Simulation of rock mass balance of two typical altered rocks in Wulong gold deposit of Liaoning, China

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Emplacement mechanism of the super-large Jingshan gold deposit in Jiangxi, China

Jingshan superlarge gold deposit is a typical deposit closely related to the ductile shear zone, developing the economic enrichment during the transition form the ductile deformation to the brittle deformation. The ore-forming process of Jingshan Au deposit can be described as the development of marine volcanic-turbidity current Au-bearing initial sedimentation → regional metamorphism and the first enrichment → strong transformation of dynamic metamorphism and deformation→ore-controlling and ore-holding of ductile shear structure→supperimposed transformation and enrichment of magma-hydrothermal solution. This process can be summarized as the “source-migration-accumulation” metallogenic-geochemical process of Au. The proved Au reserve of this deposit has exceeded 100 t and its prospect of searching for ore is considerable. So it is called the only super-large gold deposit in the south of the lower reach of the Yangtze River, China. Project supported by the Key Program of the 8th Five-Year Plan of China Synopsis of the first author Li Peizheng, associate professor, born in Dec. 1948, majoring in Geotectonic and Metallogent Gold Deposits Geochemistry.     

河南卢氏桃花金矿床地质特征及控矿因素

桃花金矿床位于苍房－胡家院加里东期石英脉型金成矿带上，区域性的瓦穴子－鸭河口断裂从矿区中部通过，是复经加里东－燕山期的历次地质事件形成的由北向南逆冲推覆构造，含金石英脉分布在该断裂以北，数量多，密度大，其走向近南北，受次级南北向断裂控制，石英脉中金的富集与黄铁矿含量成正相关关系，与烟灰色硅化及碳酸盐化关系密切，蚀变带宽，蚀变强烈时金品位较高，宽坪群地层为金的主要矿源层之一，区域性的瓦穴子－鸭河口断裂与矿区北部－韧性剪切带的叠加部位是成矿的有利地带，岩浆活动除为金矿化提供了热源和有利的物化环境之外，其本身也为成矿提供了部分物质来源。     

河北金厂峪金矿床的数字矿床三维模型构建与空间展布规律分析

金厂峪金矿床的围岩为斜长角闪片麻岩和角闪岩类岩石,其遭受动力变质后形成片岩带与矿体密切相关。以探矿者软件为工作平台,建立了该矿床的三维数字矿床模型。通过收集和整理研究区的地质图、地形图、勘探线地质剖面图、钻孔柱状图,建立地质数据库;在此基础上,系统分析区域地质背景,总结区域成矿规律和控矿要素,构建主要控矿地质体的三维实体模型。从模型中清晰可见矿体主要赋存在片岩带中,且严格受构造控制,呈脉状产出,从而证实了三维数字矿床模型的有效性。     

甘肃观音山金矿床地质特征及矿床成因

观音山金矿床产于下石炭统海相浅变质火山岩系内,主要含矿地层为下石炭统白山群下岩组绿泥石片岩,矿体严格受东西向的区域性大断裂和其旁侧的北北东向、北北西向及与之近于平行的次级断裂的控制.矿石类型有石英脉型和构造蚀变岩型:石英脉型矿化连续性差,品位高、变化大(w(Au)3 5×10-6～118×10-6),可见大量自然金,其粒度一般小于5mm;构造蚀变岩型主要由强裂蚀变的碎裂岩、超碎裂岩组成,矿化连续且稳定(w(Au)1 5×10-6～8×10-6),是该矿床的主要矿石类型.赋矿地层具明显的热水沉积特征,成矿物质主要来自地壳深部,为一沉积变质-热液叠加改造型金矿.     

宁夏海原县马场沟金矿地质特征及其矿床成因

对宁夏海原县马场沟金矿地质特征及其矿床成因进行了研究.结果发现,马场沟金矿赋存西华山弧形推覆构造带上,成矿地层为中元古界蓟县系海原群地层;金矿体、矿化体主要集中分布在呈北西西向搌布的含矿构造带上,含矿总体长度达3.5km,并且显示西部收敛、东部撒开的帚状排列型式.矿区内已发现的14个金矿体、矿化体主要有煌斑岩型、石英脉型、蚀变岩型3种矿石类型,以煌斑岩型为主,石英脉型为次,蚀变岩型少量.矿床成因与区域变质、区域构造、岩浆活动关系密切,矿床成因类型属变质-热液型金矿床.     

