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拜仁达坝矿区位于大兴安岭西坡银多金属成矿带,是近年来新发现的又一大型银多金属矿床.内蒙古自治区第九地质勘查院对矿区进行了详查①.对矿床的成因、成矿流体等方面的研究尚未见报道. 相似文献
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内蒙古拜仁达坝及维拉斯托银多金属矿床的硫和铅同位素研究 总被引：10，自引：3，他引：7
拜仁达坝和维拉斯托是近年来在内蒙古东部地区发现的2个大型银多金属矿床,文章对其开展了硫和铅同位素研究。结果表明,拜仁达坝矿床矿石中硫化物的δ34S值为-4.0‰～+1.6‰,维拉斯托矿床矿石中硫化物的δ34S值为-0.8‰～+2.0‰,与岩浆热液型矿床的硫同位素值接近,表明这2个矿床中的硫主要来自岩浆。拜仁达坝矿区43件金属硫化物的206Pb/204Pb值为18.333～18.515,207Pb/204Pb值为15.532～15.656,208Pb/204Pb值为38.057～38.610;维拉斯托矿区20件金属硫化物的206Pb/204Pb值为18.304～18.377,207Pb/204Pb值为15.520～15.610,208Pb/204Pb值为38.112～38.435。拜仁达坝东矿区矿石中的铅同位素组成与维拉斯托矿区相似,变化范围小,相对贫放射性铅同位素,并且均为混合铅。矿石中的铅可能来自围岩地层及深源岩浆。 相似文献
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黄河吐西铜多金属矿位于内蒙古自治区通辽市扎鲁特旗北部,地处大兴安岭中南段多金属成矿带。近年来,笔者参与了该矿区的矿产普查工作,初步掌握了该矿区的地质及物化探特征,并发现有数条规模较大的矿化蚀变带及铜矿体,认为该区成矿条件较好,具有良好的找矿远景。 相似文献
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大兴安岭中南段银锡多金属成矿带位于中亚造山带东部,近年来找矿成果丰硕。在对边家大院、拜仁达坝-维拉斯托、双尖子山3个银锡多金属矿床的成矿特征进行系统分析的基础上,探讨本区银锡多金属矿成矿条件与找矿潜力。结果显示,本区银锡多金属成矿与花岗质岩浆侵入密切相关,成岩与成矿具多期多阶段特征,主要发生于早白垩世,峰值为130~150 Ma。成矿岩体多具高硅、低镁、富碱的特征,形成于蒙古-鄂霍茨克洋和古太平洋两大构造体系叠加影响的伸展背景。银锡多金属成矿受地层-构造-岩浆岩三位一体联合控制,成矿条件优越,找矿潜力较大。在边家大院矿床西区的深部和外围以及北大山、磨盘山岩体的周边,有找寻锡多金属矿床的潜力。借鉴大兴安岭北段的找矿经验,应注重在本区中生代火山岩中找寻银铅锌多金属矿床。 相似文献
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大兴安岭南段是我国重要的铅锌银锡多金属成矿集中区,但长期以来找矿重点一直以铅锌银为主,锡矿基本没有列入重点找矿对象。近几年该地区锡矿找矿取得重大进展,相继发现了维拉斯托大型锡铷铌钽矿和园林子北山、边家大院中型锡矿等,显示锡矿勘探的良好前景。锡矿与铅锌银矿存在密切的时空关系,并具一定的矿化分带特征。前人通过矿床地质特征及成岩、成矿年代学研究,也论证了锡与铅锌银应属同一成矿系统的产物。本文基于这种认识,分析研究最新锡矿勘查和研究成果,充分利用区域锡地球化学异常资料,总结了该地区锡成矿地质特征、成矿规律,认为锡成矿地质体为晚侏罗世-早白垩世中酸性侵入岩体,锡矿产出的有利部位为岩体顶部、与围岩接触带、锡地球化学异常、铅锌银矿产地的深部,各项有利信息表明,区内锡矿具有很大资源潜力。据此,圈定了9个锡矿找矿远景区,其中赤峰克什克腾(黄岗、维拉斯托、拜仁达坝为代表)、白音诺尔-浩布高和查干哈达-先锋远景区锡资源潜力大,具有较好的找矿前景。 相似文献
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昌图锡力位于大兴安岭中南段锡林浩特-霍林郭勒多金属成矿带上,周边已发现花敖包特、扎木钦等大型铅锌银矿床,区域上具有较大找矿潜力。以1∶5万区域地质调查工作为基础,通过在内蒙古昌图锡力地区开展1∶5万和1∶1万土壤测量,确定了异常的范围,缩小了找矿靶区,通过异常的元素组合特征确定找矿的主攻矿种为锰银铅锌矿;利用激电中梯测量、激电测深等物探方法进一步圈定出矿体空间分布位置与形态,为勘探工程布设提供了直接依据;在物化探综合异常套合较好及地表矿化发育地段,开展钻探工程验证,勘探到了锰银铅锌矿体,取得了较好的找矿效果。综合运用物化探方法在该区找矿是可行、有效的,对区域上的矿产勘查工作具有指导意义。 相似文献
