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Genesis of the Jianbeigou Gold Deposit on the Southern Margin of the North china craton: Insights from Fluid Inclusions, H-O-S Isotopes, and Pyrite in situ Trace Element Analyses

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Acta Geologica Sinica(English Edition) 2024年第4期98卷 969-991页

作者： LI Fengchun ZENG Qingdong ZHU Rixiang cHU Shaoxiong XIE Wei YU Bing WU Jinjian LI Xinghui Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for earth science Chinese Academy of SciencesBeijing 100029China college of earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of earth science and engineering Hebei University of EngineeringHandanHebei 056038China

The Jianbeigou gold deposit is a typical lode gold deposit in the Qinling metallogenic belt, located on the southern margin of the North china craton. Three stages of the hydrothermal process can be distinguished, including the quartz ± pyrite, quartz-polymetallic sulfide, and quartz-carbonate ± pyrite stages. From the early to late stages, the homogenization temperatures of primary fluid inclusions are 281–362°c, 227–331°c, and 149–261°c, respectively. The corresponding salinities estimated for these fluids are 3.9–9.9 wt%, 0.4–9.4 wt%, and 0.7–7.2 wt% Na cl equiv. combined with laser Raman spectroscopy data, the ore-forming fluid belongs to a H_(2)O-cO_(2)-Na cl ± cH_4 system with medium–low temperature and salinity. The δ~(18)Ofluid and δD values for the quartz veins are-1.0‰ to 6.0‰ and-105‰ to-84‰, respectively, which indicates that the ore-forming fluid is of mixed source, mainly derived from magma, with a contribution from meteoric water. Pyrite has been identified into three generations based on mineral paragenetic sequencing, including Py1, Py2, and Py3. The pyrites have δ~(34)S sulfur isotopic compositions from three stages between 3.7‰ and 8.4‰, indicating that sulfur mainly originated from magma. Te, Bi, Sb, and cu contents in pyrite were all high and showed a strong correlation with Au concentrations. Native gold and the Au-Ag-Bi telluride minerals were formed concurrently, and the As concentration was low and decoupled from the Au content. Therefore, Te, Bi, Sb and other low-melting point chalcophile elements play an important role for gold mineralization in arsenic-deficient ore-forming fluid. combined with the geological setting, evolution of pyrite, and ore-fluids geochemistry, we propose that the Jianbeigou deposit can be classified as a magmatic–hydrothermal lode gold deposit. Gold mineralization on the southern margin of the North china craton is related to Early cretaceous magmatism and formed in an extensional setting.

关键词： ore genesis H-O-S isotopes fluid inclusions in-situ trace element Jianbeigou gold deposit

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Geochronology,petrogenesis,and geological significance of the quartz vein-type copper deposits in Longwei area,north-west Dayaoshan,Guangxi

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Frontiers of earth science 2024年第1期18卷 68-82页

作者： Song FU Shehong LI changxing LV Longqing SHI Xuhan HU Jinming WU Zhuolin XIE college of earth sciences&engineering Shandong University of Science and TechnologyQingdao 266590China School of earth sciences Guilin University of TechnologyGuilin 541006China Xinwen Mining Group co. Ltd.Huafeng Coal MineTai’an 271409China

Quartz-vein-type copper deposits were discovered in SN-trend ore-bearing structures in north-west Dayaoshan,*** of reports on the precise metallogenic age of these deposit has become a bottleneck in metallogenic research in this *** this study,the quartz vein-type copper mine in Longwei area of Jinxiu was selected as the research *** illite samples in the fault gouges and ore samples were collected for testing and *** on the Re-Os isotope dating study,the age of pyrite isochron,belonging to the caledonian period,was determined to be 417±25 Ma,whereas that of chalcopyrite isochron belonging to the Indosinian period,was found to be 243±18 *** crystallized considerably earlier than *** obtained EPMA data were combined with rock mineralogical analysis data,Metasomatous mineral pyrite and metasomatic mineral chalcopyrite were identified to have originated from different hydrothermal *** the Indosinian period,copper deposits in the Longwei area underwent pyrite crystallization,pyrite fragmentation,copper-bearing hydrothermal filling,and metasomatism,consolidating and forming *** study determined the mineralisation time and ore sources of copper deposits in the Longwei *** study provides evidence for the existence of Indosinian hydrothermal activities in the north-western Dayaoshan area.

