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中国地球化学学报：英文版

中国地球化学学报：英文版

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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，获得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。
  • 发文量：2218
  • 被引量：1000
  • H指数：8
  • 开始收录时间：1988(2)
  • CNKI综合因子：0.396
  • 维普期刊影响因子： 0.41
  • 万方期刊影响因子：0.19
  • 创刊时间：1982
  • 国内刊号/CN：52-1161/P
    国际刊号/ISSN：2096-0956
  • 发行周期：双月刊
    邮发代号：2-577
  • 主管单位：中国科学院出版图书情报委员会
    主办单位：中科院地球化学研究所
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  • 主编：Congqiang Liu
  • 电话：0851-85891358
  • 邮箱：geochem@vip.gyig.ac.cn
  • 地址：Editorial Office of Acta Geochimica, Institute of Geochemistry, Chinese Academy of Sciences, 99 Lincheng Road West, Guiyang City, Guizhou Province
  • 邮编：550081
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中国地球化学学报：英文版 >2023年第5期

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  • 摘要：A nickel laterite deposit occurs in the Vatera area of Lesvos Island,Greece ,and is transgressively developed on serpentinized basic rock (norite).The overlying sedimentary rocks include marls and marly limestones with sandstone intercalations and belong to the Pliocene sed-iments.The following alteritic zones are defined from the bottom to top layers:a)bedrock (norite);b)serpentinized zone;c)goethitic zone.The bedrock consists of the following pri-mary minerals:basic plagioclase,orthopyroxenes and clinopyroxenes.The serpentinized zone includes clinochrysotile,lizardite,antigorite clinoenstatite,calcite and dolomite while in the goethic zone there are goethite,quartz,pyrite,chromite,dolomite.Al2O3 ,Fe2O3,CaO,Na2O,K2O,Ba,Sr,Ni,C and S are enriched in the goethitic zone .Nickel enrichment is re-lated to the formation of nickeliferons minerals substituting for Mg or/and Fe in the goethite and pyrite.Enrichment of Ni in the matrix may be due to the presence of amorphous Ni-sili-cates(pimelite).There is a significant change(decrease)in the concentration of Ni from the top to bottom parts of the laterite formation,indicating that there was no tendency to migrate downwards(immature laterite).A second support of the immaturity of the Vatera laterite is the incomplete oxidation of ferrous iron to form ferric iron hydroxides.Under tropical/subtropical conditions,which dominated from the end of Miocene to the Pliocene the norite rocks of the Vatera area altered in response to reaction with acid solutions enriched in CO2.Due to hydrolysis and oxidation of pyroxenes,Mg2+,H4SiO4 and Ni2+ were removed in the continental acid solutions.
  • 摘要：The Campanian-Maastrichtian phosphatic deposits in Egypt,called the Duwi Forma-tion,comprise a part of the extensive Middle East to North African phosphogenic province of Late Cretaceous to Paleogene age.The province holds the greatest accumulation of phosphorites in the geological history,possibly in excess of 70 billion metric tons.The phosphate resources in Egypt alone exceed 3 billion metric tons.Two-third of these three billions occur only in the Abu-Tartur area.Among the phosphorite deposits in Egypt,the phosphorites of the Abu-Tartur area are characterized by high contents of iron ranging from 3% to 7% with an average of 5%.The detailed mineralogical and geochemical studies on the Abu-Tartur phosphorites revealed that iron is found in the form of pyrite,ankerite,clay minerals,microinclusions,and iron oxide.Pyrite,which is the major fraction,occurs as filling cement and partial to complete teplacement of phosphatic grains and confined to the fresh phosphorites while iron oxide occurs as cryp-tocrystalline aggregates of red to brown particles and is confined to the weathered outcrops.Ex-clusive relations between pyrite in the fresh phosphorite samples inside the Abu-Tartur mine and iron oxide in the equivalent horizon of the weathered exposure indicated that iron oxide was formed by the oxidation of pyrite as a result of weathering.All of these forms harm the quality of ore,manufacturing processes,and the produced phosphoric acid and fertilizers.
