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1.
There are two types of gold ore in Shibaqinghao gold deposit, mylonite ore and quartz vein ore. Pyrite accompanying with native gold in mylonite ore has Fe from 43.66 to 45.32 wt% and S from 52.64 to 53.55 wt%. It is clear that this kind of pyrite is poor in both sulphur and iron. That means that the mylonite ore may be related to metamorphic water. Pyrite in the quartz vein ore has Fe from 44.38 to 45.30 wt% and S from 53.08 to 54.00 wt%. It means that this kind of pyrite is poor in iron but rich in sulphur, while the quartz vein ore may be related to magma water. 相似文献
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Shibaqinghao gold deposit is situated in the western part of the northern margin of the North China Craton. It is controlled by an E - W trending tectonic zone that is located in the middle unit of Dongwufenzi group which consists of a sequence of greenschist - facies metamorphic rocks in an Archean greenstone belt.In Shibaqinghao gold deposit there are two types of gold ore, a mylonite ore and a quartz vein ore. Mylonite ore bodies were formed during ductile shearing stage in the Early Proterozoic, whereas quartz vein ore bodies might have been formed in the Mesozoic time.Pyrite accompanied with native gold in the mylonite ore has sulpfur of which δ34S values range from - 5.8 to + 0.8 per mil, similar to the values of mantle- derived sulphur. These data suggest that gold in the mylonite ore be derived from the country rocks which originated directly in the upper mantle.Pyrite in quartz vein ore has the δ34 S values between + 3.0 and + 11.0 per mil, similar to the values of some granitic rocks. These facts indicate that the gold in the quartz vein ore is related to some granitic magma generated in the crust.This study revealed that two different mineralization occurred at different geological times and in different environments but in the same place, resuling in the Shibaqinghao gold deposit. 相似文献
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黄铁矿和石英是大庆岭金矿的主要载金矿物。对黄铁矿和石英的微量元素及其变化、S/Fe值、晶形、热电导型和石英的化学成分、晶胞参数、热发光、包体爆裂及红外光谱等方面的研究表明 :该矿床成因具多元性 ,为浅成热液矿床 ;成矿物质来源具多源性 ,既有岩浆来源又有地层来源。富金矿物形成于高硫逸度和较氧化的条件下 ,矿体剥蚀深度不大 ,且具有东低西高的趋势。 相似文献
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IntroductionSo - called Central inner Mongolia in the papermeans the area including Daqing Mountains, WulaMountains, Serteng Mountains and the grasslandsnorth of the mountains. Tectonically it's located inthe western part at the northern margin of the Nor… 相似文献
