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Geochronology and Ore Genesis of the Niujuan-Yingfang Pb-Zn-Ag Deposit in Fengning,Northern North China Craton:Constraints from Fluid Inclusions,H-O-S Isotopes and Fluorite Sr-Nd Isotopes

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Journal of Earth Science 2021年第1期32卷 81-102页

作者： Xiang Yan Bin Chen xiaoxia duan Zhiqiang Wang School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China Ore Deposit and Exploration Centre(ODEC) Hefei University of TechnologyHefei 230009China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055China

The Niujuan-Yingfang Pb-Zn-Ag deposit in northern North China Craton(NCC)is hosted at the contact zone between Permian biotite monzogranite and Hongqiyingzi Group migmatitic *** orebodies are structurally controlled by NE-trending F1 *** can be divided into three stages:(1)siliceous-chlorite-pyrite stage,(2)quartz-Ag-base metal stage,and(3)fluorite-calcite *** types of fluid inclusions were identified,including:(1)liquid-rich aqueous inclusions,(2)vapor-rich inclusions,(3)liquid-rich,solid-bearing inclusions,and(4)CO2-bearing ***-crothermometric measurements reveal that from stage I to III,the homogenization temperatures range from 317 to 262℃,from 297 to 192℃,and from 248 to 151℃,respectively,and the fluid salinities are in the ranges from 1.1 wt.%to 6.5 wt.%,1.2 wt.%to 6.0 wt.%and 0.7 wt.%to 4.0 wt.%NaCl equiva-lents,*** boiling and cooling are the two important mechanisms for ore precipitation according to microthermometric data,and fluid-rock interaction is also *** Raman spectroscopic analyses indicate the fluid system of the deposit is composed of CO2-NaCl-H2O±***-tallogenic fluorites yielded a Sm-Nd isochron age of 158±35 ***δ34SV-CDt values of sulfides range from-1.3‰ to 6.3‰,suggesting that the sulfur may be inherited from the basement metamorphic ig-neous *** and oxygen isotopic compositions of quartz indicate a metamorphic origin for the ore-forming fluid,and the proportion of meteoric water increased during the ore-forming ***-Nd isotopes of fluorites show a crustal source for the ore-forming fluid,with primary metamorphic fluid mixed with meteoric water during ascent to lower crustal *** with the geological,metallogenic epoch,fluid inclusions,H-O-S and Sr-Nd isotopes characteristics of the deposit,we suggest that the Niujuan-Yingfang deposit belongs to the medium-low temperature hydrothermal vein-type Pb-Zn-Ag polymetallic deposit,with ore-formin

关键词： fluid inclusion geochronology H-O-S isotopes fluorite Sr-Nd isotopes Niujuan-Yingfang Pb-Zn-Ag deposit NCC

Numerical simulation of micro-mixing in gas–liquid and solid–liquid stirred tanks with the coupled CFD-E-model

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2235-2247页

作者： xiaoxia duan Xin Feng Chong Peng Chao Yang Zaisha Mao CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China SINOPEC Dalian Research Institute of Petroleum and Petrochemicals Dalian 116045China

The coupled CFD-E-model for multiphase micro-mixing was developed,and used to predict the micro-mixing effects on the parallel competing chemical reactions in semi-batch gas–liquid and solid–liquid stirred *** on the multiphase macro-flow field,the key parameters of the micro-mixing E-model were obtained with solving the Reynolds-averaged transport equations of mixture fraction and its variance at low computational *** with experimental data,the multiphase numerical method shows the satisfactory predicting *** the gas–liquid system,the segregated reaction zone is mainly near the feed point,and shrinks to the exit of feed-pipe when the feed position is closer to the ***,surface feed requires more time to completely exhaust the added H+solution than that of impeller region feed at the same operating *** the solid–liquid system,when the solid suspension cloud is formed at high solid holdups,the flow velocity in the clear liquid layer above the cloud is notably reduced and the reactions proceed slowly in this almost stagnant ***,the segregation index in this case is larger than that in the dilute solid–liquid system.

