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The geochemical multi-fractal characteristics and mineralization of the Dehelongwa copper-gold deposit

Chinese Journal Of Geochemistry 2014年第3期33卷 280-288页

作者： MAO Zhengli lai jianqing YANG Bo School of Surveying Engineering Henan University of Urban Construction Key Laboratory of Metallogenic Prediction of Nonferrous Metals Ministry of Education Central South University School of Geosciences and Info-Physics Central South University College of Resources and Environment Science Hunan Normal University

The spatial distribution of ore-forming elements is the result of interaction and influence among multiple factors in the process of mineralization, and is the specific embodiment of non-linearity and coupling of mineralization. The fractal theory has such functions as to characterize non-lineariry and coupling, and can find out the deterministic law from the complicated coupling process. The primary geochemical fractal distribution of metallogenic elements such as Cu and Au possesses the characteristics of multi-fractal distribution in the Dehelongwa copper-gold deposit. Copper follows 2-d fractal distribution, and Au follows 3- or 4-d fractal distribution. The primary geochemical fractal distribution has a certain similarity on the same prospecting line, and this similarity is not obvious among different prospecting lines. The secondary geochemical fractal distribution of Cu and Au is higher in similarity, and simpler than the primary geochemical fractal distribution. These results show that the mineralization of Cu and Au is out of sync and also is inconsistent in this deposit, and the mineralization of Cu mainly experienced two mineralization stages, while the mineralization of Au experienced three to four mineralization stages. Besides the mineralization of Cu and Au shows a certain direction and along the strike of vertical orebodies it is relatively balanced. While along the strike of the ore bodies the mineralization of Cu and Au shows a significant difference. The hypergenic geologic process has a certain effect on the balance of spatial distribution of Cu and Au. From these it can be seen that the mineralization process of this deposit is well characterized by the geochemical fractal distribution of Cu and Au.

关键词：铜金矿床多重分形地球化学矿床成矿特征和矿化过程耦合过程分形分布

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Fluid Inclusions and Metallization of the Kendekeke Polymetallic Deposit in Qinghai Province, China

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Acta Geologica Sinica(English Edition) 2014年第2期88卷 570-583页

作者： HUANG Min lai jianqing MO Qingyun Key Laboratory of Metallogenic Prediction of Nonferrous Metals Ministry of EducationCentral South University School of Geosciences and Info-Physics Central South University

The Kendekeke polymetallic deposit,located in the middle part of the magmatic arc belt of Qimantag on the southwestern margin of the Qaidam Basin,is a polygenetic compound deposit in the Qimantag metallogenic belt of Qinghai ***-periodic ore-forming processes occurred in this deposit,including early-stage iron mineralization and lead-zinc-gold-polymetallic mineralization which was controlled by later hydrothermal *** characteristics of the ore-forming fluids and mineralization were discussed by using the fluid inclusion petrography,Laser Raman Spectrum and micro-thermometry *** stages,namely,S1-stage （copper-iron-sulfide stage）,S2-stage （lead-zinc-sulfide stage） and C-stage （carbonate stage） were included in the hydrothermal process as indicated by the results of this *** fluid inclusions are in three types：aqueous inclusion （type I）,CO2-aqueous inclusion （type Ⅱ） and pure CO2 inclusion （type Ⅲ）.Type Ⅰ inclusions were observed in the S1-stage,having homogenization temperature at 240-320℃,and salinities ranging from 19.8％ to 25.0％（wt％ NaCl equiv.）.All three types of inclusions,existing as immiscible inclusion assemblages,were presented in the S2-stage,with the lowest homogenization temperature ranging from 175 ℃ to 295℃,which represents the metallogenic temperature of the *** salinities of these inclusions are in the range of 1.5％ to 16％.The fluid inclusions in the C-stage belong to types Ⅰ,Ⅱ and Ⅲ,having homogenization temperatures at 120-210℃,and salinities ranging from 0.9％ to 14.5％.These observations indicate that the ore-forming fluids evolved from high-temperature to low-temperature,from high-salinity to low-salinity,from homogenization to immiscible *** of Laser Raman Spectroscopy show that high density of CO2 and CH4 were found as gas compositions in the ***2,worked as the pH buffer of ore-forming fluids,together with reduction of organic gases （***4,etc）,affected the transport and sedim

关键词： fluid inclusions laser Raman spectroscopy Kendekeke Qinghai Province

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Geochemical anomaly structure of South Mining District of Fenghuangshan Copper Mine

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Chinese Journal Of Geochemistry 2012年第4期31卷 408-413页

作者： MAO Zhengli lai jianqing PENG Shenglin Department of Surveying&Urban Spatial Information Henan University of Urban ConstructionPingdingshan 467034China School of Geoscience and Environmental Engineering Central South UniversityChangsha 410083China

To study the geochemical anomaly structure of multi-element associations in the South Mining District of the Fenghuangshan Copper Mine,samples were collected and analyzed for their trace element ***-element anomaly associations were divided according to the correlations between Cu and each of the other elements,and the distribution characteristics of multi-element anomaly associations were also *** them,the anomaly distribution of metallogenic element Cu indicates the environment of *** study provided the basis for research on the metallogenic prediction and geochemistry of the Fenghuangshan Copper Mine.

