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地质学报（英文版）
中国地质学会
地质学报（英文版）

中国地质学会

程裕淇

双月刊

1000-9515

geoacta@public3.bta.net.cn

010-68999024

100037

北京复外百万庄26号

地质学报（英文版）/Journal Acta Geologica SinicaCSCDCSTPCDSCI
查看更多>>本刊以反映中国地质界在地质科学理论研究、基础研究和基本地质问题研究的最新、最重要成果为主要任务，兼及新技术与方法。全面系统地向国外读者介绍中国地学研究的新进展。
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    Phanerozoic Tectonic Evolution,Metallogenesis and Formation of Mineral Systems in China

    CHEN XuanhuaHAN LeleDING WeicuiXU Shenglin...
    819-842页
    查看更多>>摘要：The continental Asia is mainly composed of three major tectonic regimes,the Tethys,Paleo Asian Ocean,and West Pacific.It underwent multi-stage plate convergences,ocean-continent transformations,and subductions,collisions and/or collages,and post collisional(orogenic)extensions in Phanerozoic.Tectonic evolution of the Asia brings up a unique fault system and tectonic geomorphological features in the mainland China.Also,it provides a geodynamic background for the formation and evolution of metallogeneses and mineral systems,resulting in nonuniform distribution of tectono-metallogenic systems and metallogenic belts.The spatiotemporal distribution of mineral deposits in China and adjacent areas exhibits periodic variation under controlling of the full life Wilson cycle and tectonic evolution,forming the plate convergence-related mineral system in East Asia.Porphyry Cu deposits are mainly related to compressional systems in Paleozoic and early Mesozoic,and more closely related to post-collision extensional settings in late Mesozoic and Cenozoic.Orogenic Au deposits mainly formed in post-orogeny extensional setting.Alkaline rock related rare earth element deposits formed mainly at margins of the North China and Yangtze cratons.Granite-pegmatite Li and other rare metal deposits formed mainly in early Mesozoic,related to Indosinian post-orogeny extension.Tectono-metallogenic systems provide important basis for the prospecting of mineral resources.
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    A Novel Three-stage Tectonic Model for Mississippi Valley-type Zn-Pb Deposits in Orogenic Fold-and-Thrust Belts

    SONG Yucai
    843-849页
    查看更多>>摘要：Mississippi Valley-type(MVT)Zn-Pb deposits predominantly form within both orogenic forelands and fold-and-thrust belts,yet the mineralization process within the latter tectonic setting remains inadequately understood.This study,through a comprehensive review of MVT deposits across global fold-and-thrust belts,introduces a novel model elucidating the mineralization process in the context of tectonic belt evolution.It is demonstrated that during the stage I,regional compression is introduced by early stages of plate convergence,causing the folding and thrusting and creating structural or lithological traps such as evaporite diapirs and unconformity-related carbonate dissolution-collapse structures.Thereafter,in stage Ⅱ,hydrocarbons begin to migrate and accumulate within these traps,where reduced sulfur is generated through thermochemical or bacterial sulfate reduction concurrent with or preceding Zn-Pb mineralization.In the subsequent stageⅢ,as plate convergence persists,the regional stress transitions from compression to transpression or extension.Under these conditions,steeply-dipping extensional faults are generated,facilitating the ascent of metalliferous brines into early-formed structural or lithological traps.Precipitation of Zn and Pb sulfides occurs through the mixing of Zn-Pb-transporting fluids with pre-existing reduced sulfur or by interaction with hydrocarbons.
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    Kuedinskie Kluchiki,a Unique Middle Permian Biota Locality as a Key-point for Reconstruction of Late Paleozoic Terrestrial Ecosystems of the Urals,Russia

