期刊,地球化学学报（英文版） 2024年卷2期_国家学术搜索

期刊信息/Journal information

地球化学学报（英文版）

中国科学院地球化学研究所

主办单位：中国科学院地球化学研究所

主　　编：涂光炽

出版周期：季刊

国际刊号：2096-0956

电子邮箱：hzl@mail.gyig.ac.cn cjgc@vip.skleg.cn

电　　话：0851-5891358

邮政编码：550002

地　　址：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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Metallogenesis of the Baidi Au-Sb deposit,southwest Guizhou Province,China:mineralogical and geochemical evidence from sulfur-bearing minerals

Jun YanYong XiaQinping TanZhuojun Xie...

199-213页

查看更多>>摘要：The Baidi Au-Sb deposit,which contains 8 t of Au and 10,979 Mt of Sb,is a typical and rare paragenetic deposit located in southwestern Guizhou Province,China.Previous studies have focused on individual ores,but have not combined them to identify their paragenetic mechanism or metallogenic regularity.Therefore,we used field investigations,microscopic observations,and in situ anal-yses to identify the spatial distribution,mineral paragene-sis,compositional evolution,and metallogenic material sources of the ore bodies.We also determined the Au and Sb paragenetic characteristics and the metallogenesis of the deposit.The main Au-bearing minerals in the deposit were early(Apy1-2)and late(Apy3)stage arsenopyrites,as well as pre-mineralization(Py1),mineralization(Py2-5),and late mineralization(Py6-7)stage pyrites.The main Sb-bearing minerals were stibnite(Snt),skinnerite,bournonite,and valentinite.The minerals formed in the order of Py1,Py2-3+Apy1,Py4-5+Apy2,Snt,and Py6-7+Apy3.The δ34S values of the arsenopyrites and pyrites ranged from-5 to 5‰,while those of stibnite were mostly less than-5‰ in the later mineralization stages.Sulfur was provided by deep magmatic hydrothermal fluids,but sedimentary sulfur was added in the later stages.Moreover,the trace elemental contents fluctuated and eventually became similar to those of the sedimentary strata.By comprehensively considering the ores along with the geo-logical characteristics of the deposit,we determined that deep magma provided the Au during ore formation.Later tectonic changes provided Sb from the sedimentary strata,which precipitated along fault expansion areas and pro-duced Au and Sb paragenesis.

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Weathering and accumulation of trace elements in the soils of the Porali Plain,Balochistan:repercussions in agriculture

Maria KaleemErum BashirShahid NaseemTahir Rafique...

214-234页

查看更多>>摘要：This study is the first attempt to assess the nature of the soil,especially on the western side of the Porali Plain in Balochistan;a new emerging agriculture hub,using weathering and pollution indices supplemented by multi-variate analysis based on geochemical data.The outcomes of this study are expected to help farmers in soil manage-ment and selecting suitable crops for the region.Twenty-five soil samples were collected,mainly from the arable land of the Porali Plain.After drying and coning-quarter-ing,soil samples were analyzed for major and trace ele-ments using the XRF technique;sieving and hydrometric methods were employed for granulometric analysis.Esti-mated data were analyzed using Excel,SPSS,and Surfer software to calculate various indices,correlation matrix,and spatial distribution.The granulometric analysis showed that 76％of the samples belonged to loam types of soil,12％to sand type,and 8％to silt type.Weathering indices:CIA,CIW,PIA,PWI,WIP,CIX,and ICV were calculated to infer the level of alteration.These indices reflect mod-erate to intense weathering;supported by K2O/AI2O3,Rb/K2O,Rb/Ti,and Rb/Sr ratios.Assessment of the geo-ac-cumulation and Nemerow Pollution indices pinpoint rela-tively high concentrations of Pb,Ni,and Cr concentration in the soils.The correlation matrix and Principal Compo-nent Analysis show that the soil in this study area is mainly derived from the weathering of igneous rocks of Bela Ophiolite(Cretaceous age)and Jurassic sedimentary rocks of Mor Range having SEDEX/MVT type mineralization.Weathering may result in the undesirable accumulation of certain trace elements which adversely affects crops.

