陕西略阳铧厂沟金矿床地质与矿床类型

铧厂沟金矿床位于勉略缝合带中泥盆系三河口群郭镇岩组中。含矿与容矿岩系为泥盆系三河口群郭镇岩组中的细碧岩和结晶灰岩。主控矿构造为寨子湾韧-脆性剪切构造带。围岩蚀变包括退化蚀变和矿化蚀变。在矿区内产出南北两条矿化带，矿石类型为蚀变细碧岩型、黄铁绢英片岩型和石英脉型。主要的金属矿物为黄铁矿和黄铜矿，金矿物是自然金。韧脆性剪切构造叠加和岩石强烈变形、彻底退化蚀变以及后期含矿热液交代与充填是主要的成矿作用，属于火山-沉积岩系中的类卡林型金矿床。     

新疆布尔根韧脆性剪切带金矿地质特征

布尔根金矿带产于上泥盆统卡希翁组中基性火山岩中．金矿带严格地受韧性剪切带控制，赋矿岩石是韧脆性变形的破碎蚀变岩，主要是糜棱岩和石英细脉和网脉，围岩蚀变有硅化、黄铁绢英岩化、黄铁矿化、绿泥石化和高岭土化等．该金矿具韧性剪切破碎蚀变型金矿的特征．     

胶东大庄子金矿地质特征与成因探讨

大庄子金矿是我国首次发现赋存于胶东变质岩中大规模韧-脆性剪切带内的蚀变岩型及石英脉型金矿床.金矿化与绢英岩化、黄铁矿化、硅化和碎裂岩化有关.矿体受韧-脆性剪切带、黄铁绢英岩化、晚元古代晚期角闪岩相变质岩的共同控制.矿石矿物组合以自然金-金属硫化物-架状硅酸盐为主的组合类型.矿床属于在韧-脆性剪切作用下,与含金量较高的下元古界荆山群变质岩的形成、演化有成因联系的蚀变、重熔、交代中温动力热液改造型金矿床.     

胶东大庄子金矿地质特征与成因探讨

大庄子金矿是我国首次发现赋存于胶东变质岩中大规模韧－脆性剪切带内的蚀变岩型及石英脉型金矿床。金矿化与绢英岩化、黄铁矿化、硅化和碎裂岩化有关。矿体受韧－脆性剪切带、黄铁绢英岩化、晚元古代晚期角闪岩相变质岩的共同控制。矿石矿物组合以自然金－金属硫化物－架状硅酸盐为主的组合类型。矿床属于在韧－脆性剪切作用下,与含金量较高的下元古界荆山群变质岩的形成、演化有成因联系的蚀变、重熔、交代中温动力热液改造型金矿     

老挝琅勃拉邦帕奔矿区原生金矿床的地质特征及找矿方向

老挝帕奔金矿区位于区域性奠边府—琅勃拉邦断裂带的旁侧,受NE-NNE向韧脆性剪切带的控制,在下二叠系灰岩中产有构造破碎蚀变岩型金矿和含金方解石型脉金矿,全区分为6个矿化带,总体呈NNE向展布。金的富集受脆韧性断裂多次叠加或不同方向断裂交汇点的控制,矿化围岩中出现碳酸盐化、铁白云石化、菱铁矿化、大理岩化、高岭土化等热液蚀变。研究认为,区域上的韧脆性剪切带的延长部位应列为找矿区段,在灰岩和砂岩的接触地带(如M6矿化带西侧)应注意找矿,各矿化带内强片理化带的边部和构造的叠加、交汇部位是勘查工作的重点。     

构造形变类型与金矿化类型的关系

含金构造形变类型决定或控制金矿化类型,深层次的韧性超韧性变莆为元素迁出区,一般不利于金矿化;韧性含金构造控制蚀变糜棱岩型金矿化,韧脆性变形含金构造控制构造蚀变岩型金矿化,脆性含金构造控制石英脉型金矿化。对于韧性剪切带和未来发生叠加蚀变矿化的糜棱岩来说,往往是构造变形越强,金元素含量越低。但在蚀变糜棱岩型金矿床中,已经叠加蚀变矿化的糜棱岩若幅度,石英变形机制与金矿富集程度都有密切的关系,而且含金构造     

