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Texture and Geochemistry of Multi-stage Hydrothermal Scheelite in the Mamupu Cu-Au-Mo(-W)Deposit,Eastern Tibet:Implications for Tungsten Mineralization in the Yulong Belt
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作者 ZHANG Xiaoxu TANG Juxing +7 位作者 LIN Bin WANG Qin HE Liang YAN Gang SHAO Rui WU Qiang DU Qiu ZHAXI Pingcuo 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2024年第3期701-716,共16页
Multistage tungsten mineralization was recently discovered in the Mamupu copper-polymetallic deposit in the southern Yulong porphyry copper belt(YPCB),Tibet.This study reports the results of cathodoluminescence,trace ... Multistage tungsten mineralization was recently discovered in the Mamupu copper-polymetallic deposit in the southern Yulong porphyry copper belt(YPCB),Tibet.This study reports the results of cathodoluminescence,trace element and Sr isotope analyses of Mamupu scheelite samples,undertaken in order to better constrain the mechanism of W mineralization and the sources of the ore-forming fluids.Three different types of scheelite are identified in the Mamupu deposit:scheelite A(Sch A)mainly occurs in breccias during the prograde stage,scheelite B(Sch B)forms in the chlorite-epidote alteration zone in the retrograde stage,while scheelite C(Sch C)occurs in distal quartz sulfide veins.The extremely high Mo content and negative Eu anomaly in Sch A represent high oxygen fugacity in the prograde stage.Compared with ore-related porphyries,Sch A has a similar REE pattern,but with higher ΣREE,more depleted HREE and slightly lower(^(87)Sr/^(86)Sr)i ratios.These features suggest that Sch A is genetically related to ore-related porphyries,but extensive interaction with carbonate surrounding rocks affects the final REE and Sr isotopic composition.Sch B shows dark(Sch B-I)and light(Sch B-II)domains under CL imaging.From Sch B-I to Sch B-II,LREEs are gradually depleted,with MREEs being gradually enriched.Sch C has the highest LREE/HREE ratio,which indicates that it inherited the geochemical characteristics of fluids after the precipitation of HREE-rich minerals,such as diopside and garnet,in the early prograde stage.The Mo content in Sch B and Sch C gradually decreased,indicating that the oxygen fugacity of the fluids changed from oxidative in the early stages to reductive in the later,the turbulent Eu anomaly in Sch B and Sch C indicating that the Eu anomaly in the Mamupu scheelite is not solely controlled by oxygen fugacity.The extensive interaction of magmatic-hydrothermal fluids and carbonate provides the necessary Ca^(2+)for the precipitation of scheelite in the Mamupu deposit. 展开更多
关键词 SCHEELITE GEOCHEMISTRY Mamupu cu deposit Yulong porphyry copper belt eastern Tibet
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Trace element compositions of pyrite and stibnite:implications for the genesis of antimony mineralization in the Yangla Cu skarn deposit,Northwestern Yunnan,China
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作者 Ping Pan Xinfu Wang +2 位作者 Bo Li Guo Tang Zuopeng Xiang 《Acta Geochimica》 EI CAS CSCD 2024年第3期535-554,共20页
The Yangla Cu skarn deposit is located in the central part of the Jinshajiang Suture Zone,southwest China,with a total reserve of 150 Mt Cu@1.03%.The newly discovered antimony orebodies at the depth of Yangla are stri... The Yangla Cu skarn deposit is located in the central part of the Jinshajiang Suture Zone,southwest China,with a total reserve of 150 Mt Cu@1.03%.The newly discovered antimony orebodies at the depth of Yangla are strictly controlled by the stratum,structure,and lithology,which are lenticular and vein-like within the marble fracture zone,which can provide a window into multistage miner-alization and ore genesis at Yangla.Mineralization can be divided into three types,Cu–Pb–Zn(skarn)pyrite,galena,and sphalerite,Cu(porphyry)chalcopyrite and pyrite,and Sb(hydrothermal)stibnite and pyrite.The mineral assem-blages were stibnite+pyrite+calcite+quartz±minor scheelite in antimony ores.This study presents quantitative measurements of the trace element compositions of pyrite and stibnite from the Yangla antimony ores.Analysis of pyrite with electron probe microanalysis(EPMA)showed enrichment in Co,Ni,Sb,As,and Mo,and deficit in its S and Fe contents when compared to the stoichiometric con-centrations of S and Fe in pyrite.The Sb-related pyrite may belong to sedimentary-reworked genesis and may be modi-fied by hydrothermalfluids,thereby presenting a certain dif-ference(i.e.,crystal morphology,texture,and chemical com-position)compared to the skarn and porphyry Cu-related pyrite in the Yangla Cu skarn deposit.Analysis of stibnite with EPMA and inductively coupled plasma-mass spectrom-etry showed enrichment in As,Pb,Sn,Pb,Cu,and Zn,and presented much higher Sb contents and slightly lower S con-tents when compared to the stoichiometric concentrations of Sb and S in stibnite.Statistical analysis of the stibnite trace elements showed correlations for the elemental pairs Cu–Pb,As–Sb,and Sn–Pb,and the coupled substitution equations Sb^(3+)↔Cu^(+)+Pb^(2+),Sb^(3+)↔As^(3+),and Sn^(2+)↔Pb^(2+)may be the major factors governed the incorporating Cu,Pb,As and Sn within the stibnite.Moreover,this study preliminary shows that the antimony mineralization may belong to a car-bonate replacement hydrothermal genesis at Yangla. 展开更多
