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1.
秦岭卡林型金矿床及相关问题探讨   总被引:40,自引:4,他引:36  
张复新  宗静婷  马秦 《矿床地质》1998,17(2):172-184
鉴于目前对沉积岩型金矿、卡林型金矿概念和类型划分存在分岐,该文在对秦岭沉积岩区浸染状金矿研究基础上,主张将沉积岩为容矿岩石的金矿床划分为广义和狭义两类:沉积岩型金矿床是具有广义内涵的一类金矿,包容了从沉积-轻微改造,到沉积-强烈改造的一类热液金矿;可划分四种亚类:卡林型、变质细碎屑岩型、热水沉积岩型、脉状体型。卡林型金矿床是狭义内涵的金矿类型,属于沉积岩型金矿类型中的重要亚类;在区域金成矿密集区内,可构成卡林型矿床地球化学系列。建议不要将沉积岩型金矿和卡林型金矿相互代替使用或等同起来。秦岭沉积岩区卡林型金矿与美国卡林典型矿床有较好的类比性。矿床具有沉积-轻微改造的中—低温热液成因特征。  相似文献   

2.
湖北蛇屋山卡林型金矿地质及成因   总被引:1,自引:0,他引:1  
蛇屋山金矿产于以寒武-奥陶系碳酸盐岩为主体的倒转背斜及双重逆冲构造中;矿床属低温热液成因;浅部矿体,即缓倾斜断层构造岩中的原生金矿,经历了第三纪以来近亿年的风化淋滤改造,成为可露采、易堆浸的风化金矿床;矿石品位低,金呈微细粒浸染状。与美国卡林型金矿类比,该矿属卡林型金矿。蛇屋山卡林型金矿分为原生金矿和风化金矿两个亚类。  相似文献   

3.
西秦岭地区造山型与卡林型金矿床   总被引:33,自引:0,他引:33  
西秦岭金矿床分为卡林型和造山型两类。卡林型金矿床麇集于南秦岭和松潘—甘孜造山带的东北部。三叠纪和早侏罗世的同构造花岗闪长岩广泛分布于西秦岭中部和南部、松潘—甘孜盆地以及扬子克拉通边缘。造山型脉状金矿床主要分布于西秦岭造山带中的脆韧性剪切带内。大部分粗粒金主要赋存在网格状石英细脉和角砾状围岩中的黄铁矿、磁黄铁矿、毒砂和少量贱金属硫化物中和以分散状分布在蚀变围岩中。同位素资料表明晚三叠世 -中侏罗世与扬子克拉通俯冲有关的作用控制了造山型金矿床的形成。  相似文献   

4.
金龙山-丘岭卡林型金矿床成矿特征   总被引:9,自引:1,他引:8  
金龙山—丘岭卡林型金矿床产于华北与扬子两地块会聚结合带的扩张海盆复杂岩相古地理沉积环境中。通过海底火山热液作用和生物活动的沉积成矿作用,形成成矿元素初始富集的矿源层。经后期叠加改造地质作用形成工业矿体  相似文献   

5.
卡林型金矿床主要产于狭义扬子地块周边的古生代、中生代坳陷区内,即稳定地块与活动地块之间的构造过渡带。明显受构造控制,具有分级控制特点,区域性深大断裂控制着金矿带的分带,旁侧次级断裂,短轴背斜或穹隆控制着矿床,更低序次断裂控制着矿体的定位。  相似文献   

6.
卡林型金矿床控矿构造特征的研究   总被引:1,自引:0,他引:1  
卡林型金矿床主要产于狭义扬子地块周边的古生代、中生代坳陷区内,即稳定地块与活动地块之间的构造过渡带。明显受构造控制,具有分级控制特点,区域性深大断裂控制着金矿带的分带,旁侧次级断裂,短轴背料或穹隆控制着矿床,更低序次断裂控制着矿体的定位。  相似文献   

