METALLOGENIC ANALYSIS OF THE DEXING COPPER-GOLD-LEAD-ZINC POLYMETALLIC DEPOSITS, JIANGXI PROVINCE, CHINA

The paper discusses the tectonic setting of the fortnation of the Dexing giant copper-gold-lead-zinc deposit and its geological features and demonstrates in detail the polygenetic compound mechanism of its formation.

Metallogeny of the Baiyangping Lead-Zinc Polymetallic Ore Concentration Area, Northern Lanping Basin of Yunnan Province, China

The Lanping Basin in the Nujiang-Lancangjiang-Jinshajiang （the Sanjiang） area of northeastern margin of the Tibetan Plateau is an important part of eastern Tethyan metallogenic domain. This basin hosts a number of large unique sediment-hosted Pb-Zn polymetallic deposits or ore districts, such as the Baiyangping ore concentration area which is one of the representative ore district. The Baiyangping ore concentration area can be divided into the east and west ore belts, which were formed in a folded tectogene of the India-Asia continental coUisional setting and was controlled by a large reverse fault. Field observations reveal that the Mesozoic and Cenozoic sedimentary strata were outcropped in the mining area, and that the orebodies are obviously controlled by faults and hosted in sandstone and carbonate rocks. However, the oreforming elements in the east ore belt are mainly Pb-Zn -Sr-Ag, while Pb-Zn-Ag-Cu-Co elements are dominant in the west ore belt. Comparative analysis of the C-O-Sr-S-Pb isotopic compositions suggest that both ore belts had a homogeneous carbon source, and the carbon in hydrothermal calcite is derived from the dissolution of carbonate rock strata; the ore- forming fluids were originated from formation water and precipitate water, which belonged to basin brine fluid system; sulfur was from organic thermal chemical sulfate reduction and biological sulfate reduction; the metal mineralization material was from sedimentary strata and basement, but the difference of the material source of the basement and the strata and the superimposed mineralization of the west ore belt resulted in the difference of metallogenic elements between the eastern and western metallogenic belts. The Pb-Zn mineralization age of both ore belts was contemporary and formed in the same metaliogenetic event. Both thrust formed at the same time and occurred at the Early Oligocene, which is consistent with the age constrained by field geological relationship.

Geochemical Characteristics of Gold Polymetallic Deposits as Exemp lified by the Laozuoshan Deposit, Heilongjiang, China

From the studies of ore deposit geologic settings, sulfur i so topes, lead isotopes, carbon isotopes and oxygen isotopes, fluid inclusions and petrochemistry in this paper, the authors have drawn a conclusion that the ore- forming hydrothermal solutions are the high-temperature magmatic hydrothermal s olutions for the gold ore deposit, and at the same time, the involvement of crus tal materials can not be ruled out. It is the first time that the authors have p roposed that the Laozuoshan gold-polymetallic ore deposit in Heilongjiang Prov ince was formed in the calc-alkaline series environment at the margin of an act ive continent.

Source of Ore-Forming Fluid and Material in the Baiyun Gold Deposit, Liaoning Province, NE China: Constraints from H-O-S-Pb Isotopes and in-situ Analyses of Au-Bearing Pyrites