关键词 Trace elements PYRITE STIBNITE Substitution mechanisms Antimony mineralization Yangla cu skarn deposit
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Magmatic-hydrothermal Evolution and Mineralization Mechanisms of the Wangjiazhuang Cu(-Mo)Deposit in the Zouping Volcanic Basin,Shandong Province,China:Constraints from Fluid Inclusions
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作者 SHU Lei YANG Renchao +5 位作者 SHEN Kun YANG Deping MAO Guangzhou LI Min LIU Pengrui MA Xiaodong 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2024年第3期679-700,共22页
The Wangjiazhuang Cu(-Mo)deposit,located within the Zouping volcanic basin in western Shandong Province,China,is unique in this area for having an economic value.In order to expound the metallogenetic characteristics ... The Wangjiazhuang Cu(-Mo)deposit,located within the Zouping volcanic basin in western Shandong Province,China,is unique in this area for having an economic value.In order to expound the metallogenetic characteristics of this porphyry-like hydrothermal deposit,a detailed fluid inclusion study has been conducted,employing the techniques of representative sampling,fluid inclusion petrography,microthermometry,Raman spectroscopy,LA-ICP-MS analysis of single fluid inclusions,as well as cathode fluorescence spectrometer analysis of host mineral quartz.The deposit contains mainly two types of orebodies,i.e.veinlet-dissemination-stockwork orebodies in the K-Si alteration zone and pegmatiticquartz sulfide veins above them.In addition,minor breccia ore occurs locally.Four types of fluid inclusions in the deposit and altered quartz monzonite are identified:L-type one-or two-phase aqueous inclusions,V-type vapor-rich inclusions with V/L ratios greater than 50%-90%,D-type multiphase fluid inclusions containing daughter minerals or solids and S-type silicate-bearing fluid inclusions containing mainly muscovite and biotite.Ore petrography and fluid inclusion study has revealed a three-stage mineralization process,driven by magmatic-hydrothermal fluid activity,as follows.Initially,a hydrothermal fluid,separated from the parent magma,infiltrated into the quartz monzonite,resulting in its extensive K-Si alteration,as indicated by silicate-bearing fluid inclusions trapped in altered quartz monzonite.This is followed by the early mineralization,the formation of quartz veinlets and dissemination-stockwork ores.During the main mineralization stage,due to the participation and mixing of meteoric groundwater with magmatic-sourced hydrothermal fluid,the cooling and phase separation caused deposition of metals from the hydrothermal fluids.As a result,the pegmatitic-quartz sulfide-vein ores formed.In the late mineralization stage,decreasing fluid salinity led to the formation of L-type aqueous inclusions and chalcopyrite-sulfosalt ore.Coexistence of V-type and D-type inclusions and their similar homogenization temperatures with different homogenization modes suggest that phase separation or boiling of the ore-forming fluids took place during the early and the main mineralization stages.The formation P-T conditions of S-type inclusions and the early and the main mineralization stages were estimated as ca.156-182 MPa and 450-650℃,350-450℃,18-35 MPa and 280-380℃,8-15 MPa,respectively,based on the microthermometric data of the fluid inclusions formed at the individual stages. 展开更多
关键词 fluid inclusions fluid immiscibility mineralization mechanisms Wangjiazhuang cu(-Mo)deposit
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Fabrication of Graphene/Cu Composite by Chemical Vapor Deposition and Effects of Graphene Layers on Resultant Electrical Conductivity
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作者 Xinyue Liu Yaling Huang +2 位作者 Yuyao Li Jie Liu Quanfang Chen 《Journal of Harbin Institute of Technology(New Series)》 CAS 2024年第1期16-25,共10页
Graphene(Gr)has unique properties including high electrical conductivity;Thus,graphene/copper(Gr/Cu)composites have attracted increasing attention to replace traditional Cu for electrical applications. However,the pro... Graphene(Gr)has unique properties including high electrical conductivity;Thus,graphene/copper(Gr/Cu)composites have attracted increasing attention to replace traditional Cu for electrical applications. However,the problem of how to control graphene to form desired Gr/Cu composite is not well solved. This paper aims at exploring the best parameters for preparing graphene with different layers on Cu foil by chemical vapor deposition(CVD)method and studying the effects of different layers graphene on Gr/Cu composite’s electrical conductivity. Graphene grown on single-sided and double-sided copper was prepared for Gr/Cu and Gr/Cu/Gr composites. The resultant electrical conductivity of Gr/Cu composites increased with decreasing graphene layers and increasing graphene volume fraction. The Gr/Cu/Gr composite with monolayer graphene owns volume fraction of less than 0.002%,producing the best electrical conductivity up to59.8 ×10^(6)S/m,equivalent to 104.5% IACS and 105.3% pure Cu foil. 展开更多