关键词： Re-Os dating electron probe micro-analyser quartz-vein copper deposit Dayaoshan area

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Glacial-interglacial cycles recorded in clay minerals from the eastern Tibetan Plateau over the last 800 ka and their indications

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science china earth sciences 2024年第7期67卷 2162-2177页

作者： Xiaoyan ZHANG chunxia ZHANG Yan ZHAO Bin HU Zhengtang GUO Key Laboratory of cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China college of earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China college of earth science and engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

clay mineral proxies have been widely used to reconstruct changes in provenance and the ***,high-altitude clay mineral indications and long-term and orbital variations have not been fully ***,we present an800-ka clay-mineral record from a lacustrine sediment core(ZB13-c2)from the Zoige Basin on the eastern Tibetan Plateau(TP).X-ray diffraction and scanning electron microscopy were used to identify the clay mineral assemblages and their micromorphological characteristics of core *** results revealed that the clay minerals in core ZB13-c2 are mainly illite,with small amounts of chlorite,kaolinite,and smectite(including irregular mixed-layers of illite-smectite(I/S)and chloritesmectite(c/S)).The clay mineral assemblages and proxies exhibit three stages of change,which are mainly controlled by the Zoige watershed range under different climate *** watershed was limited to the southeastern region with altitudes ranging from~3500 to~4200 meters above sea level(m a.s.l.),and glacial-interglacial hydraulic erosion controlled the input of bedrock debris during 800-621 ka *** expanded to higher altitudes(~4200 to~4700 m a.s.l.)due to stronger seasonal freezethaw weathering without significant glacial-interglacial variations under a cooling and drying climate during 621-100 ka ***,it expanded to its highest altitudes of~4700 to~5200 m *** of the watershed after 100 ka BP,and hydraulic erosion increased obviously under a warm climate of the interstadial MIS 3 on the *** watershed underwent two major expansions under different climatic conditions at~621 ka and 100 ka BP,with the wet/dry alternation became strong at~621 ka *** results reveal that long-term temperature changes and the wet/dry alternation at high altitudes controlled the watershed range and degree of the physical erosion,and that the indications of clay minerals should be carefully clarified before they are used as climate indicators,especi

关键词： Quaternary Zoige Basin Lacustrine sediments Paleoenvironment Weathering

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Acidic electroreduction cO_(2)to formic acid via interfacial modification of Bi nanoparticles at industrial-level current

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Nano Research 2024年第7期17卷 5817-5825页

作者： Tian Dong Hongdong Li Zhenhui Wang Yanling Geng Rui chang Xiaofeng Tian Jianping Lai Shouhua Feng Lei Wang Key Laboratory of Eco-chemical engineering International Science and Technology Cooperation Base of Eco-Chemical Engineering and Green ManufacturingCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong engineering Research center for Marine Environment corrosion and Safety Protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042China

Electrocatalytic cO_(2)reduction reaction(cO_(2)RR)in acidic media is a promising approach to overcome the unavoidable formation of carbonates in alkaline or neutral ***,the proton-rich environment near the catalyst surface favors hydrogen evolution reactions(HER),leading to lower energy efficiency of the desired products,especially in industrial-level current ***,quaternary ammonium cationic surfactant(cetyltrimethylammonium bromide(cTAB))was introduced into acidic electrolyte to modulate the interfacial microenvironment,which greatly enhanced cO_(2)electroreduction to formic acid(HcOOH)at the Bi/c nanoparticles *** a Bi/c nanoparticles electrode with cTAB added,constant production of formic acid was enabled with a cathodic energy efficiency of>40%and maximum FE_(HcOOH)(FE=Faradaic efficiency)of 86.2%at−400 mA·cm^(−2)over 24 *** with in-situ attenuated total reflection Fourier transform infrared spectroscopy,the concentration of*OcHO intermediates significantly increased after cTAB modification,confirming that the hydrophobic interface microenvironment formed by dynamic adsorption of positively charged long alkyl chains on Bi/c nanoparticle electrodes inhibited HER and improved the selectivity of cO_(2)RR to HcOOH.

