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安徽庐枞矿集区沙溪斑岩型铜金矿床中硒、碲的赋存状态及富集规律研究

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岩石学报 2024年第2期40卷 663-676页

作者：张亮王世伟范裕周涛发许龙江涧王延明涂文传合肥工业大学资源与环境工程学院合肥工业大学矿床成因与勘查技术研究中心合肥230009 安徽省矿产资源与矿山环境工程技术研究中心合肥230009 安徽铜冠(庐江)矿业有限公司合肥231561 安徽省地质矿产勘查局327地质队合肥230011

硒和碲是重要的战略性关键金属,在现代工业和国防建设中有着广泛的应用。硒和碲通常很难形成独立矿床,目前全球大部分硒和碲来自斑岩型铜金矿床。长江中下游成矿带是我国东部重要的斑岩-矽卡岩型铜金矿床成矿带之一,前人虽然对成矿带内... 详细信息

硒和碲是重要的战略性关键金属,在现代工业和国防建设中有着广泛的应用。硒和碲通常很难形成独立矿床,目前全球大部分硒和碲来自斑岩型铜金矿床。长江中下游成矿带是我国东部重要的斑岩-矽卡岩型铜金矿床成矿带之一,前人虽然对成矿带内矽卡岩型矿床中伴生关键金属已开展了相关研究,但对成矿带内斑岩矿床中关键金属的赋存状态、分布和富集规律尚关注较少。本次工作以成矿带内沙溪斑岩型铜金矿床为研究对象,系统采集了矿床不同深度、不同类型的岩矿石样品,通过扫描电子显微镜、全岩化学分析、TIMA及矿物原位LA-ICP-MS微量成分测试等分析技术方法对矿床中硒和碲等关键金属开展了系统的研究。结果表明,沙溪矿床中硒和碲元素发生显著富集,与主成矿元素铜具有明显的正相关关系。估算矿床中伴生硒资源量约为1196t、碲资源量约为96.6t,其中硒达到大型规模,具有潜在利用价值。与成矿带内其他典型矽卡岩矿床(包括斑岩-矽卡岩矿床)相比,沙溪斑岩型矿床中硒和碲的含量明显偏低,这可能是深部成矿岩浆演化过程的差异导致的。矿床中有91.64%的硒、87.48%的碲是以独立矿物形式存在。沙溪矿床硒、碲与主成矿元素铜和金的富集规律一致,流体混合过程中氧逸度的变化可能是硒和碲的主要的沉淀机制。

关键词：硒和碲赋存状态富集规律斑岩型铜金矿床长江中下游成矿带

安徽省池州抛刀岭金矿床金的赋存状态及成因研究

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合肥工业大学学报（自然科学版） 2024年第7期47卷 931-940,947页

作者：冷慧聪袁峰邓宇峰周涛发李跃合肥工业大学资源与环境工程学院安徽合肥230009 合肥工业大学矿床成因与勘查技术研究中心安徽合肥230009 安徽省矿产资源与矿山环境工程技术研究中心安徽合肥230009

抛刀岭金矿床位于长江中下游成矿带的安庆—贵池矿集区,该矿床矿体主要赋存于蚀变的英安玢岩岩体中。文章对该矿床岩石样品岩相学采用电子探针、激光剥蚀多接收电感耦合等离子体质谱仪等测试分析。结果表明:抛刀岭金矿床的矿石矿物主要... 详细信息

抛刀岭金矿床位于长江中下游成矿带的安庆—贵池矿集区,该矿床矿体主要赋存于蚀变的英安玢岩岩体中。文章对该矿床岩石样品岩相学采用电子探针、激光剥蚀多接收电感耦合等离子体质谱仪等测试分析。结果表明:抛刀岭金矿床的矿石矿物主要为黄铁矿、闪锌矿和毒砂等;脉石矿物主要为石英、方解石及黏土矿物;主要载金矿物为黄铁矿,其次为毒砂;Au主要以银金矿的形式存在上述矿物中。载金黄铁矿微量元素结果分析显示,Au与As、Cu、Pb、Zn等质量分数呈正相关,与Fe、S质量分数呈负相关,黄铁矿晶格中As的存在有利于Au代替Fe进入晶格中,使得Au在黄铁矿裂隙中沉淀。电子探针分析金的赋存状态显示,抛刀岭金矿床金主要以晶格金的形式存在于黄铁矿中,部分以银金矿的形式存在于黄铁矿和毒砂的裂隙中。矿床硫化物中的硫主要来源于岩浆,同时有少量的地层物质参与。混染成矿流体主要为来源于岩浆的出溶流体。

