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地球化学学报（英文版）
中国科学院地球化学研究所
地球化学学报（英文版）

中国科学院地球化学研究所

涂光炽

季刊

2096-0956

hzl@mail.gyig.ac.cn cjgc@vip.skleg.cn

0851-5891358

550002

贵州省贵阳市观水路46号地球化学研究所

地球化学学报（英文版）/Journal Acta GeochimicaCSCD北大核心EI
查看更多>>本刊由中科院地化所和中矿物岩石地球化学学会主办，科学出版社出版，荷兰VSP出版公司向世界各国发行，中外颇具影响的地学刊物，多次获全国及中科院优秀期刊奖，并被国外多家检索系统收录。
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    The occurrence of metallic copper and redistribution of copper in the shocked Suizhou L6 chondrite

    Xiande XieXiangping GuYiping Yang
    827-837页
    查看更多>>摘要：Copper possesses very strong chacophile proper-ties,but under the conditions found in meteorites,its behav-ior is like that of siderophile elements.The Suizhou mete-orite is a highly shocked L6 chondrite.Troilite and taenite are considered the main primary carrier of copper in this meteorite,and the post-shock thermal episode is consid-ered the main reason that elemental Cu migrates from its original host phase and forms metallic grains.The Suizhou meteorite contains a few very thin shock melt veins.The occurrence and behavior of metallic copper in this meteorite were studied by optical microscopic examination,electron microprobe analyses,and high-resolution X-ray elemental intensity mapping.Our results show that metallic copper is abundant in the Suizhou chondritic rock.Metallic copper grains adjacent to small troilite grains inside FeNi metal are the most common occurrence,and those at the FeNi metal-troilite interface are the second most common case.The metallic copper grains occurring at the interface of FeNi metal/troililte and silicate are rather rare.Metallic copper grains are not observed within the Suizhou shock veins,Instead,Cu in elemental form is transferred through shock metamorphism into FeNi metal+troilite intergrowths.Four different occurrence types of Cu in the FeNi metal+troilite intergrowths have been identified:the concentrations of Cu in the FeNi+FeS intergrowths for four occurrence types are rather close,we estimate it might be lower than 1 wt％.
      原文链接:
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    Petrology,geochemistry,and crystal size distribution of the basaltic andesite-dacite association at Mt.Sumbing,Central Java,Indonesia:Insights to magma reservoir dynamics and petrogenesis

    Indranova SuhendroEndra YuliawanRevina Fitri ZenZulfa Yogi Rahmawati...
    838-855页
    查看更多>>摘要：Ten rock samples consisting of one pyroclastic density current(PDC1)deposit,seven lava flows(LF1-7),and two summit lava domes(LD1,2)were studied to under-stand the petrogenesis and magma dynamics at Mt.Sumb-ing.The stratigraphy is arranged as LF1,PDC1,LF2,LF3,LF4,LF5,LF6,LF7,LD1,and LD2;furthermore,these rocks were divided into two types.Type Ⅰ,observed in the oldest(LF1)sample,has poor MgO and high Ba/Nb,Th/Yb and Sr.The remaining samples(PDC1-LD2)represent typeⅡ,characterized by high MgO and low Ba/Nb,Th/Yb and Sr values.We suggest that type Ⅰ is derived from AOC(altered oceanic crust)-rich melts that underwent significant crustal assimilation,while type Ⅱ originates from mantle-rich melts with less significant crustal assimilation.The early stage of type Ⅱ magma(PDC1-LF3)was considered a closed sys-tem,evolving basaltic andesite into andesite(55.0-60.2 wt％SiO2)with a progressively increasing phenocryst(0.30-0.48φPC)and decreasing crystal size distribution(CSD)slope(from-3.9 to-2.9).The evidence of fluctuating silica and phenocryst contents(between 55.9-59.7 wt％and 0.25-0.41φPC,respectively),coupled with the kinked and steep(from-5.0 to-3.3)CSD curves imply the interchanging condi-tion between open(i.e.,magma mixing)and closed mag-matic systems during the middle stage(LF4-LF6).Finally,it underwent to closed system again during the final stage(LF7-LD2)because the magma reached dacitic composition(at most 68.9 wt％SiO2)with abundant phenocryst(0.38-0.45 φPC)and gentle CSD slope(from-4.1 to-1.2).
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    The lithology and composition of lunar mantle modified by ilmenite bearing cumulate:A thermodynamic model