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The Weilasituo and Bairendaba Zn–Pb–Ag–Cu–(Sn–W) sulphide deposits are located in the southern part of Great Xing'an Range of Inner Mongolia in China. The deposits are located at shallow depths in the newly discovered Weilasituo porphyry hosting Sn–W–Rb mineralization. The mineralization at Weilasituo and Bairendaba consist of zoned massive sulphide veins within fractures cutting the Xilinhot Metamorphic Complex and quartz diorite. The Weilasituo deposit gradually zones from the Cu-rich Zn–Cu sulphide mineralization in the west to Zn-rich Zn–Cu sulphide mineralization in the east. The Bairendaba deposit has a Cu-bearing and Zn-rich core through a transitional zone devoid of copper to an outer zone of Zn–Pb–Ag mineralization. Three main veins contain more than 50 wt.% of the contained metal in the two deposits with their metal ratios displaying a systematic and gradual increase in Zn/Cu, Pb/Zn and Ag/Zn ratios from the western part of Weilasituo to the eastern part of Bairendaba.Three stages of vein-type mineralization are recognized. Early, sub-economic mineralization consists of a variable proportion of euhedral arsenopyrite, pyrite, quartz, and rare wolframite, scheelite, cassiterite, magnetite and cobaltite. This was succeeded by main stage mineralization with economic concentration of zoned Cu, Zn, Pb and Ag sulphide minerals along strike within the veins. The zones consist of the assemblages: (1) pyrrhotite–Fe-rich sphalerite–chalcopyrite(–quartz–fluorite) at west Weilasituo; (2) pyrrhotite–Fe-rich sphalerite–chalcopyrite(–galena–tetrahedrite–quartz–fluorite) at east Weilasituo; (3) pyrrhotite–Fe-rich sphalerite–chalcopyrite(–galena–tetrahedrite–quartz–fluorite) in the centre of Bairendaba; (4) pyrrhotite–Fe-rich sphalerite–galena(–chalcopyrite–tetrahedrite–quartz–fluorite) in the transition zone of Bairendaba; and (5) pyrrhotite–Fe-rich sphalerite–galena–tetrahedrite(–chalcopyrite–falkmanite–argentite–pyrargyrite–quartz–fluorite) in the outer zone at Bairendaba. Post-main ore stage is devoid of sulphides and characterized overprinting of fluorite, sericite, chlorite, illite, kaolinite and calcite.Zircon SHRIMP U–Pb dating, Zircon LA–ICP–MS U–Pb dating, molybdenite Re–Os isochron dating, and muscovite Ar–Ar dating indicate the Beidashan granitic batholith was intruded at 140 ± 3 Ma (MSWD = 3.3), the porphyritic monzogranite from marginal facies of the Beidashan batholith was intruded at 139 ± 2 Ma (MSWD = 0.75), the mineralized quartz porphyry was intruded at 135 ± 2 Ma (MSWD = 0.91), the greisen