关键词 chemical vapor deposition(CVD) Gr/cu Gr/cu/Gr graphene layers graphene volume fraction electrical conductivity
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Genesis and metallogenic characteristic of Dongnan Cu–Mo deposit associated granitoids:LA-ICP-MS zircon U–Pb dating and isotope constraint from Zijinshan ore field in southeastern China 被引量:1
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作者 Qifeng Xie Mingguo Zhai +3 位作者 Yuanfeng Cai Yunpeng Dong Hong Zhang Aifang Xiao 《Acta Geochimica》 EI CAS CSCD 2023年第2期332-345,共14页
The Dongnan Cu–Mo deposit,located in the southeast of the Zijinshan ore field(the largest porphyry–epithermal system in Southeast China),represents the complex magmatic and metallogenesis events in the region.The pe... The Dongnan Cu–Mo deposit,located in the southeast of the Zijinshan ore field(the largest porphyry–epithermal system in Southeast China),represents the complex magmatic and metallogenesis events in the region.The petrogenesis and metallogenesis of granitoids from the deposit are not determined,especially the interactions between ore-bearing(granodiorite porphyry)and barren samples(granodiorite and diorite).In the paper,the whole rock geochemical features shared a similar affinity to the middle-lower content and revealed that they derived from partial melting of the Cathaysian basement with the contribution of mantle materials,even represented that they generated in the plate subduction;LA-ICP-MS zircon U–Pb ages show that these granodiorites,granodioritic porphyry and diorite,were generated during 114–103 Ma.The ore-bearing samples mostly presented ε_(Hf)(t)of negative values(peak value is-4 to-3)with old two-stage Hf model ages(t_(DM)^(2))(peak value is 1.10–1.15 Ga),while the barren sample showed slightly negative ε_(Hf)(t)(peak value is-1 to 0)values with young t_(DM)^(2)(peak value is 1.00–1.05 Ga).The value of zircon Ce^(4+)/Ce^(3+)ratio mostly higher than 450 was first verified for the ore-bearing samples in the Dongnan Cu–Mo deposit,and the values of ore-bearing were found to be higher than those from the barren,which suggests that the ore-bearing formed in more oxidized parental magma with higher oxygen fugacity.Based on the geochemical characteristic of the element and isotope,we concluded that the Early Cretaceous multiphases magmatic activities,low melting temperature and low pressure of pluton,and high oxygen fugacity of zircon,were the favorable conditions for metallogenesis of Dongnan Cu–Mo deposit. 展开更多
关键词 Magmatism METALLOGENESIS Dongnan cu–Mo deposit Zijinshan ore field
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Textural and compositional variation of mica from the Dexing porphyry Cu deposit:constraints on the behavior of halogens in porphyry systems
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作者 Yan Liu Jian-Feng Gao +1 位作者 Liang Qi Kang Min 《Acta Geochimica》 EI CAS CSCD 2023年第2期221-240,共20页
The Dexing porphyry deposit is the largest porphyry Cu–Mo–Au deposit in South China.Biotite composition can record the physicochemical conditions and evolution history of magmatic-hydrothermal system.Biotite from th... The Dexing porphyry deposit is the largest porphyry Cu–Mo–Au deposit in South China.Biotite composition can record the physicochemical conditions and evolution history of magmatic-hydrothermal system.Biotite from the Dexing porphyry deposit could be divided to three types:primary magmatic biotite(Bi-M),hydrothermal altered magmatic biotite(Bi-A)and hydrothermal biotite(Bi-H).The temperature of Bi-M and Bi-H range from 719 to 767℃ and 690 to 727℃,respectively.Both magmatic and hydrothermal biotite have high Fe^(3+)/Fe^(2+)ratios(from 0.18 to 0.24)and XMgvalues(from 0.57 to 0.66),indicating a high oxygen fugacity.BiM has F lower than Bi-A and Bi-H(up to 0.26 wt%),but has Cl(Cl=0.18–0.30 wt%)similar to Bi-A and Bi-H(Cl=0.21–0.35 wt%),suggesting that high Cl/F ratios of early hydrothermal fluid may result from the exsolution from high Cl magma.From potassic alteration zone to phyllic and propylitic alteration zones,Cl decreases with increasing Cu,whereas F increases roughly.Therefore,Cl mostly originate from magma,but enrichment of F possibly results from reaction of fluids and Neoproterozoic strata.Negative correlation between Cl and Cu indicates that Cl might act as an important catalyst during Cu mineralization process.Biotite from Dexing has similar halogen compositions to other porphyry Cu-/Mo deposits in the world.Chlorine contents of hydrothermal fluid may be critical for Cu transportation and enrichment,while consumption of Cl would promote Cu deposition. 展开更多