关键词：抛刀岭矿床斑岩型金矿黄铁矿银金矿地球化学金的赋存

安徽铜陵桂花冲铜金矿床的成矿条件与找矿潜力

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合肥工业大学学报（自然科学版） 2024年第8期47卷 1068-1079页

作者：刘军周涛发范裕陈静熊燕云刘杰添合肥工业大学资源与环境工程学院安徽合肥230009 安徽省矿产资源与矿山环境工程技术研究中心安徽合肥230009

桂花冲矿床位于铜陵矿集区和繁昌火山岩盆地之间的过渡区,是长江中下游成矿带中新类型的铜金多金属矿床。矿体主要呈透镜状、脉状,分别赋存于桂山岩体与三叠系南陵湖组灰岩地层的接触带和远端碳酸盐地层裂隙中。文章通过记录野外地质工... 详细信息

桂花冲矿床位于铜陵矿集区和繁昌火山岩盆地之间的过渡区,是长江中下游成矿带中新类型的铜金多金属矿床。矿体主要呈透镜状、脉状,分别赋存于桂山岩体与三叠系南陵湖组灰岩地层的接触带和远端碳酸盐地层裂隙中。文章通过记录野外地质工作及全岩地球化学特征,开展锆石U-Pb定年研究,发现矿区内青山岩体(花岗闪长斑岩)是成矿前岩体,桂山岩体(石英二长斑岩)是成矿岩体。对比铜陵—繁昌过渡区内姚家岭大型矿床研究发现,青山岩体与姚家岭早期岩体形成时代在140 Ma左右,青山岩体可能为姚家岭早期岩体延伸至桂花冲区域,后被推覆至地表;桂山岩体与姚家岭晚期岩体为成矿岩体,形成时代在138 Ma左右,两者可能在深部相连,是同一岩体的不同岩枝。综合桂花冲矿床控矿因素和成矿条件分析,探究该类矿床的成矿潜力和勘探方向,分析表明,在铜陵—繁昌过渡区的碳酸盐地层层间裂隙、褶皱滑脱区域、地层岩性显著变化位置以及形成时代在138 Ma左右的石英二长斑岩与黄龙组、栖霞组、孤峰组、大隆组、南陵湖组碳酸盐地层的接触带具有较好的找矿潜力。

关键词：锆石U-Pb定年地球化学桂花冲矿床铜陵—繁昌过渡区青山岩体桂山岩体

磺酸型阳离子树脂的元素分配行为及高精度同位素分析应用

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岩矿测试 2024年第1期43卷 63-75页

作者：王奇奇孙贺顾海欧侯振辉葛粲汪方跃周涛发合肥工业大学资源与环境工程学院安徽合肥2300092 中国科学技术大学地球和空间科学学院安徽合肥230026

不同元素在离子交换树脂的分配系数是元素纯化和分离的基础,不同酸中各元素分配系数差异可用于设计高效的元素提纯流程,从而被广泛应用于现代高精度同位素分析。本文以AG®50W-X8阳离子树脂为研究对象,以分配系数(Kd)作为量化指标,通过... 详细信息

