检索结果-南通市图书馆

chinese Science Bulletin 1999年第S2期44卷 227-230页

作者： deng hailin~1,{1., zhou yunman~2 and wang congwu~2 1. open laboratory of ore deposit geochemistry, institute of geochemistry, chinese academy of sciences, guiyang 550002, china 2. No.3 Braneh of No.1.Geology Party, Yunnan Bureau of Geology and Mineral Resources, Xundian 655205, china open {1. of ore deposit geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China No. 3 Branch No. 1 Geology Party Yunnan Bureau of Geology and Mineral Resources Xundian 655205 China

IN the study of hydrothermal deposits sulfur isotopes bear much information about the source of sulfur,{1.-forming temperature, the evolution of {1.-forming fluids and the mechanism of metallogenesis. Todetermine whether sulfur isotopes reach equilibrium between fluids and sulfur-bearing minerals precipitated from the former and among the sulfur-bearing minerals is the key to the application of sulfur isotopegeochemistry to geological problems. As it has been commonly accepted that sulfur isotopic equilibrium could not be reached between sulfate and sulfide below 350℃, little attention has been paid to thepossible mechanism of sulfur isotope equilibrium between sulfate and sulfide below 300℃. However, this note presents an example to show sulfur isotope equilibrium between barite and sulfate

关键词： sulfur isotope Lemachang independent Ag deposit barite freibergite sulfur isotope equilibrium below 300℃.

Oxygen isotope as a tracer of REE fractionation in water-rock interaction

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1999年第S2期44卷 224-226页

作者： deng hailin~1, li chaoyang~1, zhou yunman~2 and wang Chongwu~2 1. open laboratory of ore deposit geochemistry, institute of geochemistry chinese academy of sciences, guiyang 550002, china 2. No.1 Geological Party, Yunnan Bureau of Geology and Mineral Resources, Xundian 655205, china open {1. of ore deposit geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China No. 1.Geological Party Yunnan Bureau of Geology and Mineral Resources Xundian 655205 China

STABLE oxygen isotope is not only an effective approach to tracing water-rock interactions, but also canprovide much information about ore-forming temperature and source and evolution of ore fluids in thestudy of hydrothermal deposits. The rare-earth elements (REE) can be used to trace the sources ofore-forming materials and can also, to some extent, indicate the physical and chemical properties of fluids in the geochemical processes. The combination of these two aspects of research can effectivelyprobe into the geochemical behavior and evolution of REE in the process of water-rock interaction duringhydrothermal ore deposition. On the other hand, the essence of REE as tracers in hydrothermal mineralization can be better understood. In this note the Lemachang independent Ag deposit in northeastern Yunnan is selected for a case study.

关键词： oxygen isotope tracer water-rock interaction REE fractionation.

LA-ICP-MS zircon U-Pb dating of tuffites in the Sachakou Pb-Zn mining area, Karakorum, Xinjiang and its establishment of Early Triassic strata

在线全文

学校读者我要写书评

暂无评论

china Geology 2024年第1期7卷 150-152页

作者： Xiao-jian Zhao Nuo li Kai Weng Ming {1. Qing-lin Sui deng-hui Chen zhou-ping Guo Meng-qi Jin Xi’an Center China Geological SurveyMinistry of Natural ResourcesXi’an 710054China Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China College of Geography and Remote Sensing sciences Xinjiang UniversityUrumqi 830046China University of chinese academy of sciences Beijing 100029China No.8 Geological Party Xinjiang Bureau of Geology and Mineral Exploration and DevelopmentAksu 843000China School of Resource&Environment and Safety Engineering University of South ChinaHengyang 421001China

