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Ore-forming Fluid and Metallogenic Mechanism of Wolframite-Quartz Vein-type Tungsten Deposits in South China

Acta Geologica Sinica(English Edition) 2020年第6期94卷 1774-1796页

作者： ni pei LI Wensheng PAN Junyi State Key Laboratory for Mineral Deposits Research Institute of Geo-FluidsSchool of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China

South China is endowed with copious wolframite-quartz vein-type W deposits that provide a significant contribution to the world‘s tungsten *** is spatially associated with highly evolved granites,which have been interpreted as products of ancient crustal *** veins are mainly hosted in low-grade metamorphosed quartz sandstone,slate and granitic *** ore minerals mainly comprise wolframite,cassiterite,scheelite and pyrite,with minor molybdenite,arsenopyrite and *** steeply dipping veins can be divided into five zones from top to the bottom,namely:(Ⅰ)thread,(Ⅱ)veinlet,(Ⅲ)moderate vein,(Ⅳ)thick vein,and(Ⅴ)thin out *** general,three types of fluid inclusions at room temperature are commonly recognized in wolframite and/or quartz from these veins:two-phase liquid-rich(type L),two-phase CO2-bearing(type CB),and CO2-rich(type C).Comparative microthermometry performed on fluid inclusions hosted in wolframite and associated quartz indicates that most wolframite was not coprecipitated with the coexisting *** petrographic observation and cathodoluminescence(CL)imaging on coexisting wolframite and quartz of the Yaogangxian deposit,show repeated precipitation of quartz,wolframite,and muscovite,suggesting a more complex fluid process forming these *** studies of H-O isotopes and fluid inclusions suggested that the main ore-forming fluids forming the wolframite-quartz vein-type deposits had a magmatic source,whereas an unresolved debate is centered on whether mantle material supplemented the ore-forming *** variable CO2 contents in the ore-forming fluids also implies that CO2 might have had a positive effect on ore *** inclusion studies indicate that wolframite was most likely deposited during cooling from an initial H2 O+Na Cl±CO2 magmatic *** addition,fluid-phase separation and/or mixing with sedimentary fluid might also have played an important role in promoting wolframite de

关键词： metallogeny wolframite-quartz vein fluid inclusions microthermometry Nanling region

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CRISPR-mediated acceleration of wheat improvement:advances and perspectives

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Journal of Genetics and Genomics 2023年第11期50卷 815-834页

作者： Ximeng Zhou Yidi Zhao pei ni Zhongfu ni Qixin Sun Yuan Zong Frontiers Science Center for Molecular Design Breeding Key Laboratory of Crop Heterosis and UtilizationBeijing Key Laboratory of Crop Genetic ImprovementChina Agricultural UniversityBeijing 100193China

Common wheat(Triticum aestivum)is one of the most widely cultivated and consumed crops *** the face of limited arable land and climate changes,it is a great challenge to maintain current and increase future wheat *** agronomic traits in wheat by introducing mutations across all three homoeologous copies of each gene has proven to be a difficult task due to its large genome with high ***,clustered regularly interspaced short palindromic repeat(CRISPR)/CRISPR-associ-ated nuclease(Cas)genome editing technologies offer a powerful means of precisely manipulating the genomes of crop species,thereby opening up new possibilities for biotechnology and *** this review,we first focus on the development and optimization of the current CRISPR-based genome editing tools in wheat,emphasizing recent breakthroughs in precise and multiplex genome *** then describe the general procedure of wheat genome editing and highlight different methods to deliver the genome editing reagents into wheat ***,we summarize the recent applications and ad-vancements of CRISPR/Cas technologies for wheat ***,we discuss the remaining chal-lenges specific to wheat genome editing and its future prospects.

关键词： Common wheat CRISPR/Cas Precise genome editing Delivery Wheat improvement

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Fluid/melt inclusions in Cenozoic mantle xenoliths from Linqu, Shandong Province, eastern China: Implications for asthenosphere-lithosphere interactions

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Chinese Science Bulletin 2010年第11期55卷 1067-1076页

作者： LIU JiQiang CHEN LiHui ni pei State Key Laboratory for Mineral Deposit Research Institute of Geo-Fluid Research School of Earth Sciences and Engineering Nanjing Univer-sity Nanjing 210093 China