7.
秦岭造山带是世界第二大卡林-类卡林型金矿省,其地质背景与美国西部卡林-类卡林型金矿省明显不同,位于大陆内部的碰撞造山带,而非活动大陆边缘的盆岭省。秦岭卡林-类卡林型金矿主要赋存于板块缝合带及其前陆冲断带的海西-印支构造层中,以泥盆系和三叠系为主,主要岩性为瀉湖-浅海相的含碳细碎屑岩-碳酸盐岩建造,即碳硅泥岩系;成矿元素为Au-As-Sb-Hg-Ag,缺乏T1,共生矿种为Sb,Hg,Ag,U和重晶石等;成矿温度为160~300℃,流体盐度为4%~10%(NaClcq),压力为5~50MPa,深度约0.5~5km,属于中低温中浅成热液矿床,与内华达卡林-类卡林型金矿一致。成矿流体具有建造水特点,C2H6含量较高,显示了有机流体参与成矿。成矿同位素年龄介于220~100Ma之间,以170Ma为高峰,地球动力学背景属碰撞造山过程挤压-伸展转变期的减压增温体制,成矿构造模式为碰撞造山成岩成矿和流体作用模式。陆陆碰撞过程中,沿龙门山、阿坝-黑水-平青、若尔盖-文县、玛曲-勉县-略阳、白龙江、双河-公馆、凤县-镇安、安康等大型断裂带的陆内俯冲作用不仅导致了西秦岭地壳缩短增厚隆升,而且使俯冲板片变质脱水、熔融,派生成矿流体和相关熔体,流体和熔体的上升到仰冲板片次级构造带,形成了卡林-类卡林型和造山型金矿成矿系统。据此提出,西秦岭深部可能存在潜力巨大的造山型金矿省。  相似文献   

8.
卡林型金矿床的特征和成因   总被引:10,自引:0,他引:10  
卡林型金矿床主要分布在北美大盆地地区科迪勒拉造山带、科罗拉多地台和我国扬子地块西南缘的板内古生代-中生代沉降带和西北缘古生代-中生代冒地槽。具有分布局限、成矿集中的特点,形成许多超大型矿床。金矿床成矿域发育一套大面积分布的巨厚的古-中生代冒地槽建造,同成矿期的岩浆活动和构造活动强烈,有利于形成各种地热体系和流体活动。金矿床往往形成成矿带,单个金矿床的规模大小不一,矿化受构造、围岩和深部流体控制,围岩一般具有还原性质。围岩蚀变为去碳酸盐化、硅化、泥化、硫化物化和重晶石化等。金与砷黄铁矿、黄铁矿及毒砂紧密相关,以次显微金的形式存在。其他矿物为雄黄、雌黄、重晶石、辉锑矿、石英、方解石、含铊矿物以及表生矿物明矾石和黄钾铁矾等。成矿流体中水为大气降水,碳、硫主要来源于矿床围岩和以下岩石,少量可能来源于深部。矿床形成于浅-中等深度。提出了大气降水热液、岩浆热液、变质热液和卤水成矿等卡林型金矿床形成模式,大气降水成因模式能较好解释金矿床的地质地球化学特征。  相似文献   

9.
中国卡林型金矿的分布规律及找矿前景   总被引:3,自引:0,他引:3  
我国卡林型金矿床主要分布于扬子陆块西南缘的板内古生代-中生代沉降带和西北缘古生代-中生代造山带。具有分布局限、成矿集中的特点。金矿床往往形成成矿带,单个金矿床的规模大小不一,矿化受构造、围岩和深部流体控制。金矿床成矿域发育一套大面积分布的巨厚的古-中生代造山带建造,成矿期的岩浆活动和构造活动强烈。基于我国卡林型金矿的分布规律,找矿应优先考虑的有力部位有:1)地块边缘裂陷槽拉张与挤压交替的环境中沉积建造和不同性质大地构造接合部位或构造过渡带;2)在背斜构造倾伏端、背斜轴转折端、背斜翼部以及不同方向、不同序次的断裂破碎带交叉与复合部位;3)在富粘土质、粉砂质和有机质中发育的交叉断裂和可微渗透的纹层状细粒钙质和白云质粉砂岩,局部为较粗粒砂岩和透镜状砾状钙质生物碎屑岩夹层接触部位;4)在燕山期岩浆活动以及热点活动地区发育的古生界和中生界地层。  相似文献   