关键词：元素地球化学凤凰山铜矿异常结构采区微量元素含量元素异常标本采集成矿元素

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Ore-forming Fluid Characteristics of the Saishitang Cu-polymetallic Deposit in Qinghai Province,China

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Acta Geologica Sinica(English Edition) 2015年第2期89卷 485-504页

作者： lai jianqing JU Peijiao MAO Yin AN Jianghua WANG Xiongjun Key Laboratory of Metallogenic Prediction of Nonferrous Metals Ministry of EducationCentral South University School of Geosciences and Info-Physics Central South University

Saishitang Cu-polymetallic deposit is located in the southeast section of Late Paleozoic arcfoid in the southeastern margin of Qaidam platform. Accoring to the geological process of the deposit, four mineralization episodes were identified： melt/fluid coexisting period （O）, skarn period （A）, first sulfide period （B） and second sulfide period （C）, and 10 stages were finally subdivided. Three types of inclusions were classified in seven stages, namely crystal bearing inclusions （type I）, aqueous inclusions （type Ⅱ） and pure liquid inclusions （type Ⅲ）. Type I and Ⅱ inclusions were observed in stage O1, having homogenization temperature from 252 to 431℃, and salinities ranging from 24.3% to 48.0%. Type I inclusion was present in stage A1, having homogenization temperature from 506 to 548℃, and salinities ranging from 39.4% to 44.6%. In stage B1, type Ⅱ and Ⅲ inclusions were observed, with homogenization temperature concentrating between 300-400℃, and salinities from 0.4% to 4.3%. Type II inclusions were present in stage B2, with homogenization temperature varying from 403 to 550℃. In stage C1, type I and II inclusion commonly coexisted, and constituted a boiling inclusion group, having homogenization temperatures at 187-463℃, and salinities in a range of 29.4%-46.8% and 2.2%-11.0%. Type II and III inclusions were developed in stage C2, having homogenization temperature at 124-350℃, and salinities ranging between 1.6% and 15.4%. In stage C3, type Ⅱ and Ⅲ inclusions were presented, with a homogenization temperature range of 164-360℃, and salinities varying from 4.0% to 11.0%. The results of micro-thermal analysis show that fluids are characterized by high temperature and high salinity in stage O1 and A1, and experienced slight decrease in temperature and dramatic decrease in salinity in stage B1 and B2. In stage C1, the salinity of fluid increased greatly and a further decrease of temperature and salinity occurred in stage C2 and C3. Fluids boiled in stage C1. With calcul

关键词： fluid inclusions ore-forming fluid Laser Raman Spectroscopy Saishitang Qinghai Province

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Chemical and boron isotopic compositions of tourmaline in the Longtoushan hydrothermal gold deposit, Guangxi, China:implications for gold mineralization

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Acta Geochimica 2019年第2期38卷 277-291页

作者： Lihua Qian jianqing lai Shugen Zhang Lifang Hu Rong Cao Shilong Tao Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education School of Geosciences and Info-Physics Central South University

The Longtoushan hydrothermal gold deposit is located in the southwestern region of the Dayaoshan *** is widespread in the Longtoushan gold deposit and is mainly distributed in the rhyolite porphyry and associated cryptoexplosive breccia. The spatial distribution of tourmaline enrichment is similar to that of the gold orebody. Feldspar has been largely replaced by tourmaline in the rhyolite porphyry and cryptoexplosive *** microprobe analysis revealed that tourmalines in the Longtoushan deposit belong mainly to the alkali group and partly to the X-vacant group; they mostly fell in the schorl-dravite series field. Two distinct sets of dominant substitutions were observed: MgFe_(-1) and Al□(NaR2+)-1,where R = Fe, Mg. In addition, minor substitutions include(CaMg)(NaAl)_(-1) and FeAl_(-1). The calculated d11 B value for the mineralizing fluids ranged from-12.8 to-9.7%,which is typical of S-type granites, and boron-enriched fluids predominantly derived from rhyolitic melt. Part of the tourmaline from the rhyolite porphyry crystallized during the magmatic-hydrothermal stage, whereas most tourmalines from the deposit formed in the post-magmatic hydrothermal stage. The tourmalines were deposited from a relatively reduced and acidic fluid system, and the gold predominantly precipitated during the post-magmatic hydrothermal stage in the Longtoushan deposit.

