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| 1 | Microstructure evolution and mechanical properties of linear friction welded S31042 heat-resistant steel显示文摘S31042 heat-resistant steel was joined by linear friction welding(LFW) in this study. The microstructure and the mechanical properties of the LFWed joint were investigated by optical microscopy, scanning electronic microscopy, transmission electron microscopy, hardness test and tensile test. A defect-free joint was achieved by using LFW under reasonable welding parameters. The dynamic recrystallization of austenitic grains and the dispersed precipitation of NbCrN particles resulting from the high stress and high temperature in welding, would lead to a improvement of mechanical property of the welded joint.With increasing the distance from the weld zone to the parent metal, the austenitic grain size gradually increases from ~1μm to ~150μm, and the microhardness decreases from 301 HV to 225 HV. The tensile strength(about 731 MPa) of the welded joint is comparable to that of the S31042 in the solution-treated state. | Yanmo Li Yongchang Liu Chenxi Liu Chong Li Zongqing Ma Yuan Huang Zumin Wang Wenya Li | 2018 | Journal of Materials Science & Technology2018，34，4： | 5 |
| 2 | Bismuth oxychloride hollow microspheres with high visible light photocatalytic activity显示文摘二铋氯氧化物, BiOCl 和双性人 24 O 31 Cl 10, 成功地用碳的 microsphere 被综合牺牲的模板。从 BiOCl 的阶段进化到双性人 24 O 31 Cl 10 被在 600 点加热前者容易认识到?? | Pengzhen Cui Jiali Wang Zumin Wang Jun Chen Xianran Xing Lianzhou Wang Ranbo Yu | 2016 | Nano Research2016，9，3： | 4 |
| 3 | Microstructure-dependent oxidation behavior of Ni-Al single-crystal alloys显示文摘The effect of theγ+γtwo-phase structure on the oxidation behaviors of Ni-Al single-crystal alloys at 650℃was investigated by scanning electron microscopy,transmission electron microscopy,atomic force microscopy,X-ray diffraction and Auger electron spectroscopy.In the initial oxidation stage,the oxidation behavior is primarily determined by the growth pattern of oxides in theγchannel.The outward convex NiO was formed in unprotected wideγchannels.And Ni-Al spinel oxide provides a great number of short-circuit paths,accelerating the inward diffusion of oxygen and outward diffusion of Ni.In the late stage of oxidation,the elongated internal oxide in the largeγphase contributes to the diffusion of oxygen along the oxide/metal interface.Consequently,the Ni-Al single-crystal alloy with wideγchannels and largeγprecipitates exhibited poor oxidation performance. | Jianlu Pei Yefan Li Chong Li Zumin Wang Yongchang Liu Huijun Li | 2020 | Journal of Materials Science & Technology2020，52，17： | 4 |
| 4 | Ultra-fine W-Y_(2)O_(3)composite powders prepared by an improved chemical co-precipitation method and its interface structure after spark plasma sintering显示文摘Y_(2)O_(3)-doped tungsten(W-Y_(2)O_(3))composite powders prepared by a traditional chemical co-precipitation method possess obvious bimodal distribution in size,which would deteriorate their sintering properties.The bimodal distribution can be effectively eliminated by an improved chemical co-precipitation method,in which the cationic surfactant cetyltrimethyl-ammonium bromide(CTAB)was innovatively employed.The reduced powders with excellent uniformity have an average grain size of only~31.5 nm.It is noteworthy that Y_(2)O_(3)particles would fuse and grow with the growth of W grains during subsequent spark plasma sintering(SPS)process,which was rarely reported in relevant literature before.On top of that,phase interfaces of sintered W-Y_(2)O_(3)alloys were systematically analyzed.Compared to the intracrystalline oxygen content,the oxygen content at W/Y_(2)O_(3)phase boundaries is relatively higher.It can be found that the(110)crystal planes of W form coherent,semi-coherent,and non-coherent interfaces with different crystal planes of Y_(2)O_(3).The weak interfacial bonding strength between W and Y_(2)O_(3)phases results from relatively more oxygen impurities as well as more semi-coherent/non-coherent interfaces at phase boundaries compared with the inner W grains. | Weiqiang Hu Qingshuang Ma Zongqing Ma Yuan Huang Zumin Wang Yongchang Liu | 2019 | Tungsten2019，1，3： | 3 |