Fluid and melt inclusions in mantle xenoliths are thought as direct samples to study mantle liquids. Here we apply Raman mi- crospectroscopy and microthermometry to fluid/melt inclusions in lherzolite xenoliths in Qiaoshan basalts, a Miocene volcano in Linqu, Shandong Province, eastern China. These inclusions include (1) early CO2 fluid inclusions, (2) early carbonate melt inclu-sions, (3) late CO2 fluid inclusions, and (4) late silicate melt inclusions. Among the early CO2 fluid inclusions, most consist of high-density pure CO2, while others have small amounts of other components besides of CO2, including graphite, magnesite, Mg-calcite, CO and N2. The lowest trapping pressures are estimated to be 1.42 GPa and 0.80 GPa for the early and the late fluid inclusions, respectively. Because orthopyroxene is the main host mineral for the early carbonate melt inclusions, we propose that the formation of these carbonate melts is genetically associated with the interactions between CO2 fluids and silicate minerals, e.g. olivine and clinopyroxene. The diversity of minor components in the early CO2 fluid inclusions indicates that mantle peridotites had undergone redox reactions with penetrating fluids/melts. These observations suggest that the compositions of the lithospheric mantle beneath the studied area had been changed by asthenosphere-derived CO2-rich fluids/melts.

关键词：流体包裹体熔融包裹体岩石圈地幔地幔包体相互作用中国东部软流圈山东省

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In situ cryogenic Raman spectroscopic studies on the synthetic fluid inclusions in the systems H_(2)O and NaCl-H_(2)O

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Chinese Science Bulletin 2006年第1期51卷 108-114页

作者： ni pei DING Junying RAO Bing State Key Laboratory for Mineral Deposit Research Institute of GeoFluid Research Department of Earth Science Nanjing University Nanjing 210093 China

Salt-hydrates have diagnostic cryogenic Raman spectra, which can reflect the composition of the parent solutions. As analogue to the natural fluid inclusions, the synthetic inclusions can be used to validate numerous assumptions related to fluid inclu- sion research. They can also be used to test the feasibility of application of laser Raman spectroscopy to individual fluid inclusion analysis. Using the tech- nique proposed by Sterner and Bodnar(1984), syn- thetic inclusions of the systems H2O and NaCl-H2O (with NaCl as 5.12 wt%, 9.06 wt%, 16.6 wt% and 25 wt%) were formed under the pressures from 50Mpa to 100Mpa and at the temperatures from 500℃ to 600℃. In situ cryogenic Raman spectra were col- lected at about –180℃ by combined use of freezing- heating stage and Laser Raman Microscopy. It is shown that hydrohalite (NaCl?2H2O), the salt-hydrate of NaCl in the fluid inclusions has the specific Raman spectrum and can be used as the standard to verify the existence of NaCl in the aqueous inclusions. The crystalline ice other than amorphous ice (glasses) formed from the aqueous phase whthin the synthetic inclusions during the initial freezing, but hydrohalite did not form. Subsequent warming of these inclusions induced a phase change, typically between ap- proximately –40 and –22℃, that represents the hy- drohalite crystallization event but not a eutectic melting event. So, for fluid inclusions in the system NaCl-H2O, interpretation of phase behavior below the eutectic temperature (–20.8℃) should be made with caution. The ratios of the relative intensity and the area of Raman spectra between 3423 cm–1 peak of hydrohalite and 3098 cm–1 peak of ice show positivecorrelations to the salinities in aqueous inclusions, which can be used to determine the salinity of NaCl- H2O system inclusions.

关键词：拉曼光谱测定 NaCl-H2O 流动分析

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Constraints on the Genesis of the Qixiashan Pb-Zn Deposit, Nanjing: Evidence from Sulfide Trace Element Geochemistry

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Journal of Earth Science 2020年第2期31卷 287-297页

作者： Xuejuan Sun pei ni Yulong Yang Zhe Chi Shan Jing State Key Laboratory for Mineral Deposit Research Institute of Geo-FluidsSchool of Earth Science and EngineeringNanjing UniversityNanjing 210023China East China Mineral Exploration and Development Bureau of Nonferrous Metal Jiangsu ProvinceNanjing 210007 China School of Geosciences Chengdu University of TechnologyChengdu 610059China

