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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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    Review of the Triassic Curvicubitidae(Insecta:Hemiptera),with Description of New Material from China

    ZHANG QianqiEdmund A.JARZEMBOWSKIWANG BoZHANG Haichun...
    1419-1428页
    查看更多>>摘要：The Curvicubitidae is a Triassic cicada family with some taxa systematically debatable.Here a new curvicubitid species,Beaconiella tongchuanensis sp.nov.,is established from the Middle Triassic Tongchuan Entomofauna in NW China.Restudy of the two Australian species of Beaconiella Evans,1963(B.fennahi and B.multivenata)confirms that they are different species and first reveals the hindwing venation of B.multivenata.A detailed restudy of Curvicubitus triassicus Hong,1984 confirms the treatment of Curvicubitus as a junior synonym of Beaconiella.A key to all the six species of Beaconiella in Curvicubitidae is first given.Although reported from only three sites,the family Curvicubitidae potentially was globally distributed during the Middle-Late Triassic,implying that this family probably originated as early as the Early Triassic or even the Permian.
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    Detrital Zircon U-Pb Dating for Clastic Rocks from Boreholes in the Eastern Junggar Basin:Constraints on Permian Tectonics in the Southern Central Asian Orogenic Belt

    REN XinchengZHANG GuanlongWANG JinduoZHANG Kuihua...
    1429-1440页
    查看更多>>摘要：Permian sedimentary successions,widely distributed in the eastern Junggar Basin,may record key details on the closure of the Paleo-Asian Ocean in this region.Results of boreholes show that Permian strata is mainly composed of mudstone,sandy mudstone,siltstone,sandstone,sandy conglomerate,dolomite,and limestone.Detrital zircon U-Pb dating results of three sandstone samples yielded the calculated maximum ages of 296 Ma,278 Ma and 293 Ma,indicating they possibly deposited during the Early Permian.Permian strata in the eastern Junggar Basin show similar rock associations and detrital zircon age data distribution patterns.Our new and compiled age data for sandstone samples in the eastern Junggar Basin and Bogda region yield predominant Paleozoic ages,close to their sedimentary ages.Such detrital zircon age data distribution patterns support the hypothesis that these Early Permian meta-clastic rocks in the eastern Junggar Basin and Bogda region were deposited in a subduction-related basin,and indicate an Early Permian Ocean prevented Precambrian detritus from the Central Tianshan block from depositing in the eastern Junggar Basin and Bogda region.
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    Provenance Analysis of the Cenozoic Sedimentary Successions in the Ningnan Basin,NE Tibetan Plateau:Constraints on Sedimentological and Tectonomorphological Evolution

    ZHAO XiaochenZHAO ShaoweiLIU ChiyangWANG Jianqiang...
    1441-1460页
    查看更多>>摘要：The evolution and reforming history of the Cenozoic basins in the northeastern Tibetan Plateau(NETP)are significant for understanding the northeastward growth of the Tibetan Plateau.The sediments in these basins archived the spatial-temporal patterns of the surface uplift and deformation processes in response to remote effects of growth of the NETP.Here,we present an integrated provenance analysis of the Ningnan basin in the NETP to provide direct insights into the basin evolution and further constraints of the Tibetan Plateau's northeastward growth.In this study,the Cenozoic strata(Sikouzi,Qingshuiying,Zhang'enpu and Ganhegou formations)in the Ningnan basin yield complex detrital zircon age distributions featured by predominant age populations at 200-360 Ma and 360-540 Ma with minor Precambrian ages.Detrital zircon U-Pb ages indicate that the southwestern Ordos Block,the western Qinling orogenic belt,and the eastern Qilian orogenic belt are primary source areas.Additionally,adjacent local paleo-uplifts(e.g.,Xihua,Nanhua,Xiangshan,Liupan Mts.)also provided minor volumes of sediment.In addition,conglomerates and paleocurrent directions of the Sikouzi-Ganhegou formations exhibit an apparent change since the late Miocene,revealing an obvious provenance shift.The quantitatively determined mixing proportions of the surrounding source areas also reveals that the early source-to-sink system was replaced during the deposition of the Ganhegou Formation.Combined with previous studies,we suggest that the formation of the Ningnan basin was controlled by normal faults in extension setting and experienced continued sediment accumulation during the Qingshuiying-Zhang'enpu period;since the late Miocene,the significant provenance shift reflects the obvious northeastward growth of the NETP and led to the extinction of the Ningnan basin.
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    Origin of Felsic Microgranitoid Enclaves in Granite in Zhangjiakou District,China:Implication for Process and Lifespan of Granitic Magma Chambers