广西金牙金矿毒砂 Re-O s同位素测年和硫同位素示踪

金牙金矿的载金矿物主要为毒砂,次为含砷黄铁矿。毒砂矿物结构均一,为主成矿阶段热液成因,相较于成因复杂的环带状含砷黄铁矿更适合于同位素测年和示踪。通过对该矿床毒砂的单矿物Re-Os同位素测年和S同位素分析,获得Re-Os等时线年龄为（206±22）Ma,反映金矿形成于晚三叠世末期,大致相当于印支期挤压造山向燕山期拉伸的构造转换期。毒砂δ34 S值为-9‰～-3.9‰,平均值为-5.3‰,具有沉积硫的特征,推断硫来自地层,成矿流体为盆地建造水。由此认为金牙金矿是一个与盆地流体和沉积物有关的后生热液矿床。     

Petrological characteristics,geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province,China

The alkali-rich rocks,spreading along the suture zone of Jingsha River,refer to the alkali-rich porphyry rocks,which emplace during the Himalaya epoch in northwest of Yunnan Province,and consist of syenit,syenit porphyry,monzonite porphyry and granite porphyry.Petrological chemical analysis results suggest that silica is poor and aluminum is rich,and high potassium large ion lithophile elements(LILE),light rare earth element(LREE) and Sr are obviously detracted in these rocks.High field strength elements(HF...     

陕西双王金矿床地质特征及找矿标志

双王金矿床属大型低品位角砾岩型金矿．矿床直接赋存层位是中泥盆统古道岭组，矿体隐伏或侧伏于含铁白云石胶结角砾岩带中；热液活动可划分5个期次，其中Ⅱ1黄铁矿钠长石亚阶段和Ⅲ2黄铁矿亚阶段为主要成矿阶段，主要载金矿物为黄铁矿．赋存于中泥盆统古道岭组黄铁矿含铁白云石角砾岩是最明显最直接的找矿标志；而更广泛的钠长石化指示角砾岩带的存在；Ⅱ1和Ⅲ2的存在为金矿化较好地段；黄铁矿的包体爆裂个数在700个以上，显示为金矿化较好地段；黄铁矿的热电性特征在矿体中心以N型为主，矿体边部以P型为主；金的分散流异常、土壤地球化学异常、矿体空间分布的等距性都为找矿提供一定的标志．     

河北夏杖子金矿床的同位素地质研究

采用质谱分析等方法,测试了夏枚子金矿床石英流体包裹体和金属硫化物的同位素组成,获得石英流体包裹体Rb-Sr等时线年龄为105.4±7.2Ma;锶同位素初始比值为0.7126±0.0001;氢同位素组成δD‰为-91.7～-73.1;氧同位素组成δ~(18)OH_2O‰为5.68～6.23;金属硫化物的硫同位素组成δ~(34)S‰=-23.38～-14.52;铅同位素组成~(206)Pb/~(204)Pb=16.441～16.615,~(207)Pb/~(204)Pb=15.228～15.256,~(208)Pb/~(204)Pb=36.268～36.356。矿床成矿作用发生于燕山晚期,成矿热液主要为岩浆热液,金矿成矿物质来源于硅铝壳中下部太古代结晶基底,矿床成因是与燕山期岩浆热液有关的中—低温热液脉状金矿床。     

陕西双王金矿床的原生叠加晕模式

双王金矿具有多期多阶段叠加成矿成晕的特点,该矿床可分为４个阶段,不同成矿阶段的元素组合是：Ⅰ（阶段）－－Ａｕ,Ａｓ,Ｓｂ,Ｍｎ,Ｎｉ;Ⅱ－－Ａｕ,Ａｇ,Ａｓ,Ｓｂ,Ｂｉ,Ｍｏ,Ｍｎ,Ｎｉ;Ⅲ－－Ａｕ,Ａｓ,Ｓｂ,Ｈｇ,Ｍｎ,Ｎｉ;Ⅳ－－Ａｕ,Ａｇ,Ａｓ,Ｓｂ,Ｈｇ,Ｂ,Ｂｉ,Ｍｏ,Ｍｎ,Ｎｉ,其中Ⅰ、Ⅱ、Ⅲ阶段为主成矿阶段。单阶段形成的矿体（晕）的生趣分带序列是（从上→下）：Ｈｇ,Ｂ,Ｓｂ,Ａｓ→     

Metallogenic characteristics and ore-prospecting future of pre-cambrian gold deposits in Mufu-Jiuling district

Mufu-Jiuling district is an important placer gold producing land since the ancient time. In recent years, some primary gold deposits and mineralizations, e. g., Huangjindong and Tulongshan gold deposits, have been found. But the metallogenic conditions and regularities as well as the ore-prospecting future remain to be recognized. Through the study on the metallogenic background and condition, the auriferous source bed and the mineralizing characteristics, three types of primary gold deposits are confirmed to be prospective in this district and some key problems about their prospecting and evaluating are put forward. Synopsis of the author Wu Yanzhi, professor, born in 1931. Research fields include: prospecting and metallogeny of ore deposits.     

