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Metallogeny of the Lannigou Sedimentary Rock-hosted Disseminated Gold Deposit in Southwestern Guizhou Province,China

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Acta Geologica Sinica(English Edition) 2007年第1期81卷 121-134页

作者： bao zhiwei Jayanta GUHA Key Laboratory for MetaUogenic Dynamics Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Guangdong 510640 China Earth Sciences/CERM University of Quebec at Chicoutimi Chicoutimi P.Q. G7H 2B1 Canada

The Lannigou deposit is a large-sized sedimentary rock-hosted disseminated gold （SRHDG） deposit located in the Youjiang Basin. It is hosted by the Middle Triassic turbidite. Wall rock alterations, including silicification, pyritization, arsenopyritization, carbonatization and argillization, commonly occur along fractures. PGE study demonstrates that either Permian basalts or Triassic ultrabasic intrnsives are unlikely to be the main source of gold mineralization. Coupled with the lack of other nmgmatic activity in the vicinity of the mining area, an amagmatic origin is proposed. Organic matter compositions and GC-MS analysis of the ores and host rocks show that the organics in the ores and the host rocks have a common source; the organic matter in the ores was mainly indigenous. The positive correlation between S2 and Au contents, along with the common occurrence of organic inclusions, suggest involvement of organic matter in the ore-forming process in terms of promoting Au leaching from the source rocks, making colloidal Au migration possible, as well as hydrocarbon reduction of sulphate. Geological and geochemical characteristics of the Lannigou deposit suggest that it was formed through circulation of meteoric water and probably less importantly organic bearing formation water driven by high geothermal gradient caused by late Yanshanian extension, which leached Au from the source bed, and then migrated as Au-bisnlfides and colloidal Au, culminating in deposition by reduction-adsorption and surface complexation of gold onto the growth surface of arsenlan pyrite.

关键词： sedimentary rock-hosted disseminated gold deposit metallogeny Lannigou Guizhou

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Geochemistry and geodynamic significance of the rare-earth mineralized Paleoproterozoic Longwangzhuang granite on the southern margin of the North China Craton

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Chinese Journal Of Geochemistry 2011年第2期30卷 270-279页

作者： bao, zhiwei Wang, Qiang Du, Fengjun Key Laboratory for Metallogenic Dynamics Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Isotope Geochronology Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Henan Institute of Geological Survey Zhenzhou 450007 China

The Longwangzhuang granite pluton occurs on the southern margin of the North China Craton and consists mainly of biotite syenogranite with aegirine granite being locally *** granites are characterized by high silicon and alkaline contents(SiO2=72.17%-76.82%,K2O+Na2O=8.28%-10.22%,K2O/Na2O>>1),AI(agpaitic index) =0.84-0.95,DI=95-97,ASI(aluminum saturation index)=0.96-1.13,and very high Fe* number(FeO*/(FeO*+Mg)=0.90-0.99),thus the granites are assigned to the metaluminous to weakly peraluminous,alkalic to calc-alkalic ferroan A-type *** granites are rich in large ion lithophile elements(LILE),especially high in REE concentrations(REE+Y=854×10-6-1572×10-6);whereas the enrichment of high strength field elements(Nb,Ta,Zr,Hf) is obviously less than that of LILEs,exhibiting mild depletions on trace element spider plots;and the rocks are significantly depleted in Ba,Sr,Ti,and *** low εNd(t) values(-4.5--7.2) and high model ages(2.3-2.5 Ga) of the granites as well as the low εHf(t) values(-1.11--5.26) and high Hf model ages(THf1= 2.1-2.3 Ga,THf2=2.4-2.6 Ga) of zircons from the biotite syenogranite suggest that the granites were probably derived from an enriched mantle *** zircons from the biotite syenogranite are mainly colorless transparent crystals exhibiting well-developed oscillatory zoning on the cathodoluminescence images with a LA-ICPMS zircon U-Pb age of 1602.1±6.6 Ma(MSWD=0.48).Petrochemical,trace elements,as well as Nd and Hf isotopic compositions of the rocks demonstrate that the granites were formed in a within-plate extensional tectonic regime possibly related to the breakup of the Columbia *** granites were most likely formed through extreme fractional crystallization of alkali basaltic magma resulted from partial melting of the mantle,which was fertilized by recycling crustal rocks triggered by the delamination of lithospheric mantle and lower crust following the ～1.8 Ga collision and amalgamation of the North Chin

关键词： syenogranite rare earth isotope geochemistry Proterozoic Columbia supercontinent

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A peculiar composite M-and W-type REE tetrad effect:Evidence from the Shuiquangou alkaline syenite complex,Hebei Province,China