关键词： Stirred tank Engulfment model(E-model) Multiphase flow Micro-mixing Computational fluid dynamics(CFD) Simulation

Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank

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Chinese Journal of Chemical Engineering 2022年第2期35卷 351-363页

作者： Huina Wang xiaoxia duan Xin Feng Zai-Sha Mao Chao Yang CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The main spatial distribution features of shear rate in a stirred tank operated with five different radial and axial flow impellers were presented with particle image velocimetry(PIV)*** only the average shear rate in the whole tank but also the local value in the vicinity of impeller increases linearly with impeller ***,the shear coefficient(Ks,imp)at the impeller outlet is linearly related to the impeller flow number(Nq)and decreases with the increase of Nq in general at the constant power consumption per unit volume(Pv).During scale-up based on the constant Pv and geometric similarity,CFD results show that the volume-averaged shear rate(cavg)for RDT decreases faster than that of other impellers with the impeller tip velocity(Utip).The novel multi-blade combined(MBC)impeller with the increased height-to-diameter ratio of the stirred tank is able to more effectively improve the distribution uniformity of shear rate at the same Pv after *** studies provide a data basis for selecting the impeller types and improving the shear rate environment in the large-scale stirred tank.

关键词： Particle image velocimetry Shear rate distribution Constant power consumption per unit volume Computational fluid dynamics Scale-up

Study on water treatment effect of dispersion discharge plasma based on flowing water film electrode

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Plasma Science and Technology 2021年第10期23卷 168-178页

作者： Wenzheng Liu Ying Bao xiaoxia duan Jian Zhang School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044People's Republic of China School of Science Beijing Jiaotong UniversityBeijing 100044People's Republic of China Yangtze Normal University Chongqing 408100People's Republic of China

To improve the utilization rate of plasma active species,in this study,a closed non-uniform air gap is formed by a flowing water film electrode and a sawtooth insulating dielectric layer to realize the diffuse glow discharge in the ***,the electric field distribution characteristics of non-uniform air gap in the sawtooth dielectric layer are studied,and the influence of aspect ratio on the characteristics of diffuse discharge plasma is ***,the effects of wire mesh,the inclination angle of the dielectric plate,and liquid inlet velocity on the flow characteristics of the water film electrode are *** results show that the non-uniform electric field distribution formed in the sawtooth groove can effectively inhibit the filamentous discharge,and the 1 mm flowing water film is directly used as the electrode,and high-active plasma is formed directly on the lower surface of the water *** addition,a plasma flowing water treatment device is built to treat the methyl orange solution and observe its decolorization *** experimental results show that after 50 min of treatment,the decolorization rate of the methyl orange solution reaches 96%,which provides a new idea for industrial applications of wastewater treatment.

关键词： water film electrode dispersive glow discharge plasma inhomogeneous electric field closed discharge space flowing water treatment

CFD simulation of flow and mixing characteristics in a stirred tank agitated by improved disc turbines

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Chinese Journal of Chemical Engineering 2022年第10期50卷 95-107页

作者： Zhuotai Jia Lele Xu xiaoxia duan Zai-Sha Mao Qinghua Zhang Chao Yang CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China School of Chemical Engineering Nanjing Tech UniversityNanjing 211816China

To reduce the power consumption and improve the mixing performance in stirred tanks,two improved disc turbines namely swept-back parabolic disc turbine(SPDT)and staggered fan-shaped parabolic disc turbine(SFPDT)are *** validation of computational fluid dynamics(CFD)model with experimental results,CFD simulations are carried out to study the flow pattern,mean velocity,power consumption,pumping capacity and mixing efficiency of the improved and traditional impellers in a dished-bottom tank under turbulent flow conditions,The results indicate that compared with the commonly used parabolic disc turbine(PDT),the power number of proposed SPDT and SFPDT impellers is reduced by 43%and 12%,and the pumping efficiency is increased by 68%and 13%,***,under the same power consumption(0-700 W·m^(-3)),the mixing performance of both SPDT and SFPDT is also superior to that of Rushton turbine and PDT.