  • 摘要：The electric conductivity of gabbro has been measured at 1.0-2.0 Gpa and 320-700℃,and the conduction mechanism has been analyzed in terms of the impedance spectra.Experimental results indicated that the electric conductivity depends on the frequency of alter-native current.Impedance arcs representing the conduction mechanism of grain interiors are displayed in the complex impedance plane ,and the mechanism is dominated at high pressure.These arcs occur over the range of 102-k×105Hz(k is the positive integer from 1 to 9) .On the basis of our results and previous work,it is concluded that gabbro cannot form any high conductivity layer (HCL) in the middle-lower crust.
  • 摘要：In the eastern part of Chian there had occurred large-scale gold mineralization during the Mesozoic,resulting in a large number of inprotant gold ore-concentrated areas.In this paper we have selected some isotope data(including four gold deposits previously studied and two gold deposis in this work)of Au-bearing quartz veins of the representative gold deposits in six impor-tant gold ore-concentrated areas in the periphery of the North China Platform and calculated their metallogenic ages using the method of Ludwig(2.90 version).The results show that the repre-sentative gold deposits in the six gold ore-concentrated areas were formed during the Mesozoic.
  • 摘要：On the basis of mineralogical ,geochemical and micro-textural studies of the typical sections of the red weathering crust of carbonate rocks in the subtropical karst areas of Guizhou Province and Guangxi Autonomous Region,we have found,either on a microscopic or on a mac-roscopical scale and in different positions of the sections,the most direct and most important mineralogical and micro-textural evidence for the development of metasomatism in the process of weathering-pedogenesis of numerous carbonate rocks.This paper also has expounded for the first time and systematically the mechanism of metasomatism involved in the process of weathering-pedogenesis of carbonate rocks and proposed the sequence of mineral metasomatic evolution in the process of weathering-pedogenesis of carbonate rocks.
  • 摘要：The Hetai ductile shear zone-hosted gold deposit occurs in the deep-seated falut mylonite zone of the Sinian-Silurian metamorphic rock series.In this study there have been discovered melt inclusions,fluid-melt inclusions and organic inclusions in ore-bearing ruartz veins of the ore deposit and mylonite for the first time.The homogenization temperatures of the various types of inclusions are 160℃,180-350℃，530℃and 870℃ for organic inclusions,liquid inclsions two-phase immiscible liquid inclusions and melt inclusion,respectively,Ore fluid is categoriezed as the neutral to basic K+-Ca2+-Mg2+-Na+-SO42--HCO3-Cl- system.The contents of trace gases follow a descending order of H2O>CO2>CH4>(or<)H2>CO>C2H2>C2H6>O2>N2.The concentrations of K+,Ca2+,SO42-,HCO3-,Cl-,H2O and C2H2 in fluid inclusions are related to the contents of gold and the Au/Ag ratios in from different levels of the gold deposit.This is significant for deep ore prospecting in the region.Daughter minerals in melt inclusions were analyzed using SEM.Quartz,orthoclase,wollastonite and other silicate minerals were identified.They were formed in different mineral assemblages.This analysis further proves the existence of melt inclusions in ore veins.Sedimentary metamophic rocks could form silicate melts during metamorphic anatexis and dynamic metamorphism,which possess melt-soulution characteristics.Ore formation is related to the multi-stage forming process of silicate melt and fluid.
  • 摘要：Quartz samples collected from the Jinman vein Jinman vein copper deposit in theLanping Basin of western Yunnan were determined by 40Ar/39Ar fast neutron activation techniques, and the spectra are characterized as being saddle-shaped.The samples yielded a plateau age of 58.05±0.54Ma,a minimum appearance age of 56.76±0.81Ma and isochron age of 54.30±0.15Ma,the three ages being close to each other,indicating that the ages of the quartz sam-ples so far determined are true and relable.The plateau age represents the time of formation of Cu-bearing quartz veins,which is corresponding to Early Himalayan.This age is also consistent with the time at which a tectonically thermal event(60Ma) took place within the Lanping Basin,Yunnan Province.In consideration of the fact that copper ore and other ore types in the vast area of western Yunnan are concentrated mainly in the Early Himalayan strata,the au-thors believe that there must have existed some indispensable kep factors leading to metallogen-esis on a large scale during the Early Himalayan period in western Yunnan and also constraining in union the formation of ore deposits there.
