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1.
新疆昆仑式火山岩型块状硫化物铜矿床及成矿地质环境   总被引:7,自引:0,他引:7  
新疆西昆仑奥依塔克-恰尔隆拗陷带内阿克塔什-萨落依成矿带发现多处火山岩型块状硫化物铜矿床。这些矿床产在石炭系双峰式火山岩系之内,沿着下石炭统基性火山岩和上石炭统酸性火山岩两个层位产出,分别以玄武岩和流纹岩为容矿主岩,可以明显地分成基性火山岩型和酸性火山岩型两种类型。矿石主成矿元素均以铜为主,含少量的锌,几乎不含铅,矿床类型属于铜型。这些基性火山岩型和酸性火山岩型矿床被统称为昆仑式火山岩型块状硫化物铜矿床。根据矿床产出地质环境、双峰式火山岩系、沉积建造以及火山岩地球化学特征,推断昆仑式火山岩型块状硫化物铜矿床最可能形成于泥盆纪-石炭纪弧后拉张构造环境。  相似文献   

2.
可可塔勒矿床位于新疆阿尔泰造山带南缘,产于泥盆纪火山-沉积盆地内铅锌矿(可可塔勒)体呈似层状、透镜状,矿石构造以条纹条带状、块状、斑杂状为主,矿物成分相对简单,矿体直接容矿围岩为火山-沉积岩.矿床属火山-沉积岩容矿的块状硫化物矿床.为介于典型的火山岩容矿的块状硫化物型矿床(VHMS)和典型沉积岩容矿的硫化物矿床(SEDEX型)之间的过渡类型(一种新类型块状硫化物矿床),其矿化特征与伊比利亚型矿床相类似.  相似文献   

3.
含铜黄铁矿型矿床包括块状硫化物型铜矿床及别子型矿床。一般认为其形成与海底火山喷气-沉积作用有关。但对这类矿床的认识却存在很多争议。 1.对含铜黄铁矿型矿床的新认识。过去很多人都把这类矿床与块状硫化物矿床联系在一起。近年来作者研究表明,很多这类矿床不仅有块状硫化物矿石,而且还含有浸染状、细脉状、网脉状以及条带状矿石。且这些矿石往往是属同一成因的,因此将这类矿床统统以块状硫化物矿床命名是不符合实际的。比如加拿大Gold-Stream地区与基性火山岩有关的铜锌矿床;其中包含两种矿石,一种是产于绿色和暗色钙质千枚岩中薄层浸染状硫化物矿石,另一种为产于绿岩带地层间隙中的块状硫化物矿石,其间含有磁黄铁矿和黄铜矿的薄层紧密混合  相似文献   

4.
摆浪沟地区地处北祁连山西段奥陶纪弧后盆地火山岩带内,区内古火山机构保留完整,火山岩系为蛇绿岩套上部火山岩的组成部分,岩相发育齐全,与铜矿化密切相关的热水沉积岩——红碧玉岩发育,沿火山机构铜矿化发育普遍,既有与构造破碎带有关的铜矿化,也有与喷流岩有关的火山块状硫化物矿化存在,显示了该区寻找富铜块状硫化物矿床的巨大前景。  相似文献   

5.
甘肃省肃南县摆浪沟矿化区找矿潜力分析   总被引:1,自引:0,他引:1       下载免费PDF全文
摆浪沟地区地处北祁连山西段奥陶纪弧后盆地火山岩带内,区内古火山机构保留完整,火山岩系为蛇绿岩套上部火山岩的组成部分,岩相发育齐全,与铜矿化密切相关的喷流岩——红碧玉岩发育,沿火山机构铜矿化发育普遍,既有与构造破碎带有关的铜矿化,也有与喷流岩有关的火山块状硫化物矿化存在,显示了该区寻找富铜块状硫化物矿床的巨大前景。  相似文献   