| 5 | Oxidation of amorphous alloys显示文摘Owing to their unique short-or medium-range ordered microstructures and excellent mechanical, physical, and chemical properties, amorphous alloys have attracted significant interest in recent years. For the application of amorphous alloys, clarifying their oxidation processes and mechanisms is necessary since many of the surface-related properties of amorphous alloys largely depend on the surface oxide layer.The aim of this paper is to review the recent research on the thermal oxidation behaviors of amorphous alloys under pure oxygen or air condition. The contents are divided into three categories according to the number of components the research considers, i.e., the oxidation of binary, ternary, and multi-component(>3) amorphous alloys. Each section discusses the thermal stability of the amorphous matrix, oxidation kinetics, and the oxide layer and amorphous substrate, which are strongly affected by internal factors(i.e., alloy elements and microstructure) and external factors(i.e., oxidation temperature, duration, and oxygen partial pressure, etc.). The general features of the oxidation of amorphous alloys – from simple binary to complex multi-component amorphous alloys – will be summarized. This overview of the current scientific understanding on the fundamentals of these materials may provide guidelines for the development of strongly corrosion-resistant amorphous alloys. | Zhiqiang Xu Yifei Xu An Zhang Jiangyong Wang Zumin Wang | 2018 | Journal of Materials Science & Technology2018，34，11： | 3 |
| 6 | Cobalt hollow nanospheres: controlled synthesis, modification and highly catalytic performance for hydrolysis of ammonia borane显示文摘Size tunable cobalt hollow nanospheres with high catalytic activity for the ammonia borane(AB) hydrolysis have been synthesized by using the solvothermal method. The complexation between Co2+and ethylenediamine is observed to be critical for the formation of the cobalt hollow nanospherical structure.The morphology of the cobalt hollow nanospheres can be regulated by adjusting the original ethylenediamine/ethanol volume ratio, reaction time and temperature. Impressively, the magnetic property study reveals that the coercivity of the as-synthesized cobalt hollow nanospheres is much enhanced compared with that of bulk cobalt materials. Meanwhile, Co/Pt bimetal hollow nanospheres(Co Pt HS) and graphene-cobalt hollow composite nanospheres(Co HS-r GO) have also been explored. In comparison with the cobalt hollow nanospheres, both the Co Pt HS and Co HS-r GO show higher catalytic activities and better repeatability for the catalytic hydrogen generation from AB hydrolysis. Moreover, it is noted that these catalysts could be recycled by using the magnetic separation method. | Wangya Wei Zumin Wang Jie xu Lingbo Zong Kun Zhao Hao Wang Haiyan Li Ranbo Yu | 2017 | Science Bulletin2017，62，5： | 3 |
| 7 | Microstructure evolution and interface structure of Al-40 wt% Si composites produced by high-energy ball milling显示文摘High silicon content Al-Si composites with a composition of Al-40 wt% Si were fabricated via a highenergy ball milling method. The microstructure evolution of Al-40 wt% Si milled powders and sintered composites has been thoroughly studied by scanning electron microscopy, X-ray diffraction, energydispersive spectrometry and high-resolution transmission electron microscopy. The mechanism of ball milling Al-40 wt% Si powders has been disclosed in detail: fracture mechanism dominating in the early stages, followed by the agglomeration mechanism, finally