The large-scale Qixiashan Pb-Zn Deposit in the eastern Middle-Lower Yangtze metallogenic belt is hosted in carbonate *** on a detailed mineral paragenesis study,in-situ LA-ICP-MS(laser ablation inductively coupled plasma mass spectrometer)trace element geochemistry data for pyrite and sphalerite from different stages in the Qixiashan Deposit are reported,the Pb-Zn mineralization processes are reconstructed,and a genetic model is *** paragenetic stages of Pb-Zn ore deposition are identified:the biogenic pyrite mineralization stage(Stage 1),the early stage of hydrothermal Pb-Zn mineralization(Stage 2),the late stage of hydrothermal Pb-Zn mineralization(Stage 3),and the carbonate stage(Stage 4).Stages 2 and 3 are the main ore *** trace element characteristics of the sulfide in stages 2 and 3,such as the higher Co/ni and lower trace element contents of the pyrite and the Fe,Mn,and Ge contents of the sphalerite,indicate that they were generated by magmatic-hydrothermal ***,the lower Cu,Ag,Sb,and Pb contents of the pyrite and sphalerite of Stage 3 compared to Stage 2 suggest an increase in magmatic-hydrothermal activity from Stage 2 to Stage *** hydrothermal fluids leached trace elements(e.g.,Cu,Ag,Sb,and Pb)from the previously deposited primary pyrite and sphalerite,which were precipitated in the later hydrothermal stage Cu,Au,Ag,Sb,and Pb bearing minerals and secondary pyrite and sphalerite with lower trace element contents(e.g.,Cu,Au,Ag,Sb,and Pb).Compared with the pyrite from stages 2 and 3,the Stage 1 pyrite has relatively higher trace elements contents(Sb,Cu,Zn,Au,Ag,Pb,As,and ni).However,their lower Co/ni ratio suggests a syngenetic sedimentary *** on the petrographic features and trace element data,a multi-stage mineralization model is *** Stage 1 biogenic pyrite formed stratiform pyrite layers,which provided reducing conditions and a base for the subsequent Pb-Zn *** Stage 2,subse

关键词： sulfides trace elements superimposed mineralization Qixiashan Pb-Zn Deposit

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Raman Micro-Spectroscopic Study of Sulfate Ion in the System Na_2SO_4-H_2O

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Acta Geologica Sinica(English Edition) 2015年第3期89卷 887-893页

作者： ZHU Dongliang ZHU Ziang PAN Junyi DING Junying ni pei State Key Laboratory for Mineral Deposits Research School of Earth Science and EngineeringNanjing University

This work aims to quantify sulfate ion concentrations in the system Na_2SO_4-H_2O using Raman *** spectra of sodium sulfate solutions with known concentrations were collected at ambient temperature（293 K） and in the 500 cm^（_1）-4000 cm^（-1） spectral *** results indicate that the intensity of the SO_4^（2-） band increases with increasing concentrations of sulfate ion.A linear correlation was found between the concentration of SO_4^（2-）（c） and parameter I_1,which represents the ratio of the area of the SO_4^（2-） band to that of the O-H stretching band of water（A_s/A_w）：I_1=-0.00102＋0.01538 ***,we deconvoluted the O-H stretching band of water（2800 cm^（-1）-3800 cm^（-1）） at 3232 and 3430 cm^（-1） into two sub-Gaussian bands,and then defined Raman intensity of the two sub-bands as A_（Bi）（3232 cm^（-1）） and A_（B2）（3430 cm^（-1））,defined the full width of half maximum（FWHM） of the two sub-bands as W_（B1）（3232 cm^（-1）） and W_（B2）（3430 cm^（-1））.A linear correlation between the concentration of SO_4^（2-）（c） and parameter I_2,which represents the ratio of Raman intensity of SO_4^（2-）（A_s）（in 981 cm^（-1）） to（A_（B1）＋A_（B2））,was also established：I_2=-0.0111＋0.3653 ***,no correlations were found between concentration of SO_4^（2-）（c） and FWHM ratios,which includes the ratio of FWHM of SO_4^（2-）（W_s） to W_（B1） W_（B2） and W_（B1＋B2）（the sum of W_（B1） and W_（B2））,suggesting that FWHM is not suitable for quantitative studies of sulfate solutions with Raman spectroscopy.A comparison of Raman spectroscopic studies of mixed Na_2SO_4 and NaCI solutions with a constant SO_4^（2-） concentration and variable CI^- concentrations suggest that the I／ parameter is affected by CI^-,whereas the I_2 parameter was ***,even if the solution is not purely Na_2SO_4-H_2O,SO_4^（2-） concentrations can still be calculated from the Raman spectra if the H_2O band is deconvoluted into two sub-bands,making this method potentially applicable to analysis of natural fl