The Baiyun deposit is a large gold deposit at the western end of the Liaoji rift zone in Liaoning Province, which has produced both auriferous quartz-vein type and altered-rock type mineralization. The ore bodies are mainly hosted in schist from the Gaixian Formation of the Liaohe Group. A detailed field geological survey showed that the quartz-vein type gold ore bodies are distributed in the near EW-trending and occur in the extensional tectonic space of schist in the Gaixian Formation, and the altered-rock type gold ore bodies are distributed in the near EW-trending structural belt and occur near in the Gaixian Formation of biotite schist, biotite granulite, marble and the upper footwall of dike. To further elucidate the source of ore-forming fluid and material in the Baiyun gold deposit, the H-O isotopes for quartz, S and Pb isotopes, in-situ trace elements for sulfides from quartz-vein and altered-rock type mineralization were studied. The H-O isotopic δD_(V-SMOW) and δ^(18)O_(H2O) values of the auriferous quartz range were from-88.8‰ to-82.2‰ and-1.95‰ to 4.85‰, respectively, suggests that the ore-forming fluids were mainly magmatic water with minor meteoric water. The distribution ranges of in-situ S isotopic compositions of Au-bearing pyrite in the quartz-vein type and altered-rock type ores were-8.38‰–-10.47‰(with average values of-7.89‰) and 11.38‰– 17.52‰(with average values of 11.55‰), respectively, indicating that the S isotopic compositions of the two ore types were clearly different. The in-situ Pb isotopic ratios changed almost uniformly, which showed that they had the same lead isotopic source. Based on the analysis of S and Pb isotopic compositions, the metallogenic materials in the Baiyun gold deposit were primarily from deep magma, and some wall rock materials may have been mixed in the metallogenic process. Co/Ni diagram shows that most Au-bearing pyrites have magmatic-hydrothermal or sedimentary alteration properties, and Au/As ratios were between 0.001 and 0.828(the average value was 0.07), indicating that the ore-forming fluid in the Baiyun gold deposit may have been deep magma. Combining the geological, trace element, and isotopic data, as well as data from previous studies, we propose that the Baiyun gold deposit is a magmatic-hydrothermal ore deposit.

高频燃烧红外吸收法测定铜铅锌多金属矿中的碳、硫

铜铅锌多金属矿中的碳、硫元素对矿产开采、钢铁冶炼及环境保护等方面有着重要的影响,对碳、硫的准确、快速定量检测至关重要,但未见有对铜铅锌多金属矿中的碳、硫同时测定的研究。将铜铅锌多金属矿中碳、硫含量科学分为C1、C2、S1、S2四段,并分别对样品称样量、助熔剂加入比例及种类等因素进行探究,建立了高频燃烧红外吸收法测定铜铅锌多金属矿中的碳、硫的方法,并通过标准物质验证了方法的准确度、精密度与再现性。结果表明,C1、C2、S1、S2称样量分别为0.200 0、0.100 0、0.100 0、0.100 0 g,助熔剂组合方式为Fe+W=(0.6000+0.6000)、(0.6000+0.6000)、(0.9000+0.6000)、(0.6000+0.600 0) g为最佳实验条件。C1、C2、S1、S2曲线的相关系数分别为0.999 4、0.995 9、0.999 9、0.998 9,测定结果的相对标准偏差(RSD,n=11)分别为1.3%、1.5%、1.3%、1.3%,使用3种不同型号的红外碳硫仪进行对比实验,相对标准偏差(RSD,n=11)为0.56%~6.5%。结果均显示,方法准确、可靠,满足铜铅锌多金属矿中碳、硫的同时、准确快速定量检测的要求。

青海某铜铅锌多金属矿选矿工艺研究

针对青海某铜铅锌多金属矿,进行了不同类型捕收剂对铜铅锌浮选分离影响的试验,重点考察了新型捕收剂4037B、P5100C、QBSC的选别效果。结果表明:P5100C和QBSC更有利于铜、铅分离,在最佳条件下,采用铜快速浮选—铜铅混选—铜铅再磨分离—锌浮选流程,获得铜品位35.56%、铜回收率75.23%的铜精矿;铅品位45.02%、铅回收率71.92%的铅精矿;锌品位41.49%、锌回收率72.58%的锌精矿;含铜20.14%、含铅8.90%、含锌28.38%,铜回收率11.93%、铅回收率6.77%、锌回收率11.81%的混合精矿。全流程铜总回收率97.94%,铅总回收率96.62%,锌总回收率92.64%。