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There are two types of gold ore in Shibaqinghao gold deposit, a mylonite ore and a quartz - vein ore. Pb isotope compositions for mylonite ore are characterized by lower Pb isotope ratios ranging from 16.63 to 17.45 (206Pb/204Pb), 15.31 to15.48 (207Pb/204pb), 36.52 to 38.85 (208Pb/204Pb). They are scattered very close to a model curve of the mantle evolution. These ratios suggest that gold in the mylonite ore might be derived from the country rocks, which originated directly in the upper mantle. Pb isotope compositions for quartz - vein ore are characterized by higher Pb isotope ratios ranging from 18.23 to 19.74 (206Pb/204Pb), 15.69 to 15.89 (207Pb/204Pb), 38.64 to 40. 13 (208Pb/204Pb). They are scattered very close to a model curve of the upper crustal evolution. These facts indicate that the gold in the quartz - vein ore might be related to some granitic magma generated in the crust. 相似文献
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There are four mineralization types of gold in Central Inner Mongolia: mylonite type, quartz vein type, quartzpotash- feldspar vein type and alteration type.Ore bodies of mylonite type were controlled by ductile shear zone. Both of ore and gangue minerals were undergone ductile deformation. Mineralization age is about 2040Ma and represents the metallogenetic process in deep tectonic level.There are three types of quartz veins differed from genesis mechanism. Small scaled, lens- shaped quartz veins formed during ductile shearing are found in mylonite ore bodies. Decation quartz veins are in the ore bodies of alteration type. Infiltration quartz veins are main gold- bearing bodies for some gold deposits such as Bainaimiao and Saiwusu gold mines. It also occurred in many other deposits from the middle Proterozoic to the Mesozoic.Quartz potash- feldspar veins are observed in the Palaeozoic and occurred in middle tectonic level.Gold deposits of alteration type such as Donghuofang and Saihudong occurred in shallow tectonic level of the Mesozoic.In short, from the Proterozoic to the Mesozoic, mineralization types varied from mylonite type to quartz potash- feldspar vein type and to alteration type. Gold - bearing quartz veins changed from syn - ductile - shearing quartz vein to infiltration vein and to decation quartz vein. Mineralization developed from deep to middle and to shallow level. 相似文献
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以江山—绍兴断裂带北东端桐树林～潘村韧性剪切带中的金矿特征为例,阐述韧性剪切带与金矿化的关系,认为该韧性剪切带对金矿的成矿和窑矿具明显的控制作用,剪切带与神功期石英闪长岩的接触部位是金矿分布的有利地段。剪切带内浅色蚀变带和糜棱岩带及成群出现的含碎裂状黄铁矿的石英脉是良好的找金标志。根据韧性剪切带具有长期多次活动、产状变化复杂的特点,今后应注意在剪切带深部寻找工业矿体。 相似文献
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ZHANG Hongying 《东北亚地学研究》2002,(1)