*** In the past decade,a group of medium to giant lead-zinc deposits,represented by Huoshaoyun,Sachakou,and Yuanbao{1.ng,have been discovered in the Aksai Chin region of Karakoram,*** are all located in the Mesozoic carbonate and clastic rock *** Sachakou leadzinc mining area is adjacent to the northwest of the Huoshaoyun lead-zinc mining area and is in the same stratigraphic layer as *** many scholars have been arguing about the type and age of Huoshaoyun lead-zinc minera{1.zation,few scholars have paid attention to the classification of the ore-bearing strata in the *** stratigraphy of the Lower Permian Shenxianwan Group to the Upper Cretaceous Tielongtan Group is exposed in the Sachakou area of Karakorum,Xinjiang,however,the Late Permian-Early Triassic stratigraphy is missing(Fig.1.).Due to the harsh natural conditions in the area and the low level of work,the stratigraphic de{1.neation is not exhaustive,and the regional {1.thology is dominated by carbonates and clastic rocks,which makes it difficult to identify the age of the regional {1.thology and causes problems for the exploration and research of lead-zinc in the area.

关键词： strata Triassic Xinjiang

Geochemical constraints from hydrothermal fluid inclusions of altered deformation zone type Au(Ag)deposits in Yunkai area, South{1.

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1999年第S2期44卷 230-232页

作者： wang Zuwei~1. ZHANG Haihua~2, YAO Dong{1.ang~2 and zhou Yongzhang~3 1. Department of Geography, Tianjin Normal University, Tianjin 300071. china 2. Guangzhou institute of geochemistry, chinese academy of sciences, Guangzhou 51.640, china 3. Department of Earth sciences, Zhongshan University, Guangzhou 51.275, china eeszhou@*** Department of Geography Tianjin Normal University Tianjin 300071 China Guangzhou{1. Chinese Academy of Sciences Guangzhou 510640 China Department of Earth sciences Zhongshan University Guangzhou 510275 China

THE altered deformation zone type Au (Ag) deposits share an important part from the precious metal{1.core deposits in the Yunkai area, South china. Their formation is a history of poly-stage evolution. Pre- {1.minary source strata, Ca{1.doniam metamorphism, Indosinian-Yanshanian ductile shear deformation andassociated hydrotheraml alteration all play certain roles in the history. This note discusses the geochemical conditional of the hydrothermal fluids during minera{1.zation. Two representative ore deposits, the Pangxidong Ag(Au) deposit and Hetai Au deposits are selectedfor this study. They are hosted in altered ductile shear zones. Wall-rock hydrothermal alteration is bothspatially and temporally associated with the development of the ductile shear system. Si{1.cification occurred throughout the whole alteration process. There are three groups of quartz: thepredeformational quartz, the early stage hydrothermal quartz, and the late stage hydrothermal quartz asso-

关键词： precious metallic deposit fluid inclusions mineralizing fluid South china.

Geological Characteristics and Its Metallogenesis of Daolundaba Copper Polymetallic {1.s,Inner Mongolia

在线全文

学校读者我要写书评

暂无评论

矿物学报 2011年第S1期31卷 86-87页

作者： PAN Xiao-fei1.HOU Zeng-qian1.wang Shuo2,TONG Ying1.XUE Huai-min1.{1. Xi-wen1.XIE Yu-ling3(1.institute of Geology,chinese academy of Geological sciences,Beijing 1.0037,china 2.Inner Mongolia Geological Prospecting limited Company,01.020,china 3.University of Science and Tectonlogy Beijing,Beijing 1.0029,china)

1.Geology Daolundaba copper polymetallic {1. occurs in West Ujimqin Banner,the Xilin Gol League of Inner Mongolia,along the west side of South part of Daxinganling ore belt,whose tectonic position just lies at the junction of Siberian Block in the south part,North china Block in the north and Songliao block in the *** Daolundaba copper polymetallic {1. is hosted by the Lower Proterozoic Baoyintu group of biotite-plagioclase gneiss(Pt1.y),upper Permian linxi formation of sandy slate(P2l),and the Hercynian Qianjinchang pluton of biotite granite.