    Serge V.NAUGOLNYKH
    850-866页
    查看更多>>摘要：Field work focused on the Kuedinskie Kluchiki locality,Perm region,Urals,Russia,which contains a rich assemblage of diverse fossil organisms including higher plants(equisetophytes,pteridosperms,ginkgophytes,conifers,vojnovskyans)represented by stems,leaves and reproductive organs;invertebrates(mollusks,arthropods),and tetrapods(temnospondyl amphibians,seymouriamorphs,cotylosaurs,synapsids,diapsids),as well as bony fishes.General characteristics of the taxonomical composition of the Kuedinskie Kluchiki locality are given.A new peltaspermalean pteridosperm taxon,Compsopteris longipinnata sp.nov.,and a voltzialean conifer Archaeovoltzia kuedensis sp.nov.are described.General considerations on the paleoecologic and paleogeographic conditions of the Kuedinskie Kluchiki locality origin are given.
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    Hydro-uvarovite from Mantle Peridotites of Naga Hills Ophiolite:A Mineral Tracer for Neo-Tethyan Mantle Wedge Metasomatism

    Anisha VERENCARAbhishek SAHANilanjana SORCARSohini GANGULY...
    867-877页
    查看更多>>摘要：Hydrous Cr-bearing uvarovite garnets are rare in natural occurrences and belong to the ugrandite series and exist in binary solid solutions with grossular and andradite garnets.Here,we report the occurrence of hydrous uvarovite garnet having Cr2O3 upto 19.66 wt％and CaO of 32.12-35.14 wt％in the serpentinized mantle peridotites of Naga Hills Ophiolite(NHO),India.They occur in association with low-Cr diopsides.They are enriched in LILE(Ba,Sr),LREEs,with fractionating LREE-MREE[avg.(La/Sm)N=2.16]with flat MREE/HREE patterns[avg.(Sm/Yb)N=0.95].Raman spectra indicate the presence of hydroxyl(OH-)peaks from 3500 to 3700 cm-1.Relative abundances in fluid mobile elements and their close association with clinopyroxenes are suggestive of the formation of uvarovite garnets through low temperature metasomatic alteration of low-Cr diopsides by hydrothermal slab fluids.The high LREE concentration and absence of Eu anomaly in the garnet further attest to alkaline nature of the transporting slab dehydrated fluid rather the involvement of low-pH solution.The chemical characteristics of the hydroxyl bearing uvarovite hosted by the mantle peridotite of NHO deviate from the classical features of uvarovite garnet,and their origin is attributed to the fluid-induced metasomatism of the sub arc mantle wedge in a suprasubduction zone regime.
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    Mantle Driven Early Eocene Magmatic Flare-up of the Gangdese Arc,Tibet:A Case Study on the Nymo Intrusive Complex

    MA XuxuanJoseph G.MEERTCAO WenrongTIAN Zuolin...
    878-903页
    查看更多>>摘要：Magmatic periodicity is recognized in continental arcs worldwide,but the mechanism responsible for punctuated arc magmatism is controversial.Continental arcs in the Trans-Himalayan orogenic system display episodic magmatism and the most voluminous flare-up in this system was in early Eocene during the transition from subduction to collision.The close association of the flare-up with collision is intriguing.Our study employs zircon Lu-Hf and bulk rock Sr-Nd isotopes,along with mineral geochemistry,to track the melt sources of the Nymo intrusive complex and the role of mantle magma during the early Eocene flare-up of the Gangdese arc,Tibet.The Nymo intrusive complex is composed of gabbronorite,diorite,quartz diorite,and granodiorite which define an arc-related calc-alkaline suite.Zircon U-Pb ages reveal that the complex was emplaced between～50-47 Ma.Zircon Hf isotopes yield εHf(t)values of 8.2-13.1,while whole-rock Sr and Nd isotopes yield εNd(t)values of 2.7-6.5 indicative of magmatism dominated by melting of a juvenile mantle source with only minor crustal assimilation(～15％-25％)as indicated by assimilation and fractional crystallization modeling.Together with published data,the early Eocene magmatic flare-up was likely triggered by slab breakoff of subducted oceanic lithosphere at depths shallower than the overriding plate.The early Eocene magmatic flare-up may have contributed to crustal thickening of the Gangdese arc.This study provides important insights into the magmatic flare-up and its significant role in the generation of large batholiths during the transition from subduction to collision.
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    Lower Continental Crusts Involved in the Alpine Orogeny:New Insight from the Santa Lucia Nappe Metasediments(Corsica,France)

