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Late Triassic Magma Mixing and Fractional Crystallization in the Qingchengzi Orefield,Eastern liaoning Province:Regional Petrogenetic and Metallogenic Implications

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Journal of Earth Science 2021年第1期32卷 144-157页

作者： Hongjing Xie Yuwang Wang dedong li Guochao Zhou Zhichao Zhang Beijing Institute of Geology for Mineral Resources Beijing 100012China Deep Exploration Technic Center for Non-Ferrous Mines Beijing 100012China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China

The Qingchengzi orefield is an important Pb-Zn-Au-Ag polymetallic orefield in NE *** Indosinian magmatism has formed the Shuangdinggou batholith and the Xinling stock,as well as dikes of quartz monzonite porphyry and *** to petrographic characteristics,the Shuangdinggou intrusion can be divided into the main suite and the central *** U-Pb dat-ing yielded crystallization ages of 215.0-220.9 Ma for these various Qingchengzi magmatic units,which are within analytical error and represent coeval *** Shuangdinggou main suite contains abundant mafic microgranular enclaves(MMEs)and shows features of magma ***,the major oxide contents of the MMEs and their quartz monzonite host show well-defined linear frac-tionation *** REE and trace element patterns of the MMEs and their host are similar,which demonstrates certain degree of geochemical homogenization between the two during magma *** Shuangdinggou main suite shares similar geochemical characteristics with typical high Ba-Sr gra-nites(Ba=1082 ppm-2051 ppm,Sr=803 ppm-886 ppm),and was likely originated from the mixing between a melt derived from partial melting of the thickened lower crust and the enriched *** central suite was likely formed by fractional crystallization of the main-suite *** Xinling in-trusion may represent a branch of the Shuangdinggou intrusion and has the same genesis as the central *** quartz monzonite porphyries geochemically mimic the Shuangdinggou main suite,and may also be an epioic facies of the Shuangdinggou *** MMEs and lamprophyres may have been derived from incomplete magma *** of the Pb-Zn and Au-Ag deposits in the Qing-chengzi orefield may have been related to the granite/quartz monzonite porphyries near the Shuangdinggou intrusion,which were formed by magma mixing and fractional crystallization.

关键词： Qingchengzi orefield Shuangdinggou intrusion magma mixing mafic microgranular enclave(MME) fractional crystallization

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Petrogenesis and Economic Potential of the Sangong MaficUltramafic Intrusion in the Eastern Tianshan, Central Asian Orogenic Belt: Constraints from Mineral, Whole-Rock, and PGE Geochemistry

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Journal of Earth Science 2024年第3期35卷 850-865页

作者： Guochao Zhou Yuwang Wang Jingbin Wang Yu Shi Hongjing Xie dedong li Yong Fu Pan Wu College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550012China Technic Research Center for Deep Resources Exploration in Non-ferrous Metal Mines Beijing Institute of Geology for Mineral Resources Co.Ltd.Beijing 100012China Sino-Zijin Resources Ltd. Beijing 100012China State Key Laboratory of Nuclear and Environment East China University of TechnologyNanchang 330013China