关键词 HALOGEN Dexing porphyry deposit BIOTITE GEOCHEMISTRY Porphyry cu deposit
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滇西保山地块金厂河Fe-Cu-Pb-Zn矽卡岩型多金属矿床黑柱石成因及地质意义
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作者 陆波德 刘学龙 +8 位作者 周云满 赵成峰 王基元 李方兰 李庆锐 王海 李守奎 曹振梁 周杰虎 《地质学报》 EI CAS CSCD 北大核心 2024年第4期1164-1182,共19页
黑柱石是一种矽卡岩型铅锌及铁矿床中少见的矿物,与铅锌矿体、磁铁矿体关系密切。为查明黑柱石成矿过程中与铅锌铁铜多金属成矿作用的关系,本文对金厂河Fe-Cu-Pb-Zn多金属矿床中的黑柱石产状、矿物共生组合、化学成分、分带性等开展了... 黑柱石是一种矽卡岩型铅锌及铁矿床中少见的矿物,与铅锌矿体、磁铁矿体关系密切。为查明黑柱石成矿过程中与铅锌铁铜多金属成矿作用的关系,本文对金厂河Fe-Cu-Pb-Zn多金属矿床中的黑柱石产状、矿物共生组合、化学成分、分带性等开展了研究。根据电子探针数据计算可得,金厂河矿区黑柱石的化学式为:Ca_(0.95-1.08)(Fe_(0.87-1.97)Mn_(0.08-0.36)Mg_(0.01-0.06))^(2+)_((1.89-2.03))(Fe_(0.82-1.04)Al_(0.01-0.03))^(3+)_((0.88-1.15))[Si_(1.94-2.08)O_(7)]O(OH)。结合矿物组合类型、产状、分带特征等,推测矿床内矽卡岩由内带逐渐向外带交代的趋势。金厂河矿区主要有3种矿物共生组合:黑柱石+磁铁矿组合,黑柱石+磁铁矿+黄铁矿+黄铜矿组合,黑柱石+方铅矿+闪锌矿+黄铜矿组合,分别对应三个不同的蚀变阶段:晚期矽卡岩阶段(代表组合Ⅰ),以石榴子石的分解为主,形成大量的黑柱石;退蚀变阶段(代表组合Ⅱ),以阳起石、黄铜矿、黄铁矿发育为主;石英-硫化物阶段(代表组合Ⅲ),以发育大量的方铅矿、闪锌矿为主,同时这一阶段内黑柱石分解,形成阳起石、方解石、磁铁矿等。此外,黑柱石的稀土元素配分模式与石榴子石的类似,一定程度上保留了石榴子石的稀土元素特征。研究认为:黑柱石是早期石榴子石退化分解的产物,矿床自内向外逐渐交代,形成了铅锌铜矿体中以锰质黑柱石为主,而磁铁矿体、铜矿体中以含锰黑柱石为主的分带特性。锰质黑柱石有利于铅锌矿的形成,而对于磁铁矿有贫化的影响,同时也可为矿区揭露中酸性岩体和深部找矿提供重要科学意义。 展开更多
关键词 电子探针 LA-ICP-MS原位微区 黑柱石 Fe-cu-Pb-Zn多金属矿 金厂河
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超音速激光沉积Cu-Al_(2)O_(3)-石墨复合涂层微观结构及耐磨损性能
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作者 孙启帆 林钟卫 +3 位作者 刘博 章钢 李波 姚建华 《表面技术》 EI CAS CSCD 北大核心 2024年第5期115-125,共11页
目的研究不同石墨含量对超音速激光沉积Cu-Al_(2)O_(3)-石墨复合涂层的微观组织、显微硬度、耐磨损性能的影响。方法利用扫描电子显微镜、能量色谱仪、维氏硬度计、激光共聚焦扫描显微系统、X射线衍射仪、摩擦磨损测试对复合涂层的微观... 目的研究不同石墨含量对超音速激光沉积Cu-Al_(2)O_(3)-石墨复合涂层的微观组织、显微硬度、耐磨损性能的影响。方法利用扫描电子显微镜、能量色谱仪、维氏硬度计、激光共聚焦扫描显微系统、X射线衍射仪、摩擦磨损测试对复合涂层的微观组织、显微硬度、耐磨损性能及磨损机制进行分析。结果随着原始粉末中镀铜石墨质量占比的增加,Cu-Al_(2)O_(3)-石墨复合涂层的沉积效率逐渐降低。基于Al_(2)O_(3)颗粒的原位喷丸效应及激光辐照的加热软化效应,复合涂层具有致密的微观组织,且复合涂层与基体界面结合良好。单一添加Al_(2)O_(3)颗粒可以将Cu涂层的硬度从108.19HV0.2提高至121.82HV0.2。随着石墨含量的增大,涂层的显微硬度逐渐降低,镀铜石墨在原始粉末中的质量分数从5%增至15%,Cu-Al_(2)O_(3)-石墨复合涂层的硬度从116.09HV0.2降至94.17HV0.2。添加石墨能够在复合涂层表面形成固体润滑层,降低复合涂层的摩擦因数,提升涂层的耐磨损性能。CuAlGr10复合涂层具有最优的耐磨损性能,磨损率为0.7×10^(−4)mm^(3)/(N·m)。此外,由于激光辐照促进了复合涂层内部颗粒间的界面结合,均匀分散在石墨润滑相中的Al_(2)O_(3)颗粒作为负载支撑和耐磨相,可进一步降低复合涂层的磨损率。结论Cu-Al_(2)O_(3)-石墨复合涂层优异的耐磨性能是润滑相石墨颗粒和硬质增强相Al_(2)O_(3)颗粒共同作用的结果,石墨的添加能够降低复合涂层的摩擦因数,提升涂层的耐磨损性能,但过量的石墨颗粒会对涂层产生割裂作用,导致增强相Al_(2)O_(3)颗粒脱离涂层,从而加剧涂层的磨损。 展开更多
关键词 超音速激光沉积 cu-Al_(2)O_(3)-石墨复合涂层 微观组织 显微硬度 耐磨损性能 磨损机制
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镁铁质岩浆周期性补给对云南普朗斑岩Cu-Au矿床的制约:能量约束下热力学模拟
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作者 张少颖 和文言 肖仪武 《现代地质》 CAS CSCD 北大核心 2024年第4期922-933,共12页
镁铁质岩浆周期性补给于硅酸质岩浆房是形成大型斑岩矿床的关键因素。本文以普朗超大型斑岩Cu-Au矿床为例,通过能量约束体系下的热力学方法模拟浅部硅酸质岩浆房中镁铁质岩浆周期性补给过程,定量评估该过程对形成大型斑岩矿床的控制作... 镁铁质岩浆周期性补给于硅酸质岩浆房是形成大型斑岩矿床的关键因素。本文以普朗超大型斑岩Cu-Au矿床为例,通过能量约束体系下的热力学方法模拟浅部硅酸质岩浆房中镁铁质岩浆周期性补给过程,定量评估该过程对形成大型斑岩矿床的控制作用。普朗矿床成矿前粗粒石英闪长玢岩(CQD)和成矿期石英二长斑岩(QMP)复式岩体中均普遍发育镁铁质暗色微粒包体(MMEs),岩相学特征显示斑岩体中角闪石和黑云母发育韵律环带结构或港湾状溶蚀结构以及针柱状磷灰石的存在均指示发生了镁铁质岩浆混合作用。与单一的分离结晶模型(FC)相比,多阶段岩浆补给-分离结晶模型(R3FC)显示,镁铁质岩浆的补给一方面会抑制长石的结晶,另一方面会促进钙铁镁和铁镁等多类型角闪石的形成,并大幅提前黑云母的结晶次序。以硅酸质岩浆物质摩尔分数变化与挥发分之间相关性为参照,获得的熔体H_(2) O、SCSS(硫化物饱和时硅酸盐熔体中的S含量)和Cl溶解度显示,镁铁质岩浆补给将在岩浆演化早期提高而在晚期降低残余熔体H_(2)O含量(0.16%、0.04%、-0.30%),持续提高熔体SCSS(78.74×10^(-6)、94.44×10^(-6)和137.88×10^(-6))和Cl溶解度(0.04%、0.10%和0.20%),但对Cu含量影响有限。结果表明,能量约束体系下的R3FC和FC热力学模型不仅能够合理解释普朗复式斑岩体矿物结构特征,也定量验证了镁铁质岩浆的补给对成矿岩体异常高H_(2) O、S和Cl含量的贡献。 展开更多
关键词 岩浆混合 热力学模拟 挥发分 普朗斑岩cu-Au矿床
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Structure of Cu-Phthalocyanine Vacuum Deposited on Inclined Glass Substrates
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作者 Masato Ohmukai Yasutaka Kato 《World Journal of Engineering and Technology》 2023年第4期770-774,共5页
Cu-phthalocyanine is widely studied as a hole-transport layer in organic electronic devices. Since Cu-phthalocyanine is a molecular solid, the crystal structure depends on a circumstance to a great extent. Vacuum depo... Cu-phthalocyanine is widely studied as a hole-transport layer in organic electronic devices. Since Cu-phthalocyanine is a molecular solid, the crystal structure depends on a circumstance to a great extent. Vacuum deposited layers were known to consist of two consecutive layers. In this article, Cu-phthalocyanine was deposited on the glass substrate inclined at several angles. The thickness of the first layer was found to be dependent on the substrate angle. 展开更多
关键词 cu-Phthalocyanine Vacuum deposition Crystal Structure Inclined Substrate
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甘肃金川超大型Ni-Cu-PGE硫化物矿床岩浆通道分枝构造及其深部找矿意义 被引量:4
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作者 宋谢炎 康健 +5 位作者 隆廷茂 李晓栋 王永才 李德贤 艾启兴 卢建全 《地球科学与环境学报》 CAS 北大核心 2023年第5期1049-1062,共14页
甘肃金川超大型Ni-Cu-PGE硫化物矿床经过50多年的开采,在深边部寻找新的矿体,特别是富矿,以保持生产效率,已经成为当务之急,首先需要解决找矿方向问题。金川矿床的4个主要矿体不仅在空间上是相互独立的,空间分布格局还与矿区的成矿后断... 甘肃金川超大型Ni-Cu-PGE硫化物矿床经过50多年的开采,在深边部寻找新的矿体,特别是富矿,以保持生产效率,已经成为当务之急,首先需要解决找矿方向问题。金川矿床的4个主要矿体不仅在空间上是相互独立的,空间分布格局还与矿区的成矿后断裂系统关系密切。在前人对各个主要矿体地质和地球化学特征、矿区断裂构造的系统分析和研究基础上,提出金川矿床的岩浆通道系统存在多个岩浆通道分枝,且每个分枝的启动时间不同,因此,每个矿体不仅成矿过程存在差异,也存在先后次序。在分析成矿后断裂对金川岩体和矿体空间分布状态的影响基础上,还对深部找矿潜力进行了分析,提出了深部找矿方向和策略。 展开更多