6.
云南澜沧老厂矿床形成于滇西南昌宁-孟连晚古生代裂谷早期,是一个在我国具有重要典型意义的火山成因块状多金属硫化物矿床。本文基于作者的工作,并结合前人的一些研究成果,较系统地总结了老厂矿床的容矿火山岩系、矿床结构、矿体形态、矿石结构构造、矿物组合、蚀变分带等方面的特征,进而通过与火山成因块状硫化物矿床的描述性模式及其主要类型的对比,探讨老厂矿床的典型性。  相似文献   

7.
阿舍勒块状铜-锌硫化物矿床产于中泥盆统阿舍勒组以英安质为主的钙碱性火山岩系中.矿化发生于中酸性火山喷发活动行将结束的阶段.矿床受岩性、火山穹丘和断裂控制.成矿物质主要来自火山岩浆热液、火山岩及海水.矿液主要由岩浆水和海水组成.矿床的形成经历了火山喷发沉积期、热液沉积充填期和矿床变质期.矿床是海底火山作用形成的热液沉积-交代充填成因的块状硫化物型矿床,可与黑矿型矿床对比.  相似文献   

8.
麦兹火山-沉积盆地内铅锌矿呈似层状、透镜状,矿石构造以条纹条带状、块状、斑杂状为主,矿物成分相对简单,矿体直接容矿围岩为火山-沉积岩.矿床δ34S值为-20.6‰~-10‰;矿床石英流体包裹体水的δD值为-89.1‰~-49.48‰,δ18OSMOW值为4.7‰~1.2‰.矿化层中方解石的δ13C值介于-6.7‰~-14.3‰之间,δ18O值在10.3‰~12.9‰之间.矿床属火山-沉积岩容矿的块状硫化物矿床,介于典型的火山岩容矿的块状硫化物型矿床(VHMS)和典型沉积岩容矿的硫化物矿床(SEDEX型)之间的过渡类型(一种新类型块状硫化物矿床).  相似文献   

9.
本文分三部分:(一)中国西北地区海相火山岩系特征与块状硫化物矿床的分布。介绍了我国秦岭、祁连、昆仑、阿尔泰、北山—天山各山系及东西准噶尔多时代时控火山岩石系列、岩石组合与块状硫化物矿床分布。并指出块状硫化物矿床与亚碱质钙碱系列细碧-石英角班岩岩石组合关系密切。(二)、中国西北块状硫化物矿床地质特征及其分类问题。本部分从我国西北海相火山岩地区块状硫化物矿床的岩石组分、岩石结构构造、岩体宏观特征、近矿围岩及蚀变等方面初步总结了我国西北海相火山岩地区的坎状硫化物矿床地质基本特征,并与国外同类型矿床进行类比。探讨  相似文献   

10.
红太平多金属矿床地质特征及区域找矿意义   总被引:1,自引:0,他引:1  
宋群 《吉林地质》1991,10(4):22-28
红太平多金属矿床产于延边古生代地槽区二叠系海相火山岩中及其与碎屑沉积岩的过渡带上。矿体呈层状,矿石具典型的沉积构造,矿石硫同位素组成与国内变质火山岩铜矿床相似,气液包裹体氢氧同位素组成介于大气循环水和变质水之间。因此,初步认为矿床属与火山热液或热泉活动有关的块状硫化物型矿床。  相似文献   

11.
宋志高 《矿床地质》1984,3(2):11-20
在成矿规律学的研究中,许多研究者常把优地槽的发展演化与矿床形成阶段相结合并力图给予模式化,认为块状硫化物矿床是优地槽发展初期的坳陷阶段,地槽基底下坳带来巨厚沉积和强烈火山作用时期,与火山和沉积作用有关的形成物(毕利宾,1950;斯米尔诺夫,1973)。  相似文献   

12.
李辉 《甘肃地质》2008,(3):27-35
刘家坪黄铁矿型块状硫化物铜-锌矿床是一个面临闭坑的矿山。对矿区刘家坪组火山岩机构的研究,将是进一步寻找矿体的关键。通过野外地质调查及对刘家坪铜-锌矿区刘家坪组火山岩系的岩石矿物组合和结构构造、岩石化学成分、稀土元素地球化学特征的研究,初步确定了矿区古火山机构及其岩相构造的基本特征,建立了火山岩层序、喷发旋回和喷发类型。  相似文献   