北山成矿带老硐沟金多金属矿床S-Pb-C-O同位素特征及其对矿床成因的约束

老硐沟金多金属矿床是北山成矿带内蒙古段最为典型的金矿床之一,其矿床成因存在较多争议,矿床成矿物质来源方面的研究几近空白。文章基于详细的野外实地调查,选取不同成矿阶段的硫化物和方解石,开展原位S-Pb同位素和C-O同位素测试。研究结果表明,老硐沟金多金属矿床δ34S值为-0.56‰~5.54‰,^(206)Pb/^(204)Pb比值为18.326~18.390,207Pb/^(204)Pb比值为15.563~15.645,^(208)Pb/^(204)Pb比值为38.226~38.390,铅同位素μ值变化范围为9.40~9.55,ω值变化范围为35.77~36.85,方铅矿二阶段模式年龄为232~270 Ma,δ^(13)C值介于-0.04‰~2.93‰之间,表明老硐沟金多金属矿床成矿物质具有岩浆和地层混合来源性质,成矿流体以岩浆来源为主,成矿作用晚期流体中混入了地层变质水。文章从矿床稳定同位素研究方面,结合前人对北山造山带构造演化的认识,提出老硐沟金多金属矿床成因为岩浆热液型。

某低品位铅锌铜多金属硫化矿富集与分离试验研究

云南某低品位铅锌铜多金属硫化矿铅品位0.61%、锌品位3.28%、铜品位0.25%,伴生Au、Ag品位分别为0.09、18.04 g/t。矿石嵌布粒度较细,共生关系复杂。为高效开发利用该低品位矿石,进行了系统的浮选试验。结果表明:矿石采用铜铅混合浮选—铜铅分离—锌浮选工艺处理,获得了铜品位21.97%、铜回收率80.85%、金品位1.60 g/t、银品位189.00 g/t、铅品位1.80%的铜精矿,铅品位76.22%、铅回收率88.72%、金品位0.75 g/t、银品位1433.00 g/t、铜品位1.87%的铅精矿,锌品位52.18%、锌回收率93.03%的锌精矿,主要有价成分铅、锌、铜的分离与富集效果较好,金、银一定程度富集在铜精矿、铅精矿中;铜精矿锌含量偏高与黄铜矿、闪锌矿间的嵌布关系异常密切有关;原矿Au、Ag品位低,且在矿石中分散程度高是造成金银综合回收指标偏低的原因。

江西德兴银山铜铅锌多金属矿床稳定同位素地球化学研究

针对银山铜铅锌多金属矿床进行氢、氧、硫、铅同位素研究,以判定其成矿物质的来源。研究结果表明:δD值为-78.9‰~-28.5‰,平均值为-56.5‰;δ18OV-SMOW值为12.10‰~18.70‰,平均值为16.06‰;δ^(18)O_(H_(2)O)值为0.18‰~11.26‰,平均值为8.24‰;反映了成矿流体是岩浆水和大气降水的混合。δ34S值为-1.04‰~2.71‰,平均值为1.35‰,与矿区赋矿地层张村岩组的硫同位素明显不同,暗示了成矿物质不是直接来自地层,但呈现出明显的幔源硫(-3‰~3‰)特征,与矿区火山-次火山活动有紧密联系。铅同位素206Pb/204Pb=17.890 0~18.319 0,207Pb/204Pb=15.528 0~15.602 5,208Pb/204Pb=38.025 2~38.445 0,表明铅来源为壳幔混源,矿石与岩浆岩具有亲缘性。

滇西百济锑铅锌多金属矿化点黄铁矿微量元素和稀土元素地球化学

利用百济锑铅锌多金属矿化点早期矿化阶段的黄铁矿稀土元素和微量元素组成,推演成矿流体性质和成矿类型.黄铁矿LREE富集、HFSE亏损、变化的Y/Ho、Nb/Ta和Zr/Hf特征,指示该阶段的成矿流体主要是富Cl的流体,并且存在少量富F的流体混入.弱的正Eu异常和弱的负Ce异常特征,指示该阶段的成矿流体属于弱氧化性流体.根据黄铁矿样品总体上具有较高的Co含量(209×10^(-6)~7 610×10^(-6),均值为2 041×10^(-6))、Ni含量(109×10^(-6)~2 550×10^(-6),均值为746×10^(-6)),Co/Ni的变化范围介于0.86~6.83(均值为2.82)之间,推测百济矿化点早阶段形成的黄铁矿-辉钼矿-石英矿物组合是岩浆热液和浅成低温热液共同作用的产物.该研究为完善区域成矿作用提供了依据.