10.
蛇屋山金矿产于以寒武-奥陶系碳酸盐岩为主体的倒转背斜及双重逆冲构造中;矿床属低温热液成因(原生金矿);浅部矿体,即缓倾斜断层构造岩中的原生金矿,经历了第三纪以来近亿年的风化淋滤改造,成为可露采、易堆浸的风化金矿床;矿石品位低,金呈微细粒浸染状。与美国卡林型金矿类比,该矿属卡林型金矿。蛇屋山卡林型金矿分为原生金矿和风化金矿两个亚类。  相似文献   

11.
In this paper an intergrated geological and geochemical comparison is made of Carlintype and Carlin-like-type gold depostis in the region of South Qinling with their associated hydrothermal sedimentary lead-zinc pdposits,the Carlin-type deposits in the Yunnan-Guizhou-Guangxi gold triangle,China,the Carlin gold deposits,Carlin,western United States,and the Muruntau-type gold deposits in Uzbekistan.The comparative study indicates that the formation of these deposits has an intimate coupling relation with the mechanism of the tectonic movement of modern plates.Therefore,these deposits belong to those that were formed in the orogenic stage. They have the following similar characteristics:they are all sediment-hosted.occur in a tectonic environment of extensional rifting nature and show the characteristics of syngenetically modified mineralization.On the other hand,they alsso have noticeable differences:they are different in respect to their tectonic settings.association and structure of orogenic belts and complexity and strength of the modified mineralization.The regional tectonic evolution and extensive mineralization in orogenic belts are different expressions of the same continental dynamic process.  相似文献   

12.
<正>Red clay type gold deposits,located in the south of China,are situated not only in orogenic belts,but also in inner cratons,where climate is tropical-subtropical with clear arid and humid.The lateritic weathering crust often can be divided into five zones,including topsoil,siliceous duricrust zone,multi-color zone(or red clay zone in some deposits),pallid zone and saprolite zone from surface to the base rock,several of which are absent in some deposits.The base rocks are composed mainly of carbonate rocks with minor clastic rocks,intermediate-basic volcanic rocks and intermediate-acid and alkalic intrusions.The orebodies are mainly located in the multi-color zone with part of them in the pallid and saprolite zones.The ore sources include orebodies of Carlin-type gold deposits and porphyry gold deposits,as well as gold-rich base rocks.The red clay type gold deposits experienced early-stage endogenic gold mineralization and laterization during the Tertiary and Quaternary.The areas with endogenic gold deposits,especially Carlin-type gold deposits and porphyry gold deposits in karst depressions on the plateau,structual erosional platforms in the middle-lower mountains,and intermountain basins in southern China are well worth studying to trace red clay type gold deposits.  相似文献   

13.
Gold Headquarter of the CAPF has discovered the Yangshan super large-scale gold deposit in Gansu Province, which is a great breakthrough of gold exploration and prospecting in Western Qinling Mountains of China. The gold resources of this deposit achieved 308 tons with increasing potentials. Preliminary geological investigations indicate that the Yangshan gold deposit is located in the intra-continental collision orogenic belt; and the deposit was formed during the continent-continent collision orogenic processes. The geological characteristics of the deposit are similar to that of the typical Carlin-type gold deposits, while differences still exist. The ore-forming background is notably different from the Carlin gold deposit province in the United States; and the ore-forming fluids are similar with that of the orogenic-type gold deposit. Accordingly, the Yangshan gold deposit is a transitional type between the Carlin-type and the orogenic type gold deposits. At present, the Yangshan gold deposit is the largest Carlin and Carlin-like type gold deposit that is ever discovered in China. Researches on metallogeny, metallogenic model and ore-enrichment regularities of the Yangshan gold deposit are crucial to meet the pressing needs of the current geological investigation and ore exploration of the deposit.  相似文献   