关键词 小岩体成大矿 Ni-cu-PGE硫化物矿床 岩浆通道分枝 成矿后断裂 深部找矿 甘肃
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多期构造变形事件对吉林南部大横路Cu-Co矿床富集成矿的制约 被引量:3
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作者 田忠华 刘福来 +2 位作者 刘超辉 朱志勇 王慧宁 《地质学报》 EI CAS CSCD 北大核心 2023年第11期3673-3695,共23页
钴矿是重要的战略性金属矿产资源之一,对其成矿作用(如构造与成矿的关系)进行深入的研究能为前期指导找矿提供理论依据。本文对中国东部吉林白山市三道沟镇三岔河村大横路Cu-Co矿开展了相关工作,包括野外构造解析、钻孔-岩芯资料分析、... 钴矿是重要的战略性金属矿产资源之一,对其成矿作用(如构造与成矿的关系)进行深入的研究能为前期指导找矿提供理论依据。本文对中国东部吉林白山市三道沟镇三岔河村大横路Cu-Co矿开展了相关工作,包括野外构造解析、钻孔-岩芯资料分析、钻孔薄片综合矿物分析系统(TIMA)实验和区域相关岩石年代学等。构造解析显示大横路Cu-Co矿围岩变形包括层片交切、S_(1)面理和褶劈理等构造要素。钻孔-岩芯资料分析矿区发育大量F_(2)紧闭褶皱、逆冲断层及断层相关褶皱、倒转褶皱F_(2)等。钻孔、探槽薄片样品TIMA实验显示含Co流体大量富集于低角度逆冲断裂、倒转褶皱韧性剪切域和断层相关褶皱转折端处。这些工作显示走向为NE的低角度逆冲断裂及断层相关褶皱对大横路Cu-Co矿的富集起到关键的控制作用。相关年代学工作,结合前人研究及大量区域地质资料表明:(1)矿区内逆冲断层及褶皱等控矿构造要素为古元古代构造事件的产物;(2)中生代构造事件对成矿作用的制约(Cu-Co矿的再富集)可能来自于白垩纪大规模的伸展作用。 展开更多
关键词 战略性金属矿产Co 构造与成矿 多期构造事件 大横路cu-Co矿 胶-辽-吉造山带
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土壤与大气Cu处理下迎春的耐性和富集特征研究
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作者 王天琪 徐瑞瑞 +3 位作者 侯立娜 阮坤非 毕宁宁 刘忠华 《广西植物》 CAS CSCD 北大核心 2023年第9期1656-1667,共12页
作为北京市常见园林灌木树种之一,迎春(Jasminum nudiflorum)因其在早春独特的观赏性而深受市民喜爱。Cu污染是北京市较为严重的重金属污染类型之一。为探讨迎春对城市Cu污染的修复作用,该文通过模拟北京市土壤和大气Cu污染条件,采用盆... 作为北京市常见园林灌木树种之一,迎春(Jasminum nudiflorum)因其在早春独特的观赏性而深受市民喜爱。Cu污染是北京市较为严重的重金属污染类型之一。为探讨迎春对城市Cu污染的修复作用,该文通过模拟北京市土壤和大气Cu污染条件,采用盆栽试验,设置9种不同浓度的土壤和大气Cu处理,以验证迎春Cu富集能力及生理生长特性。结果表明:(1)土壤和大气沉降处理均能显著增加迎春根、茎、叶中的Cu含量,其中土壤贡献率为63.48%~96.99%。各处理中Cu含量均表现为根>茎>叶。(2)大气处理下光化学转化效率(F_v/F_m)和相对叶绿素含量(SPAD值)提高,初始荧光(F_0)降低,光合能力增强,而土壤处理及土壤和大气双重处理则对迎春的光合作用产生抑制影响。(3)与大气处理相比,土壤处理及土壤和大气双重处理导致活性氧(ROS)积累增多,膜脂过氧化作用加剧,丙二醛(MDA)含量大幅升高,抗氧化酶活性与脯氨酸(PRO)含量逐渐下降,造成生物膜系统损伤。(4)低浓度Cu处理对迎春生长有促进作用,而高浓度Cu处理(SHAL、SHAH)则抑制迎春生长,迎春根系耐性指数(TI)最小值为69.19%,属于高耐受型植物。综上认为,在模拟北京市Cu污染处理下,迎春可以在维持自身正常生理生长活动的同时,有效吸收土壤和大气中的Cu。该研究结果为北京市Cu污染防治、生态环境修复提供一定的理论依据。 展开更多
关键词 cu处理 迎春 土壤和大气沉降处理 耐性 富集
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3D geological modeling for mineral resource assessment of the Tongshan Cu deposit,Heilongjiang Province,China 被引量:28
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作者 Gongwen Wang Lei Huang 《Geoscience Frontiers》 SCIE CAS 2012年第4期483-491,共9页
Three-dimensional geological modeling (3DGM) assists geologists to quantitatively study in three-dimensional (3D) space structures that define temporal and spatial relationships between geological objects. The 3D ... Three-dimensional geological modeling (3DGM) assists geologists to quantitatively study in three-dimensional (3D) space structures that define temporal and spatial relationships between geological objects. The 3D property model can also be used to infer or deduce causes of geological objects. 3DGM technology provides technical support for extraction of diverse geoscience information, 3D modeling, and quantitative calculation of mineral resources. Based on metallogenic concepts and an ore deposit model, 3DGM technology is applied to analyze geological characteristics of the Tongshan Cu deposit in order to define a metallogenic model and develop a virtual borehole technology; a BP neural network and a 3D interpolation technique were combined to integrate multiple geoscience information in a 3D environment. The results indicate: (1) on basis of the concept of magmatic-hydrothermal Cu polymetallic mineraliza- tion and a porphyry Cu deposit model, a spatial relational database of multiple geoscience information for mineralization in the study area (geology, geophysics, geochemistry, borehole, and cross-section data) was established, and 3D metallogenic geological objects including mineralization stratum, granodiorite, alteration rock, and magnetic anomaly were constructed; (2) on basis of the 3D ore deposit model, 23,800 effective surveys from 94 boreholes and 21 sections were applied to establish 3D orebody models with a kriging interpolation method; (3) combined 23,800 surveys involving 21 sections, using VC++ and OpenGL platform, virtual borehole and virtual section with BP network, and an improved inverse distance interpolation (IDW) method were used to predict and delineate mineralization potential targets (Cu-grade of cell not less than 0.1%); (4) comparison of 3D ore bodies, metallogenic geological objects of mineralization, and potential targets of mineralization models in the study area, delineated the 3D spatial and temporal relationship and causal processes among the ore bodies, alteration rock, metallo- genic stratum, intrusive rock, and the Tongshan Fault. This study provides important technical support and a scientific basis for assessment of the Tongshan Cu deposit and surrounding exploration and mineral resources. 展开更多
关键词 Three-dimensional geological modeling (3DGM) Virtual borehole Virtual section BP network INTERPOLATION Tongshan cu deposit
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Trace Element Geochemistry of Magnetite from the Fe(-Cu) Deposits in the Hami Region, Eastern Tianshan Orogenic Belt, NW China 被引量:18