    Wei HuangWei Du
    856-875页
    查看更多>>摘要：Due to their high density,the ilmenite-bearing cumulates(IBC)(with or without KREEP)formed during the late-stage lunar magma ocean solidification are thought to sink into the underlying lunar mantle and trigger lunar mantle overturn.Geophysical evidence implied that IBC may descend deep inside the Moon and remain as a partially molten layer at the core-mantle boundary(CMB).However,partial melting may have occurred on the mixed mantle cumulates during the sinking of IBC/KREEP and the silicate melt may be positively buoyant,thus preventing the IBC/KREEP layer from sinking to the CMB.Here,we perform thermodynamic simulation on the stability of lunar mantle cumulates at different depths mixed with different amounts of IBC/KREEP from an updated LMO model.The modeling results suggest that the sinking of IBC/KREEP will cause at least 5 wt％partial melting in the shallow(～120 km)and a much larger degree of partial melting in the deep lunar mantle(～420 km).Due to the density contrast with the sur-rounding mantle,IBC/KREEP-bearing melts could poten-tially decouple under certain conditions.The modified lunar mantle by sinking of IBC/KREEP can better explain the for-mation of different kinds of lunar basaltic magma than the primary lunar mantle formed through differentiation of lunar magma ocean.Sinking of IBC/KREEP back into the lunar mantle may introduce plagioclase,clinopyroxene,garnet,and incompatible radioactive elements into the deep lunar mantle,which will further affect the thermal and chemical evolution of the lunar interior.
      原文链接:
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    Features of rare earth elements geochemistry in coals of Central Kazakhstan

    Aiman Nygmetovna KopobayevaAltynay AmangeldikyzyGulim Galymzhanovna BlyalovaNazym Srajadinkyzy Askarova...
    876-888页
    查看更多>>摘要：This research presents the results of a compre-hensive study of mineralogical and geochemical features of REE distribution in coals of Central Kazakhstan deposits—Karaganda coal basin and Shubarkol deposit,which have large hard coal reserves and are industrially important for the coal industry of Kazakhstan;the research is based on 205 samples of clayey interlayers and coal seams.It shows basic patterns of distribution and features of concentration for impurity elements,gives an estimate of the impurity elements concentration,including REE,defines conditions and factors of their accumulation,and studies features of their forms in coal and coal-bearing rocks,which allows estimating the mechanisms of their migration and conditions of accumulation.According to the results of geochemical indicators,the article establishes the factors of REE dislo-cation,reveals the composition of margin rocks that have influenced REE concentration in coal seams,and the pre-sented latest data on mineralogy allowed to establish the ways of their transportation to the paleobasin during the syn-and epigenetic periods of formation of the coal deposits of Central Kazakhstan being researched.It was found that the coals are insignificantly enriched with heavy lanthanides from Ho to Lu.The distribution curves of UCC normalized REE values in the coals are similar and coincide,but they are less than the average value for world coal,and amount to only one-third of the UCC.It was found that the high-est concentrations of all REE are characteristic of clayey interlayers and oxidized coals.The La/Yb ratio in this case increases upwards along the section,indicating mainly clas-togenic mechanism of REE delivery to the coals.In coal and clay samples,the predominant mineral form of REE is light lanthanide phosphates.Identified particles of REE from minerals and their composition peculiarities suppose auti-gene nature of their formation.The formation of the bulk of autigene minerals occurred during the maturation of brown coals and their transformation into hard ones.
      原文链接:
    • 万方数据
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    The abundance,distribution,and enrichment mechanism of harmful trace elements in coals from Guizhou,Southwestern China

    Hui HouWei ChengRuidong YangYan Zhang...
    889-903页
    查看更多>>摘要：Coal seams can enrich a variety of harmful trace elements under specific geological conditions.The spatial distribution of harmful trace elements in coal is extremely uneven,and the distribution characteristics of each element content are different.The harmful elements released in the process of coal mining and utilization will cause serious harm to the environment and the human body.It is of great resource significance to study the geochemistry of coal that affects the enrichment and distribution characteristics of harmful trace elements.Based on the domestic and foreign literature on coal geochemistry in Guizhou published by previous investigators,this study counted 1097 sample data from 23 major coal-producing counties in Guizhou Province,systematically summarized the relevant research results of harmful trace elements in the coal of Guizhou,and revealed the overall distribution and enrichment characteristics of harmful trace elements in the coal of Guizhou.The results show that the average contents of Cd,Pb,Se,Cu,Mo,U,V,As,Hg,and Cr in coal of Guizhou are higher than those in Chinese coal and world coal.A variety of harmful trace elements in the coal of Guizhou have high background values,especially in Liupanshui,Xingyi and Qianbei coalfield.The enrichment of various harmful trace elements in the Late Permian coal in Guizhou is mainly related to the combined action of various geological and geochemical factors.The supply of terrigenous debris and sedimentary environment may be the basic background of the enrichment of harmful elements in western Guizhou,while low-temperature hydrothermal activity and volcanic ash deposition may be the main reasons for the enrichment of harmful elements in southwestern Guizhou.
      原文链接:
    • 万方数据
    • 维普