关键词： Flow regime Mixing time Stirred vessel Computational fluiddynamics Improved discturbine

Petrogenesis of the Yangchang Mo-bearing granite in the Xilamulun metallogenic belt,NE China:geochemistry,zircon U-Pb ages and Sr-Nd-Pb isotopes

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Petrogenesis of the Yangchang Mo-bearing granite in the Xila...

华北克拉通北缘牛圈银矿区两期A型花岗岩的成因及其构造意义

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： QINGDONG ZENG JINHUI YANG ZUOLUN ZHANG JIANMING LIU xiaoxia duan Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences

The Yangchang granite-hosted Mo deposit is typical of the Xilamulun metallogenic belt,which is one of the important Mo-Pb-Zn-Ag producers in China.A combination of major and trace element Sr,Nd and Pb isotope,and zircon U-Pb age data are reported for the Yangchang batholith to constrain its petrogenesis and Mo *** LA-ICPMS U-Pb dating yields mean ages of 138 ±2 and 132 ± 2 Ma for monzogranite and granite porphyry,*** monzogranites and granite porphyries are calc-alkaline with KO/NaO ratios of 0.75-0.92 and 1.75-4.42,*** are all enriched in large-ion hthophile elements(LILEs) and depleted in high-field-strength elements(HFSEs) with negative Nb and Ta anomalies in primitive-mantle-normalized trace element *** monzogranites have relatively high Sr(380-499 ppm)and Y(14-18ppm) concentrations,and the granite porphyries have lower Sr(31-71 ppm) and Y(5-11 ppm) concentrations than those of *** monzogranites and granite porphyries have relatively low initial Sr isotope ratios of 0.704573-0.705627 and0.704281,respectively,and similar Pb/Pb ratios of 18.75-18.98 and 18.48-18.71,*** contrast,the ε(t) value(-3.7) of granite porphyry is lower than those of monzogranites(—1.5 to —2.7) with Nd model ages of about 1.0 *** geochemical features suggest that the monzogranite and granite porphyries were derived from juvenile crustal rocks related to subduction of the Paleo-Pacific plate under east China.

关键词： Yangchang granite Xilamulun metallogenic belt U-Pb zircon age Sr-Nd-Pb isotopes juvenile crust subduction of Paleo-Pacific plate

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岩石学报 2019年第2期35卷 558-588页

作者：严翔陈斌王志强段晓侠合肥工业大学资源与环境工程学院合肥230009 南方科技大学地球与空间科学系深圳518055

西伯利亚板块和华北克拉通之间的古亚洲洋最终消减闭合的时间问题一直存在很大的争议,对区域内A型花岗岩的研究可以为该问题的解决提供有效约束。本文详细研究了华北克拉通北缘牛圈银矿区及其外围出露的海西期A型花岗岩和相关的暗色镁... 详细信息