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作者 HUANG Xiaowen QI Liang MENG Yumiao 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第1期176-195,共20页
Laser ablation–inductively coupled plasma–mass spectrometry(LA–ICP–MS) was used to determine the trace element concentrations of magnetite from the Heifengshan, Shuangfengshan, and Shaquanzi Fe(–Cu) deposits ... Laser ablation–inductively coupled plasma–mass spectrometry(LA–ICP–MS) was used to determine the trace element concentrations of magnetite from the Heifengshan, Shuangfengshan, and Shaquanzi Fe(–Cu) deposits in the Eastern Tianshan Orogenic Belt. The magnetite from these deposits typically contains detectable Mg, Al, Ti, V, Cr, Mn, Co, Ni, Zn and Ga. The trace element contents in magnetite generally vary less than one order of magnitude. The subtle variations of trace element concentrations within a magnetite grain and between the magnetite grains in the same sample probably indicate local inhomogeneity of ore–forming fluids. The variations of Co in magnetite between samples are probably due to the mineral proportion of magnetite and pyrite. Factor analysis has discriminated three types of magnetite: Ni–Mn–V–Ti(Factor 1), Mg–Al–Zn(Factor 2), and Ga– Co(Factor 3) magnetite. Magnetite from the Heifengshan and Shuangfengshan Fe deposits has similar normalized trace element spider patterns and cannot be discriminated according to these factors. However, magnetite from the Shaquanzi Fe–Cu deposit has affinity to Factor 2 with lower Mg and Al but higher Zn concentrations, indicating that the ore–forming fluids responsible for the Fe–Cu deposit are different from those for Fe deposits. Chemical composition of magnetite indicates that magnetite from these Fe(–Cu) deposits was formed by hydrothermal processes rather than magmatic differentiation. The formation of these Fe(–Cu) deposits may be related to felsic magmatism. 展开更多
关键词 trace elements MAGNETITE LA–ICP–MS Fe(–cu deposits Eastern Tianshan Orogenic Belt Xinjiang
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Ore Genesis of the Kalatongke Cu-Ni Sulfide Deposits, Western China: Constraints from Volatile Chemical and Carbon Isotopic Compositions 被引量:11
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作者 FU Piaoer TANG Qingyan +3 位作者 ZHANG Mmgjie ZHANG Zhaowei LI Liwu LI Wenyuan 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2012年第3期568-578,共11页
The Kalatongke Cu-Ni sulfide deposits located in the East Junggar terrane, northern Xinjiang, western China are the largest magmatic sulfide deposits in the Central Asian Orogenic Belt (CAOB). The chemical and carbo... The Kalatongke Cu-Ni sulfide deposits located in the East Junggar terrane, northern Xinjiang, western China are the largest magmatic sulfide deposits in the Central Asian Orogenic Belt (CAOB). The chemical and carbon isotopic compositions of the volatiles trapped in olivine, pyroxene and sulfide mineral separates were analyzed by vacuum stepwise-heating mass spectrometry. The results show that the released volatiles are concentrated at three temperature intervals of 200-400°C, 400-900°C and 900-1200°C. The released volatiles from silicate mineral separates at 400-900°C and 900-1200°C have similar chemical and carbon isotopic compositions, which are mainly composed of H2O (av. ~92 mol%) with minor H2, CO2, H2S and SO2, and they are likely associated with the ore-forming magmatic volatiles. Light δ13CCO2 values (from -20.86‰ to -12.85‰) of pyroxene indicate crustal contamination occurred prior to or synchronous with pyroxene crystallization of mantlederived ore-forming magma. The elevated contents of H2 and H2O in the olivine and pyroxene suggest a deep mantle-originated ore-forming volatile mixed with aqueous volatiles from recycled subducted slab. High contents of CO2 in the ore-forming magma volatiles led to an increase in oxygen fugacity, and thereby reduced the solubility of sulfur in the magma, then triggered sulfur saturation followed by sulfide melt segregation; CO2 contents correlated with Cu contents in the whole rocks suggest that a supercritical state of CO2 in the ore-forming magma system under high temperature and pressure conditions might play a key role in the assemblage of huge Cu and Ni elements. The volatiles released from constituent minerals of intrusion 1# have more CO2 and SO2 oxidized gases, higher CO2/CH4 and SO2/H2S ratios and lighter δ13CCO2 than those of intrusions 2# and 3#. This combination suggests that the higher oxidation state of the volatiles in intrusion 1# than intrusions 2# and 3#, which could be one of key ore-forming factors for large amounts of ores and high contents of Cu and Ni in intrusion 1#. The volatiles released at 200-400°C are dominated by H2O with minor CO2, N2+CO and SO2, with δ13CCO2 values (-25.66‰ to -22.98‰) within the crustal ranges, and are considered to be related to secondary tectonic-hydrothermal activities. 展开更多
关键词 Ore genesis chemical composition carbon isotope VOLATILE mafic–ultramafic intrusion Kalatongke cu–Ni sulfide deposits Xinjiang