内蒙古东乌旗布尔罕特地区物化探异常特征及找矿远景

内蒙古东乌旗布尔罕特地区位于大兴安岭多金属成矿带的中部,区内发育晚侏罗世及早白垩世两期A型花岗岩侵入上泥盆统安格尔音乌拉组中,具有十分有利的成矿地质条件。本文基于在该区开展的1∶1万土壤地球化学测量和地面1∶1万磁测工作,圈出了3个土壤地球化学甲级异常和2个负磁异常区。土壤地球化学异常主要异常元素为Ag、Pb、Zn及Au等,浓集中心明显,套合良好;地面高精度磁测异常区与化探异常及新发现的银铅锌矿化点高度套合。综合分析布尔罕特地区的成矿地质条件及物化探异常特征,认为该区具有良好的热液型银铅锌多金属矿成矿远景,有望取得找矿突破。

满洲里-克鲁伦成矿带铁锰铅锌等多金属矿成矿规律

满洲里-克鲁伦成矿带于东北亚地区,是重要的多金属矿产资源集中区。通过对成矿带的地理位置和矿产资源的分布状况进行介绍,详细分析了成矿时代的3个主要阶段:新太古代-古元古代、晚古生代和中生代。其中中生代的成矿作用最为强烈。同时,通过探讨成矿带的地质构造特征,包括含矿建造特征、区域构造控矿作用、中生代火山构造以及岩浆侵入活动的控矿作用,总结了区域成矿模式,指出成矿带的金属成矿主要集中于中生代,并且成矿作用表现出多期次、多阶段性的特点。研究结果为理解该地区的成矿作用提供了新的视角,并对未来的地质找矿资源勘查工作提供了科学依据。

浅析新疆若羌县红水沟- 亮剑峡一带铅锌金多金属矿成矿地质特征

新疆若羌县红水沟—亮剑峡地区处于塔里木盆地东南缘、阿尔金山脉西南段,位于若羌县西南约125km处,行政区划属新疆若羌县管辖。文中结合实践对新疆若羌县红水沟-亮剑峡一带铅锌金多金属矿成矿地质特征展开探讨,旨在为区内铅锌金多金属矿找矿工作提供参考。

铜铅锌多金属矿矿物学特征及浮选工艺研究

铜锌矿是我国重要矿产资源,有着很高的开发价值,也为众多行业提供了原材料供应。为提升铜锌矿资源的高效利用,选择了多种分析方法,开展了较为全面的工艺矿物学研究,并且对浮选工艺探究。结合试验结果可知,选择的样品产生一定氧化,尤其是铜氧化程度较高。在该矿山资源中,其矿物种类丰富,拥有多种具有回收价值的金属矿。基于这些研究后,能够明确铜锌矿的矿物学特征,也提出了符合要求的浮选工艺,为铜锌矿资源开发利用提供参考价值。

天水市麦积区石庄下铅锌银多金属矿地质特征及找矿分析

石庄下铅锌银多金属矿位于甘肃省天水市麦积区,地质特征独特且具有较高的找矿潜力。该矿床赋矿地层为中下元古界秦岭岩群、上泥盆统大草滩组,侵入的岩株和岩脉为铅锌银等元素的富集提供了物质来源。同时,区内次级断裂改造地层和岩体结构,为成矿物质运移提供通道。综合分析认为,石庄下铅锌银多金属矿具备寻找岩浆期后热液有关的构造角砾岩型矿产的条件。进一步勘查工作将有助于揭示矿床的位置、规模和成因类型,为未来的开发利用提供重要参考。