关键词： Longtoushan gold deposit Tourmaline Oreforming fluids Boron isotopes

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Geochronology and Geochemistry of the Granites from the Longtoushan Hydrothermal Gold Deposit in the Dayaoshan Area,Guangxi:Implication for Petrogenesis and Mineralization

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Journal of Earth Science 2019年第2期30卷 309-322页

作者： Lihua Qian jianqing lai Lifang Hu Rong Cao Shilong Tao Bei You Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationSchool of Geosciences and Info-physicsCentral South University

The gold mineralization in the Longtoushan hydrothermal gold deposit is concentrated within the contact zone of the granitic complex. Whole rock geochemistry and in-situ U-Pb and Hf isotopic data were used to constrain the genesis and age of the granites and related Cu-Au mineralization in the Longtoushan Deposit. The granites mainly consist of the granite porphyry, rhyolite porphyry, porphyritic granite and quartz porphyry. LA-ICP-MS U-Pb dating of zircons from the granite porphyry, rhyolite porphyry and quartz porphyry indicates that they intruded from ca. 94 to 97 Ma. These intrusions exhibit similar trace element characteristics, i.e., right-dipping REE patterns, depletion of Ba, Sr, P and Ti, and enrichment of Th, U, Nd, Zr and Hf. The εHf(t) values of zircons from the granite porphyry, rhyolite porphyry and quartz porphyry range from-26.81 to-8.19,-8.12 to-5.33, and-8.99 to-5.83, respectively, suggesting that they were mainly derived from the partial melting of the Proterozoic crust. The Cu-Au mineralization is mainly related to the rhyolite porphyry and porphyritic granite, respectively. The Longtoushan granites were most likely formed in a post-collisional extensional environment, and the deposit is a part of the Late Yanshanian magmatism related mineralization in the Dayaoshan area and its adjacent areas.

关键词： Longtoushan gold deposit rhyolite porphyry zircon U-Pb dating Hf isotopes petrogenesis Cu-Au mineralization

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Petrogenesis and Mineralization of Two-Stage A-Type Granites in Jiuyishan,South China:Constraints from Whole-rock Geochemistry, Mineral Composition and Zircon U-Pb-Hf Isotopes

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 874-900页

作者： LIU Ye lai jianqing XIAO Wenzhou Dick JEFFREY DU Rijun LI Shuanglian LIU Chaoyun WEN Chunhua YU Xiaohang Key Laboratory of Metaallogenic Prediction of Nonferrous Metals and Geological Enironment Monitoring Ministry of EducationCentral South UniversityChangsha 410083China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Hunan Institute of Geological Survey Changsha 410116China College of Marine Science and Technology China University of GeosciencesWuhan 430074China

The Jiuyishan complex massif,located in the northern section of the Nanling region,is a combination of five plutons,namely,the Xuehuading,Jinjiling,Pangxiemu,Shaziling and Xishan ***-rock geochemistry,Imineral electron microprobe analysis,zircon U-Pb dating and Hf isotope analysis were carried out for the Jinjiling and Pangxiemu *** zircon U-Pb dating yields weighted mean ages of 152.9±0.9 Ma for the Jinjiling pluton and 151.7±1.5 Ma for the Pangxiemu pluton,with a narrow gap between *** Jinjiling and Pangxiemu plutons both have geochemical characteristics of high SiO2,Al2 O3,Na2 O,K2 O and low TiO2,MgO,CaO,P2 O5 contents,with intense depletions in Sr,Ba,Ti,Eu and enrichments in Ga,FeoOT and HFSE,and these characteristics reflect an A-type *** the Jinjiling to the Pangxiemu plutons,the mineral composition of mica changes from lepidomelane to zinnwaldite,with increases in F,Li2 O and Rb2 O *** mineral composition of zircon changes from low Zr/Hf to high Zr/Hf,with increasing HfO2,P2 O5 and UO2+ThO2+Y2 O3 *** mineral compositions of feldspar indicate that the Pangxiemu pluton contains more alkali feldspar than the Jinjiling *** whole-rock geochemistry and mineral compositions reveal a higher degree of differentiation for the Pangxiemu *** nearly uniformεHf(t)indicates the same source region for the two plutons:both were derived from partial melting of the lower crust,with small contributions of mantle *** addition,higher F,lower Nb/Ta and Zr/Hf ratios in the Pangxiemu Pluton suggest a closer relationship with the rare metal mineralization than for the Jinjiling pluton.