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Chinese Science Bulletin 2010年第24期55卷 2684-2696页

作者： ZHAO ZhenHua bao zhiwei QIAO YuLou Key Laboratory for Metallogenic Dynamics Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

A new type of REE tetrad effect,a composite M-and W-type,was recognized in the K-feldsparthized and silicificated Shuiquangou alkaline syenites,Dongping,Hebei *** analytical methods such as ICP-MS and isotopic dilution thermal ion mass spectrometer were exploited to verify the REE concentrations of the samples in three laboratories in China,France and *** results are reliable and consistent within *** situ quantitative analysis of REE concentrations of individual zircons and apatites extracted from the very same sample has shown that fractional crystallization of magma and the superimposed hydrothermal alteration might have taken place in at least two-stage hydrothermal activities to generate the composite M-and W-type REE tetrad *** coexisting melt and aqueous phases,the superimposed alteration by volatile(Cl,CO2) -and Si,K, Al-enriched high temperature hydrothermal fluids might be the important facts for this new MW-type of REE tetrad *** addition,the peculiar MW-type tetrad effect might be an indicator for Au mineralization of reworked plutons.

关键词：四重效应碱性正长岩水泉沟河北省稀土 W型复合中国

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Impact of hydrothermal alteration on the U-Pb isotopic system of zircons from the Fangcheng syenites in the Qinling orogen,Henan Province,China

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Chinese Journal Of Geochemistry 2009年第2期28卷 163-171页

作者： bao zhiwei WANG Qiang BAI Guodian ZHAO Zhenhua Key Laboratory for MetaUogenic Dynamics Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Henan Institute of Geological Survey Zhenzhou 450007 China

Disturbance of the zircon U-Pb isotopic system has been investigated extensively, but mostly in lab, in the last decades. Here, we reported a field-based study on intensive sericitization, K-feldsparthization and the impacts of mylonitization on zircons from the Fangcheng *** Fangcheng syenites occur in the eastern part of the Qinling orogen and consist mainly of aegirine-augite syenite, aegirine nepheline syenite, biotite syenite and hornblende nepheline syenite. Zircons from the slightly sericitized aegirine augite syenite are colorless, transparent crystals and exhibit well-developed oscillatory and sector zoning on the cathodoluminescence (CL) images which are typical of magmatic zircons from alkaline rocks. Zircon U-Pb determinations by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) showed that the syenite was formed in Neoproterozoic time, the weighted average of 206Pb/238U ages is 844.3±1.6 Ma (MSWD=0.86). In contrast, the hydrothermally altered zircons (hydrothermal zircon) from the intensively sericitized, K-feldsparthized, and weakly mylonitized aegirine augite syenite are conglomerates, yellowish to brown in color, generally translucent and internally textureless. The CL and backscatter electron (BSE) images of hydrothermal zircons exhibit fractured, textureless or mosaic textures, and occasionally show "sponge texture" with the veinlets and inclusions of K-feldspar; however, relicts of magmatic oscillatory zoning can still be discerned locally in individual grains. LA-ICPMS analyses of the hydrothermal zircons demonstrated that the zircons are chemically inhomogeneous, with enhanced and widely varied Pb, U, and Th contents. The U and Th contents of the hydrothermal zircons are estimated to be 32×10-6-1550×10-6 and 188×10-6-4059×10-6, respectively, with Th/U ratios within the range of 0.7-44.9. 206Pb/238U apparent ages of the hydrothermal zircons are negatively correlated with the contents of U, and radiogenic and common P

关键词：霞石正长岩 Pb同位素热液锆石秦岭造山带同位素体系防城港电感耦合等离子体质谱热液蚀变

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Improved energy storage performance of nanocomposites with Bi_(4.2)K_(0.8)Fe_(2)O_(9+δ) nanobelts

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Journal of Materiomics 2020年第2期6卷 371-376页

作者： Chuangming Hou zhiwei bao Haoyang Sun Yuewei Yin Xiaoguang Li Hefei National Laboratory for Physical Sciences at the Microscale Department of Physicsand CAS Key Laboratory of Strongly-coupled Quantum Matter PhysicsUniversity of Science and Technology of ChinaHefei230026China School of Physics and Materials Science Anhui UniversityHefei230601China Collaborative Innovation Center of Advanced Microstructures Nanjing210093China

Modern electronics and electric power grids require high performance polymer-based dielectric *** realize large-scale applications,the energy density of nanocomposites needs to be further ***,we demonstrate a remarkable improvement in energy density of poly(vinylidene fluoride)(PVDF)matrix upon the incorporation of high-k Bi_(4.2)K_(0.8)Fe_(2)O_(9+δ)(BKFO)*** aspect ratio BKFO nanobelts can enhance the Young's moduli of the nanocomposites and increase the path tortuosity of electrical trees,which are favorable for increasing the breakdown strength of the ***,the dielectric constant and breakdown strength increase simultaneously at a low volume fraction(0.35 vol%)of BKFO nanobelts,and an ultrahigh recoverable energy density of 25.4 J/cm^(3) is *** results provide a strategy to develop high performance flexible high-energy-density devices.

