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Fe-bearing minerals and implications for gold mineralization for the Wangu deposit in Central Jiangnan Orogen

Acta Geochimica 2023年第3期42卷 552-571页

作者： Teng Deng Longyue Zhou zenghua li State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China School of Earth Sciences East China University of TechnologyNanchang 330013China

Hydrothermal alteration with bleaching of host rocks is the most important prospecting indicator for gold deposits in the Jiangnan Orogen *** alteration has been identified as pre-ore carbonate(siderite)-sericitization and the Fe of siderite in the alteration zone is derived from the host rocks rather than *** addition,such alteration decreases in intensity and width with depth and gold mineralization also occur in the non-bleached rocks,casting doubt on the reliability of the prospecting *** petrographic work and SEM analysis on the Wangu deposit indicate that there are two types of siderites,i.e.,Sd1 and *** them,Sd1 grains are relatively small and distributed along the planes of unaltered host rocks,while Sd2 grains,only occurring in the altered slates,are commonly *** types of siderites were altered by auriferous fluids,producing porous cores and minerals such as pyrite,quartz,and *** with unaltered parts,the altered parts have lower Fe,but higher U,Pb,and *** addition,Sd1 and Sd2 are similar in Mn,Na,V,and Sr concentrations but different in Fe and *** occurrence and geochemical compositions of both siderites indicate that Sd1 could be transformed into Sd2 by pre-mineralization alteration through *** is another important Fe-bearing mineral in the host rocks,and EPMA analysis suggests that it is ripidolite with relatively high Fe ***,chlorite can also provide Fe to form the pre-ore carbonate(siderite)-*** modeling demonstrates that both ripidolite and siderite can result in sulfidation and therefore gold *** a result,this study demonstrates that pre-ore alteration with characterized bleaching is not a prerequisite for gold mineralization despite of its prominent *** to the presence of Fe-bearing Sd1 and chlorite,gold mineralization could still occur through sulfidation in the unaltered rocks.

关键词： Jiangnan Orogen Gold precipitation Wangu deposit Hydrothermal alteration Fe-bearing minerals

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Ore-forming mechanism of Huxu Au-dominated polymetallic deposit in the Dongxiang Basin,South China:Constraints from in-situ trace elements and S-Pb isotopes of pyrite

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Acta Geochimica 2024年第6期43卷 1223-1240页

作者： Hongze Gao Jiajie Chen Chengbiao Leng Yuhui Hu Huidan Xie zenghua li State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China National Key Laboratory of Prospecting Mining and Remote Sense Detecting on Uranium ResourcesNanchang 330013China School of Earth Sciences East China University of TechnologyNanchang 330013China

The Huxu Au-dominated polymetallic deposit is a hydrothermal deposit located in the Dongxiang volcanic basin in the middle section of the Gan-Hang tectonic belt in South *** orebodies primarily occur within the Jurassic-Cretaceous quartz diorite porphyry,while the genesis of this deposit is *** study focused on geological and mineralogical characteristics,in-situ trace elements and S-Pb isotopes of three generations of pyrite of the Huxu deposit to clarify the distribution of trace elements in pyrite,ore-forming fluid and material sources,and genetic types of the *** mineralization stage of the deposit can be divided into quartz-pyrite stage(S1),quartz-pyrite-hematite stage(S2),quartz-polymetallic sulfide stage(S3)and quartz-hematite stage(S4),with the corresponding pyrite being divided into three generations(Py1-Py3).in-situ trace element data of pyrite show that Au in pyrite mainly exists in the form of solid solution(Au^(+)),and the content is relatively low at all stages(0.18 ppm for Py1,0.32 ppm for Py2,0.68 ppm for Py3),while Pb and Zn mainly exist as sulfide inclusions in the pyrite.S-Pb isotopes show that the sulfur and ore-forming material of this deposit are mainly sourced from *** mineral association,mineral textures and trace elements in different stages of pyrite indicate that fluid boiling and fluid mixing are the key factors of native gold precipitation in S2 and S4,respectively,while water-rock interaction controlled the precipitation of Pb-Zn *** integrating with geological characteristics suggests that the deposit should be an intermediate sulfidation epithermal deposit.

