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地学前缘(英文版)
地学前缘(英文版)

莫宣学

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1674-9871

geofrontier@cugb.edu.cn

010-82322283,82321855

100083

北京市海淀区学院路29号中国地质大学（北京）期刊中心

地学前缘(英文版)/Journal GEOSCIENCE FRONTIERSCSCDCSTPCD北大核心SCI
查看更多>>GEOSCIENCE FRONTIERS (GSF) is a quarterly journal that publishes in English significant original research articles and high quality reviews of recent advances in all fields of Earth Sciences — including stratigraphy and paleontology, mineralogy and petrology, economic geology and minerals and fuel exploration, structural geology, lithospheric tectonics, environmental and engineering geology, hydrogeology, astrogeology, marine geology, and geophysics and geochemistry. Technical papers, case histories, reviews, and discussions are welcomed.
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    Cretaceous magmatic arc in Hainan and the peri-South China Sea as evidenced by geochemical fingerprinting of granitoids in the region

    Xiao-Yan JiangYildirim DilekXian-Hua Li
    363-379页
    查看更多>>摘要：Mesozoic magmatic rocks occur widely in the South China Block and are generally interpreted as the manifestations of the subduction of the Paleo-Pacific oceanic lithosphere beneath Asia.Subduction-driven magmatism in southeast(SE)China continued from the Late Permian through the Late Cretaceous with an inferred lull between 125 Ma and 115 Ma that is known in the literature as the Cretaceous"magmatic quiescence".We report in-situ zircon U-Pb ages,Hf-O and whole-rock Sr-Nd iso-topes,and whole-rock geochemistry of Cretaceous granitoids on Hainan Island and discuss their mag-matic evolution within the framework of the Late Mesozoic geodynamics of SE China.We recognize two main stages of the emplacement of Cretaceous granitoids on Hainan,first around 120 Ma and then around 100-95 Ma,displaying high-K calc-alkaline,Ⅰ-type geochemical affinities.Granites in both age groups are enriched in LILE and LREE,but depleted in Nb,Ta,Ba,Sr,and Eu.The 120 Ma granites have zircon εHf(t)values of-2.6 to 2.3 corresponding to Hf crustal model ages,ranging from 0.79 Ga to 1.03 Ga,and δ18O values ranging from 6.9‰ to 7.7‰.Zircons from 100-95 Ma granites have εHf(t)values of-4.2 to 1.1 corresponding to Hf crustal model ages of 1.08 Ga to 1.42 Ga,and δ18O values ranging from 6.7‰ to 8.4‰.Increasing εHf(t)values of the Cretaceous Hainan granites with younger crystallization ages indicate addition of more juvenile components and reworking of crustal material into their melt evolu-tion.The εNd(t)values of the 120 Ma and 100-95 Ma granitoids range between-4.1 to-0.4 and-7.7 to-4.0,respectively.The calculated two-stage model age of the 100-95 Ma granitoids clusters between 1.25 Ga and 1.53 Ga.These isotopic data suggest that magmas of the Cretaceous granitoids were pro-duced by partial melting of Mesoproterozoic metabasaltic rocks,which make up much of the crystalline basement of the southern Cathaysia block.The geochemical and isotopic characteristics of the Cretaceous granitoids on Hainan resemble those of magmatic arcs in the Circum-Pacific orogenic belts and identical to those of nearly coeval granitoid intrusions in the continental fragments within the South China Sea basin.We interpret these Cretaceous granitoids in the Peri-South China Sea region as the remnants of a once contiguous Late Mesozoic magmatic arc system that bounded the southern margin of the entire continental Southeast Asia.Our findings do not support the existence of an episode of magmatic quies-cence in the geological record of SE China during the Aptian.
      原文链接:
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    Geochronological and genetic characterization of basaltic basement from western offshore basins in India

    Piyush GuptaShakti Singh RathoreSandeep Singh
    381-407页
    查看更多>>摘要：40Ar-39 Ar geochronology,geochemistry,and Sr-Nd isotopic compositions of 30 core samples from 24 off-shore drill wells in the Western offshore basins have been used to characterize the genetics of the vol-canic basement from the Kutch,Mumbai,and Kerala-Konkan offshore basins.Findings from the volcanic basement rocks demonstrate extremely varied isotopic and geochemical fingerprints,which are suggestive of significantly diverse parent magma compositions and emplacement processes.Basaltic tholeiitic basement from Kutch Offshore basin has Ar-Ar ages that range between 60 Ma and 62 Ma.This basement is characterised by a within-plate basalt signature,with depleted isotopic signa-tures similar to least contaminated Deccan Traps basalts,and a component of subducted crustal material.Basaltic basement from Mumbai Offshore Basin has eruption ages between 63 Ma and 65 Ma and show a strong within-plate OIB affinity.Geochemical and isotopic signatures are consistent with Renuion lavas and an enriched-end member of Deccan Traps basalts.However,Kerala-Konkan Offshore Basin shows significant E-MORB affinity and is characterized by primitive-mantle signatures and least contamination from the upper continental crust,with ages of eruption between 60 Ma and 61 Ma based on obtained 40Ar-39Ar ages.The study suggests that the Mumbai Offshore Basalts'mode of the eruption was comparable with onshore Deccan volcanism,whereas the basaltic basement in Kutch Offshore was formed after the main phase of Deccan eruption and may have been an offshoot of a"tail"of the main Deccan volcanism.The parent magma for the volcanic E-MORB basement in the Kerala-Konkan Offshore Basin is thought to have come from mixing along the Carlsberg Mid-Oceanic Ridge and the material from the Reunion plume with the northward movement of the Indian Plate during the Early Paleocene.This is thought to have occurred concurrently with the formation of the Chagos-Laccadive Ridge.
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    Incorporating mitigation strategies in machine learning for landslide susceptibility prediction