    WANG DazhaoLIU YuhangLENG ChengbiaoZHEN Shimin...
    1461-1478页
    查看更多>>摘要：Sparse felsic microgranitoid enclaves(FMEs)in the Shangshuiquan granite of the Zhangjiakou district,the north margin of the North China Craton,are fine-grained,dark-colored and exhibit subangular to subspherical shapes.They share similar mineral assemblages,chemical compositions,and zircon Hf isotope compositions to the host granite.New zircon U-Pb geochronology reveals that the FMEs crystallized at 156-153 Ma,while the Shangshuiquan granite formed at ca.146 Ma.The FEMs are,therefore,10 to 7 Ma older than the host granite.Combined with petrological evidence,we suggest that the FMEs are fragments of rapidly crystalized magmas,which were captured by the younger Shangshuiquan magma.Magmas of the FMEs and Shangshuiquan granite originated from the same reservoir.The Shangshuiquan granite is the result of small batches of magma being built up incrementally,and the FMEs belong to the earlier batches of magma.The lifespan of the Shangshuiquan magma reservoir exceeds 10 Ma.FMEs derived from cogenetic fragments have the potential to offer critical information about the formation process and timescale of granitic plutons.
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    Cognate Mafic Enclaves Formed by Cumulated Mush Convection in a Granitic Magma Chamber:Evidence from Mineral Chemistry of the Triassic Zhashui Pluton,Qinling Orogen

    ZHANG HongbingZHOU XuchenLAI ShaocongZHANG Hua...
    1479-1488页
    查看更多>>摘要：Mafic enclaves in granites are generally considered to represent coeval mafic melts that derived from metasomatized mantle,which can provide valuable information about crust-mantle interaction.Exploring the genetic links between the mafic enclaves and their host monzogranite from the Triassic Zhashui Pluton,Qinling orogenic belt.The enclaves(220±4.6 Ma)and the monzogranite(220±2.8 Ma)display identical zircon U-Pb ages,and they also share similar trace element and zircon Lu-Hf isotopes,indicating a cognate source.The monzogranite displays zircon εHf(t)values of-0.99 to+1.98,while the mafic enclaves show similar values of-0.45 to+3.26;however,differences in mineral chemistry reveal different crystallization conditions.The amphibole from the mafic enclaves has higher temperature and pressure(757℃;2.65 kbar)compared to those of the host monzogranite(733℃;1.96 kbar),suggesting that mafic minerals in the enclaves crystallized at an early stage.Moreover,apatite in the mafic enclaves displays slightly higher volatile contents(0.72 wt％)than those of the monzogranite(0.66 wt％),indicating a volatile-rich condition.These results suggest that the mafic enclaves represent early hydrous mafic cumulates in the granitic chamber,and subsequent magma convection would have led to the formation of the mafic enclaves.
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    A Comparative Study of Ore-bearing Dikes and a Barren Dike in the Zaozigou Gold Deposit,Western Qinling:Zircon Morphology,U-Pb Chronology and Geochemical Constraints