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Origin of the Yueguang gold deposit in Xinhua,Hunan Province,South China:insights from fluid inclusion and hydrogen-oxygen stable isotope analysis

Hongxin FanQiang WangYulong YangYao Tang...

235-254页

查看更多>>摘要：The Yueguang gold deposit is located in Fengjia,Xinhua County,Hunan Province,South China.It represents a recently discovered small-scale gold deposit situated in the southwestern region of the Jiangnan Orogenic Belt,west of the Baimashan granitic batholith.In order to discern the characteristics of the ore-forming fluids,the underlying mineralization processes,and establish a foundation for the origin of the Yueguang gold deposit fluid inclusion micro-thermometry,as well as quartz hydrogen and oxygen isotope analysis,have been carried out on samples obtained from various stages of mineralization.The hydrothermal miner-alization stages within the Yueguang gold deposit can be categorized into three stages:(i)the barren,pre-ore quartz-pyrite stage(Stage Ⅰ),the quartz-pyrite-gold stage(StageⅡ),and the post-ore quartz-carbonate stage(Stage Ⅲ),with the second stage being the main mineralization stage.The fluid inclusions identified in samples from the main min-eralization stage can predominantly be described with the NaCl-H2O and CO2-NaCl-H2O systems.These inclusions display homogenization temperatures ranging from 158.8 to 334.9 ℃,and the fluid salinity ranges from 0.3％to 4.0％(wt.％NaCl equiv.).Laser Raman spectroscopy analysis of individual inclusions further reveals the presence of gas-phases such as CO2,CH4,and N2.Isotopic analysis indicates δ180 fluid values ranging from 3.95 to 6.7 ‰ and δDH2O values ranging from-71.9 to-55.7 ‰.These results indi-cate that the ore-forming fluid of the Yueguang gold deposit belongs to metamorphic hydrothermal fluids of middle-low temperature and low salinity.In the process of ore formation,gold is transported in the form of Au(HS)2-complexes,with gold deposition being driven by fluid immiscibility.Therefore,the Yueguang gold deposit is categorized as an orogenic gold deposit dominated by metamorphic hydrother-mal fluid.It may become a new target for gold exploration in the Baimashan region,central Hunan Province.

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Geochemical fingerprints and hydrocarbon potential of Paleocene mudrocks in the Tano Basin,Ghana:insights from biomarkers and stable carbon isotopes

Kojo AmoakoNancy Pearl Osei-BoakyeNingning ZhongN'Guessan Francois De Sales Konan...

255-279页

查看更多>>摘要：The Paleocene mudrocks in Ghana's Tano Basin have received limited attention despite ongoing efforts to explore hydrocarbon resources.A thorough geochemical analysis is imperative to assess these mudrocks'petroleum generation potential and formulate effective exploration strategies.In this study,a comprehensive geochemical analysis was carried out on ten Paleocene rock cuttings extracted from TP-1,a discovery well within the Tano Basin.Various analytical techniques,including total organic carbon(TOC)analysis,Rock-Eval pyrolysis,gas chromatography-mass spectrometry,and isotope ratio-mass spectrometry,were employed to elucidate their hydrocar-bon potential and organic facies.The findings in this study were subsequently compared to existing geochemical data on Paleocene source rocks in the South Atlantic marginal basins.The results indicated that the Paleocene samples have TOC content ranging from 0.68 to 2.93 wt％.The prevalent kerogen types identified in these samples were Type Ⅱ and Type Ⅲ.Molecular and isotope data suggest that the organic matter found in the Paleocene mudrocks can be traced back to land plants and lower aquatic organisms.These mudrocks were deposited in a transi-tional environment with fluctuating water salinity,charac-terized by sub-oxic redox conditions.Maturity indices,both bulk and molecular,indicated a spectrum of maturity levels within the Paleocene mudrocks,spanning from immature to marginally mature,with increasing maturity observed with greater depth.In comparison,the organic composition and depositional environments of Paleocene source rocks in the Tano Basin closely resemble those found in the Niger Delta Basin,Douala,and Kribi-Campo Basins,the Kwanza Formation in Angola,and certain Brazilian marginal basins.However,it is worth noting that Paleocene source rocks in some of the basins,such as the Niger Delta and Brazilian marginal basins,exhibit rela-tively higher thermal maturity levels compared to those observed in the current Paleocene samples from the Tano Basin.In conclusion,the comprehensive geochemical analysis of Paleocene mudrocks within Ghana's Tano Basin has unveiled their marginal hydrocarbon generation potential.The shared geochemical characteristics between the Paleocene mudrocks in the Tano Basin and those in the nearby South Atlantic marginal basins offer valuable insights into source rock quality,which is crucial for shaping future strategies in petroleum exploration in this region.