关键词： zircon U-Pb dating mineral composition A-type granite rare metal mineralization Jinjiling pluton Pangxiemu pluton

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Characteristics of Fluid Inclusions and Metallogenesis of Annage Gold Deposit in Qinghai Province, China

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Open Journal of Geology 2015年第11期5卷 780-794页

作者： jianqing lai Peijiao Ju Jinjin Tao Baorong Yang Xiaoyun Wang Key Laboratory of Metallogenic Prediction of Nonferrous Metals Ministry of Education School of Geosciences and Info-Physics Central South University Changsha China No. 8 Team Qinghai Bureau of Nonferrous Metals Geological Exploration Xining China

The?Annage gold deposit is located at the east part of the eastern Kunlun orogenic belt. The characteristics of ore-forming fluids and metallogenesis were discussed by using fluid petrography, micro-thermometry and hydrogen-oxygen isotope analysis. Three stages, namely quartz-pyrite stage (A), quartz-polymetallic-sulfide stage (B) and quartz-ankerite stage (C) were included in the hydrothermal process as indicated by the results of this study. Inclusions developed in ore-bearing quartz veins from stages A and B are of three types: aqueous inclusions (type I), CO2-bearing inclusions (type II) and pure CO2?inclusions (type III). All three types of inclusions, mainly type I, are presented in stage A, having homogenization temperatures at 180°C - 360°C, and salinities ranging from 0.53% to 21.44%. In addition to development of type I inclusions, type II and III inclusions increase significantly in stage B, with homogenization temperatures ranging from 160°C to 330°C, and salinities are from 1.32% to 22.01%. Based on micro-thermometry, fluids in Annage deposit are of H2O-NaCl-CO2?type with medium-high temperature (140°C - 395°C) and medium-low salinity (0.53% - 22.01%). Results of hydrogen-oxygen isotope analysis show that ore-forming fluid is mainly CO2-rich magmatic fluid, mixed with shallow groundwater or metamorphic hydrothermal in the late mineralization stages. Calculated metallogenic pressures are in the range of 79 - 130MPa corresponding to a maximum depth of 4.8 km. The Annage deposit is a mesothermal quartz vein type gold deposit.

关键词： Fluid Inclusions Hydrogen-Oxygen Isotope Ore-Forming Fluid Metallogenesis Annage China

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流体包裹体在矿床研究中的作用

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矿床地质 2009年第6期28卷 850-855页

作者：池国祥赖健清加拿大里贾纳大学地质系中南大学地学与环境工程学院教育部"有色金属成矿预测"重点实验室湖南长沙410083

流体包裹体分析是现代矿床学研究的一个重要手段,对矿床类型的划分及成矿流体成分、温度、压力的研究有着重要的作用。在矿质沉淀的主要机制中,流体相分离及流体混合的主要证据来自流体包裹体;对金属在气相中的搬运的认识,也主要来自包... 详细信息

流体包裹体分析是现代矿床学研究的一个重要手段,对矿床类型的划分及成矿流体成分、温度、压力的研究有着重要的作用。在矿质沉淀的主要机制中,流体相分离及流体混合的主要证据来自流体包裹体;对金属在气相中的搬运的认识,也主要来自包裹体研究。成矿流体成分对认识金属在热液中的搬运方式起着重要作用,流体温度和压力数据是成矿流体动力学模式的重要制约。

关键词：地球化学流体包裹体热液矿床成矿热液矿质沉淀金属运移综述

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董事会特征影响公司绩效吗?

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金融研究 2004年第5期 64-77页

作者：李常青赖建清厦门大学管理学院厦门361005

本文系统回顾了国内外关于董事会特征与公司整体绩效之间关系的研究成果,并以上海证券交易所上市公司为研究样本,在实证基础上分析我国上市公司董事会特征与公司绩效之间关系。采用ROE、EPS和EVA衡量公司绩效,作者得出若干有意义结论:... 详细信息

本文系统回顾了国内外关于董事会特征与公司整体绩效之间关系的研究成果,并以上海证券交易所上市公司为研究样本,在实证基础上分析我国上市公司董事会特征与公司绩效之间关系。采用ROE、EPS和EVA衡量公司绩效,作者得出若干有意义结论:一、董事会规模与公司EPS和EVA负相关,但与ROE正相关;二、独立董事比例与公司绩效负相关;三、董事会会议频率不影响公司EVA;四、中国证监会于2001年8月发布的《关于在上市公司建立独立董事制度的指导意见》确实增强了独立董事的作用。五、CEO兼任董事长降低公司绩效,而CEO兼任董事不影响公司绩效。

关键词：公司治理董事会公司绩效独立董事

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