  • 摘要：Throughy studies of P-T-t paths and decompressive retrograde metamorphic textures of metamorphic rocks in the East Qinling-Dabieshan region,the authors determined the Mesozoic crust rapid uplifting age,and then inferred that in the East Qinling-Dabieshan region lithosphere delamination occurred from T3 to J1.The Yanshanian granites produced by delamination are developed well in the East Qinling-Dabieshan region.But due to the Gondwana plate effect,magmatism in the region caused by delamination lagged until J3 when the northern Tibet terrane and the Eurasian plate completely amalgamated.Additionally,due to western Pacific plate subducting underneath the Eurasian plate,in the East Qinling-Dabieshan region the stress state was transformed from compression to extension.So in the region from J3 to K2 magmatism was most intensive,and liberalization was also relatively strong.Geophysical data reflect that in the East Qinling-Dabieshan region the asthenosphere rose to the shallow level,the Moho is flat with no mountain root,and the crustal thickness is less than 40 km on average. These features agree with those of collisional orogenes in which delamination has occurred.Through contrastin differences in surface and interior depth between east and west Qinling we believe that elamination proceeded from east to west.
  • 摘要：Organic inclusions from the Shahejie Formation of the Eogene period in the Bohai Gulf Basin,eastern China,were examined using micro-FT.IR and fluorescence microscopy in addition to the measurement of their homogenization temperatures(Th).Two populations of organic inclusions were recognized,the primary and the secondary organic inclusions.The primary organic inclusions contain organic materials with relatively long alkyl chains(the carbon atom number is 15 to 17),whereas the secondary organic inclusions contain a certain amount of H2S besides organic materials which have relatively short alkyl chains with the carbon atom number of 5 to 6.The Th values of the primary organic inclusions within the rage of 87-91℃,lower than those of the secondary organic inclusions(Th=98-105℃）,sugesting that the primary organic inclusions experienced a lower degree of thermal evolution than the secondary inclusions.This inference is consistent with the fluorescence spectroscopic characteristics and parameters(Tmax,Q values)of the organic inclusions.Data from the organic inclusions together with the petroleum geology setting revealed that the primary inclusions resulted from the migration of hydrocarbons generated within the strata they are hosted,whereas the secondary organic inclusions were trapped in the process of secondary hydrocarbons expelled out of the source rocks to the locations where they were accumulated.The thermal properties of the organic inclusions are consistent with the maturation of the oil generated from the Shahejie Formation.The abundance of the organic inclusions and their characteristics indicate that the member Es3 of the Shaheije Formation is highly potential for oil accumulation.The results could provide essential coues to petroleum exploration in the Bohai Gulf Basic.
  • 摘要：An approach is recommended for the correction of common Pb contribution to 207Pb/206Pb ages obtained by the zircon evaporation technique.A comparison with that by Cocherie et al.(1992)shows that two approaches yield similar results in the 207Pb*/206Pb* ratios.But when using the new approach,only two errors of the measured 204Pb/206Pb and 207Pb/207Pb ratios are introduced to the calculated 207Pb*/206Pb* ratios.
  • 摘要：In our work,ocean ridge granite,i.e., Oytan plagiogranite massif,was discovered in western Qinghai-Xizang plateau.It intruded into the basic lava of the Oytag ophiolite suite and it was formed a little later than the (ultra)mafic rocks of the Oytag ophiolite suite.The Oytang plagiogranite possesses the geochemical characteristics of mantle-source granite and was formed in the “supre-subduction zone”(SSZ)ocean ridge environment,like the ocean ridge granite of Troodos,Cypus.