关键词： Na2SO4 -H2O system Raman spectroscopy quantitative analysis fluid inclusion

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Hydrothermal ore deposits in collisional orogens

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Science Bulletin 2019年第3期64卷 205-212页

作者： Yongfei Zheng Jingwen Mao Yanjing Chen Weidong Sun pei ni Xiaoyong Yang Key Laboratory of Crust-Mantle Materials and Environments Chinese Academy of Sciences School of Earth and Space Sciences University of Science and Technology of China Key Laboratory of Metallogeny and Mineral Assessment Ministry of Natural Rescources Institute of Mineral Resources Chinese Academy of Geological Sciences Key Laboratory of Orogen and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Key Laboratory of Marine Geology and Environment Center of Deep-Sea Research Institute of Oceanology Chinese Academy of Sciences State Key Laboratory for Mineral Deposits Research Institute of Geo-Fluids School of Earth Sciences and Engineering Nanjing University

Hydrothermal ore deposits at convergent plate boundaries represent extraordinary metal enrichment in the continental crust. They are generally associated with felsic magmatism in extensional settings at high thermal gradients. Although their formation is common during accretionary orogeny, more and more ore deposits have been discovered recently in the collisional orogens of China. Because collisional orogeny was operated in a compressional regime at low thermal gradients, it is not favorable for mobilization of ore-forming elements and thus for the production of hydrothermal ore deposits. Nevertheless, continental collision is generally preceded by oceanic subduction, which enables the preliminary enrichment of ore-forming elements in the mantle wedge due to chemical metasomatism by subducting slab-derived fluids. This gave rise to metal pre-enriched domains in the overriding lithosphere, which may be reactivated by extensional tectonism for hydrothermal mineralization either immediately during accretionary orogeny or at a later time during and after collisional orogeny. It is these tectonic processes that have resulted in the progressive enrichment of ore-forming elements through the geochemical differentiation of the subducting oceanic crust, the metasomatic mantle domains and the mafic juvenile crust, respectively, at different depths. Finally, the reactivation of metal pre-enriched domains by continental rifting in the orogenic lithosphere is the key to the metallogenesis of collisional orogens.

关键词： Ore deposits Hydrothermal fluid Accretionary orogen Collisional orogen Rifting orogen Tectonic reactivation

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Origin of ore-forming fluids of the Dachang Sn-polymetallic ore deposit: Evidence from helium isotopes

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Chinese Science Bulletin 2002年第12期47卷 1041-1045页

作者： Kuidong Zhao Shaoyong Jiang Hongquan Xiao pei ni Nanjing Univ Dept Earth Sci State Key Lab Mineral Deposits Res Nanjing 210093 Peoples R China

The ore genesis model for the Dachang Sn-polymetallic ore deposit has long been in dispute, and the major debate focuses on whether the stratiform and massive orebodies formed during the Yanshanian magmatic-hydro-thermal event or they were products of Devonian syn-sedi-mentary exhalative-hydrothermal event. This note presents new helium isotope data from fluid inclusions of four pyrites and one fluorite. The pyrites were collected from the stratiform and massive orebodies in the deposit, and their 3He/4He ratios are significantly higher than 1, ranging from 1.7 to 2.5 Ra, which indicates a mantle component in the responsible hydrothermal fluids. It is suggested that the ore-forming fluids were a mixture of deep circulating seawater and a mantle-derived fluid, which are similar to many of those modern submarine hydrothermal fluids. In contrast, the fluorite, collected from a granite-related hydrothermal vein in the deposit, shows a low 3He/4He ratio of 0.7 Ra, which indicates no mantle component

关键词： He and Ar isotopes crustal fluid mantle fluid massive sulfide deposit Dachang Sn-polymetallic deposit.

