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Geochronology,Petrogenesis and Tectonic Setting of the Late Jurassic I-type Granites in the North Qinling Orogenic Belt,Central China

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Acta Geologica Sinica(English Edition) 2023年第4期97卷 1132-1149页

作者： HUANG Yanna LI Dunpeng XIAO Aifang XU Songming college of zijin Geology and Mining Fuzhou UniversityFuzhou 350108China

The North Qinling Orogenic Belt(NQOB)is a composite orogenic belt in central *** started evolving during the Meso-Neoproterozoic period and underwent multiple stages of plate subduction and collision before entering intra-continental orogeny in the Late *** Meso-Cenozoic intra-continental orogeny and tectonic evolution had different responses in various terranes of the belt,with the tectonic evolution of the middle part of the belt being particularly *** granites distributed in the Dayu and Kuyu areas in the middle part of the NQOB can provide an important window for revealing the geodynamic mechanisms of the *** main lithology of Dayu and Kuyu granites is biotite monzogranite,and the zircon U-Pb dating yielded intrusive ages of 151.3±3.4 Ma and 147.7±1.5 Ma,*** dates suggest that the biotite monzogranite were formed at the end of the Late *** whole-rock geochemistry analysis shows that the granites in the study areas are characterized by slightly high SiO_(2)(64.50-68.88 wt%)and high Al_(2)O_(3)(15.12-16.24 wt%)and Na_(2)O(3.55-3.80 wt%)*** are also enriched in light rare earth elements,large ion lithophile elements(e.g.,Ba,K,La,Pb and Sr),and depleted in high field strength elements(HFSEs)(e.g.,Ta,Nb,P and Ti).Additionally,the granites have weakly negative-slightly positive Eu anomalies(δEu=0.91-1.19).Zircon Lu-Hf isotopic analysis showedε_(Hf)(t)=-6.1--3.8,and the two-stage model age is T_(2DM(crust))=1.5-1.6 *** granites in the study areas are analyzed as weak peraluminous high-K calc-alkaline I-type *** formed by partial melting of the thickened ancient lower crust,accompanied by the addition of minor mantle-derived *** magma ascent,they experienced fractional crystallization,with residual garnet and amphibole for a certain proportion in the magma source *** the geotectonic data suggest that the end of the Late Jurassic granite magmatism in the Dayu and K

关键词： partial melting tectonic transition I-type granite Late Jurassic North Qinling Orogenic Belt

Effect of Carried-Envelope Phase on Transient Process in a Cascade-Type System

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Communications in Theoretical Physics 2010年第3期53卷 565-568页

作者：郑利丽郁玲艳 School of Physics Ludong University Nanjing University of Science and Technology zijin college

This paper investigates the effect of carried-envelope phase on transient process in a cascade-type atomic system, which is driven by two ultrashort laser pulses （probe and signal laser）. It is found that the one- and two-photon processes corresponding to pathway ｜0〉→｜1〉and ｜0〉→｜1〉→｜2〉 can be enhanced or ,suppressed by modulating the carried-envelope phases of probe laser pulse. Our numerical results also show that the transient populations of two excited states can be periodically affected by the carried-envelope phase of probe laser pulse. With certain time, the partial population transfer between two exited states can be realized just by adjusting the carried-envelope phase of probe laser pulse.

关键词： carried-envelope phase transient process cascade-type system

Effect and mechanism of siderite on reverse flotation of hematite

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International Journal of Minerals,Metallurgy and Materials 2016年第4期23卷 373-379页

作者： Wan-zhong Yin Dong Li Xi-mei Luo Jin Yao Qian-yu Sun college of Resources and Civil Engineering Northeastern University college of zijin Mining Fuzhou University Faculty of Land Resource Engineering Kunming University of Science and Technology

The effects of siderite on reverse flotation of hematite were investigated using micro flotation, adsorption tests, and Fourier transform infrared spectroscopy. The flotation results show that interactions between siderite and quartz are the main reasons that siderite significantly influences the floatability. The interactions are attributed to dissolved siderite species and fine siderite particles. The interaction due to the dissolved species is, however, dominant. Derjaguin-Landau-Verwey-Overbeek（DLVO） theoretical calculations reveal that adhesion on quartz increases when the siderite particle size decreases and that fine particles partly influence quartz floatability. Chemical solution calculations indicate that the dissolved species of siderite might convert the surface of active quartz to CaCO_3 precipitates that can be depressed by starch. The theoretical calculations are in good agreement with the results of adsorption tests and FTIR spectroscopy and explain the reasons why siderite significantly influences reverse flotation of hematite.