广东省阳春市尧垌铜铅锌多金属矿成矿条件浅析

勘查区处于阳春盆地,受吴川-四会深大断裂所控制,区内褶皱和断裂均十分发育,具有较好的区位优势和成矿地质条件,热液活动频繁,物化探异常均有明显异常,在勘查区所在的阳春多金属成矿带,乃至整个粤西地区,中-上泥盆统及下石炭统的碳酸盐层是铅、锌、铜、银、硫、铁矿的主要赋矿层位,在勘查区北东部已发现有石菉大型铜矿、锡山中型锡矿。赋存于这些地层中,其他矿种有铁、铅、锌、钼、金、银、钨、硫等。而勘查区内地层出露最广的正好也是同样的地层,这些成矿有利层位分布广,具有较好的找矿前景。

安徽宁国石柱山铅锌多金属矿床地球化学与找矿潜力研究

安徽宁国地区已发现金、铜、钨、钼、铅锌等矿点,但由于以往地质工作程度低,尚未取得较大的找矿成果。本次工作对宁国石柱山地区开展1∶10000土壤地球化学测量,通过对元素数据的多元统计分析和成矿潜力分析,圈定土壤地球化学单元素异常171个,综合异常3个。根据综合异常特征以及异常找矿潜力的分析,三个综合异常均具有较好的寻找中低温热液充填型铅锌多金属矿床的找矿潜力。最后结合成矿地质条件,对异常实施验证,发现五条脉状铅锌多金属矿(化)体,长度超过1公里的矿体有两条,Pb平均品位3.87%,Zn平均品位1.20%,矿体受控于北东走向、南东倾向的断裂,显示该地区具有寻找断裂控制的铅锌多金属矿床的潜力。

甘肃省西秦岭柴家庄- 太阳寺一带金铅锌矿成矿条件及潜力分析

研究区以往地质工作程度较高,区内铜矿(化)点遍布;从地质特征分析认为该区成矿潜力良好,有形成金铅锌矿多金属矿的有利条件;多期构造及岩浆岩活动,为热液型内生矿产形成,可提供优越的条件,区内已发现金、铅、锌、银、铜、汞、锑、铁等矿床(点)百余处,矿床(点)产于早古生代丹凤群、泥盆纪舒家坝组中,以热液型为主,并受韧、脆性断裂构造控制。本次研究工作针对该区金铅锌矿多金属矿等的成矿条件进行分析,进一步总结了金铅锌矿多金属矿在该地区的成矿潜力。

安徽某难选铜铅锌多金属硫化矿选矿工艺试验研究

安徽某铜铅锌多金属硫化矿属复杂难选多金属硫化矿,铜铅锌矿物嵌布关系复杂,各矿物之间致密共生,粒度极为不均,综合回收难度大。为提高资源整体综合利用率,针对该矿石性质以Z-200为铜捕收剂,25^(#)黑药为铅捕收剂,丁基黄药为锌硫捕收剂,采用铜铅锌硫依次优先浮选工艺流程,在原矿含铜0.58%、铅0.57%、锌2.50%、硫5.39%的条件下,获得了铜精矿Cu品位18.83%、回收率76.33%,铅精矿Pb品位45.83%、回收率68.58%,锌精矿Zn品位50.25%、回收率87.44%,硫精矿S含量40.89%、回收率44.64%的实验室指标。研究结果为下一步工业化生产提供了指导依据。

三维建模与数字化管理在白牛厂银铅锌多金属矿区的应用

白牛厂银铅锌多金属矿位于滇东南薄竹山花岗岩体北西倾没端,矿区从西到东由咪尾、穿心洞、白羊、对门山、阿尾五个矿段组成,银资源达超大型规模,锡、铅、锌资源达大型—超大型规模,同时伴生有丰富的分散元素(铟、镉、镓、锗等);随着地质产业数字化,矿山三维建模实现了地质资料数字化管理、三维可视化应用,笔者通过在矿区近4年的地质工作及以往资料综合整理,建立了地质数据库、三维矿体模型等,并将地表实景三维模型、地下采空区激光雷达扫描模型等多元数据进行配准融合,应用于矿山的信息化管理及深部找矿预测。