地电化学法在广西横县泰富金矿的应用效果

在广西横县泰富金矿进行了地电化学测量,对以前的地电化学测量方法技术进行了改进,在已知金矿体上方有较好的Au地电化学异常出现,认为改进后的地电化学方法在该区是可行性和有效的.运用该方法在工作区圈出5个异常带,经过边采边探,在Ⅳ号异常带的Ⅳ-1和Ⅳ-2异常见到了金矿体,Ⅱ号异常带的Ⅱ—1异常经钻孔验证见到金矿化,Ⅲ—2异常内有民采坑,Ⅴ号异常带经槽探揭露发现金矿化体,平均品位2 063×10-6,认为该方法地质找矿效果较好.     

嵩县东湾金矿床原生晕垂直分带特征及其意义

嵩县东湾金矿床赋存于中元古宇熊耳群鸡蛋坪组火山岩中,属岩浆热液蚀变岩型金矿床．矿区在原生晕研究方面存在一定空白,矿床受区域性大断裂控制,主矿体在垂向上的原生晕分带明显．通过对控矿断裂F．的地表、浅部坑道及深部钻孔中金矿脉及其围岩原生晕采样工作,及样品中Au,Ag,Cu,Pb,zn,Co,Ni,Ba8种元素的化学分析,得出Ba是金矿体的前缘指示元素,在矿体前缘和上部富集形成异常;Au,Ag,cu,Pb,zn是金矿体的近矿指示元素,在矿体上、中、下部富集形成异常;Co,Ni是矿体尾部指示元素,在矿体的下部富集形成异常．计算出矿体的垂直正向分带序列为Ba-Pb．Zn-Au．Ag．Co．cu-Ni．推断该矿体的地表出露部分为矿体的中上部,深部有较大的找矿潜力．     

大坪超大型金矿床铅和硫同位素组成特征及其地质意义

云南大坪超大型金矿床是哀牢山金矿带内最具代表性的金矿床之一,矿体赋存于海西期桃家寨闪长岩体内,矿石类型以石英脉型为主,与金伴生的是以黄铁矿、方铅矿为主的各种硫化物。本文对该矿床主成矿阶段石英脉型矿石中方铅矿的铅、硫同位素地球化学特征开展了系统研究,结果表明：大坪金矿床主成矿阶段铅同位素具有较窄的206Pb/204Pb值和相对较高的207Pb/204Pb值及208Pb/204Pb值,但变化范围不大,分布于正常铅范围。通过计算获得相关特征参数,利用铅构造模式图及相关图解综合分析,表明矿石铅为壳幔混合铅;硫同位素组成变化范围为-4.9‰-9.2‰,平均值为3.12‰,偏离陨石硫的范围,而与基性岩类的硫同位素组成非常接近,表明硫主要来源于深部,反映了地幔硫遭受地壳物质混入后的硫同位素组成。该矿床的成矿物质为深部幔源物质混合了壳源物质。     

山东胶东地区盘子涧金矿成矿流体He-Ar同位素地球化学特征

盘子涧金矿地处山东胶东地区蓬莱—栖霞金成矿带南部,是典型的石英脉型金矿,Au品位高,目前对该矿床成矿流体来源的研究尚不深入。在详细的矿相学观察及黄铁矿显微结构研究基础上,对盘子涧金矿主成矿阶段(石英-黄铁矿(绢云母)阶段和金-石英-多金属硫化物阶段)的载金黄铁矿进行了流体包裹体He-Ar同位素组成分析。结果表明:盘子涧金矿载金黄铁矿中流体包裹体的³He丰度为(3.49～8.50)×10^-14 cm³ STP·g^-1,⁴He丰度为(2.46～5.06)×10^-8 cm³ STP·g^-1,³He/⁴He值为0.8R_a～1.2R_a(R_a为大气³He/⁴He值,R_a=1.39×10^-6),成矿流体表现出以富集地幔为主导的壳幔混合特征; ⁴⁰Ar丰度为(1.02～2.65)×10^-7 cm³ STP·g^-1,⁴⁰Ar/³⁶Ar值为896.3～1 724.1,是大气饱和水⁴⁰Ar/³⁶Ar值的2～3倍,与中国东北部幔源岩样品⁴⁰Ar/³⁶Ar值相近,推测成矿流体主要来源于富集地幔,成矿流体中存在着一定量的地壳放射性成因⁴⁰Ar,表明地壳流体参与了成矿作用。综上所述,推断山东胶东地区盘子涧金矿成矿流体为以富集地幔流体为主导的壳幔混合流体。     