    LIU JiawangWANG ShuzhiWANG TaoCAO Chong...
    1489-1500页
    查看更多>>摘要：The Zaozigou gold deposit lies south of the Xiahe-Hezuo regional fault zone in the western Qinling orogenic belt and contains many intermediate to felsic dikes.Diorite porphyry,quartz diorite porphyry and biotite diorite porphyry are mineral-bearing dikes,whereas granite porphyry is unrelated to gold mineralization.To compare the relationship between different dikes and mineralization,this study analyzed the cathodoluminescence(CL)of zircon crystals in all four types of dikes exposed in the Zaozigou deposit,using a zircon typological classification.The formation temperature of the granite porphyry(734℃)was higher than the average temperature of the other three types of dikes(704℃),whereas the former's alkalinity index(395)was lower than the average alkalinity index of the other three dikes(425).The ∑REE amount of granite porphyry(147.18 ppm)was smaller than the average ∑REE amount of the other three dikes(246.80 ppm)and itsδEu value(0.33)was larger than the average δEu values of the other three dikes(0.30).The U-Pb ages of zircon in the four types of dikes were relatively consistent with the crystallization ages of approximately 240 Ma,which indicates that all four types of dikes intruded in the Middle Triassic.Compared to the other three ore-bearing dikes,the morphology of the zircon crystals in the barren dikes evolved from S13 to S5 and then returned to S13.These results indicate that the barren dike underwent an increase in temperature and a decrease in alkalinity,which may be an important reason for the absence of mineralization.
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    Microbial Biosignatures Associated with Iddingsite in Hadal Basalts from the Southern Mariana Trench

    GUO ZixiaoHU YazhenDU QingyingLIU Yadong...
    1501-1510页
    查看更多>>摘要：Iddingsitization is an aqueous alteration that is known to take place in meteorites and continental basalts providing a potential habitat for microbial life.However,little is known about the exact mode by which this reaction occurs in the hadal seafloor and its implication for the deep subsurface biosphere.A comprehensive investigation of hadal basalts from the southern Mariana Trench(SMT)conducted with microscopic examinations shows that iddingsite occurs as augite-hosted veins,rims,and mineral grains formed completely in place of augite within the SMT basalts.Carbon geochemistry indicates that organic matter with homogenous δ13C values between-27.8‰ and-27.2‰ might be biogenically accumulated in the SMT basalts.Furthermore,the close spatial relationships between carbonaceous matter(CM)and goethite in iddingsite point to microbial attachment to iddingsite minerals.Thus,iddingsitization might have fueled H2-utilizing microorganisms inhabiting the hadal oceanic crust,thereby leading to the formation of CM,as implied by oxygen isotopic compositions revealing low alteration temperatures(32-83℃)favorable for microbial growth.In all,microbial biosignatures associated with iddingsite in the SMT basalts are highlighted,and these results could pave the way for deciphering the deep subsurface biosphere at hadal zones.
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    Origin of Overpressure and its Effect on Hydrocarbon Enrichment in the Hinterland of Junggar Basin,NW China

    HAN ZaihuaLIU HuaLI JunCHENG Bin...
    1511-1532页
    查看更多>>摘要：Overpressure is widely developed in deep petroliferous strata in the hinterland of the Junggar Basin.However,a comprehensive understanding of its origin and effect on hydrocarbon distribution and enrichment remains lacking.In this study,we employ five empirical methods and comprehensive geological analysis to identify the origin of overpressure,and uncover the effect of overpressure on hydrocarbon enrichment.The results indicate that disequilibrium compaction is not a significant factor in overpressure generation.Instead,hydrocarbon generation,pressure transfer and diagenesis are the primary causes.The empirical methods support this conclusion.There is a positive correlation between overpressure intensity and source rock thickness and maturity.Notably,widespread cross-formational migration of hydrocarbon bearing fluid occurred,with sandstone overpressure exceeding that of adjacent shale in non-source strata.Furthermore,there is a distinct transformation from smectite to illite near the top of overpressure.Hydrocarbon generation pressurization and pressure transfer significantly effect hydrocarbon enrichment.The overpressure caused by hydrocarbon generation drives hydrocarbon migration and accumulation,establishing an optimal energy configuration between reservoir and cap rock.Faults play a crucial role in hydrocarbon vertical migration and pressure relief.The overpressure in reservoirs can reduce the porosity and permeability thresholds and enhance the charging capacity of oil and gas.
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    Formation and Evolution Mechanism of High-quality Reservoirs in the Lacustrine Hyperpycnal System:The 2nd Member of the Lower Jurassic Sangonghe Formation,Qiudong Subsag,Turpan-Hami Basin,NW China