关键词： Dielectric nanocomposite Energy storage Nanobelt Breakdown strength

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Petrogenesis of the Payangazu Complex in Southern Mandalay, Central Myanmar and Its Tectonic Implications

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Journal of Earth Science 2019年第1期30卷 20-36页

作者： Kaixuan Li Huaying Liang zhiwei bao Wenting Huang Jian Zhang Long Ren Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of Geochemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

The Payangazu complex in the central Myanmar is composed mainly of quartz diorite,granodiorite,and some synplutonic mafic *** quartz diorite and granodiorite have zircon U-Pb ages of 130.5±4.0(MSWD=3.5)and 118.4±2.5 Ma(MSWD=2.4),*** samples of the quartz diorite and granodiorite are metaluminous,enriched in large-ion lithophile elements like LREE,Rb,Th,and U,and depleted in high field-strength elements such as HREE,Nb,Ta,P,and Ti,indicative of arc-type magmatic *** rock samples of the quartz diorite haveε_(Hf)(t)value of+0.6,initial ^(87)Sr/^(86)Sr ratios of 0.708 6 to 0.710 0,andε_(Nd)(t)values of-4.8 to-4.9;whereas rocks of the granodiorite are relatively isotopically enriched,withε_(Hf)(t)values of-5.1 to-7.2,initial ^(87)Sr/^(86)Sr ratios of 0.711 7 to 0.711 8,andε_(Nd)(t)values of-8.7 *** isotopic data together with the high Mg~#(both the quartz diorite and granodiorite have Mg~#values of>40)suggest a strong involvement of mantle materials in the genesis of the parent *** possible petrogenetic process may be that the ascending of melts from partial melting of metasomatized mantle wedge triggered by dehydration of subducted slab resulted in partial melting of the lower crust and mixed with the *** Early Cretaceous intrusions from the complex are older than those found in the eastern Wuntho-Popa arc in western Myanmar,eastern Himalaya,and western Yunnan which are interpreted to be related to the Neo-Tethyan subduction,and haveε_(Nd)(t),ε_(Hf)(t)values lower than the *** the contrary,the ages and geochemical characteristics of the Payangazu complex are consistent with some of the intrusions in the northern magmatic belt in Tibet,eastern Himalaya,and western Yunnan which are believed to be associated with the subduction of the Bangong-Nujiang Ocean ***,we propose that the Early Cretaceous intrusions in the central Myanmar are most likely related to the southward subduction of an ocean slab that wa

关键词： central Myanmar zircon U-Pb age isotope Early Cretaceous subduction

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Research Progress of the Mineralization of Carbonate-Hosted Pb-Zn Deposits in the Sichuan-Yunnan-Guizhou Pb-Zn Metallogenic Province, Southwest China

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Acta Geologica Sinica(English Edition) 2015年第1期89卷 307-308页

作者： ZHOU Jiaxi HUANG Zhilong YE Lin bao zhiwei LIU Yun XIA Yong State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences CAS Key Laboratory for Mineralogy and Metallogeny Guangzhou Institute of Geochemistry Chinese Academy of Sciences

The Sichuan-Yunnan-Guizhou （SYG） Pb-Zn metallogenic province in the western Yangtze Block, is a key component of the low-temperature metallogenic domain in South China. In this area, more than 400 Pb-Zn deposits have been discovered, and the total proven reserves are up to 260 million tons with lead and zinc grade reaching 10%, even up to 30%.