  • 摘要：Systematic geochemical studies have been conducted on the North Kueda Pluton,West Kunlun,in order to reveal its petrogenesis and tectonic implications.The North Kueda Pluton is a potassium-rich(K2O>5.4wt%)I-type granitic pluton and does not contain any alkaline ferromagnesian mineral.Its relatively high REE,LILE(e.g.Rb,Cs,U and Th)and HFSE(e.g.Nd,Zr)contents make it very akin to the A-type granites.Its heterogenenous Sr(87Sr/86Sri=0.7049-0.7098)and Nd(εNdT=-1.05--4.04)isotope compositions preclude the possibility of a pure sedimentary or igneous source.Instead,its geochemical compositions suggest that it may be derived from partial melting of a complex source,which onsists of igneous and sedimentary rocks.Its intraplate characteristics,together with coeval mafic dykes, indicate an extensional environment at the end of Caledonian.The recognition of the extensional event does not support a continuous subduction-accretion model for the Paleozoic tectonic evolution of the West Kunlun Mountains.On the Contrary,it provides new evidence for the twostage island-arc model.
  • 摘要：The thermodynamic calculation of dehydration reacton suggests very low activity of H2O during metamorphic peak of the Archaean granulite complex in the region studied.The αH2O values for Al-rich gneiss and hypersthene biotite gneiss-granulite in the Taipingzhai region are usually between 0.10 and 0.20,and those in the Louzishan region are 0.15-0.25.The fugacity of O2 in terms of lgf O2 in whole region ranges form-8to-14.The average coefficients of (δμH2O/δHMgBt)and(δμO2/δXMgBt)in the Taipingzhai region are-0.293 and-1.60 respectively,and those in the Louzishan region are-0.364and-1.420.The activity of H2O is very low in the whole region,but its values and other data mentioned above are considerably constant from place to place within a given region,even in rocks of dirrerent lithological characters.However,they show a certain gradient between different regions.Such characteristics are compatible with the genetic mechanism known as“carbonic metamorphism” put forward by Newton et al.,i.e.,the α H2O during the peak stage is controlled by permeation of pervasive CO2 influx of the mantle source,and shows features of external buffering.
  • 摘要：Based on their REE contents and REE patterns,eclogites from the ultra-high pressure metamorphic belt in central China may be roughly divided into xis types including LREE-rich.LREE-rich+positive Eu anomaly,LREE-rich+negative Eu anomaly,REE pattern-smooth,MREE-rich and HREE-rich.The LREE_rich,LREE-rich+positive Eu anomaly and LREE-rich+negative Eu anomaly types of eclogites are dominant .REE types of eclogites in different areas can be compared and the REE feactures of the same REE type of eclogites in different areas are similar.The results of reconstruction of the primary rocks show that the primary rocks of eclogites possibly are dominated by continental tholeiites which are the product of partial melting of relatively fertile mantle and the rocks of tholeiite crystallization-differentiation.There is perfect evolution relationship among the primary rocks of the LREE-rich, LREE-rich+positive Eu anomaly and LREE-rich+negative Eu anomaly types of eclogites and among those of the REE pattern smooth and MREE-rich types of eclogites,the former three types were deried from continental settings and the latter two from nearly oceanic settings.Meanwhile,it is concluded that the mantle sources of primary rocks of the eclogites are inhomogeneous and the primary rocks of eclogites in this area appear to have undergone varying degree of crustal contamination.
  • 摘要：Leping coal (including barkinite-rich coal) is a unique kind of coal,which is widely distrbuted in the Late Permian Longan Formation,South China,In this paper,ROck-Eval,Py-GC and simulation experiment via an open-system were used to study the hydrocarbon-generating potential,hydrocarbon composition.and hydrocarbon-generating model of barkiniterich coals from the shuicheng coal field of Guizhou Province,Southwest China.The results show that barkinite-rich coals have high hydrocarbon-generating potential,with S1+S2 being 211-311mg/g,and can produce large amounts of hydrocorbon at the high-maturity stage,mostly within the temperature range of 420-450℃(corresponding to VR0 1.1-1.5%);barkinite-rich coal is one of the better oil sources and light hydrocarbon and wet gas are the major hydrocarbon components,which account for 45% and 33% of the total hydrocarbons.respectively.These characteristics are of importance for exploring oil and gas resources in the Late permian Longtan Formation coals,southwest China.