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Petrogenesis,oxidation state and volatile content of Dongga tonalite in the Gangdese belt,Xizang:Implication for porphyry Cu mineralization

Liqiang ZhangXilian ChenShaohao ZouDeru Xu...

280-295页

查看更多>>摘要：The Gangdese belt in Xizang has experienced both Jurassic subduction and Cenozoic continental colli-sion processes,making it a globally renowned region for magmatic rocks and porphyry copper deposits.Numerous Jurassic intrusions have been identified in the belt.Apart from the quartz diorite porphyry in the large Xietongmen deposit,the Cu mineralization potential of other Jurassic intrusions in this belt remains unclear.This study presents zircon U-Pb dating and trace elements,apatite major and trace elements as well as published whole-rock geochemi-cal and isotopic data of the Dongga tonalite in the central part of the Gangdese belt,aiming to reveal the petrogen-esis,oxidation state,volatile content,and Cu mineraliza-tion potential of this intrusion.The Dongga tonalite has a zircon U-Pb age of 179.4±0.9 Ma.It exhibits high whole-rock V/Sc values(8.76-14.6),relatively low apatite CeN/CeN*ratios(1.04-1.28),elevated zircon(Eu/Eu*)N values(an average of 0.44),high Ce4+/Ce3+values(205-1896),and high ΔFMQ values(1.3-3.7),collectively suggesting a high magmatic oxygen fugacity.The Dongga tonalite fea-tures amphibole phenocrysts,relatively high whole-rock Sr/Y ratios(20.3-58.9),and lower zircon Ti temperatures(502-740 ℃),reflecting a high magmatic water content.Estimation of magmatic sulfur content(0.002-0.024 wt％)based on apatite SO3 contents indicates an enriched magma sulfur content.Combined with previous studies and the col-lected Sr-Nd-Hf isotopes,the Dongga tonalite is derived from juvenile lower crust related with subduction of the Neo-Tethys oceanic slab.When compared with Xietongmen ore-bearing porphyries,the Dongga tonalite exhibits remarkable similarities with the Xietongmen ore-bearing porphyries in terms of magma source,tectonic background,magmatic redox state,and volatile components,which indicates that the Dongga tonalite has a high porphyry Cu mineralization potential,and therefore,provides important guidance for the future mineralization exploration.

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Early Paleozoic basement diorite of arc-magmatism from Kutch basin,Western India

Piyush GuptaSandeep SinghShakti Singh RathoreArgha Narayan Sarkar...

296-307页

查看更多>>摘要：In this study,we report for the first time an Early Palaeozoic basement diorite from the drilled well Nirona-A in the Banni Half-Graben of the Kutch basin,western India.The 40Ar-39Ar dates provided a plateau age of 441.84±2.66 Ma and another pseudo plateau of 441.28±5.82 to 388.08±16.65 Ma for the basement diorite.These ages constrain the basement formation age to the Late Ordovician-Early Silurian period.The obtained basement ages are correlatable with the later part of Cambro-Ordovician alkaline magmatism that has been reported from the Huqf area in Central Oman,whereas their lithological and petrographic correlativity with base-ment diorites occurring in the Dinsi Body of Nagar Parkar igneous complex in Pakistan can also be envisaged.The geochemical studies characterized the diorite with enrich-ment of LILE(Rb,Ba,and K)and LREE(La,Ce,Nd),strong depletion of HFSE(Nb,Sr,P,and Ti),along with weakly negative Eu anomalies.The geochemical signatures indicate their petrogenetic affiliation with mantle-derived magmas,as well as their tectonic setting to be arc-related,having post-collisional continental-arc type affinity.The～440 Ma basement of Kutch,therefore,appears to rep-resent the later thermal event associated with the reworked Neoproterozoic subduction-related suite from Greater India's northwest edge,which has implications for Gond-wana assembly in the northwest Indian subcontinent.