reaching the balance between the fragments and the agglomerates. It has been found that the average particle sizes of mixed Al-Si powders can be refined to the nanoscale, and the crystallite sizes of Al and Si have been reduced to 10nm and 62nm upon milling for 2h–50h, respectively. The finally formed Al-Si interfaces after ball milling for 50h are wellcohesive. A dense and homogenous Al-40 wt% Si composite have been achieved by solid-state sintering at550?C. The results thus provide an effective support for producing bulk nanostructured Al-Si composites. | Yuanyuan Chen Zhangping Hu Yifei Xu Jiangyong Wang Peter Schützendübe Yuan Huang Yongchang Liu Zumin Wang | 2019 | Journal of Materials Science & Technology2019，35，4： | 2 |
| 8 | Towards a Service-Oriented Architecture for a Mobile Assistive System with Real-time Environmental Sensing显示文摘With the growing aging population, age-related diseases have increased considerably over the years.In response to these, Ambient Assistive Living(AAL) systems are being developed and are continually evolving to enrich and support independent living. While most researchers investigate robust Activity Recognition(AR)techniques, this paper focuses on some of the architectural challenges of the AAL systems. This work proposes a system architecture that fuses varying software design patterns and integrates readily available hardware devices to create Wireless Sensor Networks(WSNs) for real-time applications. The system architecture brings together the Service-Oriented Architecture(SOA), semantic web technologies, and other methods to address some of the shortcomings of the preceding system implementations using off-the-shelf and open source components. In order to validate the proposed architecture, a prototype is developed and tested positively to recognize basic user activities in real time. The system provides a base that can be further extended in many areas of AAL systems,including composite AR. | Darpan Triboan Liming Chen Feng Chen Zumin Wang | 2016 | Tsinghua Science and Technology2016，21，6： | 2 |
| 9 | Stable confinement of Fe/Fe_(3)C in Fe,N-codoped carbon nanotube towards robust zinc-air batteries显示文摘Catalytic oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)have garnered great attention as the key character in metal-air batteries.Herein,we developed a superior nonprecious bifunctional oxygen electrocatalyst,fabricated through spatial confinement of Fe/Fe_(3)C nanocrystals in pyridinic N and Fe-Nx rich carbon nanotubes(Fe/Fe_(3)C-N-CNTs).During ORR,the resultant electrocatalyst exhibits positive onset pote ntial of 1.0 V(vs.RHE),large half-wave potentials of 0.88 V(vs.RHE),which is more positive than Pt/C(0.98 V and 0.83 V,respectively).Remarkably,Fe/Fe_(3)C-N-CNTs exhibits outstanding durability and great methanol tolerance,exceeding Pt/C and most reported nonprecious metal-based oxygen reduction electrocatalysts.Moreover,Fe/Fe_(3)C-N-CNTs show a markedly low potential at j=10 mA/cm^(2),small Tafel slopes and extremely high stability for OER.Impressively,the Fe/Fe_(3)C-N-CNTs-based Zn-air batteries demonstrate high power density of 183 mW/cm^(2)and robust charge/discharge stability.It is revealed that the spatial confinement effect can impede the aggregation and corrosion of Fe/Fe_(3)C nanocrystals.Meanwhile,Fe/Fe_(3)C and Fe-Nx play synergistic effect on boosting the ORR/OER activity,which provides an important guideline for construction of inexpensive nonprecious metal-carbon hybrid nanomaterials. | Lingbo Zong Xin Chen Shuming Dou Kaicai Fan Zumin Wang Wenjun Zhang Yunmei Du Jie Xu Xiaofei Jia Qi Zhang Xia Li Yida Deng Yanan Chen Lei Wang | 2021 | Chinese Chemical Letters2021，32，3： | 2 |