mineralization occurred at 135 ± 11 Ma (MSWD = 7.2), and the post-main ore stage muscovite deposited at 129.5 ± 0.9 Ma. The new geochronology data show the porphyry Sn–W–Rb and vein-type sulphide mineralization are contemporaneous with granitic magmatism in the region.The metal zonation at the Weilasituo and Bairendaba deposits is a result of progressive metal deposition. This was during the evolution of a metal-bearing fluid along the strike of the veins and during the main stage of ore formation at the upper part of the deep-seated porphyry Sn–W–Rb system. This progressive zonation indicates that the deposits represent end-numbers formed from one ore-forming fluid, which moved from west to east from the porphyry. The metal zonation patterns of the major veins are consistent with metal-bearing fluid entering the system with the precipitation of chalcopyrite proximally and sphalerite, galena and Ag-bearing minerals more distally. We show that the mechanism of metal deposition is therefore controlled by thermodynamic conditions resulting in the progressive separation of sulphides from the metal-bearing fluid. The temperature gradient between the inflow zone and the outflow zone appears to be one of the key parameters controlling the formation of the metal zonation pattern. The sulphide precipitation sequence is consistent with a low fS2 and low fO2 state of the acidic metal-bearing fluid. The metal zonation pattern provides helpful clues from which it is possible to establish the nature of fluid migration and metal deposition models to locate a possible porphyry mineralization at depth in the Great Xing'an Range, which is consistent with the geology of the newly discovered porphyry Sn–W–Rb system. 相似文献
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内蒙古拜仁达坝铅-锌-银矿床:元素分带及其成因 总被引：2，自引：0，他引：2
内蒙中东部拜仁达坝矿床是一个以石炭纪石英闪长岩及锡林浩特杂岩为赋矿围岩的断裂充填型热液脉状铅-锌-银多金属矿床。矿床分东西两个矿段,拜东矿区1号矿体及拜西矿区3号矿体是矿床的主要矿体。矿体沿着走向方向具有明显的矿化分带特征,锌-铜矿石、锌矿石及铅-锌-银矿石依次从矿化中心向外侧产出。代表性矿体拜东矿区1号矿体的块段金属量、平均品位及元素比值由西向东沿着走向方向显示出明显而系统的变化规律。锌的块段金属量由西向东逐渐减少,铅和银的矿段金属量则先增加后下降;锌的块段平均品位由西向东逐渐降低,铅和银的块段平均品位则先上升随后下降;Ag/Pb值先上升随后下降,Ag/Zn和Pb/Zn值则逐渐上升。这种矿化的分带性可能是成矿热液在中偏高温向低温演化的过程中,沿着矿体的走向方向从矿化中心向外侧运移,在矿体不同位置有选择地将成矿物质卸载的结果。而成矿热液在断裂系统内与不同比例大气水的混合则可能是成矿系统内温度梯度形成的重要原因。矿床中不同位置的矿物组合记录了成矿热液中硫逸度由高向低,pH值由低向高的演化过程。拜仁达坝矿床与邻近的维拉斯托矿床组成了一个由温度场控制的具有明显矿化分带现象的低硫化热液脉状多金属成矿系统。 相似文献