关键词： acidic media cO_(2)electrolysis electrolyte additive hydrophobic interfacial microenvironment industrial-level current

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Fast-response,high-sensitivity multi-modal tactile sensors based on PPy/Ti_(3)c_(2)T_(x) films for multifunctional applications

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Nano Research 2024年第5期17卷 4410-4419页

作者： Guangshuai Xi Dongzhi Zhang Mingcong Tang Hao Zhang Yuehang Sun Yubiao Zhang Haolin cai Hui Xia Dandi Zhou college of control science and engineering China University of Petroleum(East China)Qingdao 266580China

In recent years,multi-modal flexible tactile sensors have become an important direction in the development of electronic skin because of their excellent sensitivity,flexibility and wearable *** this work,a humidity-pressure multi-modal flexible sensor based on polypyrrole(PPy)/Ti_(3)c_(2)T_(x) sensitive film packaged with porous polydimethylsiloxane(PDMS)is investigated by combining the sensitive structure generation mechanism of in situ polymerization to achieve the simultaneous detection of humidity and pressure,which has a sensitivity of 89,113.4Ω/%RH in a large humidity range of 0%-97%RH,and response/recovery time of 2.5/1.9 *** tactile pressure sensing has a high sensitivity,a fast response of 67/52 ms,and a wide detection *** device also has excellent performance in terms of stability and repeatability,making it promising for respiratory pattern and motion *** work provides a new solution to address the construction of multi-modal tactile sensors with potential applications in the fields of medical health,epidemic prevention.

关键词： multi-modal sensors humidity-pressure tactile sensors resistive sensors Ti3c2Tx human respiratory and motion detection

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convenient room-temperature synthesis of sulfur and nitrogen co-doped Nico-LDH coupled with cNTs on Nico foam as battery-type electrode for high performance hybrid supercapacitor

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Rare Metals 2024年第9期43卷 4286-4301页

作者： Li Song Xiao-Hong Zhong Fang-Lin Wang Zhi-Hui Huang Zhe Hong Yun-Fang Gao Hai-Dong Wang Jian-Wei Ren Sheng-Jie Peng Lei Li college of Biological Chemical Sciences and EngineeringJiaxing University college of chemical engineering Zhejiang University of Technology college of Materials science and Technology Nanjing University of Aeronautics and Astronautics Research and Development Department Jiangxi Ganfeng Li Energy Technology Co.Ltd. Department of Mechanical engineering science University of Johannesburg

The convenient synthesis of the composite electrode with high supercapacitance performance plays an important role in practical application but is ***, the carbon nanotubes（cNTs） coupled with lowcrystalline sulfur and nitrogen co-doped Ni co-LDH（denoted as SN-Ni co-LDH） nanosheets array are grown on Ni co foam（NcF） substrate by two convenient steps of metal induced self-assembly and corrosion engineering,which present the advantages of operating at roomtemperature and low preparation costs. Benefiting from the S–N co-doping and low-crystallinity of Ni co-LDH, the prepared SN-Ni co-LDH@cNTs@NcF electrode presents a topping charge capacity of 2470 c·g-1(4.94 c·cm-2) at 5 m A·cm-2. Furthermore, the fabricated asymmetry supercapacitor（ASc） achieves an extraordinary energy density of 77 Wh·kg-1(0.617 m Wh·cm-2) at a power density of 438 W·kg-1(3.5 m W·cm-2) and outstanding stability(91% capacity retention after 5000 cycles at20 m A·cm-2). Impressively, the structure evolution of Ni co-LDH during the charge/discharge processes has been thoroughly elucidated by in-situ Raman spectra. Therefore,this work verifies a powerful strategy and practical value for preparing composite electrodes with high supercapacitance performance, and also provides guidance for the rational design of the smart electrodes.