The Sangong Cu-Ni sulfide mineralized mafic-ultramafic intrusion is located on the southern margin of the Bogeda-Harlik belt,eastern Tianshan,*** intrusion is a well-differentiated complex and is comprised of leucogabbro,gabbro,olivine gabbro,Pl-bearing peridotite,and Pl-bearing *** Pl-bearing pyroxenite hosts both irregularly disseminated sulfide and round droplet *** intrusive rocks have a wide range of SiO_(2)(42.1 wt.%-50.48 wt.%)and MgO(6.21 wt.%-22.11 wt.%),and are enriched in light rare earth elements(LREE),large-ion lithophile elements(liLE;e.g.,Rb,Ba,Sr,and Pb),and palladium platinum group elements(PPGE)but depleted in high-field-strength elements(HFSE;e.g.,Nb,Ta,and Ti)and iridium PGEs(IPGE).These geochemical characteristics indicate that the Sangong mafic-ultramafic intrusion was derived from high degree of partial melting of depleted mantle and interacted with subduction-related *** low Pd/Ir(3.21-27.44)but high Ni/Cu(1.64-24.16)ratios,combined with the olivine crystals with low Fo(60.88-78.65)and Ni(54.99 ppm-1688.87 ppm)concentrations suggest that the parental magma of the Sangong intrusion were likely high MgO basaltic in composition that experienced extensive evolution prior *** Ce/Pb ratios(5.8-13.6)and Nb/U ratios(11.6-30.3)of the intrusive rocks all range between MORB and crustal values,the Nb/Yb and Th/Yb values are close to the lower crust values,together with the low Se/S ratios[(17-100)×10^(-6))]suggest that the magma experienced assimilation not only in mantle source but also in conduit,but the degree of crustal contamination is *** Cu/Pd ratios of the rocks range from 3.9×10^(4) to 10.8×10^(4),and the Cu/Zr ratios of Pl-bearing pyroxenite in the Sangong intrusion are>1,combined with the presence of sulfide droplets in the Pl-bearing pyroxenite,indicating the parental magma experienced sulfide saturation and the economical ore bodies may present in the depth of the ***,gi

关键词： Sangong mafic-ultramafic intrusion deposits geochemistry PGE economic potential eastern Tianshan.

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Minimum critical thickness of dike for ore-bearing fluid injection:A new approach applied to the Shihu gold deposit,Hebei Province,North China

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Geoscience Frontiers 2012年第5期3卷 717-728页

作者： dedong li Yuwang Wang Jingbin Wang Zhaohua Luo Jiulong Zhou Zongfeng Yang Cui liu Beijing Institute of Geology for Mineral Resources Beijing 100012 China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China

According to the metallogenic theory by transmagmatic fluid （TMF）, one magmatic intrusion is a channel of ore-bearing fluids, but not their source. Therefore, it is possible to use TMF＇s ability for injection into and for escaping t^om the magmatic intrusion to evaluate its ore-forming potential. As the ore-bearing fluids cannot effectively inject into the magmatic intrusion when the magma fully crystal- lized, the cooling time and rates viscosity varied can be used to estimate the minimum critical thickness of the intrusion. One dimensional heat transfer model is used to determine the cooling time for three representative dikes of different composition （granite porphyry, quartz diorite and diabase） in the Shihu gold deposit. It also estimated the rates viscosity varied in these time interval. We took the thickness of dike at the intersection of the cooling time -- thickness curve and the rates viscosity varied versus thick- ness curve as the minimum critical thickness. For the ore-bearing fluids effectively injecting into the magma, the minimum critical thicknesses for the three representative dikes are 33.45 m for granite porphyry, 8.22 m for quartz diorite and 1.02 m for diabase, indicating that ore-bearing dikes must be thicker than each value. These results are consistent with the occurrence of ore bodies, and thus they could be applied in practice. Based on the statistical relationship between the length and the width of dikes, these critical thicknesses are used to compute critical areas： 0.0003--0.0016 km2 for diabase, 0.014--0.068 km2 for quartz diorite and 0.011-0.034 km2 for granite porphyry. This implies that ore- bearing minor intrusions have varied areas corresponding to their composition. The numerical simulation has provided the theoretical threshold of exposed thickness and area of the ore-bearing intrusion. These values can be used to determine the ore-forming potentials of dikes.

关键词： Dike swarm Cooling time Numerical simulationMinor intrusion Critical thickness Transmagmatic fluid

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Petrogenesis and Metallogenesis of the Niumaoquan Gabbroic Intrusion Associated with Fe-Ti Oxide Ores in the Eastern Tianshan, NW China

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Acta Geologica Sinica(English Edition) 2018年第5期92卷 1862-1878页

作者： SHI Yu WANG Yuwang WANG Jingbin XIE Hongjing MAO Qigui ZHAO Lutong LONG lingli li dedong ZHOU Guochao Beijing Institute of Geology for Mineral Resources Beijing 100012 China School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China

