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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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    Geochemical modeling to aid experimental design for multiple isotope tracer studies of coupled dissolution and precipitation reaction kinetics

    Mingkun ChenPeng LuYongchen SongChen Zhu...
    1-15页
    查看更多>>摘要：It is a challenge to make thorough but efficient experimental designs for the coupled mineral dissolution and precipitation studies in a multi-mineral system,because it is difficult to speculate the best experimental duration,optimal sampling schedule,effects of different experimental condi-tions,and how to maximize the experimental outputs prior to the actual experiments.Geochemical modeling is an efficient and effective tool to assist the experimental design by vir-tually running all scenarios of interest for the studied system and predicting the experimental outcomes.Here we demonstrated an example of geochemical modeling assisted experimental design of coupled labradorite dissolution and calcite and clayey mineral precipitation using multiple iso-tope tracers.In this study,labradorite(plagioclase)was chosen as the reactant because it is both a major component and one of the most reactive minerals in basalt.Following our isotope doping studies of single minerals in the last ten years,initial solutions in the simulations were doped with multiple isotopes(e.g.,Ca and Si).Geochemical modeling results show that the use of isotope tracers gives us orders of magnitude more sensitivity than the conventional method based on concentrations and allows us to decouple dissolu-tion and precipitation reactions at near-equilibrium condi-tion.The simulations suggest that the precise unidirectional dissolution rates can inform us which rate laws plagioclase dissolution has followed.Calcite precipitation occurred at near-equilibrium and the multiple isotope tracer experiments would provide near-equilibrium precipitation rates,which was a challenge for the conventional concentration-based experiments.In addition,whether the precipitation of clayey phases is the rate-limiting step in some multi-mineral sys-tems will be revealed.Overall,the modeling results of multi-mineral reaction kinetics will improve the understanding of the coupled dissolution-precipitation in the multi-mineral systems and the quality of geochemical modeling prediction of CO2 removal and storage efficacy in the basalt systems.
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    Solute transport and geochemical modeling of the coastal quaternary aquifer,Delta Dahab Basin,South Sinai,Egypt

    Amira SamyMustafa EissaSeham ShahenMoustafa M.Said...
    16-39页
    查看更多>>摘要：The wadi dahab delta is in a dry,arid coastal zone within Egypt's south Sinai Peninsula's eastern por-tion.The primary water source is the Quaternary coastal alluvial aquifer.The groundwater salinity varies from 890 to 8213 mg/L,with a mean value of 3417 mg/L.The dis-solved major ions have been used to calculate the seawater mixing index(SWMI)using a linear equation that dis-criminates the groundwater mostly affected by water-rock interaction(SWMI 1＞)and other samples mixed with Seawater(SWMI＜1).The isotopic composition of groundwater for specifically chosen groundwater samples ranges from-0.645‰ to+5.212‰ for δ18O and from-9.582‰ to+22.778‰ for δ2H,where the seawater represented by a Red Sea water sample(δ18O+1.64‰-δ2H+9.80‰)and reject brine water are considerably enriched the isotopic groundwater values.The geochemical NETPATH model constrained by the dissolved significant ions,isotopes,and the rock aquifer forming minerals as phases indicate the mixing percent with the seawater ran-ges from 9％to 97％of seawater from 91％to 3％of original recharge water.According to the SEAWAT 3-D flow models,seawater has penetrated the Northeastern Dahab delta aquifer,with the intrusion zone extending 1500 m inland.The salt dissolution,upwelling of saline water,recharge from the upstream mountain block,and seawater encroachment are the primary aspects contribut-ing to the deterioration of groundwater quality.These findings may have significance for effective groundwater withdrawal management in arid locations worldwide with similar hydrogeological systems.
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    Geochemistry,zircon U-Pb geochronology,and Hf isotopes of S-type granite in the Baoshan block,constraints on the age and evolution of the Proto-Tethys