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大兴安岭南段维拉斯托锡多金属矿床LA-ICP-MS锡石和锆石U-Pb年龄及其地质意义 总被引：6，自引：0，他引：6
维拉斯托锡多金属矿床位于大兴安岭南段西坡的内蒙古克什克腾旗,是近年来发现的一个以锡为主,共伴生钨、锌、铜、钼、铷、铌和钽的大型矿床。矿化类型包括深部以锡为主,伴生锌、铷、铌和钽的蚀变花岗岩型矿体;中部以锡为主,伴生铜和锌的隐爆角砾岩型矿体及浅部锡、钨、锌、铜和钼的石英大脉型和网脉型矿体。该矿床的主要工业矿体为石英脉型,呈北北东向产于古元古界宝音图群和华力西期石英闪长岩中的断裂破碎带内,而蚀变花岗岩型和隐爆角砾岩型矿石的品位较低。文中选取1件石英脉型锡矿体中的锡石样品进行了LA-ICP-MS锡石U-Pb定年,获得锡石的206Pb/207Pb238U/207Pb等时线年龄为(136.0±6.1) Ma(MSWD=0.94),207Pb/206Pb238U/206Pb谐和年龄为(132.3±5.4) Ma(MSWD=2.8),表明维拉斯托锡多金属矿床形成于早白垩世;选取1件与成矿相关的北大山岩体花岗岩样品开展了LA-ICP-MS锆石U-Pb定年,获得206Pb/238U年龄为(140±2) Ma(MSWD=0.10),表明成矿岩体亦形成于早白垩世。维拉斯托锡多金属矿床属于与花岗岩有关的岩浆热液型矿床。通过统计大兴安岭南段主要锡多金属矿床的成矿年龄和成矿岩体的年龄,发现几乎所有的锡多金属矿床均形成于140～135 Ma期间,表明早白垩世是大兴安岭南段锡多金属矿床成矿高峰期。 相似文献
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维拉斯托-拜仁达坝锌铜多金属矿床为近几年大兴安岭中南段西坡发现的较大的2个银多金属矿床,主要对2个矿床矿石矿物组合分析和对比,对主要的矿石矿物组合进行扫描电子显微镜-能谱分析和电子探针分析显示:从早期到晚期,矿物组合从高温钨酸盐和氧化物-复硫化物-硫化物-低温含锑硫盐矿物(锑化物);银的赋存状态主要为可见银矿物,其次为晶格银(类质同象)和次显微包裹银,其中生成顺序依次为含银黝铜矿+银锑黝铜矿+黝锑银矿-辉锑铅银矿+柱硫锑铅银矿+深红银矿+锑银矿.根据不同成矿阶段的矿物组合和流体包裹体特征得出:成矿早期在氧化偏酸性环境下,W、Sn等以钨酸、钨酸盐等形式迁移,Zn2+、Pb2+、Cu+等金属离子以氯络合物形式迁移;随着黑钨矿气化沉淀及成矿流体物理化学条件的变化,成矿中-晚期成矿环境变为弱碱性还原条件,成矿流体中金属离子以硫氢络合物迁移为主,伴着温度降低和围岩的水-岩作用,硫氢络合物分解,导致磁黄铁矿等硫化物、硫锑银矿物、硫锑铅矿等依次沉淀. 相似文献
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维拉斯托地区位于大兴安岭成矿带内,区域内构造发育丰富,成矿条件优越,继续找矿的潜力巨大.采取向上延拓、小波分析、边界识别等技术对维拉斯托地区的航磁数据进行处理,结合已有地质资料,进一步完善了维拉斯托地区的地质构造,梳理出维拉斯托、拜仁达坝矿床的形成过程.通过航磁异常视磁化率成像反演结果提取出维拉斯托北侧地下的隐伏岩体信息.结果表明:（1）维拉斯托地区的北东向左行剪切性质断裂破碎带整体控制了该区的岩浆活动和矿体运移,同时该断裂带也是东南负磁异常与西北正磁异常之间的磁性过渡带,因此已知矿点与研究区构造分布、磁性强弱分布密切相关.磁异常反演结果显示维拉斯托北侧地下深部可能存在隐伏岩体.据此,本文划分了3处成矿远景区,可为后续找矿工作提供一定参考.（2）向上延拓与小波分析结果显示白音查干-达青牧场断裂（F1）和助力可河断裂（F2）形成时间早、向地下延伸深,是控制维拉斯托地区岩浆活动和构造发育的主断裂.结合倾斜角法等边界识别结果,对研究区内断裂与磁性岩体分布进行了较为精细的拟定,共识别出14条断裂与11处磁性岩体,根据其形成与分布发现维拉斯托是研究区的成矿中心,来自深部的成矿流体经F1与F2在维拉斯托附近上升富集,再由西向东,沿中部北东向断裂破碎带（F3、F4、F5、F6、F7、F10等）运移至拜仁达坝,最终逐渐形成大兴安岭地区两个典型的多金属矿床. 相似文献
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大兴安岭南段发育大井、双尖子山、布金黑、拜仁达坝、维拉斯托等多个具有典型后生特征的热液脉状铅锌银锡多金属矿床。为了查明上述矿床在成矿流体、成矿物质等方面的特征与差异,进而总结大兴安岭南段热液脉状矿床成矿作用特点,本次研究在野外地质调研的基础上,对上述矿床进行了流体包裹体、激光拉曼和氢氧硫同位素的研究,并取得了如下主要的认识:(1)双尖子山银多金属矿床成矿流体属简单盐水体系热液,维拉斯托和布金黑矿床成矿流体属富碳质盐水体系热液,而大井铜矿成矿流体则为含子矿物的不均匀盐水体系热液;(2)大井、布金黑、拜仁达坝和维拉斯托等矿床早期成矿流体均来自于岩浆热液,但布金黑、拜仁达坝和维拉斯托矿床成矿流体在运移过程中明显地受到了大气降水和地层中有机质的影响;(3)大兴安岭南段多数热液脉状多金属矿床矿石硫同位素δ34S值具有岩浆来源特点,个别矿床硫同位素δ34S值偏高可能是由复杂的岩浆源区性质及地层硫混入所引起。总的来说,大兴安岭南段不同热液脉状矿床在物质来源和流体演化方面的差异明显,而这也体现了该区中生代热液成矿作用的多样性和复杂性特点。 相似文献