西伯利亚板块和华北克拉通之间的古亚洲洋最终消减闭合的时间问题一直存在很大的争议,对区域内A型花岗岩的研究可以为该问题的解决提供有效约束。本文详细研究了华北克拉通北缘牛圈银矿区及其外围出露的海西期A型花岗岩和相关的暗色镁铁质微粒包体及辉绿岩脉的地质年代学和地球化学特征,以期解释其岩石成因并讨论构造指示意义。牛圈银矿区的花岗岩主要包括中粗粒黑云母二长花岗岩和细粒钾长花岗岩,锆石U-Pb定年结果表明中粗粒黑云母二长花岗岩和细粒钾长花岗岩分别形成于268.7±3.2Ma和254.2±2.8Ma,基性辉绿岩脉则形成于267.6±3.9Ma,与矿区早期中粗粒黑云母花岗岩几乎同时代或略晚。矿区两期花岗岩都具有弱过铝质特征,属于高钾钙碱性-钾玄岩系列岩石,均以高SiO_2、富碱、高FeO^T/(FeO^T+MgO)和Ga/Al比值;贫CaO、MgO、TiO_2、P_2O_5;富集Rb、Th、U、Y、F而亏损Ba、Sr、P、Ti、Eu等为特征,结合矿物学特征(半自形石英、他形铁质黑云母、出现条纹长石、缺乏碱性暗色矿物等)表明它们均为铝质A_2型花岗岩。这也得到了较高的全岩锆石饱和温度(T_(Zr))的支持,中粗粒黑云母二长花岗岩和细粒钾长花岗岩的岩浆结晶温度分别为784～822℃(平均值805℃)和843～871℃(平均值856℃)。中粗粒黑云母二长花岗岩中广泛发育镁铁质暗色包体。本文认为牛圈中粗粒黑云母二长花岗岩为古元古界红旗营子群基底杂岩中的花岗质片麻岩为主的中下地壳物质部分熔融,并与幔源基性岩浆发生岩浆混合作用形成的。年代学、主微量元素及Sr-Nd同位素数据表明,牛圈细粒钾长花岗岩与中粗粒黑云母二长花岗岩不是同一岩浆房演化的产物,而是代表两期岩浆活动,且晚期细粒钾长花岗岩形成过程中地幔物质添加相对更多。通过对牛圈银矿区两期A型花岗岩的研究,结合前人关于华北克拉通北缘中二叠世碱性岩浆岩带的研究,本文认为华北北缘在中二叠世伊始(～270Ma)就已经发生构造体制转换并进入后造山伸展环境,古亚洲洋的最终闭合可能早于270Ma。从牛圈早期中粗粒黑云母二长花岗岩到晚期细粒钾长花岗岩的相继侵位,伴随着更多的地幔物质的加入,其A型花岗岩特征愈发明显,指示华北北缘被破坏大陆边缘越来越强烈的伸展作用。

关键词：华北克拉通北缘牛圈银矿 A型花岗岩暗色镁铁质微粒包体岩浆混合后碰撞伸展

Geochronology,geochemistry and Hf isotope of Late Triassic magmatic rocks of Qingchengzi district in Liaodong peninsula,Northeast China

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Geochronology,geochemistry and Hf isotope of Late Triassic m...

Mesozoic molybdenum deposits in the East Xingmeng orogenic belt,northeast China:characteristics and tectonic setting

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： xiaoxia duan Qingdong Zeng Jinhui Yang Jianming Liu Yongbin Wang Lingli Zhou Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

The initiation timing and mechanism of lithospheric thinning of the North China Craton(NCC) was still *** Triassic igneous rocks especially mantle derived mafic rocks would provide constrains on Early Mesozoic lithospheric mantle geodynamics and initiation of lithospheric *** paper reports Late Triassic magmatic rocks,including lamprophyre,diorite dykes and biotite monzogranite cropped out in Qingchengzi district of Liaodong peninsula,northeastern ***-ICPMS zircon U-Pb dating yield ages of 210-227 Ma and 224 Ma for lamprophyres and biotite monzogranite *** is ultrapotassic,strongly enriched in REE and LILEs,depleted in HFSEs,and negative Hf isotopes,which are discriminating signatures of crustal source,but distinguishingly high compatible element contents indicate the primary magma originated from mantle source—a fertile *** derived from partial melting of an enriched lithospheric mantle,which was modified by slab-derived hydrous fluids/melts associated with deep subduction between the Yangtze Craton and the *** diorite displays distinct features with relatively enriched Nb,Ta,HREE and depleted Th,U,which suggest it derived from a relatively depleted *** depletion was caused by break-off of the Yangtze slab during deep subduction introducing asthenospheric mantle into the *** biotite monzogranite shows adakitic affinity,and originated from partial melting of the thickened lower crust with addition of small proportion of mantle *** recognition of Late Triassic magmatism implies extensional tectonic settings in Liaodong peninsula and suggests initiation of lithospheric thinning of North China Craton in eastern segment might begin early in Late Triassic.

关键词： LA-ICPMS U-Pb dating Geochemistry Late Triassic magmatism Qingchengzi district North China Craton

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Mesozoic molybdenum deposits in the East Xingmeng orogenic b...