    Jianjun ZhangChuanlong MouChendong LiuYong Zhang...
    40-58页
    查看更多>>摘要：Geochemistry,zircon U-Pb geochronology,and Hf isotope data for the Early Paleozoic granites in the Baoshan Block reveal the Early Paleozoic tectonic evolu-tion of the Proto-Tethys.The samples are high-K,calc-alkaline,strongly peraluminous rocks with A/CNK values of 1.37-1.46,are enriched in SiO2,K2O,and Rb,and are depleted in Nb,P,Ti,Eu,and heavy rare earth elements,which indicates the crystallization fractionation of the granitic magma.Zircon U-Pb dating indicates that they formed in ca.480 Ma.The Nansa granites have εHf(t)val-ues ranging from-16.04 to 4.36 with corresponding TCDM ages of 2.10-0.81 Ga,which suggests the magmas derived from the partial melting of ancient metasedimen-tary with minor involvement of mantle-derived compo-nents.A synthesis of data for the Early Paleozoic igneous rocks in the Baoshan block and adjacent(Tengchong,Qiangtang,Sibumasu,Himalaya,etc.)blocks indicates that these blocks were all aligned along the proto-Tethyan margin of East Gondwana in the Early Paleozoic.The Early Paleozoic S-type granites from Nansa were generated in a high-temperature and low-pressure(HTLP)exten-sional tectonic setting,which resulted from Andean-type orogeny instead of the final assembly of Gondwana or crustal extension in a non-arc environment.In certain places,an expanding environment may exist in opposition to the tectonic backdrop of the lithosphere's thickening and shortening,leading the crust to melt and decompress,mantle-derived materials to mix,and a small quantity of peraluminous granite to emerge.
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    Distribution,health and ecological risk assessments of trace elements in Nigerian oil sands

    Odunayo T.OreFestus M.Adebiyi
    59-71页
    查看更多>>摘要：The Nigerian oil sands represent the largest oil sand deposit in Africa,yet there is little published infor-mation on the distribution and potential health and eco-logical risks of trace elements in the oil resource.In the present study,we investigated the distribution pattern of 18 trace elements(including biophile and chalcophile ele-ments)as well as the estimated risks associated with exposure to these elements.The results of the study indi-cated that Fe was the most abundant element,with a mean concentration of 22,131 mg/kg while Br had the lowest mean concentration of 48 mg/kg.The high occurrence of Fe and Ti suggested a possible occurrence of ilmenite(FeTiO3)in the oil sands.Source apportionment using positive matrix factorization showed that the possible sources of detected elements in the oil sands were geo-genic,metal production,and crustal.The contamination factor,geo-accumulation index,modified degree of con-tamination,pollution load index,and Nemerow pollution index indicated that the oil sands are heavily polluted by the elements.Health risk assessment showed that children were relatively more susceptible to the potentially toxic elements in the oil sands principally via ingestion exposure route(HQ＞1E-04).Cancer risks from inhalation are unlikely due to CR＜1E-06 but ingestion and dermal contact pose severe risks(CR＞1E-04).The high con-centrations of the elements pose serious threats due to the potential for atmospheric transport,bioaccessibility,and bioavailability.
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    Petrogenesis and tectonic implications of the Silurian adakitic granitoids in the eastern segment of the Qilian Orogenic Belt,Northwest China