不同元素在离子交换树脂的分配系数是元素纯化和分离的基础,不同酸中各元素分配系数差异可用于设计高效的元素提纯流程,从而被广泛应用于现代高精度同位素分析。本文以AG®50W-X8阳离子树脂为研究对象,以分配系数(Kd)作为量化指标,通过系统实验研究不同元素在该树脂中的分配行为。在前人研究基础上,本实验增加了元素数量和酸的种类,涵盖了金属、类金属、非金属和稀土元素。结果表明:在盐酸和硝酸介质中,几乎所有元素的Kd都与酸度呈负相关,当酸度达到6mol/L时,除Th和Ca以外的所有元素都会被酸洗脱。稀土元素(REEs)和高场强元素在0.1~0.5mol/L稀硝酸和稀盐酸中强烈吸附在树脂上;而一些过渡金属、类金属和非金属元素(如Mo、W、Re、Ir、Sb、Ge、As、Se、Te等)在酸溶液中会形成含氧阴离子,不与阳离子树脂发生吸附。Al、Fe、Se、Pd、Cd、In等元素在盐酸中易与氯离子形成配位化合物或离子团,导致这些离子在盐酸中的分配系数显著降低。在硝酸和盐酸与氢氟酸的混合酸中,除稀土元素外,绝大部分元素随酸度增加Kd迅速降低。稀土元素在盐酸-氢氟酸混合介质中,随着盐酸的浓度增加(从0.1mol/L盐酸-0.2mol/L氢氟酸至6mol/L盐酸-0.2mol/L氢氟酸),稀土元素分配系数(KdREE)具有先增加后降低的趋势。氢氟酸的加入可显著降低Be、Al、Sc、Fe、Sn、Th、U、Ti、Zr、Hf等元素在稀盐酸和稀硝酸中的分配系数,使这些元素几乎不与树脂发生吸附。本研究揭示了不同酸介质中各类元素在阳离子交换树脂上的分配行为存在差异,尤其是氢氟酸的加入可显著改变高场强元素、部分过渡金属和稀土元素的分配系数,为应用该树脂开发和优化适用于高精度金属稳定同位素分析的元素提纯流程(如Li、Mg、K、Sr、Ce、U等)提供了数据支撑,并可有效地减少后续实验设计的工作量。

关键词： BioRad AG®50W-X8阳离子树脂元素提纯高精度同位素分析分配系数离子交换柱

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Geochronology and Geochemistry of the Early Paleozoic Ore-host Volcanic Sequence in the Kalatag Area,East Tianshan,NW China:Implications for the Tectonic Evolution

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Acta Geologica Sinica(English Edition) 2023年第5期97卷 1372-1387页

作者： ZHANG Zhenlong YANG Fuquan zhou taofa GENG Xinxia ZHANG Zhixin YANG Chengdong QIU Zhanlin School of Resource Engineering Longyan UniversityLongyanFujian 364012China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China The National 305 Project Office of Xinjiang Urumuqi 830000China Xinjiang Research Center for Mineral Resources Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China

The East Tianshan contains many late Paleozoic magmatic and polymetallic *** studies demonstrate that the early Paleozoic volcanic rocks discovered in the northern region of East Tianshan can be subdivided into the Daliugou,Hongliuxia and Kalatag ***,we report zircon U-Pb ages of volcanic rocks and quartz diorite porphyry,together with whole-rock geochemical and Sr-Nd isotope data of early Paleozoic volcanic rocks,in order to investigate their petrogenesis and geodynamic *** U-Pb analyses of the rocks suggest that the Kalatag Formation formed at ca.438-413 *** characteristics of the early Paleozoic volcanic rocks exhibit typical subduction-related *** have high Mg^(#)(44-75),positiveε_(Nd)(t)values(0.25-7.88),low^(87)Sr/^(86)Sr ratios(0.70457 to 0.70588)and young two-stage Hf isotope model ages(551-446 Ma),consistent with a depleted mantle origin with limited crustal *** basaltic andesite and andesite have relatively high MgO contents(6.1-9.4 wt%),suggesting that they belong to high-magnesian *** were most likely derived from the partial melting of mantle peridotite caused by the addition of fluids released by subducted oceanic *** on regional geology,geochemical characteristics and previous studies,we infer that the southward subduction of the Junggar Ocean slab resulted in the generation of early Paleozoic volcanic rocks and arc setting-related metallogenic systems in the Kalatag area.