    Mineralogy and whole-rock geochemistry of the Oligocene Barail Group of rocks of Belt of Schuppen,Northeast India:Implications for tectono-provenance and paleo-weathering

    Manash Pratim GogoiYunpeng DongPradip BorgohainDevojit Bezbaruah...
    904-932页
    查看更多>>摘要：The petrographic and geochemical attributes of the Oligocene Barail Group of rocks are used to decipher the likely source area(s)or tectonic domains,as this sequence of rocks was deposited in a foreland basin governed by oro-genic domain,namely the North-east Arunachal Himalayas.The river system that gave rise to the Brahmaputra River(Yarlung-Tsangpo),which flowed through several tectonic domains of the Himalayan ranges,primarily from Bomi-Chayu,Gangadese Granitoid,Higher Himalayan Leucogran-ites,and Namche Barwa into the proto Bengal Basin now a part of Assam Arakan Basin and Naga Schuppen Belt,was the main source of the sandstone formation of the Barail Group.The purpose of sandstone petrography,which com-bines modal analysis with XRF(Major Oxides)and HR-ICP-MS(Trace & Rare Earth Elements)research,is to identify the type of source rock(s),their weathering pattern,and its paleo-environmental circumstances.These sandstones were formed from recycled orogen and include lithic and sublithic arenite variants with advanced texture and chemical matu-rity.The sediments were felsic(Th/Co:1.38,Cr/Th:9.78,La/Lu:11.58,Th/Sc:0.99,Eu/Eu*:0.66,La/Sc:3.05,La/Co:4.18),with contributions from intermediate source rocks and low-rank metamorphics deposited in an active conti-nental margin to a continental island arc setting.Climatic conditions impacted the sediments of Barails,characterised by being warm and semi-humid to humid which resulted in moderate to a high degree of chemical weathering,as shown by weathering indices like CIA(79.14),PIA(85.47),CIW(86.9),WIP(32.50),ICV(0.71),and Th/U(6.03),which were further additionally supported by C-Value(1.01),PF(1.20),Sr/Cu(2.04),and Rb/Sr(0.97).
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    The source of lithium in Lakkor Co Salt Lake on Qinghai-Tibet Plateau,China:evidence from hydrochemical characteristics and boron isotope

    Zheng Yan LiBin Kai LiMao-Yong HeXue Qin Wen...
    933-946页
    查看更多>>摘要：The availability of lithium resources is of great significance for the development of modern technologies,as well as for civil and military industries.The Qinghai-Tibet Plateau is a region known for its abundance of lithium-rich salt lakes.However,the specific origin of lithium in these lakes is still unknown,which hinders the advancement of the lithium resource business in this region.To research this issue,this study involved the collection of 20 samples from Lakkor Co Salt Lake on Qinghai-Tibet Plateau,encompass-ing samples of surface brine,cold springs,fresh lakes,and recharge rivers.The composition of anions and cations in these samples was determined.Furthermore,the analysis extensively utilized the Piper three-line diagram,Gibbs model,and ion proportion coefficient.The findings of this study indicate that as the moves from the recharge water system to salt lake,there is a transition in water type from strong carbonate to moderate carbonate and weak carbonate,as well as Na sulfate.This research based on a similar source of both lithium and boron,utilized ion correlation analysis and boron isotope study in the Lakkor Co area,and analyzed the source and transporting process of lithium.The main origin of lithium in Lakkor Co is the dissolution of lithium-rich rocks,recharge water systems,and deep hydrothermal fluids.These findings are highly significant in enhancing the foundational data of lithium-rich brine resources in the Qinghai-Tibet Plateau and are beneficial for assessing the future development of such deposits.
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    Processes involving soil CO2 dynamic in a sector of Chaco-Pampean plain,Argentina:An isotope geochemical approach