The Niumaoquan layered gabbroic intrusion is in the southern margin of the Central Asian Orogenic Belt in North Xinjiang, China, and hosts a Fe-Ti oxide deposit in its evolved gabbroic phases. In this paper, we report zircon U-Pb age, Sr-Nd-Hf isotopes, plagioclase chemistry, and whole-rock geochemistry of the Niumaoquan layered gabbroic intrusion. Zircon grains separated from an anorthosite sample analyzed by laser ablation inductively coupled plasma mass spectrometry yielded a concordia age of 314.7±0.74 Ma, indicating that the Niumaoquan ore-bearing gabbroic intrusion was emplaced during the Late Carboniferous. The olivine gabbro texture and plagioclase chemistry suggest that plagioclase was an early crystallized silicate phase that crystallized prior to olivine. Fractional crystallization and accumulation of plagioclase significantly controlled the evolution of the Niumaoquan gabbroic intrusion and contributed to the formation of anorthosite layers, causing metallogenic elements to become enriched in the residual melt. The Niumaoquan gabbroic intrusion is characterized by the enrichment of large ion lithophile elements and depletion of high field strength elements, positive zircon εHf（t） values（＋2.1 to ＋12.2）, positive εNd（t） values（＋3.3 to ＋5.2）, and low initial ^（87）Sr/^（86）Sr ratios（0.7039 to 0.7047）, suggesting that the parental magma was produced by interactions between metasomatized lithospheric mantle and depleted asthenospheric melts at an early post-collision stage. The Fe-Ti oxide mineralization of the Niumaoquan intrusion benefited from interactions between depleted asthenospheric melts and lithospheric mantle, and fractional crystallization of abundant plagioclase and magnesian minerals.

关键词： anorthosite chronology Fe-Ti oxide Niumaoquan Eastern Tianshan

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Artificial Intelligence Identification of Multiple Microfossils from the Cambrian Kuanchuanpu Formation in Southern Shaanxi, China

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Acta Geologica Sinica(English Edition) 2020年第1期94卷 189-197页

作者： ZHANG Tao WANG Bin li dedong NIU Ben SUN Jie SUN Yifei YANG Xiaoguang LUO Juan HAN Jian School of Information Science&Technology Northwest University.Chang’an DistrictXi’an 710075China Shaanxi Key Laboratory of Early life and Environmensts State Key Laboratory of Continental DynamicsDepartment of GeologyNorthwest UniversityXi’an 710069China

The Cambrian Kuanchuanpu Formation in southern Shaanxi, China is a critical window for the understanding of the Cambrian explosion, because of abundant and various exceptionally preserved metazoans and embryo fossils yielded. The efficiency of traditional sample manually selecting with microscopes is quite low and hinder the discoveries of new species, thus recognition and classification of microfossils by artificial intelligence(AI) is substantially in the request. In this paper, we develop a procedure for fossil area segmentation in common multi-typed mixed photos by improved watershed algorithm. And for better fossil recognition, previous histogram of oriented grandient(HOG) algorithm is replaced by scale invariant feature transform(SIFT), which is feasible for the segmented images and increase the accuracy significantly. Thus, the scope of application of AI fossil recognition can be extended form single fossil image to multi-typed mixed images and the reliability is also secured, as the result of our test presents a high(at least 84%) accuracy of fossil recognition.

关键词： watershed segmentation scale invariant feature transform visual vocabulary support vector machine

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Physicochemical Control of the Early Permian Xiangshan Fe-Ti Oxide Deposit in Eastern Tianshan(Xinjiang),NW China

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Journal of Earth Science 2018年第3期29卷 520-536页

作者： Yu Shi Yuwang Wang Jingbin Wang Lutong Zhao Hongjing Xie lingli Long Tao Zou dedong li Guochao Zhou Beijing Institute of Geology for Mineral Resources Beoing 100012China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Faculty of Land Resource Engineering Kunming University of Science and TechnologyKunming 650093China