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EFFECT OF Ar PRESSURE ON STRUCTURAL AND ELECTRICAL PROPERTIES OF Cu FILMS DEPOSITED ON GLASS BY DC MAGNETRON SPUTTERING 被引量:4
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作者 P. Wu F.P. Wang +2 位作者 L.Q. Pan Y. Tian H. Qiu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2002年第1期39-44,共6页
Cu films with thickness of 630-1300nm were deposited on glass substrates without heating by DC magnetron sputtering in pure Ar gas. Ar pressure was controlled to 0.5, 1.0 and 1.5Pa respectively. The target voltage was... Cu films with thickness of 630-1300nm were deposited on glass substrates without heating by DC magnetron sputtering in pure Ar gas. Ar pressure was controlled to 0.5, 1.0 and 1.5Pa respectively. The target voltage was fixed at 500V but the target current increased from 200 to 1150mA with Ar pressure increasing. X-ray diffraction, scanning electron microscopy and atomic force microscopy were used to observe the structural characterization of the films. The resistivity of the films was measured using four-point probe technique. At all the Ar pressures, the Cu films have mixture crystalline orientations of [111], [200] and [220] in the direction of the film growth. The film deposited at lower pressure shows more [111] orientation while that deposited at higher pressure has more [220] orientation. The amount of larger grains in the film prepared at 0.5Pa Ar pressure is slightly less than that prepared at 1.0Pa and 1.5Pa Ar pressures. The resistivities of the films prepared at three different Ar pressures represent few differences, about 3-4 times of that of bulk material. Besides the deposition rate increases with Ar pressure because of the increase in target current. The contribution of the bombardment of energetic reflected Argon atoms to these phenomena is discussed. 展开更多
关键词 cu film DC magnetron sputtering deposition Ar pressure structure reststivity
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Fluid Inclusion and Carbon-Oxygen Isotope Studies of the Hujiayu Cu Deposit,Zhongtiao Mountains,China:Implications for Synmetamorphic Copper Remobilization 被引量:2
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作者 QIU Zhengjie FAN Hongrui +5 位作者 LIU Xuan WEN Bojie HU Fangfang YANG Kuifeng GUO Shuanglong ZHAO Fengchun 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第3期726-745,共20页
The Hujiayu Cu deposit,representative of the "HuBi-type" Cu deposits in the Zhongtiao Mountains district in the southern edge of the North China Craton,is primarily hosted in graphitebearing schists and carbonate ro... The Hujiayu Cu deposit,representative of the "HuBi-type" Cu deposits in the Zhongtiao Mountains district in the southern edge of the North China Craton,is primarily hosted in graphitebearing schists and carbonate rocks.The ore minerals comprise mainly chalcopyrite,with minor sphalerite,siegenite[(Co,Ni)_3S_4],and clausthalite[Pb(S,Se)].The gangue minerals are mainly quartz and dolomite,with minor albite.Four fluid inclusion types were recognized in the chalcopyrite-pyrite-dolomite-quartz veins,including CO_2-rich inclusions(type Ⅰ),low-salinity,liquid-dominated,biphase aqueous inclusions(type Ⅱ),solid-bearing aqueous inclusions(type Ⅲ),and solid-bearing aqueous-carbonic inclusions(type Ⅳ).Type I inclusion can be further divided into two sub-types,i.e.,monophase CO_2 inclusions(type Ⅰa) and biphase CO_2-rich inclusions(with a visible aqueous phase),and type Ⅲ inclusion is divided into a subtype with a halite daughter mineral(type Ⅲa) and a subtype with multiple solids(type Ⅲb).Various fluid inclusion assemblages(FIAs) were identified through petrographic observations,and were classified into four groups.The group-1 FIA,consisting of monophase CO_2 inclusions(type Ⅰa),homogenized into the liquid phase in a large range of temperatures from-1 to 28℃,suggesting post-entrapment modification.The group-2 FIA consists of type Ⅰb,Ⅲb and Ⅳ inclusions,and is interpreted to reflect fluid immiscibility.The group-3 FIA comprises type Ⅱ and Ⅲa inclusions,and the group-4FIA consists of type Ⅱ inclusions with consistent phase ratios.The group-1 and group-2 FIAs are interpreted to be entrapped during mineralization,whereas group-3 and group-4 FIAs probably represent the post-mineralization fluids.The solid CO_2 melting temperatures range from-60.6 to56.6℃ and from-66.0 to-63.4℃ for type Ⅰa and type Ⅳ inclusions,respectively.The homogenization temperatures for type Ⅱ inclusions range from 132 to 170℃ for group-3 FIAs and115 to 219℃ for group-4 FIAs.The halite melting temperatures range from 530 to 562℃ for typeⅢ b and Ⅳ inclusions,whereas those for type Ⅲa inclusions range from 198 to 398℃.Laser Raman and SEM-EDS results show that the gas species in fluid inclusions are mainly CO_2 with minor CH_4,and the solids are dominated by calcite and halite.The calcite in the hosting marble and dolomite in the hydrothermal veins have δ^(13)C_(V-pdb) values of-0.2 to 1.2‰ and-1.2 to-6.3‰,and δ^(18)O_(v-smow) values