关键词： Au-dominated Polymetallic deposit Intermediate sulfidation Epithermal deposit Pyrite Trace element S-Pb isotope Tectonic belt

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Role of Hematite-Rich Host Rocks in the Gold Mineralization of the Woxi Au(-Sb-W) Ore Deposit in Western Jiangnan Orogen of South China

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Journal of Earth Science 2023年第5期34卷 1527-1542页

作者： Jian Zhang Teng Deng Deru Xu Junfeng Dai zenghua li Bin li Yueqiang Zhou State Key Laboratory of Nuclear Resources and Environment School of Earth SciencesEast China University of TechnologyNanchang 330013China Team 402 Hunan Geology and Mineral Resources Exploration and Development BureauChangsha 410014China

The formation of many hydrothermal gold deposits is closely related to iron-rich rocks. The host rocks of the Madiyi Formation of the Mid-to Late Neoproterozoic Banxi Group for the Woxi Au(-Sb-W) deposit, which is located in western Hunan Province of the western Jiangnan Orogen, South China, is rich in hematite, which provides a good example for studying the relationship between the formation of gold deposit and iron-rich rocks. Field investigation and petrographic observation on the unaltered, weakly altered and strongly altered rocks demonstrate that the bleaching is caused by a combination of carbonatization, sulfidation and sericitization. Mass balance calculation suggests that, during decolourization there is no change in TFe_(2)O_(3), while FeO is gained and Fe_(2)O_(3)is lost. Geochemical modeling found that Au was mainly present as AuHS(aq) and Au(HS)-2, and that the water-rock interactions decreased the sulfur fugacity which destroyed the stability of such aqueous complexes. Combined with the locally occurred native gold in quartz veins, it is concluded that the major gold precipitation mechanisms are sulfidation and fluid boiling. Based on previous geochronological and geochemical research further gold mineralization is proposed to be generated by deep sourced magmatic or metamorphic fluid migrated upward along the Woxi fault, and the iron-rich Madiyi Formation is the idea chemical trap for gold deposition. The decrease of sulfur contents caused by fluid-rock interactions and fluid boiling are the major mechanisms for gold mineralization.

关键词： bleaching alteration mass balance calculation geochemical modeling Woxi Au(-Sb-W)deposit western Jiangnan Orogen South China mineral deposits petrology

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Hydrodynamic links between Shallow and Deep Mineralization Systems and Implications for Deep Mineral Exploration

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 1-25页

作者： CHI Guoxiang XU Deru XUE Chunji li zenghua Patrick LEDRU DENG Teng WANG Yumeng SONG Hao Department of Geology University of Regina3737 Wascana ParkwayReginaSK S4S 0A2Canada State Key Laboratory of Nuclear Resources and Environment School of Earth SciencesEast China University of TechnologyNanchang 330013China State Key Laboratory of Geological Processes and Mineral Resource School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China Universite Lorraine UMR 7359 GeoRessources54506 Vandœuvre les NancyFrance Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu University of TechnologyChengdu 610059China

Deep mineral exploration is increasingly important for finding new mineral resources but there are many *** the factors controlling the localization of mineralization at depth can reduce the risk in deep mineral *** of the relatively poorly constrained but important factors is the hydrodynamics of *** paper reviews the principles of hydrodynamics of mineralization,especially the nature of relationships between mineralization and structures,and their applications to various types of mineralization systems in the context of hydrodynamic linkage between shallow and deep parts of the *** categories of mineralization systems were examined,i.e.,magmatic-hydrothermal systems,structurally controlled hydrothermal systems with uncertain fluid sources,and hydrothermal systems associated with sedimentary *** implications for deep mineral exploration,including potentials for new mineral resources at depth,favorable locations for mineralization,as well as uncertainties,are discussed.

关键词： hydrodynamics structural control of mineralization mineral systems shallow and deep mineralization deep mineral exploration

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The shortest period of coal spontaneous combustion on the basis of oxidative heat release intensity

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International Journal of Mining Science and Technology 2014年第1期24卷 99-103页

作者： Yang Yongliang li zenghua Hou Shisong Gu Fanjun Gao Siyuan Tang Yibo School of Safety Engineering China University of Mining & Technology Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast University State Key Laboratory of Coal Resources and Safe Mining China University of Mining & Technology

It’s necessary to forecast the shortest spontaneous combustion period for preventing and controlling the coal spontaneous *** the experimental process,a calculating model of the SSCP is established on the basis of the oxidative heat release intensity and thermal capacity at different *** to the basic parameters of spontaneous combustion,heat of water evaporation and gas desorption,the SSCPs of different coals are further ***,this study analyzed the relationships of the SSCP and the judging indexes of the self-ignite *** result shows that the SSCP non-linearly increases with the decrease of dynamic oxygen adsorption and increase of activation *** with the practical fire situation of mine,this reliable method can meet the actual requirement of mine production.