关键词： In Geological Characteristics and Its Metallogenesis of Daolundaba Copper Polymetallic {1.s,Inner Mongolia Pb

在线全文

学校读者我要写书评

暂无评论

交代地幔源区与造山带铜镍成矿作用

岩石学报 2024年第1期40卷 60-78页

作者：薛胜超刘金宇周翊辛雨姚卓森王庆飞邓军中国地质大学地质过程与矿产资源国家重点实验室地球科学与资源学院北京100083 国家自然博物馆北京100050 西南石油大学地球科学与技术学院成都610500 中国地质大学地质过程与矿产资源国家重点实验室资源学院武汉430074

造山带具有复杂的动力学环境、俯冲交代历史和热力学状态,其地幔源区物质组成、熔融机制和岩浆产物明显不同于地幔柱和大陆裂谷带,因此造山带环境中与镁铁-超镁铁质岩浆有关的铜镍成矿作用有别于板内环境。本文综述了交代地幔源区与造... 详细信息

造山带具有复杂的动力学环境、俯冲交代历史和热力学状态,其地幔源区物质组成、熔融机制和岩浆产物明显不同于地幔柱和大陆裂谷带,因此造山带环境中与镁铁-超镁铁质岩浆有关的铜镍成矿作用有别于板内环境。本文综述了交代地幔源区与造山带铜镍成矿关系的新进展,重点聚焦于:(1.岩石圈与软流圈的贡献。成矿岩浆来源于上涌的软流圈驱动交代岩石圈地幔不同程度的混合熔融,其中后俯冲阶段岩浆产物的成矿作用最为普遍、规模最大;岩石圈地幔经历不同比例俯冲板片沉积物熔体(富钙沉积物)和低温蚀变洋壳流体交代,具有显著的富挥发分和碳酸盐特征。(2)幔源岩浆氧化还原状态对成矿的约束。显生宙造山带成矿初始岩浆(硫化物未发生饱和)可能普遍为氧化性岩浆,岩浆体系硫化物饱和前后存在氧逸度骤降,导致岩浆体系硫化物饱和时硫的溶解度呈指数级下降,直接触发硫化物熔离,或者为达到熔离创造低的硫溶解度条件,其中岩浆还原作用由碳质物在岩浆期的有效混染造成。(3)挥发分对岩浆硫化物的运载汇聚。挥发分显著降低熔体粘度,从而减小粘滞阻力对岩浆超压的消耗;岩浆在上侵减压过程中挥发分能够发生出溶-成核作用,形成大量低密度气泡并与硫化物液滴形成复合液滴,促进硫化物液滴聚结,提高其成矿元素含量,并向上输运硫化物。总之,全球部分典型铜镍成矿省与交代地幔时空耦合关系表明,地幔具交代属性可能一定程度上促进了岩浆硫化物成矿。尽管交代地幔对造山带铜镍成矿的贡献方面取得了诸多重要进展,但前寒武造山带幔源岩浆氧化还原状态对成矿的影响、造山带镍铜钴成矿多样性、经历不同交代作用的地幔源区熔融过程中亲铜元素的行为机制、壳幔圈层内挥发分循环对亲铜元素迁移-富集的控制作用等领域仍需深入研究。

关键词：铜镍矿交代地幔源区岩浆还原作用挥发分造山带

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

胶东型金矿

岩石学报 2024年第6期40卷 1691-1711页

作者：杨立强邓军张良杨伟谢东汪龙邱昆峰李大鹏中国地质大学地质过程与矿产资源国家重点实验室深时数字地球前沿科学中心北京100083 自然资源部金矿成矿过程与资源利用重点实验室山东省金属矿产成矿地质过程与资源利用重点实验室山东省地质科学研究院济南250013 山东黄金地质研究院济南250101

胶东是全球唯一已知赋存于前寒武纪变质地体中的晚中生代巨型金矿省,其成矿系统独具特色,具体表现为:(1.位于陆内复合构造域,经历了多期重大构造-热事件,大规模金成矿作用受控于1.0±2Ma古太平洋板块俯冲方向变化及其诱发的软流圈上涌... 详细信息