关键词： Pb Southwest China Research Progress of the Mineralization of Carbonate-Hosted Pb-Zn Deposits in the Sichuan-Yunnan-Guizhou Pb-Zn Metallogenic Province Zn

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Geochronology and geochemistry of the Fangcheng Neoproterozoic alkali-syenites in East Qinling orogen and its geodynamic implications

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Chinese Science Bulletin 2008年第13期53卷 2050-2061页

作者： bao zhiwei WANG Qiang BAI GuoDian ZHAO ZhenHua SONG YaoWu LIU XiaoMing Key Laboratory for Metallogenic Dynamics Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Henan Institute of Geological Survey Zhengzhou 450007 China Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China

Finding of Neoproterozoic syenites at Fangcheng in the northern Qinling region of the East Qinling orogen provides an important constraint on timing of tectonic transformation to extensional regime. The alkaline pluton consists mainly of nepheline syenite,aegirine syenite,and alkali-feldspar syenite. The syenites are of intermediate (SiO2=54%―62%),rich in alkali (K2O+Na2O=12%―15%),aluminum (Al2O3=16.81%―23.26%) and large ion lithophile elements (LILE),without any obvious Nb,Ta,Zr,and Hf anoma-lies. The Fangcheng syenites are geochemically characterized by relative enrichment of LREE,minor differentiation of HREE,significant negative Eu anomalies (Eu=0.13―0.23),less negative εNd(t) values of -1.37 to -3.90,young Nd model ages of 1364 to 1569 Ma,and high zircon saturation temperatures of 915 to 1044℃. The syenitic magmas probably originated from small proportion melting of upper mantle in an extensional regime of intraplate-anorogenic tectonic setting,and have been slightly contaminated by crustal materials during ascending and/or emplacement. LA-ICP-MS zircon U-Pb dating yields ages of 844.3±1.6 Ma (MSWD=0.86),suggesting that the Fangcheng alkaline syenites formed in the early Neo-proterozoic. They are the oldest Neoproterozoic alkaline rocks ever recognized in the Qinling orogen as well as in South China. This implies that the tectonic regime of the Qinling region would have transformed from post-collisional stretch to intraplate-anorogenic extension no later than 844 Ma.

关键词：黑花岗石地球化学锆石测定年代

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Adakite-type sodium-rich rocks in Awulale Mountain of west Tianshan:Significance for the vertical growth of continental crust

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Chinese Science Bulletin 2001年第10期46卷 811-817页

作者： XIONG Xiaolin ZHAO Zhenhua BAI Zhenghua MEI Houjun WANG Yixian WANG Qiang XU Jifeng Niu Hecai bao zhiwei Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China State Key Laboratory of Mineral Deposit Research of Nanjing University Nanjing 210093China

The sodium-rich dacites and albite porphyries of Permian in the Awulale Mountain of west Tianshan have unique chemical and trace element signatures identical to adakite. These intermediate-acidic igneous rocks are characterized by high Na2O, Al2O3 and Sr contents and high Sr/Y and La/Y ratios (>40 and >20, respectively), and low Y and Yb contents, and strong depletion in HREE, and positive Eu anomaly. The (143Nd/144Nd)i is in the range from0.51236 to 0.51248 and the εNd(t) is positive value (+0.79-+3.11); the (87Sr/86Sr)i is in the range from 0.7052 to 0.7054. These Nd and Sr isotopic composition features indicate that the source rocks of these adakite-type rocks are from a weakly depleted mantle, or a depleted mantle, but was contaminated by the crustal materials. These adakite-type rocks were most likely derived from the partial melting of new underplated basaltic rocks under the conditions of amphibo-lite to eclogite transition in the postcollisional environment of North Xinjiang during the Permian

关键词： Awulale adakite-type rocks underplating vertical growth of continental crust.

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热液白云岩的研究现状及展望

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大地构造与成矿学 2018年第4期42卷 699-717页

作者：李群包志伟中国科学院广州地球化学研究所中国科学院矿物学与成矿学重点实验室广东广州510640 中国科学院大学北京100049

热液白云岩与油气藏及赋存在沉积岩中的铅锌矿床,特别是密西西比河谷型(MVT)铅锌矿床具有密切的空间联系。MVT矿床赋矿地层均存在大范围的白云岩化,地质找矿实践中热液白云岩常作为MVT矿床的重要找矿标志之一,然而热液白云岩与MVT矿床... 详细信息

热液白云岩与油气藏及赋存在沉积岩中的铅锌矿床,特别是密西西比河谷型(MVT)铅锌矿床具有密切的空间联系。MVT矿床赋矿地层均存在大范围的白云岩化,地质找矿实践中热液白云岩常作为MVT矿床的重要找矿标志之一,然而热液白云岩与MVT矿床之间的成因联系一直存在争议。本文对热液白云岩的定义、地球化学特征、空间展布规律、成因模式及其与热液矿床和油气储存关系的研究历史及现状进行了系统评述,并结合滇东北地区MVT矿床实例对热液白云岩与硫酸盐热还原过程、硫化物沉淀之间的关系及其找矿地质意义进行了探讨,并对热液白云岩研究存在的问题和研究方向进行了讨论和展望。

关键词：热液白云岩 MVT铅锌矿找矿标志成因模式硫酸盐热还原作用

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