The Xiangshan mafic-ultramafic complex is one of the major Early Permian maficultramafic intrusions in eastern Tianshan （Xinjiang, NW China）, and consists of two major intrusive phases. The first intrusive phase is mainly gabbroic rocks hosting ilmenite mineralization, while the second intrusive phase is mainly lherzoilite associated with Ni-Cu sulfide mineralization. The Xiangshan ilmenite orebodies hosted in the Fe-Ti oxide-bearing gabbro occur along the contact between hornblende gabbros and leucogabbros. The hornblende gabbros and Fe-Ti oxide rich gabbros at Xiangshan are newly dated to be Early Permian （280.1 and 279.2 Ma, respectively）. Major and trace element compositions of zircons and whole rocks from Xiangshan hornblende gabbro and Fe-Ti oxide gabbro have been measured by in situ excimer laser ablation ICP-MS. Zircon Ce^4＋/Ce^3＋ ratios based on lattice-strain model and Ti-in-zircon temperatures of hornblende gabbro and Fe-Ti oxide gabbro of the Xiangshan complex are calculated to evaluate the physicochemical variations during the ilmenite mineralization. Whole-rock geochemistry and zircon trace element geochemistry suggest that Fe-Ti oxide gabbros were formed from a basaltic parent magma which had undergone a transfromation from being H2O-rich to H2O-poor. During the magmatic evolution, primitive, HEO-poor basaltic melts may have been replenished into the system, increasing its solidus temperature and decreasing its oxygen fugacity and H2O contents. This may have supperessed the Ti-rich poikilitic hornblende fractionation and promoted the plagioclase fractionation, which consequently concentrated the ore-forming components in the residual melts and generated the ilmenite mineralization.

关键词： eastern Tianshan magmatic Fe-Ti oxide deposits gabbros layered intrusion zircon U-Pb age geochemistry.

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The speciation equilibrium coupling with phase equilibrium in the H2O-CO2-NaCl system from 0 to 250℃,from 0 to 1000 bar,and from 0 to 5 molality of NaCl

The speciation equilibrium coupling with phase equilibrium i...

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中国科学院地质与地球物理研究所2007学术年会

作者： dedong li,Zhenhao Duan State Key Laboratory of lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China

A model is developed for the calculation of the speciation equilibrium of H,OH,HCO,CO,and CO2(aq)) in aqueous solutions coupled with liquid-vapor phase equilibrium in the CO-HO-NaCl system from 273 to 523 K,from 0 to 1000 bar (possibly to 2000 bar),and from 0 to 5.0 molality(m) of *** first and second ionization constants of carbonic acid,pH values in aqueous solutions,and their dependence on temperature(T),pressure(P) and NaCl concentrations can be calculated with accuracy close to those of experiments in the stated T-P-m *** the specific ion-interaction equations of Pitzer to calculate activity coefficients,the model is also able to accurately predict the difference between dissociation constants and apparent dissociation constants,and the concentrations of H,OH,HCO,CO,and CO2(aq)) at a given T-P-m condition. Compared to previous models,this model covers larger T-P-m space and much more closely reproduces experimental results, especially in the elevated pressure *** without fitting to the experimental data for pH values,dissociation constants and apparent dissociation constants at pressures above the saturation pressures of pure water,this model can accurately predicted these properties up to high pressures.A computer program based on this model is developed and online calculation is made available at: ***/***.

关键词： CO2 Aqueous carbonate system pH Speciation ecuilibrium Ionization constant CO2-H2O CO2-H2O-NaCl

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Modeling the sea clutter data through wavelet multi-resolution analysis

Modeling the sea clutter data through wavelet multi-resoluti...

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2006北京地区高校研究生学术交流会

作者： Wang Yongsheng Jiang Wenzhi li dedong Yuan Shengzhi Department of Science and Technology of Weapons, Naval Aeronautical Engineering Institute, Yantai 264001,China

The wavelet transform was proposed to statistically analysis sea clutter data in this paper. When modeling the real sea clutter data, the wavelet multi-resolution analysis was used to estimate the sea clutter’s probability density curve firstly, then the distribution and its parameters were acquired by fitting the estimated PDF curve The method changed the formerly modeling method which assumed the sea clutter distribution type beforehand, and overcome the inaccurate shortcoming that estimating distribution parameters directly using the sea clutter data because of the noise. Through adjusting the threshold of MRA, our method can be used to analysis sea clutter in all kinds of sea conditions.