    Chiara FRASSIMaria DI ROSALuca PANDOLFIMichele MARRONI...
    904-920页
    查看更多>>摘要：In the Alpine Corsica(France),the Santa Lucia Nappe represents a peculiar unit preserving the unique relicts of Paleozoic lower to medium continental crust.It consists of composite basement affected by Permian granulite facies metamorphic conditions unconformably covered by a Late Cretaceous clastic sequence(Tomboni Conglomerate and Tralonca Flysch)affected by polyphase deformation and low-grade-metamorphism.In this work,we present a new reconstruction of the deformation events registered by the Tralonca Flysch during the Alpine orogeny.The D1 phase was testified by rare isoclinal folds.The D2 phase produced a continuous foliation and a map-scale sheath-fold with a top-to-W sense of shear.The D3 phase produced E-verging non-cylindrical folds and S3 crenulation cleavage that is not associated to metamorphic blastesis.We present the first temperature-pressure-deformation(P-T-d)path for the Tralonca Flysch,demonstrating that the Santa Lucia Nappe underwent accretion and then first stage exhumation in the Alpine wedge during the D1 phase with pressure and temperature peaks both occurred under blueschist metamorphic conditions.The D2 phase occurred at lower pressure-temperature conditions during a second stage exhumation.This pressure-temperature-deformation path is comparable with those of the Lower Units(i.e.,the subducted continental units of Alpine Corsica)suggesting a common geodynamic history.
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    Kink-band Kinematic Analysis and its Implications for Late-stage Deformation in the Internal Parts of the Zagros Collision(Sanandaj-Sirjan Zone)in West Iran

    Maryam HEYDARIMahdi BEHYARI
    921-935页
    查看更多>>摘要：In the internal parts of the Zagros collision zone,several deformation phases have been superimposed.The early deformation phase caused the development of a penetrative foliation.The late-stage deformation phase was preferentially accommodated within shear zones and caused the generation of shear bands,implying a non-coaxial component of deformation,the end of this stage deformation was marked by the development of kink-bands.In the vicinity of Zagros suture zone,the kink angle increased from 40° to 60°,and the kink-bands was converted to chevron folds.In this region,the external(α)and internal(β)angular ratio is α/β ≠ 1 and kink angle increased,and deformation occurred with 10％to 30％volume loss.Farther from the suture zone in the east,α/β=1;and total volume was constant or increased by 5％to 10％.Kink-bands kinematic analysis in the study area revealed this structures were sensitive to deformation conditions and components such that,with decreasing distance to the Zagros suture zone,shearing and rotation increased,a high kinematic vorticity dominated,and volume loss occurred during deformation.
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    Effects of Intracratonic Strike-slip Fault on the Differentiation of Carbonate Microfacies:A Case Study of a Permian Platform Margin in the Sichuan Basin(SW China)

    LIU JiaweiWU GuanghuiTANG QingsongWU Yonghong...
    936-954页
    查看更多>>摘要：In intracratnoic basins,the effect of strike-slip faults on sedimentary microfacies is generally underestimated due to their small scale.Based on the integration of core,well logs,and three-dimensional seismic data,this study presents a comprehensive analysis of the Permian carbonate platform and strike-slip faults in the southwestern Kaijiang-Liangping trough of the Sichuan Basin.The relationship between strike-slip faults and Permian carbonate microfacies is investigated.The results reveals the existence of a NW-trending strike-slip fault zone along the platform margin,exhibiting clear segmentation.The western side of the study area exhibits a rimmed platform margin characterized by type Ⅰ reefs,which corresponds to the presence of a large-scale strike-slip fault zone.In contrast,the eastern side is characterized by a no-rimmed and weak rimmed platform margin,accompanied by type Ⅱ reefs,which align with smaller strike-slip fault zones.It was found that the strike-slip fault had some effects on the platform and reef-shoal complex of the Permain Changxing Formation.First,the platform was divided by strike-slip fault into three segments to show rimmed,week rimmed and no-rimmed platform.Second,reef-shoal complex devolped along the faulted high position in the strike-slip fault zone,and separated by faulted depression.Third,strike-slip faults can offset or migrated the reef-shoal complex and platform margin.Additionally,the thickness of the platform margin varies across strike-slip fault zone,which is related to the activity of strike-slip faults.The strike-slip faults affect the microfacies by controlling the pre-depositional paleotopography.This case suggests that the strike-slip faults play a crucial role in the diversity and distribution of carbonate microfacies in the intracratonic basin.
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    Geochronology and Petrogenesis of Late Carboniferous to Early Permian Basalts in the Central Lhasa Subterrane,Southern Tibet:Implications for the Evolution of the Sumdo Paleo-Tethys Ocean

