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Trace elemental behavior during chemical weathering: A case study of biotite-granitic weathering profile in Longnan, Jiangxi Province, China

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Chinese Science Bulletin 1999年第S2期44卷 130-132页

作者： ma yingjun and {2. {3. State Key laboratory of Environmental {3., Institute of {3., Chinese academy of sciences, Guiyang 550002. China State Key laboratory of Environmental geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

THE study of chemical weathering processes can provide significant insight into not only the behavior ofmigration, deposition and accumulation of REEs and other elements (e.g. Au, Fe, Al ), but also themechanism of material cycle on the surface of the earth, especially the relationship between detrital sediments and provenance. Lateritic profiles are widespread in southern China, where two kinds of valuable supergene deposit occur. One is "ion-adsorbed" REE {3. deposit; the other is lateritic gold {3. deposit. This study is to investigate the mobility and fractionation of major and trace elements and mineralogical variations during chemical weathering of biotite granite in Longnan, Jiangxi Province, China, andto provide significant data for a better understanding of the relationships between weathering of

关键词： chemical weathering trace elements rare earth element fractionation biotite-granite.

Geology and genesis of the Aqishan Pb-Zn deposit,NW China:Insights from mineralogy,geochemistry,and in situ U-Pb geochronology

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Geoscience Frontiers 2024年第5期15卷 489-514页

作者： Kang Wang Yinhong Wang Jun Deng Jiajun liu Fangfang zhang Wei zhang {3. zhang Wenxin Gu Hong Chen State Key laboratory of Geological Processes and Mineral Resources and School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China

The unique ore-forming processes and the key factors responsible for formation of skarn {2.s are still obscure,and challenges exist in the determination of timing of Pb-Zn skarns owing to lacking suitable mineral *** we present detailed paragenesis,bulk {3.,in situ U-Pb dating of zircon and garnet,and garnet oxygen isotopes together with in situ zircon Hf-O isotopes from the newly discovered Aqishan Pb-Zn {2. in the southern Central Asian Orogenic Belt(CAOB),northwest *** comprehensive data set revealed a Late Carboniferous subduction-related distal Pb-Zn skarn system associated with the granitic ***-ore stage garnets are generally subhedral to euhedral with oscillatory zoning and show slightly fractionated rare earth element patterns with positive Eu anomalies that point to an infiltration metasomatism origin under high water/rock *** syn-ore stage sphalerite is typically enriched in Mn and Cd and has moderate Zn/Cd ratios(3.7–482.,with a formation temperature of 2.5℃to 3.3.,which indicate magmatic-hydrothermal *** isocons defined by P_(2.O_(5)decipher that the principal factors for skarn formation were elevated activities of Fe,Ca,and Si species,where remobilization of Pb metals,meanwhile,contributed to ore-forming budgets to mineralizing *** U-Pb dating of zircons from granite porphyry that occurs distal to the skarns and Pb-Zn orebodies shows that these intrusions emplaced at ca.3.1.3.3.0.6 ma,recording the subduction of the Paleo-Tianshan oceanic *** garnets in close textural association with Pb-Zn sulfides yield indistinguishable in situ LA-ICP-MS U-Pb ages of 3.0.5±4.1 ***-rock {3. and in situ zircon Hf-O isotopes(δ^(18)O=4.6‰–6.0‰)indicate that the granite porphyry was derived from partial melting of juvenile crust and influenced by subducted oceanic *** isotope compositions of garnets(δ^(18)O=8.0‰–9.0‰)demonstrate that the equilibrated ore fluids

关键词： In situ U-Pb dating Garnet O isotopes Aqishan Pb-Zn deposit Skarn mineralization Southern CAOB

Dynamic processes of ore-forming fluid and the localization of orebody: case study on the sediment-hosted gold {2.s of southwestern Guizhou, China

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Chinese Science Bulletin 1999年第S2期44卷 263-265页

作者： zhang Chengbo and zhang Zheru Institute of {2., Chinese {3. of sciences, Guiyang 550002. China Institute of geochemistry Chinese Academy of Sciences Guiyang 550002 China