关键词： sea clutter multi-resolution analysis probability density function

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MgO掺杂铌酸钾钠基晶体材料的制备、结构及性能

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硅酸盐学报 2020年第6期48卷 913-918页

作者：许亚萍江民红李玲娜李德东李林饶光辉桂林电子科技大学材料科学与工程学院广西信息材料重点实验室广西桂林541004

采用无籽固相晶体生长法制备MgO掺杂的K0.5Na0.5NbO3基无铅压电单晶。采用X射线衍射仪、扫描电子显微镜和压电铁电测试仪等研究了MgO掺杂对K0.5Na0.5NbO3基晶体的生长、微结构和压电铁电性能的影响。结果表明:添加MgO后,仍可采用无籽固... 详细信息

采用无籽固相晶体生长法制备MgO掺杂的K0.5Na0.5NbO3基无铅压电单晶。采用X射线衍射仪、扫描电子显微镜和压电铁电测试仪等研究了MgO掺杂对K0.5Na0.5NbO3基晶体的生长、微结构和压电铁电性能的影响。结果表明:添加MgO后,仍可采用无籽固相晶体生长法制备出K0.5Na0.5NbO3基单晶;MgO的加入没有明显改变K0.5Na0.5NbO3基单晶的晶体结构,MgO溶入铌酸钾钠晶格形成了均匀的固溶体;适量MgO的添加有利于提高K0.5Na0.5NbO3基单晶的压电和铁电性能、降低介电损耗,当MgO的掺杂量为0.6%(质量分数)时,K0.5Na0.5NbO3基单晶的压电常数d33=203 pC/N,介电损耗tanδ=0.028,介电常数ε=221,矫顽电场Ec=7 kV/cm,剩余极化强度Pr=36.5μC/cm^2。

关键词：铌酸钾钠压电单晶氧化镁掺杂铁电压电性能无籽固相晶体生长

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Coupled phase and aqueous species equilibrium of the H2O-CO2-NaCl-CaCO3 system from 0 to 250℃,1 to 1000 bar with NaCl concentrations up to saturation of halite

Coupled phase and aqueous species equilibrium of the H2O-CO2...

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中国科学院地质与地球物理研究所2008学术年会

作者： Zhenhao Duan~*,dedong li Key Laboratory of the Earth’s Deep Interior,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

A model is developed for the calculation of coupled phase and aqueous species equilibrium in the HO-CO-NaCl-CaCO system from 0 to 250℃,1 to 1000 bar with NaCl concentrations up to saturation of *** vapor-liquid-solid(calcite, halite) equilibrium together with the chemical equilibrium of H,Na,Ca,CaHCO,Ca(OH),OH,Cl,HCO, CO,CO2(aq)) and CaCO3(aq)) in the aqueous liquid phase as a function of temperature,pressure,NaCl concentrations, CO2(aq)) concentrations can be calculated,with accuracy close to those of experiments in the stated T-P-m range,hence calcite solubility,CO gas solubility,alkalinity and pH values can be accurately *** merit and advantage of this model is its predictability,the model was generally not constructed by fitting experimental data. One of the focuses of this study is to predict calcite solubility,with accuracy consistent with the works in previous experimental *** resulted model reproduces the following:(1) as temperature increases,the calcite solubility *** example,when temperature increases from 273 to 373 K,calcite solubility decreases by about 50%;(2) with the increase of pressure,calcite solubility *** example,at 373 K changing pressure from 10 to 500 bar may increase calcite solubility by as much as 30%;(3) dissolved CO can increase calcite solubility substantially;(4) increasing concentration of NaCl up to 2 m will increase calcite solubility,but further increasing NaCl solubility beyond 2 m will decrease its solubility. The functionality of pH value,alkalinity,CO gas solubility,and the concentrations of many aqueous species with temperature, pressure and NaCl(aq)) concentrations can be found from the application of this *** calculation is made available on ***/models/h2oo2aclaco3/***.

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