胶东是全球唯一已知赋存于前寒武纪变质地体中的晚中生代巨型金矿省,其成矿系统独具特色,具体表现为:(1.位于陆内复合构造域,经历了多期重大构造-热事件,大规模金成矿作用受控于1.0±2Ma古太平洋板块俯冲方向变化及其诱发的软流圈上涌、岩石圈改造和伸展-挤压变形交替及控矿断裂剪压-剪张转换;(2)多重控矿构造和多样赋矿建造联合控制了不同规模和类型金矿的发育,形成了三山岛、焦家、招平、栖霞、郭即和牟乳六条NE向金矿带和三山岛-栖霞EW向富金廊带,导致了金矿化类型(焦家式/破碎带蚀变岩型、玲珑式/石英脉型、蓬家夼式/蚀变砾岩±角砾岩型、辽上式/黄铁矿-碳酸盐脉型)及其地质-地球化学特征的多样性;(3)主要矿化元素Au、Ag、Cu、Pb和Zn均达到工业利用要求,并有多种共/伴生关键金属超常富集;(4)不同金矿带中硫化物Pb同位素组成与探明金资源储量及到郯庐断裂带的距离线性相关,反映距离幔源流体主通道越近、金属硫化物中放射性成因Pb含量和幔源组分占比越多、金成矿强度越大;(5)区域总体相对均一的Δ1.9 Hg(平均~0.01.‰)及Δ1.9 Hg/Δ201.Hg与金品位呈线性负相关,表明成矿物质来源于富集岩石圈地幔、且地幔被俯冲洋壳及其上覆沉积物交代的程度控制了金品位的高低;(6)区域恒定的Δ33 S同位素组成(~0‰)排除了巨量金源自太古宙变质基底及其重熔花岗岩的可能,重的δ34 S(平均9.0±3.7‰)来源于俯冲的古太平洋板片及其上覆沉积物的脱挥发份;不同金矿带Δ33 S/δ34 S与探明金资源储量及其到郯庐断裂带距离线性相关,反映成矿期地壳伸展程度控制了金成矿强度;(7)区域He-Ar和H-O同位素组成显示壳幔混合特征,焦家式金矿的成矿流体组成更靠近地幔、玲珑式金矿位于地幔与地壳过渡带;三山岛、焦家和招平金矿带的成矿流体相对接近幔源流体,而郭即金矿带具有相对开放的构造环境;不同金矿带氢-氧同位素组成和探明金资源储量正相关,可能表征了从西到东成矿流体通量和流体-岩石反应强度逐渐降低。基于对上述特征的总结,提出了胶东型金矿的成因模式,明确了其成矿地球动力学背景和深部驱动、巨量金属和流体及络合物来源、输运通道和方式、源→汇过程和机制、成矿后变化和保存等成矿系统形成的关键因素,确立了“拆离断裂系与基底活化带及幔源流体通道复合控矿”的勘查思路和“四步式”的勘查模型。综上,胶东金矿不同尺度的鉴别特征及其形成的关键因素明显不同于全球已知的其他金矿类型,难以被已有成矿模式所涵盖,属于一种新的金矿类型——胶东型,其成因模式对华北、华南、西伯利亚、西澳伊尔岗、北美怀俄明和南美圭亚那等陆内金矿床具有普适性;系列找矿突破则验证了该成因模式与勘查模型的合理性和适用性。因此,本文认为胶东型金矿是全球研究热点和重要的金矿勘查方向,而该地区找矿的主攻目标是资源量大且品位和产状稳定的破碎带蚀变岩型金矿。

