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1.
The gold deposits,occurring in the south subzone of western Qinling,are the only typical and important strata-bound gold deposits,which are associated with submarine exhalative sedimentation.The gold deposits include the La‘erma ore deposit,the Qiongmo ore deposit and the Yaxiang ore occurrence.They are hosted i the Cambrian silicalite formation composed of black chert and slate.The presence of typical chert offers important evidence to evaluate the possible submarine exhalative system and its role in the formation of the gold deposits,which are closely associated with peroclation and diffusion in the horizontal,vertical and axial directions,Element-assemblage zonation is clearly seen due to differences in element concentrations in different directions,Such a zonation makes gold.selenium,uranium,copper,stibium,molybdenum,mercury,etc,precipitate in the form of simple or composite orebodies.The establishent of the element-assemblage zonation is highly helpful for evaluating directly the metallogenesis of gold deposits. 相似文献
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Gold is one of the most important mineral resources in China with its rich mineral resources. In recent years,significant progress has been made on the process of gold resource exploration. Some large and giant gold deposits were newly found and some important expansions in the main mining regions were also been completed. Studies on metallogenic regularity of gold deposits in China also have made achievements with a long–term work. This review aims to conclude the achievements of research on gold metallogenic regularity in China. Based on the data of about 2000 gold deposits and other ore(mineralized) occurrences,gold deposits in China were classified into five prediction types: gold deposits genetically related to granite–greenstone formation,gold deposits related to sedimentary formation(including the Carlin type and the metamorphosed clastic rock related vein gold deposit),gold deposits genetically related to volcanic rocks(including the continental and marine types),gold deposits genetically related to intrusions(including the porphyry type and the inner intrusion and contact zone related gold deposit),gold deposits of supergenesis(including fracture zone–altered rock gold deposit,placer gold deposit,gossan type gold deposit and soil type gold deposit). Statistics on precise chronology data of gold deposits indicate that there occurred 5 main periods of gold–mineralization in geological history of China. They were Neoarchean to Paleoproterozoic,Meso–Neoproterozoic,Paleozoic,Mesozoic,and Cenozoic. Gold deposits in China mainly formed in the Mesozoic and the Cenozoic. On the studies of the spatial–temporal distribution characteristics of gold deposits,53 gold–forming belts were delineated in China. The metallogenic regularity of gold deposits was preliminarily summarized and 71 gold metallogenic series were proposed in China. This suggests that it is necceary to deepen the study on metallogenic regularity of gold deposits and to provide the theory guide for the ore–prospecting for gold resources in China. 相似文献
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FENG Jianzhong ZENG Yishan FU ShuixingPeking University Beijing Beijing Institute of Geology for Mineral Resources Andingmenwai Beijing 《《地质学报》英文版》2000,74(3):559-564
As a typical Palaeozoic island arc system, the eastern Tianshan area, Xinjiang, is different from eastern China but similar to the Meso-Cenozoic island arc metallogenic provinces along the coast of the Pacific Ocean in metallogenic environment, geology and geochemistry. Three types of gold deposits, ductile shear zone-hosted gold deposits (Kanggur ), magmatic hydrothermal gold deposits (Jinwozi) and volcanic- or subvolcanic-hosted gold deposits (Xitan and Mazhuangshan), have been identified in this area. Regionally, gold deposits are structurally controlled by the Kanggur Tag ductile shear zone, Shaquanzi fault, Hongliuhe fault and Yamansu fault. Generally, gold mineralization occurs in the transition zones from volcanic rocks to sedimentary rocks. The horizon bearing well-developed jasper is an important indicator for gold mineralization. Each of the three types of gold deposits has its distinctive metallogenic background and geological-geochemical characteristics. 相似文献