| 10 | Supermodulus effect by grain-boundary wetting in nanostructured multilayers显示文摘The effect of thermal treatments on mechanical properties was systematically investigated in Ni/Mo multilayers with a constant modulation period(160 nm)prepared by magnetron sputtering deposition.A supermodulus effect was found in the annealed multilayers as compared to the as-deposited state.A large tensile stress development was observed in the multilayers.The evolution of grain-boundary(GB)wetting was observed at the interfaces of the multilayers,which results in an enhanced modulus based on the mechanism of GB-wetting-induced interfacial stress/strain.The GB wetting phenomenon was further supported by a thermodynamic calculation.The results not only bring clear evidence of the important role of interfacial structures in governing the elastic behavior of metallic multilayers,but also allow designing the multilayers with special properties through atomic diffusion and wetting at the interfaces based on the thermodynamic calculation. | Jing Wang Lu Han Xiaohu Li Dongguang Liu Laima Luo Yuan Huang Yongchang Liu Zumin Wang | 2021 | Journal of Materials Science & Technology2021，，6： | 1 |
| 11 | Anchoring nitrogen-doped Co_(2)P nanoflakes on NiCo_(2)O_(4)nanorod arrays over nickel foam as high-performance 3D electrode for alkaline hydrogen evolution显示文摘Effective and robust electrocatalysts are mainly based on innovative materials and unique structures.Herein,we designed a flakelike cobalt phosphide-based catalyst supporting on NiCo_(2)O_(4)nanorods array,which in-situ grew on the nickel foam(NF)current collector,referring as NCo_(2)P/NiCo_(2)O_(4)/NF electrode.By optimizing the microstructure and electronic structure through 3D hierarchy fabrication and nitrogen doping,the catalyst features with abundant electrochemical surface area,favorable surface wettability,excellent electron transport,as well as tailored d band center.Consequently,the as-prepared N-Co_(2)P/NiCo_(2)O_(4)/NF electrode exhibits an impressive HER activity with a low overpotentials of58 mV at 10 mA cm^(-2),a Tafel slop of 75 mV dec^(-1),as well as superior durability in alkaline medium.This work may provide a new pathway to effectively improve the hydrogen evolution performance of transition metal phosphides and to develop promising electrodes for practical electrocatalysis. | Xiaohao Ji Xiaoyu Chen Lijuan Zhang Cheng Meng Yilei He Xing Zhang Zumin Wang Ranbo Yu | 2023 | Green Energy & Environment2023，8，2： | 1 |
| 12 | Restoration of Eutrophic Water Using Nymphaea tetragona Georgi显示文摘[Objective]The study aimed to explore the approaches of utilizing Nymphaea tetragona Georgi by doing research on removing nitrogen and phosphorus from sewage using N.tetragona Georgi.[Method]With N.tetragona Georgi as the research object,a comparative analysis on the content of total nitrogen(TN) and total phosphorus(TP) was carried out after N.tetragona Georgi was planted in sewage.TN content was determined by alkaline potassium persulfate digestion-UV spectrophotometric method(GB11894-89),and TP content was measured by using ammonium molybdate spectrophotometric method(GB11893-89).[Result]The removal rate of TN and TP reached 12.31% and 8.64% respectively under natural conditions after N.tetragona Georgi was cultivate in the sewage for 13 days.Afterward,the removal rate has no significant change.[Conclusion]N.tetragona Georgi can purify sewage to some degree,and the removal efficiency of TN was higher than that of TP. | Xianxiang Dai Dongli Duan Shuangyan Wang Zumin Zhang Zhouping Yang Hua Zhen | 2013 | Meteorological and Environmental Research2013，4，1： | 1 |