河北省尖宝山金矿床成矿特征及控矿条件

尖宝山金矿床受冀东幔枝构造的北缘拆离带和喜峰口－凌源NE向断裂带的控制，矿区形成3个较大规模的金矿化带。研究认为拉马沟组变质岩石基底富矿源岩（层），元古界长城系中的金元素亦参与了成矿。北矿化带形成于韧脆性构造环境，而南矿化带则始于韧脆性环境，终于脆性环境。矿床成因为在拆离带型金矿化上叠加了构造蚀变岩型金矿化。     

胶东焦家断裂蚀变岩带韧-脆性变形定量化研究

焦家断裂带位于胶东西北部,产出焦家、新城、寺庄等超大型、大型"焦家式"金矿,与脆韧性变形构造有关。但是关于韧脆性变形的研究尚需要加强,缺乏脆性韧性断裂定量化的测量与研究。文中用穿过焦家断裂蚀变带的1 800多m的钻孔岩心为对象,对焦家断裂下盘蚀变花岗岩区开展观测分析。经过岩石学矿物学定量化研究确定蚀变分带为,黄铁绢英岩质碎裂岩带、强钾长石化花岗质蚀变岩带、弱钾长石化花岗岩带和未蚀变黑云母二长花岗岩带。其相应特征是:黄铁绢英岩带宽35.7m,岩石变形总量和韧/脆性变形比率依次为75%~85%和0.07,以脆性变形为主,矿化蚀变作用强烈;强钾化花岗质蚀变岩带宽10.6m,其变形总量和韧/脆性变形比例为75%~80%,0.78,以韧脆性变形为主,矿化蚀变作用变弱;弱钾长石化花岗岩带宽76.92m,其变形量和韧/脆性变形比为45%~55%,1.75,以韧性变形为主,几乎不发生矿化。总体来说,主裂面以脆性变形为主,远离主裂面韧性变形为主,矿化主要产于脆性与韧脆性变形转换带,即黄铁绢英岩碎裂岩与强钾化蚀变岩过渡带。     

雪峰金矿田矿床特征及找矿前景

雪峰金矿田位于雪峰弧形金锑成矿带中段,被两大断裂、三大岩体所夹持,具有地层-构造岩浆岩三位一体的极好成矿条件。向韧脆性剪切带和向张剪性破碎蚀变带共同控制了-NENW矿床、矿体的产出。矿床类型为韧脆性剪切带型,可分为破碎蚀变岩型、砂岩层控细脉浸染型、片理化蚀变岩型、石英脉型个亚类。面上和深部找矿潜力巨大,预测该区金资源量在4n×102 以上,t 进一步加强该区地质调查工作,有望实现湖南金矿找矿的重大突破。     

陕西凤县八卦庙金矿脆韧性剪切带控矿特征及成矿模式探讨

陕西凤县八卦庙金矿床是西秦岭已探明的超大型金矿床,矿床位于苏家沟-空棺沟复式向斜北翼之八卦庙次级倒转向斜北翼,主要赋矿岩性为星红铺组下段铁白云石粉砂质千枚夹条带状大理岩化灰岩。金矿体受北西向F13大断裂下盘的韧性剪带控制,形成石英脉型、构造蚀变岩型和蚀变糜棱岩型3种金矿化类型,而以构造蚀变岩型金矿化为主。韧性剪带剪切带从地表浅部向深部依次分为脆性区、脆-韧过渡区和韧性区,分别与石英脉型、构造蚀变岩型和蚀变糜棱岩型金矿化相对应。印支期,随着造山运动、地壳隆升,剪切带中深层次的韧性剪切变形的糜棱岩被抬升,依次与其上的脆-韧性及脆性剪切叠加,从而构成不同类型的金矿化叠加富集,形成金的贫矿体。印支—燕山期,随着岩浆作用活跃并开始沿北东向F22断裂上侵,驱使深部及两侧围岩中金离子活化,分别向F22断裂西侧的F21和东侧F23断裂迁移、聚集,对韧性剪切带形成的贫矿体叠加改造富集,最终就位构成金矿体。     

亦论韧性剪切变形与金的成矿作用——与邵世才《试论韧性剪切变形与金的成矿》一文的讨论

剪切带型金矿是一种重要的金矿类型.韧性-超韧性深层次剪切变形是促使Au元素活化分异、形成动力变质含金热液的过程,中浅层次的韧脆性、脆性剪切变形区是Au元素聚集成矿部位.韧脆性剪切带的不同变形层次及其构造岩类型决定了剪切带型金矿床的矿化类型.剪切带型金矿床往往具有成矿时代滞后、空间规模差异、物源指示差异、韧性变形强度与Au元素含量反相关等异常特征.长期演化的造山带附近及边缘是寻找大型剪切带型金矿床的有利地区.     

