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Quantitative analysis of intrusive body morphology and its relationship with skarn mineralization——A case study of Fenghuangshan copper deposit, Tongling, Anhui, China

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Transactions of Nonferrous Metals Society of China 2018年第1期28卷 151-162页

作者： Xian-cheng MAO Ying ZHAO Hao DENG Bin ZHANG Zhan-kun LIU Jin CHEN Yan-hong ZOU jian-qing lai School of Geosciences and Info-Physics Central South University Changsha 410083 China Key Laboratory of Metallogenic Prediction of Nonferrous Metals of Ministry of Education Changsha 410083 China

The shapes of intrusive body and contact zone might influence the formation and distribution of orebodies in skarn *** taking Xinwuli intrusive body in Fenghuangshan copper deposit,Tongling,Anhui,China,as the research object,a new method was used to obtain the quantitative relationship between intrusion morphology and skarn *** first step of the method was to extract morphological characteristic parameters based on mathematical morphology and Euclidean distance transformation;then the quantitative relationship between the parameters and orebodies was analyzed;finally correlational analyses between the parameters and mineralization indices were *** results show that morphological characteristic parameters can effectively indicate the location of concealed ore bodies in skarn deposit,with the following parts as advantageous positions of skarn mineralization:(1)the parts away from the1st trend surface in the range from?25to50m;(2)the convex parts about200m away from the2nd trend surface,around which the tangent plane of the intrusive body is approximately consistent with the trend surface;(3)the contact zones with angle between intrusive body original contact surface and trend contact surface ranging from35°to70°;(4)the parts with angle between intrusive body original contact surface and regional extruding far crustal stress ranging from50°to60°.These knowledge can be applied to more skarn deposits for future mineral exploration.

关键词： intrusive body morphological analysis contact zone mathematical morphology skarn mineralization Fenghuangshan copper deposit

Numerical simulation of hydrothermal mineralization associated with simplified chemical reactions in Kaerqueka polymetallic deposit, qinghai, China

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Transactions of Nonferrous Metals Society of China 2019年第1期29卷 165-177页

作者： Yan-hong ZOU Yao LIU Yong PAN Kuan-da YANG Ta-gen DAI Xian-cheng MAO jian-qing lai Hai-long TIAN 中南大学计算地球科学研究中心长沙410083 中南大学地球科学与信息物理学院有色金属成矿预测与地质环境监测教育部重点实验室长沙410083 湖南大学嵌入式系统及网络实验室长沙410082 湖南文理学院资源环境与旅游学院常德415000 吉林大学地下水资源与环境教育部重点实验室长春130021

The Kaerqueka polymetallic deposit, qinghai, China, is one of the typical skarn-type polymetallic ore deposits in the Qimantage metallogenic belt. The dynamic mechanism on the formation of the Kaerqueka polymetallic deposit is always an interesting topic of research. We used the finite difference method to model the mineralizing process of the chalcopyrite in this region with considering the field geological features, mineralogy and geochemistry. In particular, the modern mineralization theory was used to quantitatively estimate the related chemical reactions associated with the chalcopyrite formation in the Kaerqueka polymetallic deposit. The numerical results indicate that the hydrothermal fluid flow is a key controlling factor of mineralization in this area and the temperature gradient is the driving force of pore-fluid flow. The metallogenic temperature of chalcopyrite in the Kaerqueka polymetallic deposit is between 250 and 350 ℃. The corresponding computational results have been verified by the field observations. It has been further demonstrated that the simulation results of coupled models in the field of emerging computational geosciences can enhance our understanding of the ore-forming processes in this area.

关键词： numerical simulation heat transfer chemical reaction hydrothermal mineralization Kaerqueka polymetallic deposit

Late Mesozoic Wangxiang Composite Granitic Pluton, South China Block: Implications to Magma Emplacement and Evolution from Geochemical Proxies

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Journal of Earth Science 2022年

作者： Quan Ou Jing-Yi Liu Feng Zi Bruna B.Carvalho Xiao-Ping Long jian-qing lai Kun Wang Zi-Qi jiang Yi-Zhi Liu Zheng-Lin Li Hong-Yun Wang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation and Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources Institute of Sedimentary Geology Chengdu University of Technology State Key Laboratory of Continental Dynamics Northwest University Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-Physics Central South University School of Earth Sciences and Spatial Information Engineering Hunan University of Science and Technology Dipartimento Di Geoscienze Università Degli Studi Di Padova School of Resources and Geosciences China University of Mining and Technology Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration and College of Earth Sciences Guilin University of Technology