    Jiao-Long ZhaoXiao-Jun HuangPei-Qing HuZhen-Xi Yang...
    72-86页
    查看更多>>摘要：Geodynamic mechanism responsible for the generation of Silurian granitoids and the tectonic evolution of the Qilian orogenic belt remains controversial.In this study,we report the results of zircon U-Pb age,and sys-tematic whole-rock geochemical data for the Haoquangou and Liujiaxia granitoids within the North Qilian orogenic belt and the Qilian Block,respectively,to constrain their petrogenesis,and the Silurian tectonic evolution of the Qilian orogenic belt.Zircon U-Pb ages indicate that the Haoquangou and Liujiaxia intrusions were emplaced at 423±3 Ma and 432±4 Ma,respectively.The Hao-quangou granodiorites are calc-alkaline,while the Liuji-axia granites belong to the high-K calc-alkaline series.Both are peraluminous in composition and have relatively depleted Nd isotopic[εNd(t)=(-3.9-+0.6)]charac-teristics compared with regional basement rocks,implying their derivation from a juvenile lower crust.They show adakitic geochemical characteristics and were generated by partial melting of thickened lower continental crust.Post-collisional extensional regime related to lithospheric delamination was the most likely geodynamic mechanism for the generation of the Haoquangou granodiorite,while the Liujiaxia granites were generated in a compressive setting during continental collision between the Qaidam and Qilian blocks.
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    Facies development and sedimentology of the Middle Miocene carbonates of the Raghama Formation,northeastern Saudi Arabia

    Mansour H.Al-HashimAbdelbaset S.El-SorogyMeshal Wadani
    87-96页
    查看更多>>摘要：Ragahama Formation comprises a siliciclastic continental deposits followed by marine carbonates,rep-resenting prograding alluvial fans from adjacent high hin-terlands seaward into lagoons and fringing reef environments.The present work aimed to document the facies development and sedimentology of the Raghama carbonates exposed along the eastern coastal plain of the Red Sea,northwestern Saudi Arabia.Four stratigraphic sections were measured and sampled(D1-D4)and thin sections and major and trace element analyses were pre-pared and applied for petrographic and geochemical approaches.The carbonates were subdivided into three successive fore-reef,reef-core,and back-reef depositional facies.Sandy stromatolitic boundstone,microbial lami-nites,dolomitic ooidal grainstone,bioclastic coralline algal wackestone,sandy bioclastic wackestone,and coral boundstones were the reported microfacies types.Petro-graphic analysis reveals that the studied carbonates were affected by dissolution,dolomitization,and aggrading recrystallization,which affects both the original micrite matrix and grains or acts as fracture and veinlet filling leading to widespread vuggy and moldic porosity.No evidence of physical compaction,suggesting rapid lithifi-cation and recrystallization during early diagenesis and prior to substantial burial and intensive flushing by mete-oric waters.Most of the original microstructure of corals were leached and destructed.This is indicated by the higher depletion in Sr and Ca levels and increase in Mg,Na,Fe,and Mn levels,especially in section D1,in com-parison with the worldwide carbonates.
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    The co-transport of Cd(Ⅱ)and nZnO in saturated soil packed column:effects of ionic strength and pH