关键词：矿床地质-地球化学特征成矿系统时-空结构成矿动力学控矿因素成因及勘查模型胶东型金矿

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

锑矿周边土-蔬金属元素富集特征与风险评估

环境科学与技术 2024年第6期47卷 27-35页

作者：周赛军邹佳蓉焦泳郑志杰邓仁健王闯邓明君湖南科技大学土木工程学院湖南湘潭411100 湖南医药学院医学人文与信息管理学院湖南怀化418000

为揭示不同锑矿废渣堆放区周围土壤-蔬菜系统中潜在有害重金属元素(PTEs)的富集特征及健康风险,该文以不同种类废渣堆场(锑矿废石、锑矿冶炼渣、锑矿尾砂)周围3处村落及在废渣共同影响下的琏溪河下游的1.村落为采样区,并以采样区域内... 详细信息

为揭示不同锑矿废渣堆放区周围土壤-蔬菜系统中潜在有害重金属元素(PTEs)的富集特征及健康风险,该文以不同种类废渣堆场(锑矿废石、锑矿冶炼渣、锑矿尾砂)周围3处村落及在废渣共同影响下的琏溪河下游的1.村落为采样区,并以采样区域内的土壤-蔬菜系统为研究对象。运用统计学、迁移系数法和体外消化模拟法等方法对土壤和蔬菜样品中的Sb、As、Hg、Pb、Cd和Zn等6种PTE的富集特征及健康风险评估进行讨论。结果表明,6种PTEs在土壤中的平均含量均超过湖南省土壤背景值及风险筛选值。所有蔬菜样品对土壤PTEs的吸收能力弱,生物累积系数平均值低于0.1.。蔬菜样品的PTEs中Pb、Cd、Zn的生物转移系数数值均超过1.0,易被蔬菜富集。4个采样区中,锑的暴露风险指数均大于1.0,对人体存在明显的健康风险。用于评价复合污染危害的指数HI在4个采样区均大于2.0,主要PTEs污染因子为Sb和Pb,复合污染已对人体存在健康风险。研究表明,4个采样区的土壤已受到多种PTEs的污染与富集,蔬菜对当地居民均存在健康风险,需要特别关注。

关键词：锡矿山潜在有害金属元素(PTEs) 土壤-蔬菜系统富集特征健康风险评估

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

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2023年第3期42卷 552-571页

作者： Teng deng Longyue {1. 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-{1. 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 c{1.s 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-{1. carbonate(siderite)-*** modeling demonstrates that both ripidolite and siderite can result in sulfidation and theref{1. gold *** a result,this study demonstrates that pre-{1. 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 {1. Hydrothermal alteration Fe-bearing minerals

Sulfur Isotopes geochemistry of the Nage Cu-Pb Polymetal{1.c deposit,Southeast Guizhou Province,china

在线全文

学校读者我要写书评

暂无评论

矿物学报 2009年第S1期29卷 128-128页

作者： LONG Xuan-lin1,zhou Jia-xi2,HUANG Zhi-long2,wang Jing-song1,YANG De-zhi1,3,FAN liang-wu2,BAO Guang-ping2,liU Yong-kun1(1. The 102 Geological Team,Guizhou Bureau of Exploration and Development of Geology and Mineral Resources,Zunyi 563003,china 2. State key laboratory of ore deposits geochemistry,institute of geochemistry,chinese academy of Science,guiyang 550002,china 3. china University of Geosciences(Wuhan) ,Wuhan 430074,china) evidence.

The Nage Cu-Pb polymetallic {1. is located in the transitional zone of the Yangtze craton and cathaysia,that is the southwest of Jiangnan orogenic belt. The mainly strata are Wentong formation of Mesoproterozoic Sibo group and the Jialu formation(Qbj) ,Wuye formation(Qbw) ,Fanzhao formation(Qbf) and Gongdong formation(Qbg) of the Neoproterozoic Qingbaikou System Xiajiang group.

关键词： Pb Sulfur Isotopes geochemistry of the Nage Cu-Pb Polymetal{1.c deposit,Southeast Guizhou Province,china Cu