Composite granitic pluton with distinct units is a potential target for identifying its detailed magma evolution. Here, we present zircon U-Pb ages and Hf isotope, whole-rock major and trace element compositions and Nd-Pb isotopes of the Wangxiang composite pluton, South China. New ages obtained show that these rocks were generated in Late Jurassic(ca. 156–158 Ma). The rocks are divided into low silica(SiO2 71 wt.%, two-mica granites, garnet-bearing muscovite granites and muscovite granites). The high silica rocks are enriched in light rare earth elements(LREEs) relative to heavy REEs(HREEs)((La/Yb)N= 15.6–41.9, while the low silica rocks are not(0.7–76.6). All rocks show various negative Ti, Sr, Eu and strong positive Pb anomalies. The low silica rocks have less negative values of εNd(t)(-8.79 to-6.99),similar values of(206Pb/204Pb)i(18.155–18.346) and εHf(t)(-9.51 to-3.47, except one-12.84), compared to the high silica rocks(εNd(t)=-11.14 to-10.26;(206Pb/204Pb)i= 17.935–19.093; εHf(t) =-12.03 to-7.15, except one-2.41). Data suggest that the parental magma of the studied rocks(represented by enclaves) was produced by partial melting of a garnet-free crustal source. Subsequently those crustal magmas formed the more evolved units through assimilation and fractional crystallization processes, and fluid enrichment during the final magmatic activity. Combining our results with previous multidisciplinary studies, we propose that the key factor to control the evolution of Wangxiang composite pluton is discrete emplacement of crustal magmas by dyking.

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The effect of various magnetic field configurations on a hollow-cathode discharge

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The effect of various magnetic field configurations on a hol...

Molecular simulation study of the microstructures and properties of pyridinium ionic liquid[HPy][BF_(4)]mixed with acetonitrile

作者： jian-Jun lai, qing-Ming Chen and Jun-Lin Qiu State Key Laboratory of Laser Technology, Huazhong University of Science and Technology Wuhan, Hubei 430074, People’s Republic of China

A Monte Carlo model was used to describe the behaviour of electrons and ions in an argon hollow-cathode discharge under the influence of a transverse or longitudinal magnetic field. The model included calculating the energy distribution of electrons and ions, the electron excitation and ionization rate spatial distributions and the flux and density distribution of electrons and ions. Comparisons were made between these two kinds of magnetic field to primarily distinguish their effects on the hollow-cathode effect and the sputtering process. The results show that the applied magnetic fields influence the characteristics of discharge in the negative glow more efficiently than that in the cathode dark space, and the’transverse magnetic field (parallel to the sheath electric field) is more suitable to enhance the hollow-cathode effect and sputtering process than the longitudinal one (parallel to the electrode).

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原子与分子物理学报 2025年第4期42卷 27-32页

作者： XU jian-Qiang MA Zhao-Peng CHENG Si LIU Zhi-Cong ZHU Guang-lai Department of Physics School of Physics and Electronic InformationAnhui Normal UniversityWuhu 241002China

The microstructures and thermodynamic properties of mixed systems comprising pyridinium ionic liquid[HPy][BF_(4)]and acetonitrile at different mole fractions were studied using molecular dynamics simulation in this *** following properties were determined:density,self-diffusion coefficient,excess molar volume,and radial distribution *** results show that with an increase in the mole fraction of[HPy][BF_(4)],the self-diffusion coefficient ***,the excess molar volume initially decreases,reaches a minimum,and then *** rules of radial distribution functions(RDFs)of characteristic atoms are *** increasing the mole fraction of[HPy][BF_(4)],the first peak of the RDFs of HA1-F decreases,while that of CT6-CT6 rises at first and then *** indicates that the solvent molecules affect the polar and non-polar regions of[HPy][BF_(4)]differently.

关键词： Pyridinium ionic liquids Thermodynamic properties Molecular dynamics simulation Radial distribution functions

Effect of N and Zr on as-cast microstructure and properties after annealing of a high-speed steel

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Journal of Iron and Steel Research International 2018年第4期25卷 460-468页

作者： Hao-ran Cui jian-ping lai qing-lin Pan Xiang-dong Wang School of Materials Science and Engineering Central South University Changsha 410083 Hunan China

Effects of N and Zr on the as-cast microstructure and properties after annealing of high-speed steel （HSS） were investigated by using electronic probe micro-analysis, Rockwell hardness test, X-ray diffractometry and differential scanning calorimetry with combination of microstructure analysis. The results indicate that the addition of N and Zr will refine the eutectic structures and enhance the stability of carbides which are mainly MC, M2C and M7C3. The coarse dendritic structures decrease significantly and most of the carbides are distributed in the microstructure uniformly. Moreover, a kind of Zr-Si compound which only exists in VC is discovered, and this new phase is speculated to be related with the spheroidization of VC. The annealing process is set up to 6 different time periods which are 1, 3, 6, 10, 15 and 20 h, respectively. In different annealing processes at 750 ℃ which is lower than austenitizing temperature, the addition of N and Zr makes the decrease of hardness more obvious and restrains the precipitation of secondary carbides with the extension of time. Moreover, when the annealing time reaches 20 h, some clusters appear in the matrix of the two samples, and the density of clusters in HSS1 is lower, but the matrix of HSS1 contains more C and alloying elements which indicate more carbides precipitate.

