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Advances in Isotope Geochronology and Isotope Geochemistry:A Preface

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Journal of Earth Science 2022年第1期33卷 1-4页

作者： Xiangkun Zhu zaicong wang Huayong Chen MLR Key Laboratory of Isotope Geology Institute of Geology Chinese Academy of Geological Sciences State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences China University of Geosciences Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of Geochemistry Chinese Academy of Sciences

Isotope geochronology and isotope geochemistry are important branches of geochemistry. They are based on variations in radiogenic or stable isotope ratios of elements and provide key chemical fingerprints to understand dynamic evolution of the Earth and other planetary bodies from the past to the present, and from their interior to exterior systems.

关键词： isotope geochemistry planetary

The distribution,characteristics and fluid sources of lode gold deposits:An overview

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Science China Earth Sciences 2021年第9期64卷 1463-1480页

作者： Christina Yan wang Bo WEI Wei TAN zaicong wang Qingdong ZENG CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou510640China CAS Center for Excellence in Deep Earth Science Chinese Academy of SciencesGuangzhou510640China State Key Laboratory of Geological Processes and Mineral Resources(GPMR) School of Earth SciencesChina University of GeosciencesWuhan430074China Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Institutions of Earth Science Chinese Academy of SciencesBeijing100029China University of Chinese Academy of Sciences Beijing100029China

Lode gold deposits are among the most economically important types of gold deposits in the ***,they formed mainly in three time intervals,2.8 to 2.5 Ga,2.1 to 1.8 Ga,and 700 Ma to the *** of ore-forming fluids and other components are of critical importance in a better understanding of the genesis and the geodynamic controls of these *** ore-forming fluids were mostly derived from devolatization of sedimentary and/or volcanic sequences during greenschist to amphibolite facies metamorphism associated with orogenic deformation,magmatic hydrothermal fluids have been increasingly shown to be important in many gold deposits in various *** this review paper,we summarize the major features of lode gold deposits,possible sources of ore-forming fluids,and mechanisms of gold *** we acknowledge the critical role of metamorphically derived fluids in the genesis of such deposits worldwide,we emphasize that mantle-or basaltic magma-derived fluids may have been much more important than commonly *** use the Liaodong peninsula of the North China Craton as an example to demonstrate the significance of mantle-derived *** earlier studies and new data,we show that some of the late Mesozoic lode gold deposits in the North China Craton may have formed from magmatic hydrothermal fluids due to the extension and partial melting of the hydrated,metasomatized subcontinental lithosphere mantle,as best exemplified by the Wulong gold deposit.

关键词： Lode gold deposit Ore-forming fluid Metasomatized subcontinental lithosphere mantle Mantle-derived melt/fluid North China Craton

Accurate Determination of Zr Isotopic Ratio in Zircons by Femtosecond Laser Ablation MC-ICP-MS with “Wet” Plasma Technique

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Journal of Earth Science 2022年第1期33卷 67-75页

作者： Wen Zhang Zhaochu Hu Lanping Feng zaicong wang Yongsheng Liu Yantong Feng Hong Liu State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China

This work evaluates the use of femtosecond laser ablation multiple collector inductively coupled plasma mass spectrometry(fs-LA-MC-ICP-MS) for Zr isotopic analysis in zircons. The mass fractionation caused by instrumental mass discrimination was corrected by a combination of internal correction using Sr as an internal standard(coming from a NIST SRM 987 standard solution) and external correction using a matrix-matched standard. Several important instrument parameters were investigated, such as the effect of the addition of N;and "wet" plasma condition, the mass fractionation behaviors between Zr isotopes and Sr isotopes, the position effect in laser ablation cell and the effect of laser ablation parameters(laser spot size and energy density). The Zr isotope compositions of seven zircons(GJ-1, 91500, Ple?ovice, Rak-17, Paki, Aus and Mala) were determined by the developed fs-LAMC-ICP-MS and thermal ionization mass spectrometry(TIMS). Our fs-LA-MC-ICP-MS results for Zr isotope compositions agreed with TIMS analyses within analytical uncertainties, indicating the presented method is a suitable tool to resolve isotopic zoning in natural zircons. The results also suggest that GJ-1, 91500, Ple?ovice, Paki, Aus and Mala had the homogenous Zr isotope composition and could be considered as the potential candidates for the Zr isotope analysis in zircons, except Rak-17 which presented the large Zr isotope variation.