13.
In the Precambrian System of the Yangtze and Cathaysian plates six ore-bearing formations can be identified: the Cu-Pb-Zn-bearing formations in volcanic rocks of marine facies of the Neoarchean-Paleoproterozoic, Cu-Au-bearing formations and Pb-Zn-bearing formations in volcanic rocks of marine facies of the Mesoproterozoic, Pb-Zn-bearing formations in volcaniclastic rock and carbonate rock of the Neoproterozoic, Fe-Mn-bearing formations in the volcaniclastic rock of the Neoproterozoic, and Ni-Cr-serpentine-bearing formations in ophiolite and ultrabasic rock of the Meso- and Neoproterozoic. They were mostly formed in the marginal rift valleys of the Yangtze and Cathaysian plates, where occur stratabound and stratiform ore deposits, thermal deposits and porphyry polymetallic deposits. The six regions with ore-bearing formations have good prospects for ore deposits.  相似文献   

14.
浙赣中生代火山岩岩相与铀矿床类型研究   总被引:2,自引:0,他引:2  
浙赣火山岩分布广泛并且产有重要的火山岩型铀矿床(赣杭构造带发育有五十一个火山岩型铀矿床)。通过对浙赣中生代火山岩相的划分及其特征的描述,划分出与其相对应的火山岩型铀矿床类型,即潜火山相对应于次火山岩型铀矿床、火山通道相对应于火山角砾岩筒型铀矿床、火山侵出相及火山喷发相之喷溢亚相对应于火山熔岩型铀矿床、火山喷发相之爆发亚相对应于火山碎屑岩型铀矿床、喷发沉积相对应于沉积火山碎屑岩型铀矿床。说明火山岩相与铀矿类型之间存在某种联系,研究火山岩相与其相对应的铀矿床对寻找火山岩型铀矿床有一定的指导意义。  相似文献   

15.
云南澜沧老厂是三江成矿带南段最重要的铅锌铜钼多金属矿床之一.根据不同的赋矿特征、含矿岩性、矿石构造及成矿元素将澜沧老厂多金属矿床矿石类型系统地划分为铅锌硫化矿石、铅锌氧化矿石、颗粒状含铜黄铁矿石、块状含铜黄铁矿石、夕卡岩型矿石及斑岩型钼矿石6种类型.矿体产状、微量元素地球化学、年代学证据均表明铅锌硫化矿石、颗粒状含铜黄铁矿石及块状含铜黄铁矿石为火山喷流沉积型成因(VMS型),而铅锌氧化矿石、夕卡岩型矿石及斑岩型钼矿石为斑岩热液型成因.其中,铅锌硫化矿石、颗粒状含铜黄铁矿石及块状含铜黄铁矿石的主控矿因素为地层;铅锌氧化矿石为构造;夕卡岩型矿石为岩性;斑岩型钼矿石为岩体.  相似文献   

16.
云南澜沧老厂是三江成矿带南段最重要的铅锌铜钼多金属矿床之一.根据不同的赋矿特征、含矿岩性、矿石构造及成矿元素将澜沧老厂多金属矿床矿石类型系统地划分为铅锌硫化矿石、铅锌氧化矿石、颗粒状含铜黄铁矿石、块状含铜黄铁矿石、夕卡岩型矿石及斑岩型钼矿石6种类型.矿体产状、微量元素地球化学、年代学证据均表明铅锌硫化矿石、颗粒状含铜黄铁矿石及块状含铜黄铁矿石为火山喷流沉积型成因(VMS型),而铅锌氧化矿石、夕卡岩型矿石及斑岩型钼矿石为斑岩热液型成因.其中,铅锌硫化矿石、颗粒状含铜黄铁矿石及块状含铜黄铁矿石的主控矿因素为地层;铅锌氧化矿石为构造;夕卡岩型矿石为岩性;斑岩型钼矿石为岩体.  相似文献   