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正Objective"Orogenic gold deposits,"which account for 30%of global gold resources (Frimmel and Hennigh,2015),is one of the most important types of gold deposits in the world.This kind of gold deposit is supposed to have spatial and temporal distribution association with the accretionary orogenic belt.The Ailaoshan Gold Belt,where there are many large orogenic gold deposits including Jinchang,Daping,Laowangzhai,Donggualing,and Changan,contribute substantially to Chinese gold resources.The Himalayan orogen and Ailaoshan Orogen,both have experienced the early accretionary orogenesis and the subsequent collisional orogenesis are one of the 相似文献
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Geochemical data of altered wall rocks are important for the metallogenic prognosis of hydrothermal gold deposits. Indicator elements of altered wall rocks such as K, Al, As, Sb, and Hg have been successfully used to assess gold anomalies in lithogeochemical survey. However, such researches have rarely been done in stream sediment survey for the exploration of gold from various landscapes. On the basis of the geochemical analysis of altered wall rocks of gold deposits in the cold desert areas of Gansu (甘肃) Province in Northwest China, it is found that the combination of Al, K, and Sn could serve as an important indicator of hydrothermal gold deposits and can be used to evaluate the metallogenic prospective of gold anomalies in stream sediments. More studies performed in the cold grassland areas and the moderate-low relief mountainous areas showed that, both weak and strong geochemical anomalies can be extracted, if strictly abiding by the ways of calculation and addition of the binary values of the indicator elements with equal weight, and this provides the sound delineation of metallogenic perspective areas. 相似文献
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朱赖民 《中国地球化学学报》1998,17(4):362-371
The relations between ultrabasic rocks and gold deposits in time,space and genesis are discussed in this paper,the research results show that the ore-forming materials of the gold deposits is characteristic of crust-mantle mixing,The formation of the gold deposits is related with the activity of juvenile fluids along with the intrusion of ultrabasic dikes.The ascending juvenile fluids not only offered part of the gold.water and mineralizers for gold mineralization but also promoted the remobilization,deposition and enrichment of gold in crustal sediments. 相似文献
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A New Genetic Type of Gold Deposits-Meso-Epithermal Carbonate-Type Gold Deposits as Exemplified by the Baguamiao Suprlarge Gold Deposit 总被引：1，自引：0，他引：1
Gold deposits of the meso-epithermal carbonate type were first proposed based on the study of the Baguamiao gold deposit.This new type of gold deposits has many unique characteristics as follows:(1)Obviously strata-bound.The gold deposits are hosted in Middle Devonian turbidite formations;(2)Structrually controlled.Struc-ture is an important factor leading to metallogenesis of this type of gold deposits.The shape and distribution of orebodies are controlled by byittle-ductile shear zones;(3)Multi-stage wall-rock alteration.According to the characteristics of mineral assemblage,gold mineralization can be classified into three stages in association with various wall-rock al-terations.Wall-rock alterations closely genetically related to the gold mineralization are ankerization ,silicification,pyrrhotization and pyritization ;(4)Mineral compositions of the orebodies are mainly pyrrhotite,pyrite,marcasitolite,chalcopyrite,quartz,ankerite,and sericite.Gold mineralization is associated closely in space and time with iron sulfides;(5)Rare elements and REE in ores are low in contents relative to those of the crust.Au content varies from 1.91g/t to 11.15g/t ,averaging 5.5g/t;(6)Studies of sulfur,hydrogen,oxygen and carbon isotopes in main gangue minerals (quartz and ankerite)indicate that fluids and ore-forming materials came from deep-seated sources;(7)Three types of inclusions are recognized in terms of their composition and the vapor amounts of inclusions.The homogenization temperatures of inclusions range from 210℃to 310℃,averaging 230℃,showing that this type of gold deposits belongs to the meso-epithermal type;(8)Metallogenic age of this type of gold deposits is similar to that of the collision between the Yangtze Plate and the North China Plate,indicating that gold deposits of this type are genetically related to continental-margin plate activity. 相似文献