关键词： Zr isotope analysis zircon LA-MC-ICP-MS reference materials

A novel method for simultaneous analysis of particle size and mineralogy for Chang’E-5 lunar soil with minimum sample consumption

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Science China Earth Sciences 2022年第9期65卷 1704-1714页

作者： Kenan CAO Mingtan DONG Zhenbing SHE Qian XIAO Xinyi wang Yuqi QIAN Yiheng LI zaicong wang Qi HE Xiang WU Keqing ZONG Zhaochu HU Long XIAO State Key Laboratory of Biogeology and Environmental Geology School of Earth SciencesChina University of GeosciencesWuhan 430078China School of Environmental Studies China University of GeosciencesWuhan 430078China State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430078China

The successful return of lunar soil samples from the northern Oceanus Procellarum by the Chang’E 5(CE-5) mission has provided unprecedented ground-truth information for the previously unexplored region of the Moon. In particular, the particle size and mineral constituents of the CE-5 soil samples are of critical importance to interpret remote sensing data. With a Raman-based particle analysis system, we show that the particle size properties and mineral constituents of the CE-5 soil can be simultaneously determined with a small sample size(ca. 30 μg). The CE-5 sample scooped from the lunar surface has an overall small size between 0.4 μm and 73.9 μm(mean=3.5 μm), and mainly consists of pyroxene(39.4%), plagioclase(37.5%), olivine(9.8%), Fe-Ti oxides(1.9%), glass(8.3%) and other minor or trace phases. The results are consistent with previous analyses with larger sample sizes. In addition to minimum sample consumption, this method requires very little sample preparation, and can rapidly build a large database with each particle precisely traceable. Therefore, this novel technique is particularly suitable for the analysis of future returned soil samples from extraterrestrial bodies.

关键词： Raman-based particle analysis Modal abundance Size-dependent mineralogy Laser-induced oxidation

绿松石低温生长过程中Cu同位素特征及其对产地溯源的意义

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地球科学 2022年第4期47卷 1371-1382页

作者：雷天婷汪在聪李妍中国地质大学珠宝学院湖北武汉430074 中国地质大学地球科学学院地质过程与矿产资源国家重点实验室湖北武汉430074

绿松石(CuAl_(6)(PO_(4))_(4)(OH)_(8)·4(H_(2)O))是重要的表生宝石矿物,已有研究采用绿松石主量元素Cu的同位素进行产地溯源,但是溯源机理不明确.此外,绿松石生长过程复杂,该过程是否造成Cu同位素组成的显著变化还不甚清楚,这限制了... 详细信息

绿松石(CuAl_(6)(PO_(4))_(4)(OH)_(8)·4(H_(2)O))是重要的表生宝石矿物,已有研究采用绿松石主量元素Cu的同位素进行产地溯源,但是溯源机理不明确.此外,绿松石生长过程复杂,该过程是否造成Cu同位素组成的显著变化还不甚清楚,这限制了其产地溯源的应用.湖北省竹山县是全球最大的宝石级绿松石产出地,采用MC-ICP-MS对竹山县条带状绿松石的生长条带进行高精度Cu同位素测试.结果表明:绿松石δ^(65)Cu值较高,然而不同条带没有明显变化(δ^(65)Cu=10.99‰~11.54‰).绿松石含矿热液沉淀过程分馏有限(<1‰),这指示绿松石Cu同位素显著变化主要发生在含矿热液的形成过程.原生硫化物的δ^(65)Cu=0±1‰,显著低于绿松石样品测定值,推测引起含矿热液Cu同位素显著分馏的主要原因是原生硫化物发生氧化作用.全球典型绿松石矿区的数据整体与该结果一致,表明绿松石Cu同位素组成主要受源区环境的控制;同一矿区中形成的绿松石,即使经历周期生长产生条带状结构,其Cu同位素组成基本一致.该研究深入探究了Cu同位素示踪绿松石矿区的机理,同时也加深了对低温过程Cu同位素分馏的认识.

关键词：绿松石生长条带 Cu同位素氧化作用产地溯源地球化学.

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地质样品卤族元素分析进展

地球科学 2021年第12期46卷 4452-4469页

作者：何焘汪在聪胡兆初中国地质大学地质过程与矿产资源国家重点实验室湖北武汉430078 中国地质大学地球科学学院湖北武汉430074

地质样品中卤素是反演与流体和挥发分相关的地质过程的重要示踪元素.由于卤素含量低和强挥发性,准确测定地质样品中卤素一直是分析地球化学的难点.近年来,针对地质样品卤素的样品前处理技术的开发开展了大量工作.高温热解法、碱熔(溶)... 详细信息

地质样品中卤素是反演与流体和挥发分相关的地质过程的重要示踪元素.由于卤素含量低和强挥发性,准确测定地质样品中卤素一直是分析地球化学的难点.近年来,针对地质样品卤素的样品前处理技术的开发开展了大量工作.高温热解法、碱熔(溶)法、酸性消解法和碱性提取法能够满足土壤、沉积物和岩石中高含量卤素的分析要求.针对低含量卤素,仅有中子活化法和稀有气体质谱法能够准确定量.随着分析地球化学的发展,地质样品卤素分析技术逐渐向更高效的消解方法、更简便的操作以及更高灵敏度和高精度的分析方向改进.总结了近年来国内外在地质样品卤素分析方面所取得的成果,对比了各类方法的优缺点,展望了地质样品卤素分析方法的发展前景.