14.
Gold Headquarter of the CAPF has discovered the Yangshan super large-scale gold depositin Gansu Province, which is a great breakthrough of gold exploration and prospecting in WesternQiniing Mountains of China. The gold resources of this deposit achieved 308 tons with increasingpotentials. Preliminary geological investigations indicate that the Yangshan gold deposit is located inthe intra-continental collision orogenic belt; and the deposit was formed during the continent-continentcollision orogenic processes. The geological characteristics of the deposit are similar to that of thetypical Carlin-type gold deposits, while differences still exist. The ore-forming background is notablydifferent from the Carlin gold deposit province in the United States; and the ore-forming fluids aresimilar with that of the orogenic-type gold deposit. Accordingly, the Yangshan gold deposit is atransitional type between the Carlin-type and the orogenic type gold deposits. At present, the Yangshangold deposit is the largest Carlin and Carlin-like type gold deposit that is ever discovered in China.Researches on metaliogeny, metaliogenic model and ore-enrichment regularities of the Yangshan golddeposit are crucial to meet the pressing needs of the current geological investigation and oreexploration of the deposit.  相似文献   

15.
南天山金矿带是世界上一个重要的金矿资源地,产出数个超大型金矿。这些矿床有许多共同点:如大地构造背景、构造环境、含矿岩系、容矿岩石、控矿构造、矿体形态、矿石类型、主要金属矿物、载金矿物、围岩蚀变、成矿时代和成矿方式等相似。但是,进一步分析可以发现他们之间也存在一定差异。例如,在构造位置、物质成分、围岩蚀变等方面存在差异。对本区一些基本的成矿特征进行分析后,认为矿带的形成与南天山造山带的形成和演化关系密切,华力西期与花岗岩活动有关的热液成矿作用应是主要的成矿作用。因此,该矿带应属于细脉浸染型金矿较为合适。南天山尚有寻找此类金矿的远景。  相似文献   

16.
基于金矿成矿地球动力学环境以及矿床基本地质特征等,将中国金矿床类型归纳为11 类,其中以构造破碎带蚀变岩型、中深成侵入岩体内及其外接触带型、卡林-似卡林型、浅变质碎屑岩中热液型、陆相火山岩型等为主要找矿类型;成矿年代以中生代、新生代为主。在中国Ⅲ级成矿区带划分基础上,总结研究大地构造单元、地质演化、成矿地质条件、空间分布特征、金矿类型、区域成矿要素、资源量等,初步厘定42 个金矿集区,其空间呈集中分布特征。根据金矿勘查单位面积的钻探数量,初步将中国金矿集区划分为高、中、低工作程度区,高程度区主要分布在中东部地区;除砂金矿外,中国88.12%的岩金(伴生金) 矿探矿深度在500 m 以上,说明探矿钻探验证偏少、偏浅。文章还探讨了中国金矿集区资源找矿潜力,提出了勘查找矿方向和建议,指出中东部老矿山深部、外围和西部金矿集区特别是位于新疆、青海、西藏等地区的,是未来找矿潜力重点区域,未查明资源储量巨大。  相似文献   

17.
黔西南卡林型金矿勘查中的构造地球化学研究   总被引:3,自引:0,他引:3  
罗孝桓 《贵州地质》2000,17(4):249-253
黔西南卡林型(微细浸染型)金的成矿作用在时间上与右江造山带区域地质构造热事件相扣合,金矿体形产状以及金富集程度和矿体规模在空间上受控矿构造几何学、运动学和动力学的制约。上述现象实质则是矿床成矿作用受构造地球化学行为的控制。  相似文献   

18.
TheeasternHebeiProvinceofChinaisoneofthemajorconcentratingareasofgoldmineralizationineasternChina,whichisanimportantpartofthe...  相似文献   

19.
许智迅 《地质与勘探》2012,48(2):305-312
[摘 要] 广西大瑶山加里东造山带发育的金矿床既具有造山带型矿床的特征,同时又与花岗斑岩 密切相关。位于大瑶山金矿带中部的湾岛矿田的大王顶金矿就是这类金矿床的典型代表之一。本文通 过调查大王顶金矿床的特征以及成矿花岗斑岩体中金的富集分布规律,剖析了加里东褶皱造山变形以 及花岗斑岩对金成矿的控制作用。由于大瑶山加里东造山带所处的特殊的构造环境,造山晚期所形成 的I 型花岗斑岩体在金的成矿中起着重要的作用,但金矿脉的容矿空间的形成却主要还是构造作用的 结果。  相似文献   

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