    MA WangLIU YingchaoYANG ZhusenJan-Marten HUIZENGA...
    955-968页
    查看更多>>摘要：Basalts from the Late Carboniferous to Early Permian are extensively developed in the central Lhasa subterrane,southern Tibet.Studying the petrogenesis of these rocks may have implications for the late Paleozoic arc magmatism along the central Lhasa subterrane uncovering more of the evolution of the Sumdo Paleo-Tethys Ocean and its dynamic mechanism.Basalt samples from the Luobadui Formation in the Leqingla area,NW of Linzhou City in the central Lhasa subterrane,southern Tibet exhibit arc-like geochemical signatures in a subduction-zone tectonic setting characterized by high Al2O3 and low TiO2 contents,fractionated REE patterns with low Nb/La ratios and high LREE concentrations,and negative HFSE anomalies.Based on their higher Th/Ce,Nb/Zr,and lower Ba/Th,Pb/Nd ratios,slightly negative to positiveεNd(t)values,and the relatively high Sr-Pb isotopic compositions,these samples were probably derived from partial melting of a depleted mantle source of garnet+spinel lherzolite,metasomatized by subducted sediments around 297 Ma.Modeling of the trace elements indicates that these basalts experienced fractional crystallization of olivine,clinopyroxene and minor plagioclase during magma ascent and eruption.It is proposed that these Late Carboniferous-Early Permian basalts are associated with the northward subduction of the Sumdo Paleo-Tethys Ocean seafloor along the southern margin of the central Lhasa subterrane.
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    Genesis of the Jianbeigou Gold Deposit on the Southern Margin of the North China Craton:Insights from Fluid Inclusions,H-O-S Isotopes,and Pyrite in situ Trace Element Analyses

    LI FengchunZENG QingdongZHU RixiangCHU Shaoxiong...
    969-991页
    查看更多>>摘要：The Jianbeigou gold deposit is a typical lode gold deposit in the Qinling metallogenic belt,located on the southern margin of the North China Craton.Three stages of the hydrothermal process can be distinguished,including the quartz±pyrite,quartz-polymetallic sulfide,and quartz-carbonate±pyrite stages.From the early to late stages,the homogenization temperatures of primary fluid inclusions are 281-362℃,227-331℃,and 149-261℃,respectively.The corresponding salinities estimated for these fluids are 3.9-9.9 wt％,0.4-9.4 wt％,and 0.7-7.2 wt％NaCl equiv.Combined with laser Raman spectroscopy data,the ore-forming fluid belongs to a H2O-CO2-NaCl±CH4 system with medium-low temperature and salinity.The δ18Ofluid and δD values for the quartz veins are-1.0‰ to 6.0‰ and-105‰ to-84‰,respectively,which indicates that the ore-forming fluid is of mixed source,mainly derived from magma,with a contribution from meteoric water.Pyrite has been identified into three generations based on mineral paragenetic sequencing,including Py1,Py2,and Py3.The pyrites have δ34S sulfur isotopic compositions from three stages between 3.7‰ and 8.4‰,indicating that sulfur mainly originated from magma.Te,Bi,Sb,and Cu contents in pyrite were all high and showed a strong correlation with Au concentrations.Native gold and the Au-Ag-Bi telluride minerals were formed concurrently,and the As concentration was low and decoupled from the Au content.Therefore,Te,Bi,Sb and other low-melting point chalcophile elements play an important role for gold mineralization in arsenic-deficient ore-forming fluid.Combined with the geological setting,evolution of pyrite,and ore-fluids geochemistry,we propose that the Jianbeigou deposit can be classified as a magmatic-hydrothermal lode gold deposit.Gold mineralization on the southern margin of the North China Craton is related to Early Cretaceous magmatism and formed in an extensional setting.
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