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Source of metals related to gold occurrences in Cameroon,Central African Belt

Kevin Igor Azeuda NdonfackJinlin ZhangYuling XieN.Samiratou Yaya...

308-324页

查看更多>>摘要：Suites of granitic and metamorphic rocks form a perfect geological environment in which to investigate the source of metals related to gold deposits.In the East Province of Cameroon,the source of metals-related gold(grade～4.6 g/t)that occurs within metamorphic and granitic rocks remains ambiguous.The host rocks were subjected to XRF and ICP-MS whole-rock geochemistry and BSE/EDS mineral analyses to investigate the source(s)of metals related to gold in the Province.Petrographically,chalcopy-rite-pyrite and magnetite-ilmenite are the main sulfides and oxides of granites,respectively.The low-grade metamorphic rocks are sulfide-rich consisting of arsenopyrite,chalcopy-rite,pyrite,and sphalerite,and oxides include magnetite,ilmenite,hematite,and rutile.Cu,Ni,Co,Sb,Sc,and Zn concentrations depleted in high-grade metamorphic rocks and granites compared to low-grade metamorphic rocks.As well,Bi,Cd,Co,Cu,Ni,Sb,V,W,and Zn concentrations decrease with increasing temperatures from low-grade rocks to high-grade rocks and granites.The suite of depleted ele-ments in high-grade rocks and granites is almost identical to those enriched in gold occurrences.We conclude that metals(Bi,Cd,Co,Cu,Ni,Sb,and Zn)related to gold mineraliza-tion in the East Province of Cameroon likely originated from metal-rich low-grade metamorphic rocks during prograde metamorphic processes prior to partial melting.

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Assessment of groundwater quantity,quality,and associated health risk of the Tano river basin,Ghana

Adwoba Kua-Manza EdjahBruce Banoeng-YakuboAnthony EwusiEnoch Sakyi-Yeboah...

325-353页

查看更多>>摘要：In the Tano River Basin,groundwater serves as a crucial resource;however,its quantity and quality with regard to trace elements and microbiological loadings remain poorly understood due to the lack of groundwater logs and limited water research.This study presents a comprehensive analysis of the Tano River Basin,focusing on three key objectives.First,it investigated the aquifer hydraulic parameters and the results showed significant spatial variations in borehole depths,yields,transmissivity,hydraulic conductivity,and specific capacity.Deeper boreholes were concentrated in the northeastern and southeastern zones,while geological formations,particu-larly the Apollonian Formation,exhibit a strong influence on borehole yields.The study identified areas with high transmissivity and hydraulic conductivity in the southern and eastern regions,suggesting good groundwater avail-ability and suitability for sustainable water supply.Sec-ondly,the research investigated the groundwater quality and observed that the majority of borehole samples fall within WHO(Guidelines for Drinking-water Quality,Environmental Health Criteria,Geneva,2011,2017.http://www.who.int)limit.However,some samples have pH levels below the standards,although the groundwater generally qualifies as freshwater.The study further explores hydrochemical facies and health risk assessment,highlighting the dominance of Ca-HCO3 water type.Trace element analysis reveals minimal health risks from most elements,with chromium(Cr)as the primary contributor to chronic health risk.Overall,this study has provided a key insights into the Tano River Basin's hydrogeology and associated health risks.The outcome of this research has contributed to the broader understanding of hydrogeologi-cal dynamics and the importance of managing groundwater resources sustainably in complex geological environments.