韧性剪切带及其控矿作用——以新疆康古尔金矿为例

康古尔金矿具有独特的成矿地质特征,矿床位于石炭系火山岩区大型韧性剪切带的次级构造中.控矿构造表现为脆韧性剪切活动的特点,该脆韧性剪切带在成矿期的活动具有中低温、高应变速率、高差异应力的动力学特征.金矿床的分布受脆韧性剪切带控制,矿体由蚀变千糜岩和糜棱岩化火山岩中矿化富集地段组成,矿体产状平行于糜棱岩面理.矿化产于脆韧性变形强烈部位,脆性变形叠加有利于形成富金矿.     

内蒙古兵图—大泉子金矿区韧性剪切带磁组构特征及其与金矿的关系

变形岩石的磁组构参数（K1,K2,K3,P,T,F,L,E等）可以用来定量地分析和了解构造变形的性状。内蒙古兵图—大泉子一带韧性剪切带发育,并伴有金矿的产出。文章通过定向采取韧性剪切带内的岩石样品,测定岩石磁组构特征,认为该断裂面两侧形成一对顺时针方向力偶,促使兵图—大泉子一带的韧性剪切带呈右行走滑运动。韧性剪切带由于剪切生热和上地幔物质的上涌,在中下地壳发生高温高压变质作用,将热烘烤作用中形成的富含CO2等偏碱性流体带入中上地壳,在剪切带的脆性构造中因温压下降和沸腾作用,使金矿物与多金属硫化物沿糜棱面理及显微裂隙分布,形成韧性剪切带型金矿。     

吉林省夹皮沟金矿地质特征及成因探讨

夹皮沟金矿产于晚太古宙绿岩带的下部层位。北西向的韧性剪切带控制着金矿田和矿床分布,而矿体主要受叠加于韧性剪切带之上的脆性断裂构造制约。金主要来源于围岩。华力西晚期—燕山早期为主要成矿期。属多源、多期的叠生型金矿床。     

湖南苗儿山韧性剪切带与金矿化

湖南雪峰弧形构造带中的苗儿山韧性剪切带存在糜棱岩和片理化岩石两大构造岩类,各具不同的变形特征,根据金矿的产出规律,认为该地区金矿化受韧性剪切带,老地层,后期脆性断裂等多重因素控制,发育于老地层中的片理化带提供了成矿流体的运移通道和容矿空间,加强片理化带的研究对于在雪峰弧形构造带上找金具有重要意义。     

大平沟金矿床矿石特征与金的赋存状态

大平沟金矿床是受韧性剪切带控制的中温动力变质热液矿床，金矿石主要为蚀变糜棱岩型，夹少量钾长石石英脉型，矿石结构有变晶结构、交代－充填结晶结构两主要类型，矿石构造以块状构造、团块状构造、细脉状构造和浸染状构造为主。金呈独立金矿物（主要为自然金）出现，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、钾长石及方解石等主要载金矿和中，金矿物形态多样，粒度以中细粒为主。上述特点与我国东部地区产于太古变质岩（绿岩带）中的金矿床具有可对比性，也与矿床成因研究的认识相吻合。     

韧性剪切带型金矿成矿模式

剪切带型金矿是一种重要的金矿床类型,深层次韧性剪切变形是金元素活化迁移过程之一,导致含金动力变质热液形成,中浅层次的韧脆性剪变形区是金元素聚集成矿部位;韧性剪切带的不同变形层次及其人断层岩类型制约着金矿化类型,剪切带型金矿床具有成矿滞后,空间规模差异,物源指示差异,韧性变形强度与金元素含量呈反相关等特征,长期演化的韧性剪切带是剪切带金矿床形成并导致多种金矿化类型叠加,形成大型金矿床的有利条件,也是     