关键词： carbon nanotubes convenient synthesis Nico-LDH Sulfur and nitrogen co-doped Supercapacitor

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Synthesis of NO by rotating sliding arc discharge reactor with conical-spiral electrodes

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Plasma science and Technology 2024年第9期26卷 97-108页

作者： Bingyan cHEN Qi LIU Xu LI chunyang ZHANG Xiangbin GUO Qingzhou YU Zhicheng TANG Xiang HE Wei SU Yongfeng JIANG college of Mechanics and engineering science Hohai UniversityNanjing 211100People’s Republic of China college of Mechanical and Electrical engineering Hohai UniversityChangzhou 213200People’s Republic of China college of Materials science and engineering Hohai UniversityChangzhou 213200People’s Republic of China college of Information science and engineering Hohai UniversityChangzhou 213200People’s Republic of China

The present work investigates the potential applications of nitrogen oxides(NO_(x)),particularly nitric oxide(NO)and nitrogen dioxide(NO2),generated through discharge plasma in diverse sectors such as medicine,nitrogen fixation,energy,and environmental *** this study,a rotating sliding arc discharge reactor was initially employed to produce high concentrations of gaseous NO_(x),followed by the utilization of a molybdenum wire redox reactor for NO2-to-NO *** outcomes reveal that the discharge states and generations of NO_(x) are affected by varying parameters,including the applied energies,frequencies and airflow states(1.3-2.6 m/s are the laminar flow,2.6-5.2 m/s are the transition state,5.2-6.5 m/s are the turbulent flow),and the concentrations of NO_(x) within the arc discharge are higher than that in the spark ***,the concentrations of NO,NO2 and NO_(x) gradually increased,and the concentration ratios of NO/NO2 and NO_(x)/NO2 decreased with increasing the applied energy for one cycle from 14.8 mJ to 24.3 ***,the concentrations of NO,NO2 and NO_(x) gradually decreased,and the concentration ratios of NO/NO2 and NO_(x)/NO2 first decreased and then increased with increasing the applied frequencies from 5.0 kHz to 9.0 ***,the concentrations of NO,NO2 and NO_(x) gradually decreased,and the concentration ratios of NO/NO2 and NO_(x)/NO2 first increased and then decreased with increasing the air flow speeds from 1.3 m/s to 6.5 m/***,the concentrations of NO increased and NO2 decreased with increasing temperature from 25°c to 400°c using molybdenum *** findings provide experimental support for the application of plasma in the fields of medicine,nitrogen fixation,energy and environmental protection.

关键词： rotating sliding arc discharge NO_(x) synthesis of NO redox reaction

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Heterointerface engineering of rhombic Rh nanosheets confined on MXene for efficient methanol oxidation

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Journal of Energy chemistry 2024年第6期93卷 419-428,I0011页

作者： Qi Zhang Quanguo Jiang Xiang Yang chi Zhang Jian Zhang Lu Yang Haiyan He Guobing Ying Huajie Huang college of Materials science and engineering Hohai UniversityNanjing 210098JiangsuChina New Energy Technology engineering Lab of Jiangsu Province College of ScienceNanjing University of Posts&Telecommunications(NUPT)Nanjing 210023JiangsuChina School of Materials science and engineering Southeast UniversityNanjing 211100JiangsuChina

Although metallic rhodium(Rh)is regarded as a promising platinum-alternative anode catalyst of direct methanol fuel cell(DMFc),the conventional"particle-to-face"contact model between Rh and matrix largely limits the overall electrocatalytic performance due to their insufficient cooperative ***,we report a controllable and robust heterointerface engineering strategy for the bottom-up fabrication of rhombic Rh nanosheets in situ confined on Ti_3c_(2)T_x MXene nanolamellas(Rh NS/MXene)via a convenient stereoassembly *** unique design concept gives the resulting 2D/2D Rh NS/MXene heterostructure intriguing textural features,including large accessible surface areas,strong"face-toface"interfacial interactions,homogeneous Rh nanosheet distribution,ameliorative electronic structure,and high electronic *** a consequence,the as-prepared Rh NS/MXene nanoarchitectures exhibit exceptional electrocatalytic methanol oxidation properties in terms of a large electrochemically active surface area of 126.2 m~2 g_(Rh)~(-1),a high mass activity of 1056.9 mA mg_(Rh)-~1,and a long service life,which significantly outperform those of conventional particle-shaped Rh catalysts supported by carbon black,carbon nanotubes,reduced graphene oxide,and MXene matrixes as well as the commercial Pt nanoparticle/carbon black and Pd nanoparticle/carbon black catalysts with the same noble metal loading *** functional theory calculations further demonstrate that the direct electronic interaction at the well-contacted 2D/2D heterointerfaces effectively enhances the adsorption energy of Rh nanosheets and induces a left shift of the d-band center,thereby making the Rh NS/MXene configuration suffer less from cO *** work highlights the importance of rational heterointerface design in the construction of advanced noble metal/MXene electrocatalysts,which may provide new avenues for developing the next-generation DMFc devices.