| 13 | Direct alloying of immiscible molybdenum-silver system and its thermodynamic mechanism显示文摘Direct alloying is difficult to be realized in an immiscible Mo-Ag system with a positive formation heat due to the absence of thermodynamic driving force at equilibrium.In this work,a direct alloying method is developed to realize the direct alloying between Mo and Ag and construct Mo-Ag interface.The direct alloying method was mainly carried out through a direct diffusion bonding for Mo and Ag rods at a temperature close to the melting point of Ag(Tm Ag).Then the microstructure and phase constitution of the as-constructed Mo-Ag interface are characterized.The results show that Mo-Ag metallurgical bonding interface has been constructed successfully,indicating that a direct alloying in the immiscible Mo-Ag system has been realized.Additionally,mechanical tests are carried out for the Mo-Ag joints prepared through the direct alloying method.The test results show that the average maximum tensile strength of the joints is about 107 MPa.The effect of alloying parameters on the tensile strength is also discussed,which shows that there is an effective temperature range for the direct alloying between Mo and Ag.Lastly,an improved thermodynamic model that considers the formation of Mo-Ag crystalline and amorphous phase is presented to reveal the thermodynamic mechanism of the direct alloying.Combining the calculation and differential scanning calorimetry(DSC)tests results,the Gibbs energy diagram for the direct alloying is obtained.It is confirmed that the co-release of storage energy and surface energy can serve as the thermodynamic driving force to overcome the effect of positive formation heat and lead to direct alloying for Mo-Ag systems. | Jinlong Du Cai Li Zumin Wang Yuan Huang | 2021 | Journal of Materials Science & Technology2021，，6： | 1 |
| 14 | Facile Synthesis of Fe-based MOFs(Fe-BTC) as Efficient Adsorbent for Water Purifications显示文摘Fe-based metal-organic frameworks(Fe-BTC) were successfully synthesized in a large scale by using a simple one-pot method at room temperature. To understand its composition, texture and morphology, the as-synthesized material was analyzed systematically. Moreover, based on the adsorption property for anionic organic dyes(methyl orange, Congo red), cationic organic dves(methylene blue, rhodamine B) and heavy metal ions(Pb^2+) in aqueous solutions, it was revealed that the obtained Fe-BTC showed excellent capacities and adsorption rates tor different adsorbates. Besides the general adsorption eftect derived from the numerous pores and large specific surface area, the electrostatic forces and Л-Л interactions between benzene rings are believed to play significant roles in the large uptakes of this Fe-BTC sample. And the existence of mesopores in Fe-BTC might accelerate the adsorption. | HAN Qian WANG Zumin CHEN Xiaoyu JIAO Chuangwei LI Haiyan YU Ranbo | 2019 | Chemical Research in Chinese Universities2019，35，4： | 1 |
| 15 | Preliminary Study on Heavy Metal Pollution Status of Farmland Soil at Two Sides of Cheng-Guan Expressway显示文摘The heavy metal content of the farmland soil at two sides of Cheng-Guan Expressway is measured to make a preliminary evaluation on its heavy metal pollution status.After digestion and volume fixation of the soil samples collected,measure the Cu,Zn,Cd,Pb and Cr content with atomic absorption spectrophotometry and evaluate the measured data according to Level Two of National Soil Environmental Quality Standard to obtain the contamination status.Cu,Zn and Cd content of the farmland soil for sections of Cheng-Guan Expressway goes beyond Level Two of National Soil Environmental Quality Standard,while the Pb and Cr content meets Level Two of National Soil Environmental Quality Standard.Pb and Cr content of the farmland soil at two sides of Cheng-Guan Expressway is in safe state,while the Cu,Zn and Cd content is in a mild contamination state.Cu,Zn and Cd are the main pollution elements. | Dongli DUAN Shuangyan WANG Zumin ZHANG Zhouping YANG Hua ZHEN | 2013 | Asian Agricultural Research2013，5，8： | 0 |