There are two types of gold ore in Shibaqinghao gold deposit, a mylonite ore and a quartz - vein ore. Pb isotope compositions for mylonite ore are characterized by lower Pb isotope ratios ranging from 16. 63 to 17.45 (206Pb/204Pb) , 15. 31 tol5.48 (207Pb/204Pb) , 36.52 to38.85 (208Pb/204Pb). They are scattered very close to a model curve of the mantle evolu-tion. These ratios suggest that gold in the mylonite ore might be derived from the country rocks, which originated directly in the upper mantle. Pb isotope compositions for quartz - vein ore are characterized by higher Pb isotope ratios ranging from 18.23 to 19.74 (206Pb/204Pb) , 15. 69 to 15. 89(207Pb/204Pb) , 38. 64 to 40. 13 (208Pb/204Pb). They are scattered very close to a model curve of the upper crustal evolution. These facts indicate that the gold in the quartz - vein ore might be relat-ed to some granitic magma generated in the crust. 相似文献
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查干此老金矿位于内蒙古自治区乌拉特中旗境内,为岩浆热液型金矿床。该文系统阐述了查干此老金矿区地层、构造及岩浆岩特征,详细介绍了金矿床地质特征。通过对查干此老矿床的地质特征、控矿因素及矿床成因的系统研究,认为矿区的金矿化类型以含金石英脉型为主,兼有破碎蚀变岩型。金矿体赋存于二叠纪斜长花岗岩及志留纪蚀变闪长岩中的石英脉、碎裂岩带及糜棱岩带中,其产状、形态、规模严格受NE向断裂构造带控制,未受后期构造影响。该文对查干此老金矿床的构造背景、物质来源进行了研究,确定了该矿床的成矿模式,对该区的金矿成矿预测,深部及外围找矿工作具有一定的指导意义。 相似文献
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古腊布陶勒盖金矿床位于阿拉善地块巴彦乌拉山中段,金矿体均受韧性剪切带及EW向、NE向、近SN向断裂控制。赋矿层位为褐红色赤铁矿化绢云母石英糜棱岩,不论是石英脉型金矿,还是蚀变岩型金矿均产于这类岩石中,具有一定的层控特征。矿床经过了中元古代原始沉积地层预富集,后期经过改造富集形成了现在的金矿体。脉内矿物中强烈的热液蚀变和矿石中浸染状、角砾状的构造,显示了岩浆热液矿床的特征。在前人研究的基础上,综合分析区内花岗斑岩和矿床特征,认为古腊布陶勒盖金矿床是古亚洲洋整体于三叠纪闭合、石炭纪末期至三叠纪发育了古亚洲地区规模宏大的成矿事件的响应,矿床类型应为花岗岩叠加改造的韧性剪切带金矿。 相似文献
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铧厂沟金矿床北部控矿剪切带地质特征及金的富集规律 总被引：1，自引：0，他引：1
野外调研和室内分析结果表明。区域韧性剪切带在铧厂沟金矿床非常发育，并经历了右行—左行—右行多期（次）活动。北部控矿韧脆性剪切带是区域韧性剪切带演化的产物，以左行剪切为主。位于铁夹树—庙湾北部厚层灰岩的下部。北部金矿带受北部控矿剪切带控制，长度大于1km．厚度约70cm，从地表延伸至1120m标高。未见尖灭趋势。黄铁矿是该类矿石中最重要的金属矿物。自然金是主要金矿物。有明金和显微金两种。矿石结构构造较为复杂。集中反映了热液矿床的构造特征。矿带的形成可划分为热液期和表生期。原生矿石中绝大部分明金、显微金中的包体金和裂隙金都与黄铁矿密切相关。黄铁矿（Ⅰ）经历了韧脆性变形。因而是金的最佳载体矿物。北部韧脆性剪切带的多期（次）活动，使金富集成为工业矿体。结合地质特征，预测该矿带可延伸至1120m以下一定深度。 相似文献
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黄铁矿是重要的金属硫化物矿物,在多种矿床中均有产出,其标型特征对矿床成因、矿体空间分布等具有重要的指示意义。以扬子板块西缘攀西地区白草矿区黄铁矿为研究对象,利用矿相学、电子探针等分析方法来对比研究浸染状、致密块状、斑杂状、网脉状矿石中黄铁矿的标型元素特征。结果表明:白草矿区黄铁矿Fe、S平均含量(质量分数,下同)分别为46.030%、52.815%,介于岩浆成因与热液成因之间,根据矿石特征,黄铁矿以岩浆成因为主,并有少量热液作用参与;将白草矿区黄铁矿δFe-δS特征与金川等典型铜镍硫化物矿床黄铁矿对比,表明白草矿区黄铁矿为典型的岩浆熔离型;由于存在钒钛磁铁矿,Co/Ni值多小于5,说明钒钛磁铁矿与硫化物存在共生关系;岩浆内生成因黄铁矿S/Se值小于15000,白草矿区黄铁矿S/Se值为812~10466,显示白草矿区黄铁矿为岩浆内生成因;Se/Te值随温度降低而升高,显示上述4类矿石黄铁矿结晶顺序为浸染状矿石→致密块状矿石→斑杂状矿石→网脉状矿石;原始地幔标准化主量、微量元素蛛网图显示白草矿区黄铁矿兼具岩浆成因与热液成因。综上所述,攀西地区白草矿区黄铁矿成因主要以岩浆熔离作用为主,并含有少量热液作用。 相似文献
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排山楼金矿床赋存于太古宙建平群东西向韧性剪切带之中。强蚀变糜棱岩即为金矿体及金矿化体。载金矿物为沿糜棱面理分布的细粒黄铁矿、动态重结晶石英集合体及铁白云石。金矿体直接受黄铁矿—黑云母化蚀变带控制。金的赋存状态以晶隙金为主,其次为少量黄铁矿包裹金。金矿化具有不同构造期的特点。金与微量元素的相关性,铅同位素及稀土元素特征都说明金来源于太古宙建平群变质岩。为同韧性剪切带型金矿床。 相似文献
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平度市陶家寨矿区金矿床位于平度市旧店镇西南,属于中温热液裂隙充填石英脉型金矿床,控矿构造以NE向、NNE向断裂为主,具有膨大缩小、分支复合、尖灭再现的特征。区内共圈定金矿体5个,矿体呈脉状、透镜状,严格受断裂带控制。矿石矿物主要为黄铁矿、黄铜矿、方铅矿、闪锌矿等,矿石结构主要为半自形粒状结构、不等粒结构等,矿石构造主要为致密块状构造、团块状构造、网脉状构造、细脉浸染状构造等。矿体围岩为云山单元弱片麻状含石榴石细粒黑云二长花岗岩、北黄单元细粒含黑云二长花岗岩等。 相似文献