Orogenic Gold Mineralization in the Qolqoleh Deposit, Northwestern Iran

The Qolqoleh gold deposit is located in the northwestern part of the Sanandai‐Sirjan Zone, northwest of Iran. Gold mineralization in the Qolqoleh deposit is almost entirely confined to a series of steeply dipping ductile–brittle shear zones generated during Late Cretaceous–Tertiary continental collision between the Afro‐Arabian and the Iranian microcontinent. The host rocks are Mesozoic volcano‐sedimentary sequences consisting of felsic to mafic metavolcanics, which are metamorphosed to greenschist facies, sericite and chlorite schists. The gold orebodies were found within strong ductile deformation to late brittle deformation. Ore‐controlling structure is NE–SW‐trending oblique thrust with vergence toward south ductile–brittle shear zone. The highly strained host rocks show a combination of mylonitic and cataclastic microstructures, including crystal–plastic deformation and grain size reduction by recrystalization of quartz and mica. The gold orebodies are composed of Au‐bearing highly deformed and altered mylonitic host rocks and cross‐cutting Au‐ and sulfide‐bearing quartz veins. Approximately half of the mineralization is in the form of dissemination in the mylonite and the remainder was clearly emplaced as a result of brittle deformation in quartz–sulfide microfractures, microveins and veins. Only low volumes of gold concentration was introduced during ductile deformation, whereas, during the evident brittle deformation phase, competence contrasts allowed fracturing to focus on the quartz–sericite domain boundaries of the mylonitic foliation, thus permitting the introduction of auriferous fluid to create disseminated and cross‐cutting Au‐quartz veins. According to mineral assemblages and alteration intensity, hydrothermal alteration could be divided into three zones: silicification and sulfidation zone (major ore body); sericite and carbonate alteration zone; and sericite–chlorite alteration zone that may be taken to imply wall‐rock interaction with near neutral fluids (pH 5–6). Silicified and sulfide alteration zone is observed in the inner parts of alteration zones. High gold grades belong to silicified highly deformed mylonitic and ultramylonitic domains and silicified sulfide‐bearing microveins. Based on paragenetic relationships, three main stages of mineralization are recognized in the Qolqoleh gold deposit. Stage I encompasses deposition of large volumes of milky quartz and pyrite. Stage II includes gray and buck quartz, pyrite and minor calcite, sphalerite, subordinate chalcopyrite and gold ores. Stage III consists of comb quartz and calcite, magnetite, sphalerite, chalcopyrite, arsenopyrite, pyrrhotite and gold ores. Studies on regional geology, ore geology and ore‐forming stages have proved that the Qolqoleh deposit was formed in the compression–extension stage during the Late Cretaceous–Tertiary continental collision in a ductile–brittle shear zone, and is characterized by orogenic gold deposits.     

铧厂沟金矿床地质特征及控矿冈素分析

铧厂沟金矿床位于勉－略－宁三角地带成矿有利部位。矿区出露中下泥盆统三河口群和中上元古界碧口群。矿床内发育的韧性剪切带经历了右行（韧性）－左行（韧脆性）－右行（脆性）多期（次）活动矿化受透镜状细碧岩控制,分布于韧性剪切带之中。矿体蚀变强烈,新生矿物定向排列,脉体中矿物具亚颗粒、变形纹、变形条带等料内变形特征。同位素地球化学及稀土分析结果表明,基性火山岩是金的矿源层。金矿的形成富集与韧性剪切带多期（次     

Geochemistry of main types of gold deposits in shear zones, China

Shear zone-hosted gold deposits in China can be divided into four types:ductile,brittle-ductile,ductile-brittle and brittle,of which the ductile and brittle types are the basic ones.All these types of gold deposits have their own geochemical characteristics.The Hetai gold deposit in Guangdong Province,for example,is a mylonite-type gold deposit in a ductile shear zone.With increasing mylonitization,obvious changes took place in trace elements in minerals and rocks,enriching gold and mineralizing elements.The S and Pb isotope data indicated that the ore-forming materials were derived from the strata.Hydrogen and oxygen isotopic and fluid inclusion studies also implied that the ore-forming fluid was much closer to meteoric water from the early to the late ore-forming stage.The Linglong gold deposit,Shangdong Province,is a quartz-type gold deposit in a brittle shear zone.Changes in rocks,minerals and trace elements occurred in the process of f ormation of gold quartz veins,and the analytical results of S,Pb ,Hand O isotopes showed that ore deposition is connected not only with the Jiaodong Group,but also with anatexic granites.