    LI ZhiyuanHUANG ZhilongWANG JunhuiWANG Boran...
    1533-1556页
    查看更多>>摘要：Hyperpycnal deposits has gradually emerged as a current research hotspot,with a special focus on lacustrine hyperpycnal deposits.However,our understanding of the formation mechanism and distribution of high-quality reservoirs in hyperpycnal deposits remains insufficient.In this study,the formation mechanism and distribution of high-quality reservoirs in the second member of the Sangonghe Formation are studied through sedimentology,petrology,and geochemistry,and 10 types of lithofacies were identified in the depositional sequences of the hyperpycnal flow.These can be summarized as gravelly bed to suspended load lithofacies association(GBS),gravelly reverse to normal compound-graded(GNR),coarse-grained sandy suspended load(CSS),and fine-grained sandy suspended load(FSS)lithofacies associations.The hyperpycnal system can be divided into four individual units:restricted channel,unrestricted channel,lobe,and levee.The reservoir quality varies with lithofacies.Gravelly bed load lithofacies has coarse grain sizes,high content of rigid minerals,and soluble components,such as magmatic rock fragments.Therefore,the gravelly bed load lithofacies reservoir has developed dissolution pores and well-preserved pore throats.Its reservoir quality is good.GBS and GNR are the main lithofacies associations in the restricted channel,where type Ⅰ and type Ⅱ reservoirs developed.The unrestricted channel is dominated by the CSS lithofacies association,with type Ⅲ reservoirs developed.The lobe is dominated by the CSS and FSS lithofacies associations,with type Ⅲ and type Ⅳ reservoirs developed.High-quality reservoirs mainly develop in the restricted and unrestricted channels,whereas reservoirs in the lobe have poor quality.The levees are dominated by siltstone and gray mudstone and are generally nonreservoirs.
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    Fracture Effectiveness and its Influence on Gas Productivity in Ultra-deep Tight Sandstone Reservoirs of the Keshen Gas Field,Tarim Basin

    XU XiaotongZENG LianboDONG ShaoqunDIWU Pengxiang...
    1557-1573页
    查看更多>>摘要：Fracture effectiveness plays a key role in gas productivity of ultra-deep tight sandstone reservoirs,Kuqa depression,Tarim Basin.Based on cores,thin sections,well logging,well testing and production data,the study evaluated fracture effectiveness and illustrated its impacts on gas productivity.High-angle and vertical shear fractures are the most important types.Distribution of effective fractures shows great heterogeneous.Fracture effectiveness is influenced by tectonism,diagenesis and in-situ stress.Earlier fractures or fractures in close to gypsum rock are easier to be filled.Completely filled fractures can be reopened under late tectonism.Dissolution improves local fracture effectiveness.Minerals spanning fracture surfaces protect fracture effectiveness from late compression.Fractures filled with calcite can be activated by acidification.Effective fractures parallel to maximum horizontal principal compressive stress direction show larger aperture.Overpressure can decrease the effective normal stress to maintain fracture effectiveness.With exploitation,decline in pore pressure reduces fracture effectiveness.Linear density,aperture,and strike of effective fractures influence gas productivity.Effective fractures greatly enhance matrix permeability.Therefore,more abundant and larger aperture fractures are always corresponded to higher productivity.However,effective fractures also facilitate late water invasion,especially,both mutually parallel.Intense water invasion leads to rapidly declines in productivity.
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