关键词： N addition Zr addition High-speed steel As-cast microstructure Precipitation Annealing

Data processing and error analysis for the CE-1 Lunar microwave radiometer

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Research in Astronomy and Astrophysics 2013年第3期13卷 359-372页

作者： jian-qing Feng Yan Su jian-Jun Liu Yong-Liao Zou Chun-lai Li National Astronomical Observatories Chinese Academy of Sciences

The microwave radiometer （MRM） onboard the Chang＇ E-1 （CE-I） lu- nar orbiter is a 4-frequency microwave radiometer, and it is mainly used to obtain the brightness temperature （TB） of the lunar surface, from which the thickness, temperature, dielectric constant and other related properties of the lunar regolith can be derived. The working mode of the CE-1 MRM, the ground calibration （including the official calibration coefficients）, as well as the acquisition and processing of the raw data are introduced. Our data analysis shows that TB increases with increasing frequency, decreases towards the lunar poles and is significantly affected by solar illumination. Our analysis also reveals that the main uncertainty in TB comes from ground calibration.

关键词： space vehicles -- instruments: microwave radiometer -- Moon: bright-ness temperature -- method: data processing -- error analysis

The deconvolution of lunar brightness temperature based on the maximum entropy method using Chang'e-2 microwave data

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Research in Astronomy and Astrophysics 2015年第2期15卷 293-304页

作者： Shu-Guo Xing Yan Su jian-qing Feng Chun-lai Li National Astronomical Observatories Chinese Academy of Sciences

A passive and multi-channel microwave sounder onboard the Chang＇e-2 orbiter has successfully acquired microwave observations of the lunar surface and subsurface structure. Compared with the Chang＇e-1 orbiter, the Chang＇e-2 orbiter obtained more accurate and comprehensive microwave brightness temperature data, which are helpful for further research. Since there is a close relationship between mi- crowave brightness temperature data and some related properties of the lunar regolith, such as the thickness, temperature and dielectric constant, precise and high resolution brightness temperature data are necessary for such research. However, through the detection mechanism of the microwave sounder, the brightness temperature data ac- quired from the microwave sounder are weighted by the antenna radiation pattern, so the data are the convolution of the antenna radiation pattern with the lunar brightness temperature. In order to obtain the real lunar brightness temperature, a deconvolution method is needed. The aim of this paper is to solve the problem associated with per- forming deconvolution of the lunar brightness temperature. In this study, we introduce the maximum entropy method （MEM） to process the brightness temperature data and achieve excellent results. The paper mainly includes the following aspects： first, we introduce the principle of the MEM; second, through a series of simulations, the MEM has been verified as an efficient deconvolution method; and third, the MEM is used to process the Chang＇e-2 microwave data and the results are significant.

关键词： space vehicles instruments: microwave sounder Moon: brightness temperature methods: maximum entropy method

A novel ligand-free palladium catalytic system with SO_3H-functional ionic liquids as cocatalyst for amidocarbonylation reaction

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Chinese Chemical Letters 2008年第10期19卷 1175-1178页

作者： qing Lu Zhao lai lai Wang State Key Laboratory for Oxo Synthesis ＆ Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

Effects of Lewis acid BF3·OEt2, and BrCnsted acids TsOH, CF3COOH, H3PO4, and HCIO4 as cocatalyst respectively on the ligand-free palladium-catalyzed amidocarbonylation were investigated. SO3H-functional ionic liquids 1-methyl-3-（4-sulfonic acid）butylimidazolium hydrosulfate [MIm（CH2）4803H][HSO4] and 1-methyl-3-（4-sulfonic acid）butylimidazolium triflate [MIm（CH2）4SO3H][OTf] were firstly employed as cocatalysts instead of these Lewis acid and Brφnsted acids. By using a ligand-free and weak corrosive catalyst in situ prepared form PdBr2, LiBr.H2O, and [MIm（CH2）4SO3H][OTf], the arnidocarbo- nylation of benzaldehyde, acetamide, and CO could proceed smoothly and afford N-acetyl-α-phenylglycine with yield of 58% in [C6mim]PF6 medium.

关键词： Amidocarbonylation Palladium Ionic liquids Benzaldehyde N-Acyl-α-amino acid