17.
姜福芝 《矿床地质》1983,2(4):11-18
建国以来,我国在火山矿床的地质勘探和研究工作方面都积累了丰富的资料,并且有不少关于矿床成因和类型划分方面的叙述。作者近几年来有机会接触到一些这方面的工作。这里试将海底火山活动的重要产物之一——海相火山铁铜矿床作一个比较系统的成因类型的划分。限于水平,不当之处请批评指正。  相似文献   

18.
Most ore-forming characteristics of the Langshan-Zha‘ertaishan hydrothermal exhalation belt, which consists of the Dongshengmiao, Huogeqi, Tanyaokou and Jiashengpan large-superlarge Zn-Pb-Cu-Fe sulfide deposits, are most similar to those of Mesoproterozoic SEDEX-type provinces of the world. The characteristics include: (1) All deposits of this type in the belt occur in third-order fault-basins in the Langshan-Zha‘ertaishan aulacogen along the northern margin of the North China Platform; (2) these deposits with all their orebodies hosted in the Mesoproterozoic impure dolomite-marble and carbonaceous phyllite (or schists) have an apparent stratabound nature; ores display laminated and banded structures, showing clear depositional features; (3) there is some evidence of syn-sedimentary faulting, which to a certain extent accounts for the temporal and spatial distribution and the size of the orebodies in all deposits and the formation of intrabed conglomerates and breccias; (4) they show lateral and vertical zonation of sulfides; (5) The Cu/(Pb Zn Cu) ratio of the large and thick Pb Zn Cu orebodies gradually decreases from bottom to top; and (6) barite is interbedded with pyrites and sometimes with sphalerite. However, some characteristics such as the Co/Ni radio of the pyrites, the volcanism, for example, of the Langshan-Zha‘ertalshan metallogenic belt, are different from those of the typical SEDEX deposits of the world. The meta-basic volcanic rock in Huogeqi, the sodic bimodal volcanic rocks in the Dongshengmiao and potassic bimodal-volcanic rocks with blastoporphyfitic and blasto-glomeroporphyritic texture as well as blasto-amygdaloidal structure in the Tanyaokou deposits have been discovered in the only ore-bearing second formation of the Langshan Group in the past 10 years. The metallogeny of some deposits hosted in the Langshan Group is closely related to syn-sedimentary volcanism based on the following facts: most of the lead isotopes in sphalerite, galena, pyrite, pyrrhotite and chalcopyrite plot on both sides of the line for the mantle or between the lines for the mantle and lower crust in the lead isotope composition diagram; cobalt content of some pyrites samples is much higher than the nickel content (Co/Ni= 11.91-12.19). Some volcanic blocks and debris have been picked out from some pyritic and pyrrhotitic ores. All Zn-Pb-Cu-Fe sulfide orebodies in these deposits occur in the strata overlying metamorphic volcanic rocks in the only ore-bearing second formation. In the Jiashengpan deposit that lacks syn-sedimentary volcanic rocks in the host succession only Pb and Zn ores occur without Cu ore, but in the Dongshengmiao, Tanyaokou and Huogeqi deposits with syn-sedimentary volcanic rocks in the host succession Cu ores occur. This indicates a relatively higher ore-forming temperature. The process of synsedimentary volcanic eruption directly supplied some ore-forming elements, and resulted in secular geothermal anomaly favorable for the circulation of a submarine convective hydrothermal system, which accounts for the precipitation of deep mineralizing fluids exhaling into anoxidic basins along the syn-sedimentary fault system in the Langshan-Zha‘ertai rift. The Dongshengmiao, Tanyaokou, and Huogeqi deposits hosted in the Langshan Group appear to be a transitional type of mineral deposit between SEDEX and VMS-types but with a bias towards SEDEX, while the Jiashengpan deposit hosted in the Zha‘ertai Group is of a characteristic SEDEX type. This evidence, together with other new discoveries of Mesoproterozoic volcanic rocks and the features of lithogeny and metallogeny of the Bayun Obo deposit in the neighborhood emphasize the diversity, complexity and uniqueness of the Mesoproterozoic Langshan-Zha‘ertal-Bayun Obo ore belt.  相似文献   

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