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玲珑矿田含有两种类型金矿床,一是蚀变岩型金矿床,二是石英脉型金矿床。该文重点研究玲珑金矿田西山矿区石英脉型金矿床中流体包裹体的特征。石英脉型金矿床分布在玲珑帚状构造之中,含金石英脉受"帚状构造"的断裂和节理控制,有300余条。流体包裹体显微观察研究表明,玲珑石英脉型金矿新鲜花岗岩和钾化花岗岩主要含有H2O包裹体,其次有少量H2O-CO2包裹体;(黄铁)绢英岩通常含较粗粒石英集合体,石英中有丰富的H2O,特别是H2O-CO2包裹体;金矿体(含金石英脉)含有明显数量的H2O-CO2包裹体;特别是存在较大的三相H2O-CO2包裹体。不同期次(世代)石英中H2O和H2O-CO2包裹体的大小、形态、相对含量和丰度变化较大。 相似文献
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山东沂南铜井金矿位于沂沭断裂带的鄌郚-葛沟断裂西侧,是鲁西典型的矽卡岩型金矿。矿石成分主要有自然金、黄铁矿、黄铜矿、石榴子石、方解石、石英等,矿石结构主要有半自形-他形粒状结构、他形填隙结构、压碎结构等,矿石构造类型有浸染状构造、脉状构造、块状构造。矿石岩性主要有黄铁矿化闪长玢岩、黄铁矿化角岩、黄铁矿化磁铁矿化矽卡岩、黄铁矿化大理岩还有部分石英脉型矿石和磁黄铁矿型矿石。成矿期次划分为矽卡岩期、热液期、表生期。该文利用光谱分析对矿石中Au,Ag,Cu,Pb,Zn,As,Sb,Bi 8种微量元素进行相关性分析和聚类分析。利用电子探针对矿石薄片进行微区分析,对矿石元素地球化学等特征进行研究总结,研究表明:光谱中Au,Cu,Ag,Sb四种元素显示了较好的聚类特征,对找矿有较好的指示作用。电子探针数据分析显示Co与Ni的比值大于1,As元素含量较低,矿床呈现岩浆热液成矿与变质热液成矿叠加的特点。 相似文献
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In order to understand the mechanism(s) of gold precipitation in the anorthosite- hosted Sangchon gold deposits in the Hadong area, Korea, chemical speciation and reaction path calculations were accomplished by geochemical modeling.The modeling consisted of three- step procedures: reaction with anorthosite, then the simple cooling of the reacted fluid,and finally the boiling of metalliferous fluid. The principal vein minerals of the Sangchon deposits consist of quartz, sericite,kaolinite, pyrite, galena, chalcopyrite, sphalerite and acanthite. The sulfide mineralization is typically zoned from pyrite (preferentially at vein margins) to galena and sphalerite (toward vein center). Electrum is intimately associated with pyrite + chalcopyrite and sphalerite. By comparing the results of modeling with the observed mineral assemblages and paragenesis,the most appropriate evolution path of ore fluids was suggested as follow: reaction of a single fluid with anorthosite at 300℃,then the isobaric cooling of the fluid at temperatures from 2500° to 100℃3 , and then the boiling and cooling of the fluid due to the decrease of pressure and temperature. Calculations also show that all of the observed alteration minerals formed due to fluid - anorthosite interaction at early period, whereas most of sulfides and electrum were precipitated mainly due to cooling.The abundance of gold in veins depends critically on the ratio of total base metals plus iron to sulfide in the aqueous phase,because gold is transported as Au(HS)2- whose solubility is very sensitive to the sulfide activity. Our results of geochemical modeling generally fit to the observed mineral assemblages and mineral composition, indicating the usefulness of numerical simulation for elucidating the genesis of gold deposits. 相似文献