关键词： hematite siderite reverse flotation solution chemistry

Solution chemistry of carbonate minerals and its effects on the flotation of hematite with sodium oleate

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International Journal of Minerals,Metallurgy and Materials 2017年第7期24卷 736-744页

作者： Dong Li Wan-zhong Yin Ji-wei Xue Jin Yao Ya-feng Fu Qi Liu School of Resources and Civil Engineering Northeastern University college of zijin Mining Fuzhou University Department of Chemical and Materials Engineering University of Alberta

The effects of carbonate minerals（dolomite and siderite） on the flotation of hematite using sodium oleate as a collector were investigated through flotation tests, supplemented by dissolution measurements, solution chemistry calculations, zeta-potential measurements, Fourier transform infrared（FTIR） spectroscopic studies, and X-ray photoelectron spectroscopy（XPS） analyses. The results of flotation tests show that the presence of siderite or dolomite reduced the recovery of hematite and that the inhibiting effects of dolomite were stronger. Dissolution measurements, solution chemistry calculations, and flotation tests confirmed that both the cations（Ca^（2＋） and Mg^（2＋）） and CO_3^（2＋）ions dissolved from dolomite depressed hematite flotation, whereas only the 23CO-ions dissolved from siderite were responsible for hematite depression. The zeta-potential, FTIR spectroscopic, and XPS analyses indicated that Ca^（2＋）, Mg^（2＋）, and CO_3^（2-）（HCO_3^-） could adsorb onto the hematite surface, thereby hindering the adsorption of sodium oleate, which was the main reason for the inhibiting effects of carbonate minerals on hematite flotation.

关键词： hematite carbonate minerals solution chemistry sodium oleate flotation

Strain-induced magnetism in ReS_2 monolayer with defects

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Chinese Physics B 2016年第11期25卷 430-433页

作者：张小欧李庆芳 Department of Electrical Engineering and Photoelectric Technology Zijin College of Nanjing University of Technology Department of Physics Nanjing University of Information Science & Technology

We investigate the effects of strain on the electronic and magnetic properties of ReS2 monolayer with sulfur vacancies using density functional *** ReS2 monolayer with monosulfur vacancy（Vs） and disulfur vacancy（V（2S））both are ***,as strain increases to 8%,VS-doped ReS2 monolayer appears a magnetic half-metal behavior with zero total magnetic *** particular,for V（2S）-doped ReS2 monolayer,the system becomes a magnetic semiconductor under 6%strain,in which Re atoms at vicinity of vacancy couple anti-ferromagnetically with each other,and continues to show a ferromagnetic metal characteristic with total magnetic moment of 1.60μb under 7%*** results imply that the strain-manipulated ReS2 monolayer with VS and V（2S） can be a possible candidate for new spintronic applications.

关键词： monolayer defects magnetism ferromagnetic candidate vicinity fabrication Strain magnetization tensile

Molecular structures and activity of organic depressants for marmatite,jamesonite and pyrite flotation

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Transactions of Nonferrous Metals Society of China 2010年第10期20卷 1993-1999页

作者：陈建华李玉琼龙秋容 college of Resources and Metallurgy Guangxi University college of Chemistry and Chemical Engineering Guangxi University Design and Research Institute of Mining and Metallurgy Zijin Mining Group Limited Company

Ten kinds of organic depressants were used to investigate the depressing performance on marmatite and *** results show that the organic compounds only with single group of hydroxyl(-OH),carboxyl(-COOH) or amino(-NH2) in molecule are ineffective in depressing marmatite,jamesonite and *** combinations of these functional groups still cannot enhance the depressing ability of organic *** thioglycollic acid containing reductive functional group(-SH) has a good depressing performance for marmatite and *** presence of benzene ring in molecule can enhance the depressing *** functional group electronegativity,hydrophilic-hydrophobic indexes and frontier orbital of organic depressants were calculated,and the criterion for the depressing effect of organic depressants to sulphide minerals was proposed.