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Geochemical characteristics of the Upper Archean-Lower Proterozoic Jiaodong Group-the host rocks of the famous Jiaodong gold deposit are described in this paper.It is shown that the Jiaodong Group is an important Au-bearing formation containing 19.5 ppb Au on average, about 5 times as much the abun-dance in the crust.It is also found that the distribution of gold in the strata is uneven and that plagioclase amphibolite is the prospective Au -bearing rock.In the processes of regional metamorphism, migmatization and fault -remelting ,gold in the source bed was remobilized and concentrated to from various types ofgold deposits in this province. 相似文献
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<正>The Ailao Mountain is one of the most important metallogenic belts of polymetallic deposits in the Sanjiang region,southwestern China.Located in the southern segment of this metallogenic belt,the newly-discovered Chang’an gold deposit is large in scale(Fig.1A),and has attracted much attention among geologists.The ore-hosted 相似文献
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Caledonian gold deposits are widely distributed in South China.They are developed in both South China Caledonian fold belt and adjacent Proterozoic Jiangnan uplift.The host rocks are Proterozoic metamorphosed microclastic rocks in the Jiangnan uplift and Proterozoic and Cambrian strata,as well as Chengjiang and Caledonian igneous bodies in the South China flod belt.The distince differences between the Caledonian and the most developed Yenshanian glod deposits in South China are reflected in age and host-rock type,relations to Yenshanian magmatic activities,element association,mineral assemblage and glod deposit type.The studies have proven hat the Caledonian epoch is a principal metallogenic period of gold deposits in South China.This conclusion is of very important enlightening significance in exploration of Caledonian gold deposits in South China as well as in other Caledonian fold belts and adjacent uplifts in China. 相似文献
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中国金矿矿产预测评价模型及资源潜力分析 总被引：1，自引：0，他引：1
在全国金矿资源潜力评价基础上,将全国金矿矿产评价模型总结为12类:与中深成侵入岩有关的热液型、破碎蚀变岩型、斑岩型、矽卡岩型、海相火山岩型、陆相火山岩型、微细浸染型、变碎屑岩地层中热液型、绿岩建造型、砂金型、风化壳型和砾岩型。其中,以与中深成侵入岩有关的热液型、破碎蚀变岩型、微细浸染型为主,其预测资源量约占总预测资源量的38%,21%和14%。根据资源量的空间分布及成矿地质背景划分了55个金矿成矿区带,通过对不同成矿区带对预测资源量、累计查明资源储量统计分析,金矿主要集中分布于胶东、华北地台南缘、西秦岭、东秦岭、辽东、滇黔桂、哀牢山成矿带等。根据金矿的成矿地质背景,结合金矿资源潜力及近年来金矿勘查进展,对下一步的工作部署提出参考建议。 相似文献
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Gold in Madagascar 总被引：1，自引：0，他引：1
Andriamampianina Roger Rambeloson 《Gondwana Research》1999,2(3):423
Gold is commonly found throughout the Precambrian basement exposed in the eastern two-thirds of Madagascar, composed of Archean and Proterozoic greenstone belts and metasediment belts. Gold occurs in four main kinds of deposits:- as a diffuse component of the crystalline basement rocks, - in concordant quartz veins within the metamorphic rocks of the Precambrian basement, - in recent discordant veins, - and in recent and ancient alluvial deposits.The initial gold mineralisation is probably in relation with the greenstone belt formation, and many have been formed and/or reworked during different metamorphic and magmatic events. It is therefore difficult to obtain an accurate age of the different kinds of deposits. 相似文献
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中国卡林型金矿床金的赋存状态研究 总被引：18，自引：0，他引：18
卡林型金矿的载金矿物主要为黄铁矿和粘土矿物，其次是毒砂和石英。金主要以包裹金形式存在，秦岭地区存在有单体金。金主要赋存在含砷的铁硫化物相中。氧化矿石以游离金大量出现为特征。 相似文献
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卡林型金矿石中金的赋存状态分析新方法 总被引：1，自引：1，他引：0
卡林型金矿富含有机质,金主要呈显微一超显微分散状态存在,利用工艺矿物学参数自动检测分析仪(MLA)及传统化学方法只能大致判断矿石中金的赋存趋势,无法对其赋存状态准确定量.本文利用MLA仪器系统分析贵州回龙卡林型金矿,测得矿石中金主要以显微-超显微状态包裹于黄铁矿和毒砂中,少量被脉石等其他矿石包裹;黄铁矿约66％完全解离,而毒砂仅30％完全解离,载金矿物与其他矿物连生或者被包裹,将不利于硫化物包裹金的浸出.结合回龙金矿石中金的赋存特征和富含有机质的特点,对传统的物相分析流程进行改进,调整了硫化物包裹金和碳酸盐包裹金的浸出顺序,提出裸露金-碳酸盐包裹金-硫化物包裹金-硅酸盐包裹金的浸出流程,在裸露金及碳酸盐包裹金浸出时加入活性炭,利用竞争吸附抑制矿石中有机炭对金的吸附,降低有机炭对分相的影响.对比试验结果表明,采用改进的方法,有机炭含量在1％左右的金矿石分相时加入活性炭对各相测定值的影响不大;先浸出碳酸盐包裹金,再测定硫化物包裹金,各相的测定数据更加准确.改进的方法(加活性炭)用于测定回龙金矿中裸露金和碳酸盐、硫化物、硅酸盐包裹金,含量分别为1.25％、84.17％、11.46％和3.13％,与选矿试验结果相一致,表明该法适合应用于卡林型金矿中金的赋存状态分析. 相似文献
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焦家金矿主矿区金矿石的赋存特征 总被引：2，自引：1，他引：1
焦家金矿带是莱州-招远金矿区最重要的金矿带之一,产状复杂且性状变化较大。以往研究主要针对矿物种类、载金矿物及其形状及嵌布关系等进行分析,缺乏对金粒矿物学、金矿物种类及金颗粒的成色研究。本文采用偏光/反光显微镜、体视显微镜、扫描电镜、能谱仪、X射线衍射仪等技术手段对焦家金矿主矿区深部开采的矿石样品进行分析,研究内容主要包括金赋存状态、金粒度、金形状、金矿物类型及不同大小金粒的成色特征。结果表明:载金矿物主要以黄铁矿、黄铜矿等硫化矿和石英、长石等脉石矿物为主。金赋存状态有裂隙金(64.82%)、包裹金(19.29%)、晶隙金(15.89%);黄铁矿、黄铜矿中金粒较大,连群分布占多数,脉石中金粒细小,孤立分布占多数。金矿物形状复杂,主要有球状金、三角形金、矩形金。金矿物种类丰富,以自然金、银金矿、自然银、含铁自然银为主,其次为金铜矿、螺硫银矿、碲化金银。金矿物粒度范围较大,大金颗粒可达到90~110 μm,小金颗粒只有2~3 μm。金银矿物的成色普遍较高,大粒金成色低,以银金矿为主,小粒金成色高,大都为自然金。本文丰富了焦家金矿矿物学研究的内容,为后续选冶工艺提供了调控依据和重要信息。 相似文献
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含粗粒金矿石品位分析试样的加工制备 总被引：2，自引：1，他引：2
本文介绍了加工制备含粗粒金矿石的分析样品。对矿石含金品位低、脉石矿物硬度比较小类型的金矿全巷大样,在加工制样中筛上收>0.5mm大粒金。粒度<0.5mm矿石经缩分取样,用重选(摇床)富集粗粒金,分别检测结果,最终计算矿石总含金品位。实践表明,经本法加工试样检测结果所计算的金品位具有可靠性。 相似文献