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山西高凡银金矿床黄铁矿的微量元素标型特征及其应用 总被引：2，自引：0，他引：2
高凡银金矿床黄铁矿的微量元素研究发现富Au、Ag、Pb、Zn、As、Sb,贫Co、Ni、Se,且S/Se较大,S/As和Fe/(Pb+Zn)较小,As/(Co+Ni)、(Pb+Zn)/(Co+Ni)>10。同时高凡矿田中的滩上铜钼矿化点的黄铁矿则显示相反的特征。总结出一套区分两类矿化黄铁矿微量元素的标型特征,对高凡矿田和五台地区各矿化点的判别和评价中显示了一定的适用性,可作为本区寻找同类金银矿床的找矿标型特征。 相似文献
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《International Geology Review》2012,54(9):1031-1051
The geotectonic units of Zhejiang Province include the Yangtze Plate in the northwest juxtaposed against the South China fold system in the southeast along the Jiangshan–Shaoxing fault. The South China fold system is further divided into the Chencai–Suichang uplift belt and the Wenzhou–Linhai geotectogene belt, whose boundary is the Yuyao–Lishui fault. The corresponding metallogenic belts are the Mo–Au(–Pb–Zn–Cu) metallogenic belt in northwest Zhejiang, the Chencai–Suichang Au–Ag–Pb–Zn–Mo metallogenic belt, and the coastal Ag–Pb–Zn–Mo–Au metallogenic belt. The main Mesozoic metal ore deposits include epithermal Au–Ag(Ag), hydrothermal vein-type Ag–Pb–Zn(Cu), and porphyry–skarn-type Mo and vein-type Mo deposits. These ore bodies are related to the Mesozoic volcanic-intrusive structure: the epithermal Au–Ag(Ag) deposits are represented by the Zhilingtou Au–Ag deposit and Houan Ag deposit and their veins are controlled by volcanic structure; the hydrothermal vein-type Ag–Pb–Zn deposits are represented by the Dalingkou Ag–Pb–Zn deposit and also controlled by volcanic structure; and the porphyry–skarn-type Mo deposits are represented by the Tongcun Mo deposit and the vein-type Mo deposits are represented by the Shipingchuan Mo deposit, all of which are related to granite porphyries. These metal ore deposits have close spatio-temporal relationships with each other; both the epithermal Au–Ag(Ag) deposits and the hydrothermal vein-type Ag–Pb–Zn deposits exhibit vertical zonations of the metallic elements and form a Mo–Pb–Zn–Au–Ag metallogenetic system. These Jurassic–Cretaceous deposits may be products of tectonic-volcanic-intrusive magmatic activities during the westward subduction of the Pacific Plate. Favourable metallogenetic conditions and breakthroughs in the recent prospecting show that there is great resource potential for porphyry-type deposits (Mo, Cu) in Zhejiang Province. 相似文献