1 Geological setting and occurrence features of the sediment-hosted gold deposits OVER 100 sediment-hosted gold deposits and occurrences of southwestern Guizhou lie near the sonthemedge of the Yangtze craton, which is composed of crystalline rocks of Proterozoic age, overlain {2.inly byPaleozoic and Lower to Middle Triassic shallow-{2.rine platform and reef facies carbonates that gradesouthward and eastward into a thick section of interbedded siltstones and turbidite sandstones. Clasticdeposits were from the Yunkai Old Land and the Jiangnan Old Land respectively. The rocks were foldedand faulted during the Yanshanian orogeny, 190-65 {2. ago. Mineral deposits were {2.inly located inthe breccia horizon at the base of the Longtan For{2.tion of Upper Permian, underlain by the {2.ssive graylimestone of Lower Permian with a karst unconformity, and the high-angle fault zones in the Triassicargillaceous limestone interlayered with shale, arkose, and fine-grained turbidite sandstone. No

关键词： sediment-hosted gold deposits fossil hydrothermal system mathematical model.

新疆可可托海式伟晶岩型稀有金属矿床成矿机制

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岩石学报 2024年第9期40卷 2769-2785页

作者：张辉李国胜中国科学院地球化学研究所关键矿产成矿与预测重点实验室贵阳550081 中国科学院大学北京100049

可可托海3.脉形成于晚三叠世(~2.0ma),侵入于3.脉的白云母钠长石花岗岩形成于早侏罗世,而同时代的阿拉尔花岗岩不是稀有金属花岗岩。因此,3.脉不可能是花岗岩分异的产物,而是变质深熔成因。可可托海3.脉具有低的锆石ε_(Hf)(t)(+1.2...

可可托海3.脉形成于晚三叠世(~2.0ma),侵入于3.脉的白云母钠长石花岗岩形成于早侏罗世,而同时代的阿拉尔花岗岩不是稀有金属花岗岩。因此,3.脉不可能是花岗岩分异的产物,而是变质深熔成因。可可托海3.脉具有低的锆石ε_(Hf)(t)(+1.2.~+2.3.)、δ^(18)O (7.57‰~8.85‰)等特征,指示物源为新生地壳与古老地壳的混合物。可可托海3.脉经历了岩浆(Ⅰ-Ⅳ带)、岩浆-热液过渡(Ⅴ-Ⅷ带)和热液(Ⅸ带)阶段,伟晶岩经历了70%的分离结晶后进入晶体、熔体、流体共存的岩浆-热液过渡阶段。高分异伟晶岩以显著内部结构分带为特征,而结构单元也是伟晶岩的组成部分,与岩浆过冷条件下不平衡结晶或热液蚀变有关。Be矿化主要在3.脉岩钟体部分中的Ⅰ、Ⅱ、Ⅳ带,Li矿化主要产于Ⅴ、Ⅵ、Ⅷ带,指示3.脉铍、锂矿体分别形成于岩浆阶段和岩浆-热液过渡阶段。3.脉Ⅱ带中板状绿柱石与骸晶磷灰石、石榴子石和少量白云母共生,磷灰石结晶前后熔体体系的ASI显著变化,是导致3.脉Ⅱ带中大量绿柱石饱和结晶的成矿机制;从早期到晚期结构带,碱性长石和云母类矿物中K/Rb比值随Li、Rb、Cs含量增大而减小以及锆石中Zr/Hf比值随Hf含量增大而降低的分异趋势,指示岩浆分离结晶作用是伟晶岩型锂矿床中Li超常富集的主要机制。

关键词：源区特征岩石成因成矿时代成矿机制可可托海3.脉

新疆阿尔泰将军山天河石花岗岩的岩石成因及其对铷成矿的制约

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岩石学报 2024年第3期40卷 907-926页

作者：佘贵民刘堃周晋捷吕正航张辉中国科学院地球化学研究所地球内部物质高温高压实验室贵阳550081 中国科学院大学地球与行星科学学院北京100049

新疆阿尔泰盛产稀有金属伟晶岩,但缺乏数量上相当的高分异花岗岩。将军山天河石花岗岩是阿尔泰目前发现的唯一富Rb花岗岩,但其岩石成因、Rb的赋存状态及其与周边伟晶岩的关系尚不清楚,从而制约了对Rb富集机理和成矿潜力的认识。据此,本... 详细信息