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Fluid Inclusion Studies of Ore and Gangue Minerals from the Piaotang Tungsten Deposit, Southern Jiangxi Province, China

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Acta Geologica Sinica(English Edition) 2022年第5期96卷 1647-1658页

作者： WANG Xudong ni pei YUAN Shunda LIU Jiqiang LI Mingyong LIU Hongxin Yuanpei College of Shaoxing University ShaoxingZhejiang 312000China State Key Laboratory for Mineral Deposit Research Institute of Geo-FluidsSchool of Earth Science and EngineeringNanjing UniversityNanjing 210093China MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

The Piaotang deposit is one of the largest vein-type W-polymetallic deposits in southern Jiangxi Province,South *** coexistence of wolframite and cassiterite is an important feature of the *** on detailed petrographic observations,microthermometry of fluid inclusions in wolframite,cassiterite and intergrown quartz was *** inclusions in wolframite were observed by infrared microscope,while those in cassiterite and quartz were observed in visible *** fluid inclusions in wolframite can be divided into two types:aqueous inclusions with a large vapor-phase proportion and aqueous inclusions with a small vapor-phase *** homogenization temperature(Th)of inclusions in wolframite with large vapor-phase ratios ranged from 280℃ to 390℃,with salinity ranging from 3.1 to 7.2 wt%NaCl *** contrast,the Th values of inclusions with small vapor-phase ratios ranged from 216℃ to 264℃,with salinity values ranging from 3.5 to 9.3 wt%NaCl eq.T_(h) values of primary inclusions in cassiterite ranged from 316℃ to 380℃,with salinity ranging from 5.4 to 9.3 wt%NaCl eq.T_(h) values for primary fluid inclusions in quartz ranged from 162℃ to 309℃,with salinity values ranging from 1.2 to 6.7 wt%NaCl *** results show that the formation conditions of wolframite,cassiterite and intergrown quartz are not *** evolutionary processes of fluids related to these three kinds of minerals are also significantly *** quartz cannot provide the depositional conditions of wolframite and *** fluids related to tungsten mineralization for the NaCl-H_(2)O system had a medium-to-high temperature and low salinity,while the fluids related to tin mineralization for the NaCl-H_(2)O system had a high temperature and medium-to-low *** results of this study suggest that fluid cooling is the main mechanism for the precipitation of tungsten and tin.

关键词： fluid inclusion ore mineral gangue mineral infrared microscopic study quartz-vein-type-tungsten deposit Piaotang

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Zircon U-Pb ages of granites at Changba and Huangzhuguan in western Qinling and implications for source nature

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Chinese Science Bulletin 2011年第7期56卷 659-669页

作者： WANG TianGang ni pei SUN WeiDong ZHAO KuiDong WANG XuDong School of Earth Sciences and Engineering State Key Laboratory for Mineral Deposits ResearchNanjing UniversityNanjing 210093China Institute of Geo-Fluids Nanjing UniversityNanjing 210093China Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 5100640China

Mesozoic granitoids are widespread in the Qinling-Dabie-Sulu orogenic belt. Precise U-Pb dating on these granitoids can reveal the evolution of the continental collision orogen and thus provide information on the nature of magma sources. This study pre-sents zircon LA-ICP-MS U-Pb dating and whole-rock geochemical analyses for two intrusions at Changba and Huangzhuguan in western Qinling. Zircon U-Pb ages for central and marginal phases of the Huangzhuguang intrusion are 214±1 Ma and 213±3 Ma, respectively. Zircons from the Changba intrusion yield a dominant cluster with an U-Pb age of 213±2 Ma. Collectively, these ages are younger than ages of 220 to 240 Ma for ultrahigh-pressure metamorphism due to the continental collision between the South China Block and the North China Block, corresponding to syn-exhumation magmatism. Some inherited zircons occur in the Changba intrusion, yielding a weighted mean of 206Pb/238U ages at 757±14 Ma. This indicates that the Changba intrusion has the crustal source of mid-Neoproterozoic ages and a tectonic affinity to the South China Block. Geochemically, the two intrusuons are both rich in LILE and LREE but depleted in HFSE and HREE, similar to arc-type igneous rocks. The Huangzhuguang intrusion exhibits linear correlations between SiO2 and the other major oxides, implying chemical evolution from a cognate magma source. It contains mafic enclaves, suggesting possible mixing of felsic-mafic magmas. The Changba granite is rich in Si and K but poor in Fe and Mg as well as has a high value of Fe, suggesting strong differentiation of granitic magma. Therefore, the two intrusions were derived from the Late Triassic anatexis of the continental crust of different compositions in the northern margin of South China Block. This process may be coupled with exhumation of the subducted continental crust in the stage of late collision.

关键词：平均年龄继承锆石花岗岩西秦岭 Pb 厂坝性质大陆碰撞造山带

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