    Min LiaoGuo BinYixin LuoYuhao Zhang...
    97-109页
    查看更多>>摘要：The rapid development and widespread use of ZnO nanoparticles(nZnO)in various industries have raised concerns about their potential environmental impact.Therefore,understanding the fate and role of nZnO in the natural environment is crucial for mitigating their haz-ardous effects on the environment and human safety.The purpose of the present study was to provide scientific support for understanding and eliminating the joint risk of nanoparticle and heavy metal pollution in the soil envi-ronment by revealing the co-transport characteristics of Cd(Ⅱ)and ZnO nanoparticles(nZnO)in soil under dif-ferent ionic strength(IS)and pH.The impacts of different IS and pH on the co-transport of Cd(Ⅱ)and nZnO in a 20 cm long with an inner diameter of 2.5 cm acrylic col-umn packed with 10 cm high soil samples were investi-gated in the present study.In the above system,a 500 μg L-1Cd(Ⅱ)loaded nZnO suspension pulse with varying IS or pH was introduced into the soil column for leaching over 5 PVs,followed up by 5 PVs background solutions without nZnO.The IS was 1,10,or 50 mM NaCl,with pH6,or the pH was 6,7 or 8 with 1 mM NaCl.Meanwhile,Sedimentation experiments for nZnO,adsorption of Cd(Ⅱ)on soil,and nZnO,DLVO theory calculation for the same background condition were con-ducted.The presence of nZnO significantly increased the mobility of Cd(Ⅱ)as a result of its strong adsorption capacity for nZnO-associated Cd(Ⅱ).However,with the increase of IS,the co-transport of nZnO and Cd(Ⅱ)was decreased and the retention of nZnO in the soil column due to more nZnO attended to aggregate and sediment during the transport and the decrease in the adsorption capacity of nZnO for Cd(Ⅱ)by competition of Na+.When pH was 6,7,and 8,the co-transport of nZnO and Cd(Ⅱ)increased with higher pH due to the lower electrostatic attraction between nZnO and soil under higher pH.Meanwhile,the DLVO theory was fitted to describe the above co-transport process of nZnO and Cd(Ⅱ).More attention should be paid to the presence of nZnO on the migration of Cd(Ⅱ)in the natural soil to control the potential risk of nanoparticles and heavy metals to the environment.The risk of co-transport of nZnO and Cd(Ⅱ)might be controlled by adjusting IS and pH in the soil solution.
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    Geochemistry and mineral chemistry of the armoor granitoids,eastern dharwar craton:implications for the redox conditions and tectono-magmatic environment

    A.Ajay KumarCh.Ashok
    110-133页
    查看更多>>摘要：The mineralogical and geochemical character-istics of the K-rich granites from the Armoor granitic rocks in the northeastern portion of the Eastern Dharwar Craton(EDC)are presented.In order to understand its physico-chemical conditions,the petrogenesis of the granitoid was explained from biotite chemistry and geochemical sys-tematics.Studies of mineral chemistry expose that com-positionally,K-feldspar and plagioclase in Armoor granite rocks range from An0,Ab3-5.9,Or94-96,9 and An5-29,-Ab71.9-94.9,Or0-1.5,respectively.The mineral chemistry of biotite crystals exhibits composition that varies from pri-mary to re-equilibrated primary biotites.Although biotites from the Armoor granites generally exhibit an I-type trend,with calc-alkaline parental magma in a subduction setting.Biotite chemistry of granites displays magnetite(oxidized)series nature,which has oxygen fugacity(fO2)=-15.1 to-16.7(log10 bar),under high oxidizing conditions.Tem-perature and pressure estimates for the crystallization of Armoor granites based on biotite composition are T=612-716 ℃ and 1.0-0.4 kbar,respectively.Geo-chemically,these rocks are metaluminous to slightly per-aluminous and magnesian,with calc-alkaline potassium-rich granite.On the chondrite normalized REE diagram,the granites have positive europium anomalies;rich Sr/Y,(Dy/Yb)N ratios and reduced Mg#,Rb/Sr,Rb,Sr indicate that the melting of earlier rocks,crystal accumulation and residual garnet source formed at high pressures.The examined granites show that they are produced from the melting of crustal sources.Thus,the extensive analyses of the described Armoor granite suggest that they were pro-duced by crust sources and developed under oxidizing conditions in subduction setting.
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    The late Early-Paleozoic granitic magmatism in Northwestern Fujian,China:constraints on intraplate orogeny in the South China block