| 16 | Role of solute in stress development of nanocrystalline films during heating:An in situ synchrotron X-ray diffraction study显示文摘The effect of the solute(Mo)on the stress development of nanocrystalline Ni and Ni-Mo films upon heat-ing has been investigated in real time using in situ synchrotron X-ray diffraction.The complex and distinct relationship between the film stress and grain boundaries(GBs)has been examined by the evolution of real-time intrinsic stress in combination with the in situ grain growth and thermal characterizations.The different intrinsic stress evolutions in the Ni and Ni-Mo films during the heating process result from the modification of GBs by Mo alloying,including GB amorphization,GB relaxation,and GB segregation.It has been found that GBs play a vital role in the stress development of nanocrystalline films.The addition of a solute can not only inhibit grain growth but also influence the stress evolution in the film by changing the atomic diffusivity at the GBs.This work provides valuable and unique insights into the effect of solutes on stress development in nanocrystalline films during annealing,permitting control of the film stress through solute addition and heat treatment,which is critical for improving the design,processing,and lifetime of advanced nanocrystalline film devices at high temperatures. | Jing Wang Xiaohu Li Emad Maawad Lu Han Yuan Huang Yongchang Liu Zumin Wang | 2023 | Journal of Materials Science & Technology2023，，13： | 0 |
| 17 | Constructing BaTiO_(3)/TiO_(2)@polypyrrole composites with hollow multishelled structure for enhanced electromagnetic wave absorbing properties显示文摘BaTiO_(3)/TiO_(2)@polypyrrole(PPy)composites with hollow multishelled structure(HoMS)were constructed to enhance the electromagnetic wave absorbing properties of BaTiO_(3)-based absorbing material.BaTiO_(3)/TiO_(2)HoMSs were prepared by hydrothermal crystallization using TiO_(2)Ho MSs as template.Then,FeCl3 was introduced to initiate the oxidative polymerization of pyrrole monomer,forming BaTiO_(3)/TiO_(2)@PPy HoMSs successfully.The electromagnetic wave absorbing properties of BaTiO_(3)/TiO_(2)HoMSs and BaTiO_(3)/TiO_(2)@PPy Ho MSs with different shell number were investigated using a vector network analyzer.The results indicate that BaTiO_(3)/TiO_(2)@PPy HoMSs exhibit improved microwave absorption compared with BaTiO_(3)/TiO_(2)HoMSs.In particular,tripled-shelled BaTiO_(3)/TiO_(2)@PPy HoMS has the most excellent absorbing performance.The best reflection loss can reach up to-21.80 dB at 13.34 GHz with a corresponding absorber thickness of only 1.3 mm,and the qualified absorption bandwidth of tripled-shelled BaTiO_(3)/TiO_(2)@PPy HoMS is up to 4.2 GHz.This work paves a new way for the development of high-performance composite microwave absorbing materials. | Dan Mao Zhen Zhang Mei Yang Zumin Wang Ranbo Yu Dan Wang | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，3： | 0 |
| 18 | Anomalous formation of micrometer-thick amorphous oxide surficial layers during high-temperature oxidation of ZrAl2显示文摘The thermal oxidation of ZrAl2 in the temperature range of 550–750℃ in pure oxygen has been investigated by a combinational experimental approach using X-ray diffraction, scanning electron microscopy/energy dispersive spectrometer, Auger electron spectroscopy and cross-sectional transmission electron microscopy. The thermal oxidation leads to the growth of anomalously thick(up to 4.5 μm)amorphous(Zr0.33 Al0.67)O1.66 surficial layers at temperatures as high as 750℃. The oxidation kinetics obeys a parabolic law with an activation energy of 143 kJ/mol. The underlying mechanism for the formation of such micrometer-thick amorphous oxide surficial layers has been discussed on the basis of interface thermodynamics and the occurrence of high interface stability associated with a synchronous oxidation of Al and Zr elements. | Zhangping Hu Yifei Xu Yuanyuan Chen Peter Schutzendube Jiangyong Wang Yuan Huang Yongchang Liu Zumin Wang | 2019 | Journal of Materials Science & Technology2019，35，7： | 0 |