关键词： Rhodium nanosheet Ti_(3)c_(2)T_(x)MXene Heterointerface Electrocatalyst Fuel cell

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Thermodynamic equilibrium theory-guided design and synthesis of Mg-doped LiFe_(0.4)Mn_(0.6)PO_(4)/c cathode for lithium-ion batteries

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Journal of Energy chemistry 2024年第4期91卷 619-627页

作者： Wei Lyu Wenlong cai Tuan Wang Xiaobo Sun Enhao Xu Jinxuan chen Kaipeng Wu Yun Zhang college of Materials science and engineering Sichuan UniversityChengdu 610064SichuanChina

Mn-rich LiFe_(1-x)Mn_(x)PO_(4)(x>0.5),which combines the high operation voltage of LiMnPO_(4)with excellent rate performa nce of LiFePO4,is hindered by its sluggish kinetic ***,thermodynamic equilibrium analysis of Mn^(2+)-Fe^(2+)-Mg^(2+)-c_(2)O_(4)^(2-)-H_(2)O system is used to guide the design and preparation of insitu Mg-doped(Fe_(0.4)Mn_(0.6))_(1-x)Mg_(x)c_(2)O_(4)intermediate,which is then employed as an innovative precursor to synthesize high-performance Mg-doped LiFe_(0.4)Mn_(0.6)PO_(4).It indicates that the metal ions with a high precipitation efficiency and the stoichiometric precursors with uniform element distribution can be achieved under the optimized thermodynamic ***,accelerated Li+diffusivity and reduced charge transfer resistance originating from Mg doping are verified by various kinetic *** from the contributions of inherited homogeneous element distribution,small particle size,uniform carbon layer coating,enhanced Li+migration ability and structural stability induced by Mg doping,the Li(Fe_(0.4)Mn_(0.6))_(0.97)Mg_(0.03)PO_(4)/c exhibits splendid electrochemical performance.

关键词： (Fe_(0.4)Mn_(0.6))_(1-x)Mgxc_(2)0_(4) precursors Thermodynami cequilibrium co-precipitation Mg doping Lithium-ion batteries

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Phenotypic Image Recognition of Asparagus Stem Blight Based on Improved YOLOv8

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computers, Materials & continua 2024年第9期80卷 4017-4029页

作者： Shunshun Ji Jiajun Sun chao Zhang college of Information science and engineering Shandong Agricultural UniversityTai’an271000China

Asparagus stem blight,also known as“asparagus cancer”,is a serious plant disease with a regional *** widespread occurrence of the disease has had a negative impact on the yield and quality of asparagus and has become one of the main problems threatening asparagus *** improve the ability to accurately identify and localize phenotypic lesions of stem blight in asparagus and to enhance the accuracy of the test,a YOLOv8-cBAM detection algorithm for asparagus stem blight based on YOLOv8 was *** algorithm aims to achieve rapid detection of phenotypic images of asparagus stem blight and to provide effective assistance in the control of asparagus stem *** enhance the model’s capacity to capture subtle lesion features,the convolutional Block AttentionModule(cBAM)is added after c2f in the ***,the original cIoU loss function in YOLOv8 was replaced with the Focal-EIoU loss function,ensuring that the updated loss function emphasizes higher-quality bounding *** YOLOv8-cBAM algorithm can effectively detect asparagus stem blight phenotypic images with a mean average precision(mAP)of 95.51%,which is 0.22%,14.99%,1.77%,and 5.71%higher than the YOLOv5,YOLOv7,YOLOv8,and Mask R-cNN models,*** greatly enhances the efficiency of asparagus growers in identifying asparagus stem blight,aids in improving the prevention and control of asparagus stem blight,and is crucial for the application of computer vision in agriculture.

关键词： YOLOv8 asparagus stem blight image recognition pest

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