新疆阿尔泰盛产稀有金属伟晶岩,但缺乏数量上相当的高分异花岗岩。将军山天河石花岗岩是阿尔泰目前发现的唯一富Rb花岗岩,但其岩石成因、Rb的赋存状态及其与周边伟晶岩的关系尚不清楚,从而制约了对Rb富集机理和成矿潜力的认识。据此,本文对将军山天河石花岗岩和伟晶岩开展了全岩组成、年代学、同位素和矿物学研究。结果显示,阿尔泰将军山天河石花岗岩为高分异的A型花岗岩,独居石U-Pb年龄为2.6.9±2.7ma,表明形成于早二叠世。独居石Nd同位素组成(ε_(Nd)(t)为+4.15~+6.05,二阶段模式年龄t DM2.548~708ma)显示亏损的源区特征,表明源自新生地壳或有幔源物质的参与。天河石花岗岩与周边的天河石伟晶岩具有空间、时间和成分上的联系,表明二者具有分异演化上的成因关系。将军山天河石花岗岩类型以及天河石伟晶岩矿物组合指示伟晶岩属于NYF族(富Nb、Y、F)。天河石花岗岩与伟晶岩都显示出Rb的矿化,矿石矿物主要为天河石和多硅白云母。从花岗岩到伟晶岩,天河石和云母中的Rb逐步富集。岩浆高度分异是天河石花岗岩Rb富集的主要机制,但新生地壳物源或幔源物质的加入从源区上限制了Rb的矿化程度。除天河石花岗岩以外,阿尔泰未来的Rb资源勘查应同时关注稀有金属伟晶岩中的钾长石和云母类矿物。

关键词：天河石花岗岩伟晶岩岩石成因阿尔泰

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东昆仑库德尔特金多金属矿床闪长玢岩年龄、地球化学特征及形成环境

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地质通报 2024年第7期43卷 1133-1148页

作者：刘光莲汪周鑫张大明张勇刘智刚马忠元青海省第三地质勘查院青海西宁810029 河北地质大学地球科学学院河北石家庄050031

为厘定卡尔却卡矿田内的库德尔特金多金属矿床金矿成矿时代及其形成构造环境,对闪长玢岩进行了锆石U-Pb同位素测年和全岩地球化学研究。结果表明,闪长玢岩锆石U-Pb年龄加权平均值为2.2.6±1.0 ma(MSWD=0.17),略晚于赋存金矿的花岗闪长... 详细信息

为厘定卡尔却卡矿田内的库德尔特金多金属矿床金矿成矿时代及其形成构造环境,对闪长玢岩进行了锆石U-Pb同位素测年和全岩地球化学研究。结果表明,闪长玢岩锆石U-Pb年龄加权平均值为2.2.6±1.0 ma(MSWD=0.17),略晚于赋存金矿的花岗闪长岩年龄(2.4~2.4.1 ma)和金矿化绢云母Ar-Ar坪年龄(2.6.7±4.0 ma),限定金成矿上限年龄不晚于2.3.ma。闪长玢岩SiO_(2.含量为54.96%~55.57%,富Al(Al_(2.O_(3.含量为17.94%~18.07%),高Sr(455×10^(−6)~505×10^(−6)),低Y(19.2.10^(−6)~2..4×10^(−6))和Yb(2.18×10^(−6)~2.95×10^(−6)),A/CNK值为0.87~0.89,属高钾钙碱性准铝质系列。岩石轻、重稀土元素分馏较明显,轻稀土元素富集,LREE/HREE值为6.2.~8.69,(La/Yb)N值为7.2.~10.3.,Eu中等亏损,富集大离子亲石元素(Rb、Th、U、K等),亏损高场强元素(Nb、Ta、P、Ti等),具有较高Sr/Yb值(154.2.~2.6.74)、Sr/Y值(17.2.~2..2.)、Nb/Ta值(17.79~2..05)和Mg#值(49.3.~50.18),Rb/Sr值(0.2.~0.3.)介于0.05~0.5之间。综合区域地质背景与成矿特点认为,闪长玢岩形成于俯冲-碰撞转换构造阶段幔源岩浆底侵中元古代下地壳的局部熔融,中晚三叠世俯冲-碰撞转换时期,东昆仑地区受俯冲板片断离影响处于伸展环境,与典型挤压造山带具有明显差异,强烈壳-幔相互作用促进了区内矿床的集中产出。

关键词：年代学地球化学构造环境闪长玢岩库德尔特金多金属矿床东昆仑

Determination of Rare Earth Elements in Geological Samples by Inductively Coupled Plasma Atomic Emission Spectrometry with Flow Injection Liquid-liquid Extraction

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Determination of Rare Earth Elements in Geological Samples b...