of 14.0 to 20.8 ‰ and 13.2 to 14.3‰,respectively.The fluid inclusion and carbon-oxygen isotope data suggest that the ore-forming fluids were probably derived from metamorphic fluids,which had reacted with organic matter in sedimentary rocks or graphite and undergone phase separation at 1.4-1.8 kbar and 230-240℃,after peak metamorphism.It is proposed that the Hujiayu Cu deposit consists of two mineralization stages.The early stage mineralization,characterized by disseminated and veinlet copper sulfides,probably took place in an environment similar to sediment-hosted stratiform copper mineralization.Ore minerals formed in this precursor mineralization stage were remobilized and enriched in the late metamorphic hydrothermal stage,leading to the formation of thick quartz-dolomite-sulfides veins. 展开更多
关键词 Fluid inclusion assemblage carbon-oxygen isotope syn-metamorphic cu deposit Hujiayu cu deposit Zhongtiao Mountains
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Contrast in Fluid M etallogeny between the Tianmashan Au-S Deposit and the Datuanshan Cu Deposit in Tongling,Anhui Province 被引量:2
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作者 LEE Hyun Koo 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2003年第1期116-124,共9页
A comprehensive contrast of ore-forming geological background and ore-forming fluid features, especially fluid ore-forming processes, has been performed between the Tianmashan and the Datuanshan ore deposits in Tongli... A comprehensive contrast of ore-forming geological background and ore-forming fluid features, especially fluid ore-forming processes, has been performed between the Tianmashan and the Datuanshan ore deposits in Tongling, Anhui Province. The major reasons for the formation of the stratabound skarn Au-S ore deposit in Tianmashan and the stratabound skarn Cu ore deposit in Datuanshan are analyzed in accordance with this contrast. The magmatic pluton in Tianmashan is rich in Au and poor in Cu, but that in Datuanshan is rich in Cu and Au. The wallrock strata in Tianmashan contain Au-bearing pyrite layers with some organic substance but those in Datuanshan contain no such layers. Moreover, the ore-forming fluids in Tianmashan are dominantly magmatic ones at the oxide and sulfide stages, but those with high content of Cu in Datuanshan are mainly groundwater fluids. In addition, differences in compositional evolution and physicochemical condition variation of the ore-forming fluids result in gradual dispersion 展开更多
关键词 fluid inclusion fluid ore-forming process contrast in fluid metallogeny Au-S ore deposit cu ore deposit magmatic fluid groundwater fluid TONGLING Anhui Province
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Chemical compositions of sulfides in the porphyry Cu ores,Yangla Cu deposit,Yunnan,China:implication for ore genesis 被引量:5
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作者 Xinfu Wang Bo Li +2 位作者 Zuopeng Xiang Yan Yue Guo Tang 《Acta Geochimica》 EI CAS CSCD 2020年第6期947-972,共26页
The Yangla Cu deposit is the largest ore deposit in the Jinshajiang polymetallic metallogenic belt,northwest Yunnan,China.There is no consensus on the genesis of the ore deposit owing to the limited studies on the che... The Yangla Cu deposit is the largest ore deposit in the Jinshajiang polymetallic metallogenic belt,northwest Yunnan,China.There is no consensus on the genesis of the ore deposit owing to the limited studies on the chemical compositions of sulfides.This study used an electron probe micro-analyzer to constrain the chemical compositions of pyrite,chalcopyrite,molybdenite,and sphalerite in the porphyry Cu ore of the Yangla Cu deposit and compared them with the chemical compositions of sulfides in the skarn Cu ore.The trace element contents and their occurrences were used to estimate the metallogenic temperature and infer the genesis of the Yangla deposit.The results show that the sulfides in the porphyry Cu ores have variations of ore element concentrations relative to their theoretical values.Pyrite is depleted in S but elevated in Fe;chalcopyrite is depleted in Cu,Fe,and S;and molybdenite and sphalerite are enriched in S whilst depleted in Mo and Zn.The concentrations of the main metallogenic elements Cu,Fe,Mo,Zn,and S in the porphyry are generally lower than those in skarn,suggesting that the porphyry ore was formed in a moderate to moderate-high temperature metallogenic environment.The formation time may also be slightly later than that of the skarn Cu ore.Elements such as As,Co,Cu.Pb,Zn,Mo,Cd,and Ni mainly exist as isomorphic replacements and mineral inclusions in the sulfides of both porphyry and skarn Cu ores.The trace element features of sulfides in the two ore bodies show that the Yangla Cu deposit may be a composite super imposed ore deposit,and让s formation has undergone the process of exhalative-sedimentary to skarnporphyry mineralization. 展开更多
关键词 Sulfides Trace elements Chemical composition Yangla cu deposit YUNNAN
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