| 19 | A comparison study of prevalence,awareness,treatment and control rates of hypertension and associated factors among adults in China and the United States based on national survey data显示文摘Objective:This study compared the prevalence,awareness,treatment and control of hypertension and associated factors in China and the United States(US).Methods:Adult data from nationally representative samples were derived from the Chronic Disease and Risk Factors Surveillance in 2010 and 2013 in China and the National Health and Nutrition Examination Survey in 2010 and 2013 in the US.Multivariable logistic and Poisson regression analysis were conducted to assess associations of the four outcomes with body weight status and behavioral factors.Results:Age-standardized prevalence rates of hypertension was 35.7%(95%confidence interval[CI]:35.4%to 36.1%)in 2010 and 29.8%(95%CI:29.4%to 30.2%)in 2013 in China,and 35.3%(95%CI:33.6%to 37.1%)in 2010 and 37.9%(95%CI:36.0%to 39.7%)in 2013 in the US.Among hypertensive participants,the age-standardized rates of treatment were 18.4%(95%CI:17.9%to 1&9%)in 2010 and 23.8%(95%CI:23.1%to 24.6%)in 2013 in China and 54.5%(95%CI:50.3%to 5&7%)in 2010 and 50.9%(95%CI:46.5%to 55.3%)in 2013 in the US;the age-standardized hypertension control rates were 3.2%(95%CI:3.0%to 3.5%)and 5.7%(95%CI:5.3%to 6.0%)in 2010 and 2013 in China and 50.6%(95%CI:46.2%to 55.0%)and 55.3%(95%CI:50.3%to 60.3%)in the US.Obesity was significantly associated with prevalence,awareness and control rates in both countries.Different from the US,obesity was negatively associated with hypertension control in China.Conclusion:Hypertension prevalence in China is similar to that in the US,but the control rate in China was significantly lower.Obesity was a critical risk factor for poor hypertension control in China. | Xiaomin Sun Xinguang Chen Zumin Shi Alice Fang Yan Zhongying Li Shiqi Chen Bingtong Zhao Wen Peng Xi Li Mei Zhang Limin Wang Jing Wu Youfa Wang | 2023 | Global Health Journal2023，7，1： | 0 |
| 20 | Geochronology of minerrlization and tectonic setting of Baishidong skaro-type iron deposit in Helony aree of Yanbian,Jilin Province,NE China显示文摘The Baishidong iron deposit is the only skarn-type iron deposit discovered in the study area.According to mineral assemblage and paragenesis,the mineralization can be divided into four metallogenic stages:early garnet-diopside skarn stage,late magnetite-tremolite-epidote skarn stage,early quartz-pyrite-chalcopyrite stage and late quartz-calcite-pyrite stage.Through LA-ICP-MS zircon U-Pb dating of diorite,which is closely related to mineralization,the results show that the weighted average age is 164.6±1.4 Ma,which limits the mineralization time of Baishidong iron deposit during or slightly later than Middle Jurassic.The diorite rocks are rich in sodium(Na_(2)O/K_(2)O=1.24-1.76),aluminium(Al_(2)O_(3)=17.41%-18.76%),LREE and large-ion lithophile elements(Ba,K and Sr),depleted in HREE and high-field-strength elements(Y,Nb,Ta,P and Ti),and show strongly fractionated patterns(LREE/HREE=6.58-9.93),no apparent Eu anomalies(δEu=0.91-1.13),which shows similar characteristics to island arc or active continental margin arc magma.The zirconεHf(t)values range from-22.6 to 5.9,and the age of the two-stage model(t_(DM2))is 836-2633 Ma.Above data combined with the geochemical characteristics,it is indicated that the magma was a mixture of multiple sources,composed of ancient materials and newly formed crust.During the process of evolution and ascending of magma,separation and crystallization occurred,and a large amount of continental crust material was mixed at the same time.Combined with regional tectonic evolution,the formation of this deposit may be related to the westward subduction of the Paleo-Pacific Plate to the Eurasian Plate. | NIE Xitao ZHANG Yajing WANG Fuliang SU Zumin | 2021 | Global Geology2021，24，1： | 0 |
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