Formation mechanism of breccia pipe type in Yixingzhai gold deposit

Based on the basic geological features of Yixingzhai gold deposit, the geological features, classification and relation to mineralization of breccia pipes were discussed by surveying the xenoliths and breccia＇s mineral composition, structure and construction, typical mineralization alteration phenomenon on field and microscopic anatomy in breccia pipes. And the ore-controlling mechanism and the formation mechanism of the blasting breccia pipes were investigated. The main conclusion shows that Hewan and Nanmenshan breccia pipes nearby the NW-striking deep fault are shaped earlier, belonging to the acidic siliceous ingredient production of ultra-hypabyssal magmatic in the late magma stage; Tietangdong and Nanmenshan breccia pipes that are shaped latter are the ultra-hypabyssal auriferous fluid production composed mainly of the skarn in the hydrothermal stage after the magma period. Both root in the unified deep magmatic chamber, belonging to differentiation derivatives at different stages in the deep magmatic chamber.     

Characteristics of Ore-Forming Fluids of Gold Deposits in Daqingshan District, Inner Mongolia, China

Locatedinthemid-westoflimerMongolia.Daqingshandistricthasmanygolddepositsoccurringalongaeast-weststrikingductileshearzonewithinagreelt,whichismainlycomposedoftheArcheanWulashangroup.Thehydrothermalmineralizationcanbedividedintofourstages:(1)pyrite-quartz,(2)quartz-Pyrite,(3)polymetallicsulfidesand(4)carbonates-quartz.Themajormetalylicmineralsintheoreofgold-bearingveinsarenativegold,electrum,pyrite,chalcopyriteandgalena,buttheganguemineralsaremainlyquartz,secondarilysericite,ankeriteandexcite.Prinipalalterationpatternsinthegolddepositsaresericithation,silicification,pyritizationcarbonatizationandchlorization.Aninvestigationonfluindinclusionsshowsthattheore-formingfluidswerelowinsalinitieandhighinCO2content,MeasuredδDoffluidinclusionsinquartzfromtheoreveinsrangesfrom-65‰to-104‰,butδ18Oquartzfrom10.0‰to12.8‰.Thesedatashowthatthewaterinhydrothermalfluidprecipitatingtheorebodiescouldhavebeenmainlymagmaticwaterandmetamorphicwaterbutlocalmeteoricwatermighttakepartinthelatemineralization.δ13Cfromfl     

新疆萨吾尔山阔尔真阔腊金矿区的深部找铜研究

阔尔真阔腊地区位于新疆准噶尔西北缘萨吾尔山东部,为晚古生代岛弧构造环境,中性,中酸性火山一次火山岩浆活动频繁而强烈,火山角砾岩,隐爆角砾岩及火山机构十分发育,对次火山岩型铜（钴）成矿有利,阔尔真阔膜金矿与福建紫金山,台湾金瓜石铜金矿均属于酸性硫酸盐型浅成低温热液矿床,矿化蚀变特征极为相似,研究表明阔尔真阔腊金矿深部具有形成铜矿体的地质条件和找矿前景。     

五台山-恒山一带金、银多金属矿床同位素地球化学及其成矿模型

通过同位素地球化学研究，五台山—恒山—带金、银多金属矿床的硫源均来自深源；铅同位素组成表明成矿物质主要来自下地壳及地幔，但绿岩型金矿铅同位素变化较大，而燕山期次火山岩型金、银多金属矿床铅同位素较为集中；运移形成矿物的水源也有所不同，前者是以变质水为主(δ^18OH2O1.34％-12.55％,δD-22.287％—--177.36％)，后者则是以岩浆水及天水混合为主(δ^18OH2O多在-18．6‰～ 10．05‰，δD-68‰～-110‰)；碳氧同位素组成也揭示了前者以变质作用为主(δ^13C(PDB)-1.25‰～1.37‰，δ^18O(SMOW)11．4％～16．5％)，后者与花岗斑岩侵入有关(δ^13C(PDB)为-4．0‰～-9．2‰，δ^18O(SMOW)3．5‰～9．6‰)；两类矿床的锶同位素比值，也反映了与成矿作用有着密切关系的太古宙斜长角闪岩和燕山中期花岗斑岩均是壳幔混合产物，故可视为两类矿床有着内在成因联系；钐-钕同位素组成不仅获得相同结论，而且从εNd(0)和∫sm／Nd均是负值，推测属大陆地壳岩石，可能为O-C型绿岩地体的成矿背景，从而建立了五台热幔柱构造的成矿模型，试图指导找矿。