关键词： marmatite pyrite organic depressant frontier orbital

NMR-based damage characterisation of backfill material in host rock under dynamic loading

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International Journal of Mining Science and Technology 2020年第3期30卷 329-335页

作者： Binglei Li Jiquan Lan Guangyao Si Guopeng Lin Liuqing Hu college of zijin Mining Fuzhou UniversityFuzhou 350108China School of Minerals and Energy Resources Engineering University of New South WalesSydney 2205Australia

It is not uncommon that backfill material used in underground mining being exposed to repetitive dynamic stresses induced by blasting operations or rockburst events. Understanding the strength and fracture evolution of backfilled stopes is critical to maintain the long-term stope stability and ensure safe mining activities. This paper aims to study the damage evolution of the backfill material and its host rock behaviour under three-dimensional(3D) dynamic loading. Using a true-triaxial testing machine, multiple samples of backfill material enclosed by country rock were fabricated and tested under various dynamic loadings with different true-triaxial confining stress conditions. In addition, the nuclear magnetic resonance(NMR) measurement was conducted on the samples before and after exerting static and dynamic loading to obtain their porosity distribution changes. The experiment results suggested that with the increase of the dynamic loading, the porosity of the backfill sample goes through a two-stage process,which shows a slightly linear decrease and then followed by an exponential increase. The research findings can help understand the damage mechanism and fracture development of backfilled stopes and its host rock in deep underground mines, which are constantly subject to the combination of 3D static confining stress and dynamic loading.

关键词： Dynamic loading Backfill-country rock system True triaxial test Coupled static and dynamic loads Nuclear magnetic resonance(NMR) Damage evolution

Late Early-Cretaceous Magma Mixing in the Langqi Island, Fujian Province, China: Evidences from Petrology, Geochemistry and Zircon Geochronology

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Journal of Earth Science 2020年第3期31卷 468-480页

作者： Liangliang Huang Liyuan Wang Hong-Rui Fan Musen Lin Wenhui Zhang Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China college of zijin Mining Fuzhou UniversityFuzhou 350116China

The mafic enclaves from Mesozoic intermediate-acid magmatic rocks,widely developed along Fujian coast,are considered to be the results of large-scale crust-mantle interaction and magma *** this paper,petrography,mineralogy,and geochemistry of granites and mafic microgranular enclaves(MMEs)in Langqi Island are studied to provide new information for tracing crust-mantle *** zircon U-Pb dating results show that the Langqi rocks were formed at^101 Ma,which are metaluminous,enriched in silica and high-K calc-alkaline I-type *** enclaves have a typical magmatic structure,which is characterized by magma mixing between high-temperature basic magma and low-temperature acidic magma through *** enclaves and host granites show a tendency to mixed major and trace elements,displaying a clear-cut contact relationship,which is indicative of coeval *** genesis of Langqi rocks is related to the extensional setting caused by the subduction of Paleo-Pacific Plate,and they are the results of mixing of subduction-related metasomatized mantle-derived mafic and induced crustal-melted granitic magma originating from partial melting of the crustal material.

关键词： magma mixing granite mafic microgranular enclaves Langqi Fujian

Optimization and mechanism of gold-bearing sulfide flotation

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Rare Metals 2014年第3期33卷 363-368页

作者： Zhong-Mei Sun Chun-Bao Sun Ji-Zhen Wang Wan-Zhong Yin School of Civil and Environmental Engineering University of Science and Technology Beijing zijin Research Institute of Mining and Metallurgy School of Materials & Metallurgy Northeastern University college of Zi Jin Mining Fuzhou University

In order to overcome the difficulty of extracting gold from gold-bearing sulfide ore by cyanide process flotation was adopted based on mineralogical analysis Mineralogy shows that gold particles are of superfine structure and mainly enclosed by sulfide ores. Primary gold-bearing sulfide ore is fine-grained pyrite and arsenopyrite. The paper describes the effects of ratios and dosage of activators and collectors on the recovery and grade of gold concentrate. A proper flotation flowsheet was then proposed based on experimental condition and closedcircuit test. The gold concentrate with the gold grade of25.14 g ton-1and the recovery of 86.94 % is obtained after one rougher, three cleaners, and four scavengers from fine grinding flotation process. Furthermore, the mechanisms of combined activators and combined collectors were studied by thermodynamic calculation, and structure-activity relationship of flotation reagent was also explained

关键词： Gold Pyrite Arsenopyrite Activator Combined reagent Flotation