 《Resource Geology》2007,57(3):313-324
The Sawuershan region, one of the important gold metallogenic belts of Xinjiang, is located in the western part of the Kalatongke island arc zone of north Xinjiang, NW China. There are two gold deposits in mining, namely the Kuoerzhenkuola and the Buerkesidai deposits. Gold ores at the Kuoerzhenkuola deposit occur within Carboniferous andesite and volcanic breccias in the form of gold‐bearing quartz–pyrite veins and veinlet groups containing native gold, electrum, pyrite, pyrrhotite and chalcopyrite. Gold ores at the Buerkesidai deposit occur within Carboniferous tuffaceous siltstones in the form of gold‐bearing quartz veinlet groups and altered rocks, with electrum, pyrite and arsenopyrite as major metallic minerals. Both gold deposits are hosted by structurally controlled faults associated with intense hydrothermal alteration. The typical alteration assemblage is sericite + chlorite + calcite + quartz, with an inner pyrite–sericite zone and an outer chlorite–calcite–epidote zone between orebodies and wall rocks. δ34S values (0.3–1.3‰) of pyrite of ores from Kuoerzhenkuola deposit are similar to those (0.4–2.9‰) of pyrite of ores from Buerkesidai deposit. δ34S values (1.1–2.8‰) of pyrite from altered rocks are similar to δ34S values of magmatic or igneous sulfide sulfur, but higher than those from ores. 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb data of sulfide from ores range within 17.72–18.56, 15.34–15.61, and 37.21–38.28, respectively. These sulfur and lead isotope compositions imply that ore‐forming materials might originate from multiple, mainly deep sources. He and Ar isotope study on fluid inclusions of pyrites from ores of Kuoerzhenkuola and Buerkesidai gold deposits produces 40Ar/36Ar and 3He/4He ratios in the range of 282–525 and 0.6–9.4 R/Ra, respectively, indicating a mixed source of deep‐seated magmatic water (mantle fluid) and shallower meteoric water. In terms of tectonic setting, the gold deposits in the Sawuershan region can be interpreted as epithermal. These formations resulted from a combination of protracted volcanic activity, hydrothermal fluid mixing, and a structural setting favoring gold deposition. Fluid mixing was possibly the key factor resulting in Au deposition in the gold deposits in Sawuershan region. 相似文献
17.
银洞坡金矿位于桐柏县围山城金银矿带的中部,为一超大型金矿床,伴生银、铅锌。对金矿石中主要成矿阶段流体包裹体进行了详细的岩相学、显微测温及激光拉曼光谱成分研究,结果表明：金矿石中发育气液两相包裹体、富气相包裹体和含CO2三相包裹体,流体成分为H2O NaCl CO2体系,含少量N2、CH4、H2S和H2。流体不混溶是导致矿质沉淀的主要因素。3类包裹体的均一温度为1692～3992 ℃,流体盐度为18%～122%,其中含CO2三相包裹体的盐度明显小于气液两相包裹体的盐度。利用不混溶体系估算得到包裹体的捕获压力为62～1263 MPa,成矿深度为52 km左右。矿石中黄铁矿的δ34S为16‰~33‰,围岩中纹层状黄铁矿的δ34S为33‰～62‰,矿石中的δ34S小于围岩中δ34S值,表明成矿物质中的硫可能来源于地幔硫和围岩硫的混合。 相似文献
18.
系统的矿相学研究表明,太阳山金矿矿石矿物主要为黄铁矿、磁黄铁矿、含银自然金、闪锌矿、黄铜矿;矿床围岩蚀变种类较多,主要有硅化、绢云母化、钾长石化、石墨化。矿石结构包括自形—半自形粒状结构、假象结构、压碎结构、包含结构、错断结构等,矿石构造包括浸染状、微脉浸染状、脉状、网脉状构造。金主要以包裹金、粒间金、裂隙金、赋存于石英、黄铁矿、磁黄铁矿中。矿区内常见的是碎裂岩和糜棱岩化岩石,很少见到糜棱岩,不存在超糜棱岩、构不成糜棱岩系列。本矿床地质特征与典型的破碎带蚀变岩型金矿山东焦家金矿极为相似。因此,太阳山金矿属于典型的破碎带蚀变岩型金矿。 相似文献
19.
The Nature of Ore‐forming Fluids of the Carlin‐type Gold Deposit in Southwest China: A Case from the Zimudang Gold Deposit 
下载免费PDF全文
下载免费PDF全文 The Zimudang gold deposit is a large Carlin‐type gold deposit in the Southwest Guizhou Province, China, with an average Au content of 6.2 g/t. Gold is mainly hosted in the fault zone and surrounding strata of the F1 fault and Permian Longtan Formation, and the ore bodies are strictly controlled by both the faults and strata. Detailed mineralogy and geochemistry studies are conducted to help judge the nature of ore‐forming fluids. The results indicate that the Au is generally rich in the sulfides of both ores and wall rocks in the deposit, and the arsenian pyrite and arsenopyrite are the main gold‐bearing sulfides. Four subtypes of arsenian pyrite are found in the deposit, including the euhedral and subhedral pyrite, framboidal pyrite, pyrite aggregates and pyrite veins. The euhedral and subhedral pyrite, which can take up about 80% of total pyrite grains, is the dominant type. Au distributed unevenly in the euhedral and subhedral pyrite, and the content of the Au in the rim is relatively higher than in the core. Au in the pyrite veins and pyrite aggregates is lower than the euhedral and subhedral pyrite. No Au has been detected in the points of framboidal pyrites in this study. An obvious highly enriched As rim exists in the X‐ray images of euhedral pyrites, implying the ore‐forming fluids may be rich in As. The relationship between Au and As reveals that the Au may host as a solid solution (Au+) and nanoparticles of native gold (Au0) in the sulfides. The high Co/Ni ratio (>1) of sulfides and the enrichment of W in the ores all reflect that the gold‐bearing minerals and ore‐forming process were mainly related to the hydrothermal fluids, but the magmatic and volcanic activities cannot be neglected. The general existence of Au and As in the sulfides of both ores and wall rocks and the REE results suggest that the ore‐forming fluids may mainly be derived from the basin itself. The enrichment of Tl suggests that the ore‐forming fluids may be enriched in Cl. The Ce and Eu show slightly or apparently negative anomalies, which means the ore fluids were probably formed under reducing environment. The Y/Ho ratios of ore samples fluctuate around 28, implying the bicarbonate complexation and fluorine were both involved in the ore‐forming process. Combined with the previous studies and our results, we infer that the ore‐forming fluids enriched Au, As, HS? and halogen (F, Cl) were derived from the mixture of reducing basinal fluids and magmatic or volcanic hydrothermal fluids. 相似文献