The Weixi High-silica Granitoids in the Central Sanjiang Orogenic Belt,Southwest China:Implications for Growth of the Continental Crust

中国科学院地质与地球物理研究所2.03.术年会

作者： Zhifang Xu,~(*+) congqiang liu,~(**) Hongxiang {2.,~* {3. ma,~* and Soulin LIN~(***) *Institute of Geology and Geophysics,Chinese {3. of sciences,Beijing 10002., People’s Republic of China **Institute of geochemistry,Chinese {3. of sciences,Guiyang 550002.People’s Republic of China ***Department of Applied Chemistry,China University of Geosciences,Wuhan 43.074, People’s Republic of China

A direct sampling with organic solvent extracts for simultaneous multi-element determination implemented with inductively coupled plasma atomic emission spectrometry(ICP-AES) associated with a flow injection liquid-liquid extraction(FI-LLE) sample preconcentration method was ***"robustness"of the plasma discharge with tributyl phosphate(TBP) loading was diagnosed by using the MgⅡ2.9.55 nm and MgⅠ2.5.2. nm lines intensity ratio.A FI-LLE preconcentration system for rare earth elements(REEs)-nitrate-TBP was established by using a {2.-designed phase *** these elements,an average sensitivity enhancement factor of 64 was obtained with respect to ICP-AES sampling with aqueous *** precision of the method was characterized by a relative standard deviation (%RSD) of 1.8 - 5.2..A throughput of 2. samples per hour can be achieved with an organic solvent consumption of less than 2.0μl per *** results were obtained for the analysis of standard reference materials.

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Acta Geologica Sinica(English Edition) 2024年第3期98卷 641-656页

作者： WANG Qiuyu CHEN Shouming zhang Hongrui LI Saisai SinoProbe laboratory Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China Guangxi Key laboratory of Hidden Metallic ore {2. Exploration GuilinGuangxi 541004China

High-silica granitoids record the formation and evolution of the continental crust.A new intrusive complex has been recognized among silicic volcanic rocks of the Weixi arc,Southwest *** intrusions consist of granites,granitic porphyries,and *** U-Pb age data indicate that the Weixi granitoids formed at 2.8-2.0 ma and were coeval with silicic volcanic rocks of the Weixi *** Weixi granitoids are enriched in Rb,Th,and U,depleted in Ba,Sr,Nb,Ta,and Ti,and have high light/heavy rare earth element ratios and slightly negative Eu *** Weixi granitoids have negative ε_(Nd)(t)values(-9.8 to-7.8)and negative zircon ε_(Hf)(t)values(-12.02.to-5.11).The geochemical and isotopic features suggest the Weixi granitoids were derived by partial melting of ancient crustal *** Weixi granitoids and silicic volcanic rocks were derived from the same magma by crystal accumulation and melt extraction,respectively,and they record the formation of a continental arc in the central Sanjiang orogenic belt.

关键词： granitoids geochemistry crystal accumulation continental crust Sanjiang orogen

LA-ICP-MS U-Pb Zircon Geochronology,geochemistry and Kinetics of Wenquan ore-Bearing Granites from Western Qinling,China

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矿物学报 2009年第S1期29卷 298-300页

作者： CAO Xiao-feng1,2.Lü Xin-biao1,2.CHEN Chao2.{3. Shen-tai2.zhang Ping2.SU Yu-yun2.MEI Wei2.zhang Bin3.1. State Key laboratory of Geological Processes and Mineral Resources,China University of Geo{3.,Wuhan 43.074,China 2. China Resource Department,China University of Geo{3.,Wuhan 43.074,China)

As we know there is a famous East Qinling-Dabie molybdenum belt in china,where many molybdenum deposits located such as super giant Jinduicheng,Sandaozhuang,Shangfanggou and Nannihu molybdenum deposits(Li,{3.08) ;The molybdenum mineralization in the East Qinling-Dabie belt clusters into three groups or mineralization pulses:{3.3.{3.1,148-13. and 13.-11{3.ma(mao et al,{3.08).

关键词： Pb LA-ICP-MS U-Pb Zircon Geochronology,geochemistry and Kinetics of Wenquan ore-Bearing Granites from Western Qinling,China ICP MS