  • 摘要：There were strong volcanic and hot spring activities in Late proterozic in the Xiqiu mining district,Zhejiang province,The volcanic rocks and hydrothermal sedimentary cherts have high contents of the major metallogenic elements,Their atomic percentage of Cu:Zn:Pb is similar very much between volcanic rock,hydrothermal sedimentary chert and ore.Therefore,the metallization has a direct bearing on the volcanic and hot spring activities in the Xiqiu area.The δ34S values vary from -6.5‰to 2.8‰,the δ30Si Values from-0.2‰ to 0.6‰,and the δ18O Values from 8.14‰ to 22.32‰,Lead isotopes were derived mainly from the lower crust.The ores have high contents of As,Sb,Bi,Ga,Zn,and Ba,and low Al/(Al+Fe+Mn)ratios,with Zn/(Zn+Pb)ratios approximate to unity,Therefore,the Xiqiu massive copper sulfide deposit can be ascribed to volcano-hot spring deposition.
  • 摘要：The Upper Sinian bedded cherts are widely distributed on the southeast continental margin of the Yangtze plate,with a total thickness ranging from 20 to 150m,The cherts are very simple in chemical composition,with the contents of siliceous minerals exceeding 90% and those of other mineral species being very low.The total content of trace elements is considerably varialbe,The contents of most trace elements are low as compared with their crust clarke values.But these cherts are very rich in the trace elements Ba,As,Ab,Ag and U,coupled with relatively high contents of Fe,Mn and low contentsof Al,Ti,and Mg,It can be identified as the cherts of hydrothermal origin in terms of the values of Fe/Ti,(Fe+Mn)/Ti,Al/(Al+Fe+Mn)and U/Th,In the Al-Fe-Mn,and Fe-Mn-(Cu+Ni+Co)×10 diagrams and lg[U]-lg[Th],Cr-Zr diagrams.all the samples from the area studied fall within the hydrothermal sediment field .All these characteristics show that the cherts are mainly the product of hydrothermal processes.The fact that the δ30Si values of the chert range from 0.0‰ to 0.7‰ with δ18O from 20.1‰to 23.6‰ cleraly manifests that the submarine hydrothermal water is the main source of silica.
  • 摘要：During the paleozoic,the Northern Tianshan region of China in Central Asia consists of 7 allochthonous terranes which were situated in the ancient sino-Mongolian Ocean as volcanic arcs and splitted continental fragments.The tectonic framework was similar to that of Southwest pacific today,In the Late Paleozoic,these terranes started mutual amalgamation to cause strong thrusting.At thd end of Carboniferous,the Sino-mongolian ocean including several inter-terrane small sea basins closed and these terranes accreted on the margins of the Siberian and Tarim continents,The 6 ophiolitic zones zomong the terranes recorded this collision event.
  • 摘要：Ice core δ18O recorde from the No.a glacier at the head of the Urumqi River were used o characterize the relationship between δ18O and contemporaneous surface air temperature(Ta) nearby the Daxigou Meteorological Station(3539 m above sea level,-2km away from the ice core drilling site),Although the ice core records of annually averaged δ18O are positively correlated with conemporaneous surface air temperature,especially summer air temperature,the correlation is less significant than that for the precipitation samples due to depositional and post-depositional modification processes,However,the Climatological significance of the ice corδ18O records can be still preserved to a certain degree,which moght extend the application of high altitude and sub-tropical ice core δ18O records to paleoclimate reconstruction.