关键词： geodynamic setting VMS deposit petrogeochemistry Kalatag area East Tianshan

Combined garnet,scheelite and apatite U-Pb dating of mineralizing events in the Qiaomaishan Cu-W skarn deposit,eastern China

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Geoscience Frontiers 2023年第1期14卷 17-32页

作者： Yue Li Feng Yuan Simon M.Jowitt Xiangling Li taofa zhou Fangyue Wang Yufeng Deng Ore Deposit and Exploration Centre(ODEC) Hefei University of TechnologyHefei 23009China Anhui Province Engineering Research Center for Mineral Resources and Mine Environments Hefei 23009China Department of Geoscience University of Nevada Las Vegas4505 S.Maryland Pkwy.NV 89154-4010USA

Determining the precise timing of mineralization and mineralizing events is crucial to understanding regional mineralizing and other geological events and ***,there are a number of mineralogical and analytical limitations to the approaches developed for the absolute dating of mineralizing systems,such as molybdenite Re-Os and zircon and garnet U-Pb,among *** means that the precise and accurate dating of mineralizing systems that may not contain minerals suitable for dating using existing approaches requires the development of new(and ideally in situ)approaches to absolute *** study outlines a new in situ analytical approach that has the potential to rapidly and accurately evaluate the timing of ore *** study employs a novel application of in situ scheelite U-Pb dating analysis using laser ablation-inductively coupled plasma-mass spectrometry(LA-ICP-MS)and samples from the Qiaomaishan deposit,a representative example of skarn mineralization within the Xuancheng ore district of eastern *** approach to scheelite dating of the deposit is verified by cross-comparison to dating of cogenetic garnet and apatite,proving the effectiveness of this *** new approach to dating of scheelite-bearing geological systems is rapid,cheap,requires little sample preparation,and is undertaken in situ,allowing crucial geological and mineralogical context to be retained during *** approaches outlined here not only allow the determination of the absolute timing of formation of the Qiaomaishan deposit through the U-Pb dating of scheelite[138.6±3.2 Ma,N=39,mean square weighted deviation(MSWD)=1.17],garnet(138.4±1.0 Ma,N=40,MSWD=1.3),and apatite(139.6+3.3 Ma,N=35,MSWD=0.72),but also further supports the theoretical genetic links between this mineralization and the emplacement of a proximal porphyritic granodiorite intrusion(zircon U-Pb age:139.5±1.2 Ma,N=23,MSWD=0.3).Moreover,our research indicates that the higher the concentrations

关键词： In-situ scheelite U-Pb dating In-situ garnet U-Pb dating In-situ apatite U-Pb dating Qiaomaishan skarn deposit

Basement Characteristics and Crustal Evolution of the Copper-Gold Metallogenic Belt in the Middle and Lower Reaches of the Yangtze River:Some Isotope Constraints

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Acta Geologica Sinica(English Edition) 2000年第2期74卷 207-212页

作者： zhou taofa YUE Shucang Department of Resources and Environmental Science Hefei University of TechnologyTunxi Road 193Hefei 230009Anhui

Studies of the Pb, Sr and Nd isotopic composition of Mesozoic intrusive rocks indicate that the basement of the copper-gold metallogenic belt of the middle and lower reaches of the Yangtze River has “two-layer structure” and partly has “multi-layered structure”, and is inhomogeneous and shows the distinct feature of E-W provincialism. The calculated model lead ages (t1) are mostly greater than 2600 Ma, and the model neodymium ages (TDM) vary from 953 to 2276 Ma and concentrate in two time intervals: 1800–2000 Ma and 1200–1600 Ma. It is concluded that the basement of the MBYR is composed of the Late Archaeozoic to Middle Proterozoic metamorphic series and that the crust was initiated in the Archaean and continued to grow in the Early and Middle Proterozoic, and the proportion of new crust formed by mantle differentiation during the Late Proterozoic is low.