    WanLi GaoZongXiu Wang
    134-149页
    查看更多>>摘要：The Early Paleozoic tectono-thermal event was a significant orogenic activity during the Phanerozoic era,which had a profound impact on the early crust of the South China Block(SCB)and established the foundation for later tectonic activity.The Wuyi-Yunkai orogenic belt in Southeastern China was extensively exposed to Early Paleozoic magmatism,the genetic mechanism of which remains controversial.To shed light on this issue,detailed petrological,geochemical,and zircon U-Pb-Hf isotopic studies were carried out on two granitoids,namely the Yuntongshan pluton and the Gaoqiao pluton,identified in the central Wuyishan.Zircon U-Pb chronology of the Yuntongshan and Gaoqiao bodies yielded ages of 437±4 Ma(MSWD=2.2)and 404±2 Ma(MSWD=12),respectively,indicating that they were emplaced during the Early Silurian and Early Devonian periods.These granitoids are primarily composed of biotite-granite and biotite-monzonitic-granites,with high concentrations of SiO2(73.59-75.91 wt％),K2O+Na2O(8.31-8.73 wt％),and low contents of MgO,CaO,Cr,Ni.They are classified as high-K calc-alkaline and weakly metalumi-nous-strongly peraluminous S-type granites.These grani-toids are enriched in light rare earth elements(LREEs)and large ion lithophile elements(LILEs)and depleted in heavy rare earth elements(HREEs)and high field strength ele-ments(HFSEs)with arc affinity.The εHf(t)values of-3.3 to-15.4 with two-stage Hf model ages ranging from 2829 to 1644 Ma,combined with the presence of Neoproterozoic inherited zircons,suggest that the primary magma of these granitoids was derived from the partial melting of Neoproterozoic crust with a Paleoproterozoic crustal model age.These findings,combined with the spatio-temporal distribution of regional magmatism,reveal that the late Early-Paleozoic granitoids formed in the intraplate orogenic background originating from the sub-duction of the proto-Tethys Ocean and proto-Pacific Ocean around the margin of the east Gondwana supercontinent.
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    Mafic and felsic magmatism in the Wadi Kalalat area,South Eastern Desert,Egypt:mineralogy,geochemistry and geodynamic evolution during the Neoproterozoic in the Nubian Shield

    Adel A.SurourAhmed A.MadaniMohamed A.El-Sobky
    150-173页
    查看更多>>摘要：In the south Eastern Desert of Egypt,two con-trasting types of magmatism(mafic and felsic)are recorded in the Wadi Kalalat area,and form the Gabal El Mota-ghiarat and Gabal Batuga intrusions,respectively.The two intrusions post-dates ophiolitic and arc associations repre-sented by serpentinite and metagabbro-diorite,respec-tively.The mafic intrusion has a basal ultramafic member represented by fresh peridotite,which is followed upward by olivine gabbro and anorthositic or leucogabbro.This mafic intrusion pertains to the Alaskan-type mafic-ultra-mafic intrusions in the Arabian-Nubian Shield(ANS)being of tholeiitic nature and emplaced in a typical arc setting.On the other hand,the Gabal Batuga intrusion comprises three varieties of fresh A-type granites of high K-calc alkaline nature,which is peraluminous and garnet-bearing in parts.A narrow thermal aureole in the olivine gabbro of the mafic intrusion was developed due to the intrusion of the Batuga granites.This results in the devel-opment of a hornfelsic melagabbro variety in which the composition changed from tholeiitic to a calc-alkaline composition due to the addition of SiO2,A12O3,alkalis,lithosphile elements(LILEs)such as Rb(70 ppm)and Y(28 ppm)from the felsic intrusion.Outside the thermal aureole,Rb amounts 2-8 ppm and Y lies in the range＜2-6 ppm.It is believed that the Gabal Batuga felsic intrusion started to emplace during the waning stage of an arc sys-tem,with transition from the pre-collisional(i.e.,arc set-ting)to post-collisional and within plate settings.Magma from which the Gabal Batuga granites were fractionated is high-K calc-alkaline giving rise to a typical post-collisional A-type granite(A2-subtype)indicating an origin from an underplating crustal source.Accordingly,it is stressed here that the younger granites in the ANS are not exclusively post-collisional and within-plate but most likely they star-ted to develop before closure of the arc system.The pos-sible source(s)of mafic magmas that resulted in the formation of the two intrusions are discussed.Mineralog-ical and geochemical data of the post-intrusion dykes(mafic and felsic)suggest typical active continental rift/within-plate settings.
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