  • 摘要：In northern Qinghai-Tibet Plateau there are developed Cenozoic volcanic rocks.They constitute a trachybaslt-shoshonite-latite-trachydacite assemblage.According to the forming ages,three Cenozoic volcanic rock lithozones can be distinguished in the northern part of the plateau.Cenozoic volcanic rocks and muscovite/wto-mica granites forming the three belts in pairs represent the northern and southern margins of the plateau in different peroids,In fact,tpe tectoinc setting of the northern part of the Qinghai-Tibet plateau in different periods,In fact,the tectonic setting of the northern part of the Qinghai-Tibet Plateau is significantly different from that of the southern part-Himalayas.The southern part has experienced subduction and continent-continent collsion.There are developed the Cenozoic S-type granites(muscovite/two-mica granites)there.But the northern part is characterized by Cenozoic basaltic magmatism which obviously somes from the upper mantle,Slight doming of the upper mantle is recognized underneath the northern part of the plateau,which is the result of resistance of the Tarim plate to the north direction-sense movement of the TIbertan plate.And at the same time,the uplift machanism shows that the formation of the Qinghai-Tibet plateau involved three oprogenic stages(35-23Ma,23-10Ma and <2 Ma) of uplift in the vertical direction and extension in the horizontal direction with the Gangdise-Qiangtan orogenic belt as its core.
  • 摘要：Gross compositions and distribution of saturated and aromatic hydrocarbons in Carboniferous sandstone reservoire rocks in oil and water zones for Tzhong-10 well of the Zhongyang Uplift in the Tarim Basin were studied in dteail by means of Rock-Eval Pyrolysis,thin-chromatograph-flame ionization detection(TLC-FID),gas chromatography,gas chromatography-mass spectrometry.The results suggest that the gross composition of reservoir hydrocarbons between the oil zone and the water zone show significant differences,Water wahing has a dramatic effect on saturated hydrocarbon blomarkers,especially drimane series compounds,Drimane series compounds in the water zone have been depleted completely.However,the contents of tricyclic iterpanes and pentacyclic triterpanes tend to decrease slightly,but the water-zone reservoir hydrocarbons contian a large amount of gammacerane.This suggests that gammacerane be more resistant to water washing than diterpanes and homohopanes.The contents of pregnane,homopregrane,diasteranes relastively decrease as a result of water washing.Water washing has a noticeable effect on polycyclic aromatic hydrocarbon compounds,especially aromatic sulfur compounds,and the contents of dibenzothiophene series compounds and benzonaplyiothipophene decrease significantly as a result of water washing.However,the conterts of bicyclic and tricyclic aromatic hydrocarbons decrase slightly and those of tetracyclic and pentacyclic aromatic hydrocarbons,especially benzofluoranthene and benzopyrenes,increase markedly owing to adecrease in light aromatie hydrocarbons as a result of water washing.
  • 摘要：Delamination occurs mainly in the lithospheric mantle,involving interaction with the asthenosphere,the process of which is hard to observe directly.our research on granitoids in the western kunlun orogenic belt,China,indicates that high conternts of the heat-producing elements Th and U may furnish lithospheric delamination with new evidence,At the same time,we have established the Th-SiO and U-SiO2 diagrams to discriminate delamination.

    中国地球化学学报：英文版的期刊信息

    • 曾用名：中国地球化学学报（英文版）Chinese Journal of Geochemistry;中国地球化学(英文版);Chinese Journal of Geochemistry;中国地球化学学报(英文版)Chinese Journal of Geochemistry
    • 创刊时间：1982
    • 地区：CN
    • 语言：中文
    • 热门主题：GEOCHEMISTRY GEOCHEMICAL_CHARACTERISTICS GEOCHEMICAL 水文化学 HEAVY_METAL GUIZHOU_PROVINCE 地球化学 SEDIMENTS SOUTHWEST_CHINA REE
    • 学科分类：

      4

      Earth and Planetary Sciences:Geochemistry and Petrology;

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    • 通讯地址：Editorial Office of Acta Geochimica, Institute of Geochemistry, Chinese Academy of Sciences, 99 Lincheng Road West, Guiyang City, Guizhou Province
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