关键词：卤族元素地质样品样品前处理分析方法地球化学

玄武质陨石NWA 8545的岩石地球化学特征以及对其母体岩浆过程的启示

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地质学报 2021年第9期95卷 2889-2900页

作者：李毅恒汪在聪何琦中国地质大学(武汉)地球科学学院湖北武汉430074

NWA 8545是一块玄武质无球粒陨石,它与碳质陨石(CC)NWA 011成对。CC被认为是来自于外太阳系的一类物质,由于同位素异常,它们区别于来自内太阳系的非碳质陨石(NC)。NWA 011及其成对陨石作为CC中稀有的玄武质无球粒陨石,其记录的岩浆过程... 详细信息

NWA 8545是一块玄武质无球粒陨石,它与碳质陨石(CC)NWA 011成对。CC被认为是来自于外太阳系的一类物质,由于同位素异常,它们区别于来自内太阳系的非碳质陨石(NC)。NWA 011及其成对陨石作为CC中稀有的玄武质无球粒陨石,其记录的岩浆过程可以被用来研究外太阳系早期行星母体的岩浆活动。本文利用扫描电镜、电子探针和激光剥蚀电感耦合等离子质谱仪(LA-ICP-MS)对NWA 8545中的辉石、斜长石和陨磷钙钠石进行岩相学以及原位主微量元素的分析,并根据矿物模式丰度计算全岩稀土元素含量。电子探针结果显示NWA 8545与HED族陨石Eucrite(钙长辉长无球粒陨石)具有相似的主量元素特征,同时其岩相学与5型Eucrite类似。激光微量数据表明辉石、斜长石和陨磷钙钠石的稀土元素配分都表现出略微的Ce异常,但其辉石的Ba、Sr等元素并未出现明显的富集现象,即该陨石受地球风化作用影响不明显。利用辉石和斜长石的稀土元素含量,计算平衡熔体的成分,显示其平衡熔体的成分都与全岩的成分比较接近,可以认为两者是在封闭的体系下接近同时结晶。结合变质过程和母体岩浆的成分,本文认为NWA 8545是由其母体岩浆在经历分离结晶过程后喷发到母体行星表面冷却形成的。

关键词：碳质陨石玄武质无球粒陨石岩浆过程热变质过程地球化学

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交代岩石圈地幔与金成矿作用

地球科学 2021年第12期46卷 4197-4229页

作者：汪在聪王焰汪翔程怀许喆中国地质大学地球科学学院地质过程与矿产资源国家重点实验室湖北武汉430074 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省矿物物理与材料研究开发重点实验室广东广州510640 中国地质调查局广州海洋地质调查局广东广州510075

交代岩石圈地幔与大型金矿床之间的成因联系受到越来越多的关注.研究成矿金属在地幔源区的富集程度和幔源岩浆中的金含量,以及金从地幔源区释放、迁移并大规模富集成矿的机制和过程可以帮助我们更好地认识交代岩石圈地幔对金富集成矿的... 详细信息

交代岩石圈地幔与大型金矿床之间的成因联系受到越来越多的关注.研究成矿金属在地幔源区的富集程度和幔源岩浆中的金含量,以及金从地幔源区释放、迁移并大规模富集成矿的机制和过程可以帮助我们更好地认识交代岩石圈地幔对金富集成矿的重要作用.金是高度亲铜元素,同时还具有流体活动性,在地幔岩浆作用、岩浆热液演化和富集成矿等诸多过程中的行为较为复杂.主要从金的地球化学行为出发,通过梳理金在各类地幔岩石和幔源岩浆中的分布,以及岩浆热液中金的主要行为及其受控因素,探讨交代岩石圈地幔对巨量金成矿的关键控制机制.主要认识包括:(1)交代岩石圈地幔可能是形成大规模热液型金矿床的重要源区,但金在源区的异常富集可能并不是成矿的必要条件;(2)地幔交代组分(特别是挥发分)有助于金从地幔源区中有效释放、并通过跨岩石圈尺度的深大断裂迁移富集;(3)富挥发分的岩浆热液中金的富集沉淀过程远比一个富金的地幔源区对大规模金成矿作用的贡献更大.因此,深刻理解岩石圈地幔长期演化过程中金在地幔交代和岩浆-热液演化过程中的行为与富集机制是解析大型金矿床成因的关键.

关键词：岩石圈地幔交代作用金成矿亲铜元素挥发分地球化学

Multiple isotope composition(S,Pb,H,O,He,and Ar)and genetic implications for gold deposits in the Jiapigou gold belt,Northeast China

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Multiple isotope composition(S,Pb,H,O,He,and Ar)and genetic ...