关键词： basement crustal age Pb Sr and Nd isotopes metallogenic belt of the middle and lower reaches of the Yangtze River

Cathodoluminescence and Trace Element Composition of Scheelite from the Middle-Lower Yangtze River Metallogenic Belt(MLYB): Implications for Mineralization and Exploration

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Acta Geologica Sinica(English Edition) 2020年第6期94卷 1977-1996页

作者： NIE Liqing zhou taofa CHEN Xuefeng WANG Fangyue XIAO Xin Ore Deposit and Exploration Centre(ODEC) School of Resources and Environmental EngineeringHefei University of TechnologyHefei 230009China School of Civil Engineering Anhui Jianzhu UniversityHefei 230601China Anhui Province Engineering Research Center for Mineral Resources and Mine Environments Hefei 230009China

The Middle-Lower Yangtze River Metallogenic Belt(MLYB)is known to contain abundant copper and iron porphyry-skarn deposits,with an increasing number of tungsten deposits and scheelite in Fe-Cu deposits being discovered in the MLYB during recent *** ore genesis of the newly-discovered tungsten mineralization in the MLYB is poorly *** investigate four sets of scheelite samples from tungsten,iron and copper deposits,using CL imaging and LA-ICP-MS techniques to reveal internal zonation patterns and trace element *** REE distribution patterns of four studied deposits show varying degrees of LREE enrichment with negative Eu *** oxygen fugacity of ore-forming fluid increased in Donggushan,while the oxygen fugacity of ore-forming fluid decreased in Ruanjiawan,Guilinzheng and *** scheelites from the Donggushan,Ruanjiawan,Guilinzheng and Gaojiabang deposits show enrichment in LREEs and HFSE,with Nb/La ratios ranging from 1.217 to 52.455,indicating that the four tungsten deposits are enriched in the volatile fluorine.A plot of(La/Lu)N versus Mo/δEu can be used to distinguish quartz vein type,porphyry and skarn tungsten *** study demonstrates that scheelite grains can be used to infer tungsten mineralization and are effective in identifying magmatic types of tungsten deposits in prospective mining sites.

关键词： scheelite trace elements tungsten mineralization Middle-Lower Yangtze River Metallogenic Belt

Geochemistry and Geochronology of the Causative Intrusion and a New Genetic Model Study of the Yaojialing Polymetallic Skarn Deposit, Tongling District, China

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Acta Geologica Sinica(English Edition) 2020年第6期94卷 1997-2011页

作者： XIONG Yanyun zhou taofa FAN Yu CHEN Jing LIU Jun School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China Anhui Mineral Resources and Mines Environmental Engineering Research Center Hefei 230009China

The Yaojialing deposit is the first large-scale Zn-Au-Cu polymetallic skarn deposit located in the Shatanjiao ore field of the Tongling area in the Middle-Lower Yangtze *** has distinct metallogenic characteristics and is clearly different from the known skarn Cu-Au deposits in the Tongling area and the Middle-Lower Yangtze *** studies of the Yaojialing deposit have included rock geochemistry,alteration and mineralization characteristics,as well as metallogenesis and metallogenic ***,there are still numerous problems concerning the coexistence of multiple elements,metallogenetic specialization of the magma and the metallogenic *** this study,using the latest production exploration work on the deposit,we investigated the Yaojialing deposit including its geological characteristics,petrography,LA-ICP MS zircon U-Pb dating and whole rock *** kinds of magmatic rocks have been distinguished for the first time in the deposit,amongst which the granodiorite porphyry exposed on the surface of the mining area,which is the host rock of the veined lead-zinc ore body,is the wall-rock intrusion;and the deep concealed quartz monzonite porphyry is the causative intrusion,the distribution of orebodies and wall-rock alteration characteristics showing regular zoning around the quartz monzonite ***^(206)Pb/^(238)U weighted average age of the granodiorite porphyry is 140.2±1.0 Ma(MSWD=0.85,n=13)by LA-ICP MS zircon U-Pb dating,while the quartz monzonite porphyry is 138.9±1.2 Ma(MSWD=0.60,n=16),which is consistent with petrographic *** geochemical characteristics show that the quartz monzonite porphyry is a high-K calc-alkaline series peraluminous *** trace element characteristics show that the quartz monzonite porphyry is enriched in LILE such as K,Rb,Sr,Ba and LREE,yet depleted in HFSE such as Nb,Ta,P and *** Yaojialing deposit shows the mineralization characteristics of proximal skarn and distal skarn,having the common

关键词： LA-ICP MS zircon U-Pb dating geochemistry Yaojialing deposit Tongling district