关键词： Coal spontaneous combustion The shortest period of spontaneouscom bustion Heat release intensity of coal oxidation Thermal capacity Judging indexes

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The role of hematite-rich host rocks in the gold mineralization of the Woxi Au(-Sb-W) ore deposit in western Jiangnan Orogen of South China

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Journal of Earth Science 2022年

作者： Jian Zhang Teng Deng Deru Xu Junfeng Dai zenghua li Bin li Yueqiang Zhou State Key Laboratory of Nuclear Resources and Environment， School of Earth Sciences， East China University of Technology Team 402， Hunan Geology and Mineral Resources Exploration and Development Bureau

The formation of many hydrothermal gold deposits is closely related to iron-rich rocks. The host rocks of the Madiyi Formation of the Mid- to late Neoproterozoic Banxi Group for the Woxi Au （-Sb-W） deposit， which is located in western Hunan Province of the western Jiangnan Orogen， South China， is rich in hematite， which provides a good example for studying the relationship between the formation of gold deposit and iron-rich rocks. Field investigation and petrographic observation on the unaltered， weakly altered and strongly altered rocks demonstrate that the bleaching is caused by a combination of carbonatization， sulfidation and sericitization. Mass balance calculation suggests that， during decolourization there is no change in TFe2O3， while FeO is gained and Fe2O3is lost. Geochemical modeling found that Au was mainly present as AuHS（aq） and Au（HS）2-， and that the water-rock interactions decreased the sulfur fugacity which destroyed the stability of such aqueous complexes. Combined with the locally occurred native gold in quartz veins， it is concluded that the major gold precipitation mechanisms are sulfidation and fluid boiling. Based on previous geochronological and geochemical research further gold mineralization is proposed to be generated by the later Caledonian ore-forming fluid migrated upward along the Woxi fault， and the iron-rich Madiyi Formation is the idea chemical trap for gold deposition. The decrease of sulfur contents caused by fluid-rock interactions and fluid boiling are the major mechanisms for gold mineralization.

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Theoretical Nuclear Physics--Kaon Condensed Phase in Neutron Star Matter and Three-nucleon Force Effect

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近代物理研究所和兰州重离子加速器实验室年报：英文版 2004年第1期 1-1,3页

作者： li Ang li zenghua School of Physics and Technology Lanzhou University Lanzhou 730000 P. It. China. 2Dipartimento di Fisica Universita di Catania and INFN-LNS Catania Italy.

Within the framework of the Brueckner-Hartree-Fock approach, the effect of a microscopic nuclear three-body force (TBF) on the composition of the kaon condensed phase in chemical equilibrium neutron star matter has been studied. In Fig.1 is plotted the composition of neutron star matter for three different values of a3ms. The kaon condensed phase of neutron star matter turns out to be proton-rich instead of neutron-rich. The three-body force has an important influence on the composition of the kaon condensed phase. Inclusion of the three-body force contribution in the nuclear symmetry energy results in a significant reduction of the proton and kaon fractions in the kaon condensed phase which is more proton-rich in the case of no three-body force. The equation of state of neuron star matter is found to be softened considerably by the kaon-nucleon interaction in the kaon condensed phase.

关键词：中子星物质核子相互作用 K介子凝聚相理论核物理化学平衡物质构成 rich

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A Lower Ordovician Carbonate Contourite Drift on the Margin of the South China Paleocontinent at Jiuxi,Northern Hunan

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Acta Geologica Sinica(English Edition) 1990年第4期64卷 393-407,465-466页

作者： Duan Taizhong Guo Jianhua Gao Zhenzhong li zenghua Zeng Yunfu Jianghan Petroleum Institute, Shashi, Hubei Chengdu College of Geology, Sichuan liu linqun Jianghan Petroleum Institute Shasli Hubei China

Carbonate contourite drift at Jiuxi. Taoyuan, northern Hunan, was developed in a deepwater area ofnorthern Hunan on the margin of the Early Ordovician South China palcocontinent. The Lower Ordoviciansequence in the area is more than 350 m thick and contains well-developed contourites that can be groupedinto the following five types: the calcilutitic, the arenitic, the siltitic. the fine ruditic and the bioclastic. Thefirst three often constitute a complete or incomplete contourite succession. The arenitic contourite is nearlyuniformly distributed as interlayers throughout the succession, creating a monotonously rhythmic texture inthe contourite drift. The pattern of spatial distribution of the succession shows that the contourite drift is ahuge ridge-like sedimentary body extending along the trend of paleoslope. Numerous marks of flow direc-tion have pointed to an eastward paleoflow direction along the slope.