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Experimental study on reactions between alkaline basaltic melt and orthopyroxenes:constraints on the evolution of lithospheric mantle in the North China Craton

Hanqi HeMingliang WangHongfeng Tang

354-365页

查看更多>>摘要：The experimental results of the reactions between an alkaline basaltic melt and mantle orthopyrox-enes under high-temperature and high-pressure conditions of 1300-1400 ℃ and 2.0-3.0 GPa using a six-anvil appa-ratus are reported in this paper.The reactions are proposed to simulate the interactions between melts from the asthe-nospheric mantle and the lithospheric mantle.The starting melt in the experiments was made from the alkaline basalt occurring in Fuxin,Liaoning Province,and the orthopyrox-enes were separated from the mantle xenoliths in Damaping,Hebei Province.The results show that clinopyroxenes were formed in all the reactions between the alkaline basaltic melt and orthopyroxenes under the studied P-T conditions.The formation of clinopyroxene in the reaction zone is mainly controlled by dissolution-crystallization,and the chemical compositions of the reacted melt are primarily influenced by the diffusion effect.Temperature is the most important parameter controlling the reactions between the melt and orthopyroxenes,which has a direct impact on the melting of orthopyroxenes and the diffusion of chemical compo-nents in the melt.Temperature also directly controls the chemical compositions of the newly formed clinopyroxenes in the reaction zone and the reacted melt.The formation of clinopyroxenes from the reactions between the alkaline basaltic melt and orthopyroxenes can result in an increase of CaO and Al2O3 contents in the rocks containing this min-eral.Therefore,the reactions between the alkaline basaltic melt from the asthenospheric mantle and orthopyroxenes from the lithospheric mantle can lead to the evolution of lithospheric mantle in the North China Craton from refrac-tory to fertile with relatively high CaO and Al203 contents.In addition,the reacted melts in some runs were transformed from the starting alkaline basaltic into tholeiitic after reac-tions,indicating that tholeiitic magma could be generated from alkaline basaltic one via reactions between the latter and orthopyroxene.

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Geochemistry,mineral paragenesis and geothermal conditions of oreforming fluids from the Ain El Bey Cu-Fe deposit:potential occurrence of native gold and precious metal traces(North African orogenic belt,Northern Tunisia)

Rania Ben AissaWiem Ben AissaSaid TligLassaâd Ben Aissa...

366-384页

查看更多>>摘要：The Ain El Bey abandoned mine,in North-West Tunisia,fits into the geodynamic context of the European and African plate boundary.Ore deposit corresponds to veins and breccia of multiphase Cu-Fe-rich mineralization related to various hydrothermal fluid circulations.Petro-mineralogical studies indicate a rich mineral paragenesis with a minimum of seven mineralization phases and,at least,six pyrite generations.As is also the case for galena and native silver,native gold is observed for the first time as inclusion in quartz which opens up,thus,new perspec-tives for prospecting and evaluating the potential for noble metals associated with the mineralization.Scanning Elec-tron Microscope—Energy Dispersive Spectroscopy and Transmission electron microscopy analyses show,in addition,a large incorporation of trace elements,including Ag and Au,in mineral structures such as fahlores(tetra-hedrite-tennantite)and chalcopyrite ones.The mineral/mineral associations,used as geothermometers,gave esti-mated temperatures for the mineralizing fluids varying from 254 to 330 ℃ for phase Ⅲ,from 254 to 350 ℃ for phase Ⅳ,and from 200 to 300 ℃ for phases Ⅴ and Ⅵ.The seventh and last identified mineralization phase,marked by a deposit of native gold,reflects a drop in the mineralizing fluid's temperature(＜200 ℃)compatible with boiling conditions.Such results open up perspectives for the development of precious metal research and the revaluation of the Cu-Fe ore deposit at the Ain El Bey abandoned mine,as well as at the surrounding areas fitting in the geodynamic framework of the Africa-Europe plate boundary.

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