    Sanci RominaPanarello Héctor
    947-958页
    查看更多>>摘要：The magnitude and spatial variability of CO2 surface emissions and processes involving CO2 released to the atmosphere from the soils are relevant issues in the con-text of climate change.This work evaluated CO2 fluxes and 13C/12C ratio of vegetation,organic matter,and soil gases from no disturbed soils of Chaco Pampean Plain(Argentina)with different soil properties and environmental conditions(PL and PA units).Soil organic decomposition from indi-vidual layers was accompanied by δ13C of total organic car-bon(δ13C-TOC)values more enriched to depth.δ13C-TOC values in the upper soil profile～ca.0-15 cm were like the plant community of this area(～-33 to-29 ‰)while δ13C-TOC varied stronger bellow horizon A,till～-24‰.Bothδ13C-TOC and soil δ13C-CO2 were similar(～-24 to 26 ‰)at deeper horizons(～50-60 cm).Toward the superficial layers,δ13C-TOC and δ13C-CO2 showed more differences(till～4 ‰),due influence of the diffusion process.Hori-zon A layer(～0-20 cm)from both PL and PA units con-tained the most enriched δ13C-CO2 values(～-15-17 ‰)because atmospheric CO2 permeated the soil air.A simple two-component mixing model between sources(atmos-pheric δ13C-CO2 and soil CO2)confirmed that process.Isotopically,CO2 fluxes reflected the biodegradation of C3 plants(source),diffusive transport,and CO2 exchange(atmosphere/soil).Soil moisture content appeared as a deter-mining factor in the diffusion process and the magnitude of CO2 surface emissions(12-60 g.m-2.d-1).That condition was confirmed by CO2 diffusion coefficients estimated by air-filled porosity parameters and soil radon gradient model.
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    Theoretical study of kinetic isotope effects for vacancy diffusion of impurity in solids

    Yuxi JingXuefang LiYun Liu
    959-970页
    查看更多>>摘要：Theoretical studies of the diffusional isotope effect in solids are still stuck in the 1960s and 1970s.With the development of high spatial resolution mass spectrom-eters,isotopic data of mineral grains are rapidly accumu-lated.To dig up information from these data,molecular-level theoretical models are urgently needed.Based on the microscopic definition of the diffusion coefficient(D),a new theoretical framework for calculating the diffusional isotope effect(DIE(v))(in terms of D*/D)for vacancy-mediated impurity diffusion in solids is provided based on statistical mechanics formalism.The newly derived equation shows that the DIE(v)can be easily calculated as long as the vibra-tion frequencies of isotope-substituted solids are obtained.The calculated DIE(v)values of 199Au/195Au and 60Co/57Co during diffusion in Cu and Au metals are all within 1％of errors compared to the experimental data,which shows that this theoretical model is reasonable and precise.
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    Machine learning prediction of methane,ethane,and propane solubility in pure water and electrolyte solutions:Implications for stray gas migration modeling

    Ghazal KootiReza TaherdangkooChaofan ChenNikita Sergeev...
    971-984页
    查看更多>>摘要：Hydraulic fracturing is an effective technology for hydrocarbon extraction from unconventional shale and tight gas reservoirs.A potential risk of hydraulic fractur-ing is the upward migration of stray gas from the deep sub-surface to shallow aquifers.The stray gas can dissolve in groundwater leading to chemical and biological reactions,which could negatively affect groundwater quality and con-tribute to atmospheric emissions.The knowledge of light hydrocarbon solubility in the aqueous environment is essen-tial for the numerical modelling of flow and transport in the subsurface.Herein,we compiled a database containing 2129 experimental data of methane,ethane,and propane solu-bility in pure water and various electrolyte solutions over wide ranges of operating temperature and pressure.Two machine learning algorithms,namely regression tree(RT)and boosted regression tree(BRT)tuned with a Bayesian optimization algorithm(BO)were employed to determine the solubility of gases.The predictions were compared with the experimental data as well as four well-established ther-modynamic models.Our analysis shows that the BRT-BO is sufficiently accurate,and the predicted values agree well with those obtained from the thermodynamic models.The coefficient of determination(R2)between experimental and predicted values is 0.99 and the mean squared error(MSE)is 9.97 × 10-8.The leverage statistical approach further con-firmed the validity of the model developed.
      原文链接:
    • 万方数据
    • 维普