关键词： A Lower Ordovician Carbonate Contourite Drift on the Margin of the South China Paleocontinent at Jiuxi Northern Hunan

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Mass Transfer during Hematitization and Implications for Uranium Mineralization in the Zoujiashan Deposit,Xiangshan Volcanic Basin

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Journal of Earth Science 2022年第2期33卷 422-434页

作者： Teng Deng Guoxiang Chi Xiongjie Zhang zenghua li Deru Xu Shengmiao li Pengfei Du Pei Shang Shaohao Zou Wanpeng Zhou Ke Xu Hai Yan MaWen Zhengpeng Ding State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China Key Laboratory of Uranium Geology China Geological SurveyTianjin 300170China School of Earth Sciences East China University of TechnologyNanchang 330013China Department of Geology University of ReginaRegina S4S 0A2Canada Engineering Research Center of Nuclear Technology Application Ministry of EducationEast China University of TechnologyNanchang 330013China Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology East China University of TechnologyNanchang330013China Geological Bureau of Hunan Province Changsha 410014China Geologic Party No.208 China National Nuclear CorporationBaotou 410014China

The Zoujiashan uranium deposit in the Xiangshan ore field is the largest volcanic-related uranium deposit in ***-and fluorite-type ores are the predominant mineralization *** in the Xiangshan ore field is closely associated with uranium mineralization,mainly occurring as hematitized rocks enclosing fluorite-type vein ores developed in pre-ore illitized porphyritic *** petrographic and mass balance calculation studies were conducted to evaluate the mechanisms for uranium precipitation and mass transfer during *** observations suggest that in the hematitized rocks,orthoclase is more altered than plagioclase,and quartz dissolution is common,whereas in the illitized rocks,pyrite commonly occurs within the altered biotite grains,and chlorite grains are locally *** balance calculations indicate that Na2O and U were gained,K2O,Ca O and Si O2were lost,whereas Fe2O3-t remained more or less constant during *** observations suggest that the hydrothermal fluids were Na-and U-rich and Ca-K-poor,and the Fe2+used for hematitization was locally derived,most likely from biotite,pyrite and chlorite in the host *** Fe2+is inferred to have played the role of reductant to precipitate uranium,and calculation indicates that oxidation of Fe2+provided by host rocks is sufficient to form ores of economic ***,the hematite-type ore is interpreted to be generated by the reaction between oxidized ore fluids and reduced components in host *** development of calcite and pyrite in the fluorite ores suggests that perhaps mixing between the U-rich fluid and another fluid carrying reduced sulfur and carbon may have also contributed to uranium mineralization,in addition to temperature and pressure drop associated with the veining.

关键词： Xiangshan uranium ore field mass transfer uranium precipitation hematitization redox reaction ore deposit geology

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煤自燃大分子量气态产物生成规律研究

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中国矿业大学学报 2023年第6期52卷 1119-1128页

作者：李增华苗国栋中国矿业大学安全工程学院江苏徐州221116

除了常见的煤自燃预报标志气体外,煤在低温氧化过程中会生成许多分子量相对较大的气态产物,这些尚未被人们关注的大分子量气态产物同样携带着能够反映煤自燃进程的关键信息.为了探究煤自燃过程中大分子量气态产物的生成规律,使用气相色... 详细信息

除了常见的煤自燃预报标志气体外,煤在低温氧化过程中会生成许多分子量相对较大的气态产物,这些尚未被人们关注的大分子量气态产物同样携带着能够反映煤自燃进程的关键信息.为了探究煤自燃过程中大分子量气态产物的生成规律,使用气相色谱分析技术对煤低温氧化和热解过程中生成的气态产物进行检测.结果表明:在煤的低温氧化和热解过程中共检测到19种大分子量气态产物,包括16种C_(4)~C_(7)烃类化合物和3种醛酮类化合物,绝大部分大分子量气态产物的体积分数随煤温升高表现出规律性的增长趋势;煤氧化过程中大分子量气态产物的生成量高于热解过程,且仅在煤的氧化过程中检测到了醛酮类气态产物,说明醛酮类气态产物仅来源于煤的氧化反应;煤自燃大分子量气态产物的初始出现温度能有效填补使用常规标志气体时存在的预报空白区间.采用原位红外光谱分析技术分析了煤氧化过程中活性基团的变化规律,发现烃类基团的含量在煤温达到110℃后表现出明显的减少趋势,而含氧官能团的含量在煤氧化前期增长缓慢,当温度达到150℃后其增长速率明显增大.使用灰色关联分析法分析了煤氧化过程中大分子量气态产物与活性基团之间的关联度,结合灰色关联分析结果探讨了不同类型的煤自燃大分子量气态产物的生成机理.

关键词：煤自燃大分子量气态产物标志气体活性基团灰色关联分析

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