    Hai-Min LyuZhen-Yu YinPierre-Yves HicherFarid Laouafa...
    409-424页
    查看更多>>摘要：This study proposes an approach that considers mitigation strategies in predicting landslide susceptibil-ity through machine learning(ML)and geographic information system(GIS)techniques.ML models,such as random forest(RF),logistic regression(LR),and support vector classification(SVC)are incorporated into GIS to predict landslide susceptibilities in Hong Kong.To consider the effect of mitigation strategies on landslide susceptibility,non-landslide samples were produced in the upgraded area and added to ran-domly created samples to serve as ML models in training datasets.Two scenarios were created to com-pare and demonstrate the efficiency of the proposed approach;Scenario Ⅰ does not considering landslide control while Scenario Ⅱ considers mitigation strategies for landslide control.The largest landslide sus-ceptibilities are 0.967(from RF),followed by 0.936(from LR)and 0.902(from SVC)in Scenario Ⅱ;in Scenario Ⅰ,they are 0.986(from RF),0.955(from LR)and 0.947(from SVC).This proves that the ML mod-els considering mitigation strategies can decrease the current landslide susceptibilities.The comparison between the different ML models shows that RF performed better than LR and SVC,and provides the best prediction of the spatial distribution of landslide susceptibilities.
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    Telluric iron assemblages as a source of prebiotic phosphorus on the early Earth:Insights from Disko Island,Greenland

    Oleg S.VereshchaginMaya O.KhmelnitskayaLarisa V.KamaevaNatalia S.Vlasenko...
    425-439页
    查看更多>>摘要：Phosphorus is one of the key elements,which determined the emergence of primordial life on our planet.The source of prebiotic phosphorus was most likely to be easily soluble compounds containing phospho-rus in the negative form of oxidation(e.g.,phosphides).The present paper is the first thorough investi-gation of phosphide-bearing mineral assemblages confined to telluric(terrestrial)native iron from volcanic rocks of Disko Island,Greenland.Phosphorus speciation in given assemblages varies from the solid solution in native iron(up to 0.3 wt.％P),different phosphides-schreibersite Fe3P,nickelphosphide Ni3P,barringerite Fe2P,and phosphates,including fluorapatite,anhydrous Fe-Na phosphates,phosphoran olivine and pyroxene(up to 1 wt.％P).The diversity of observed phosphorus speciation can be explained by the steep changes of redox conditions during subsurface crystallization of iron-phosphide-bearing lavas.Based on the available data on likely redox conditions on the early Earth,we hypothesize that reac-tive prebiotic phosphorus may have originated from shallow crustal rocks.
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    Energy access challenge and the role of fossil fuels in meeting electricity demand:Promoting renewable energy capacity for sustainable development

    Jinjun Zhang
    441-454页
    查看更多>>摘要：The energy access challenge remains a significant barrier to sustainable development,with millions of people still needing access to modern energy services.Fossil fuels have played a crucial role in meeting electricity demand,but they face challenges and drawbacks in terms of environmental sustainability,energy security,and climate change.This study examines how renewable and non-renewable energy generation capacity impacted the environment in 53 upper-middle-income countries from 1990 to 2020,using energy access and alternative energy sources as mediating variables.The findings of this study provide valuable insights into the complex relationship between renewable energy generation capacity,energy access,alternative energy sources,and environmental conditions in upper-middle-income countries.The positive relationship between renewable energy generation capacity and environ-mental conditions emphasizes the importance and potential of renewable energy sources in mitigating environmental degradation.Additionally,the findings indicate that energy access also plays a crucial role in shaping energy generation patterns,with higher levels of access being associated with increased renewable energy generation and decreased reliance on non-renewable energy sources.These findings highlight the urgent need for policies and measures to promote renewable energy adoption and prioritize energy access to mitigate environmental degradation and achieve sustainable development goals.
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    U-Pb dating of bastn?site from the Vuoriyarvi massif:An example application for assessing the REE potential of carbonatite-related deposits

    Evgeniy N.KozlovEkaterina N.FominaQiuli LiJiao Li...
    455-464页
    查看更多>>摘要：The Vuoriyarvi massif is a Devonian multistage alkaline-ultrabasic carbonatite complex within the Kola alkaline province.Dolomite carbonatites of the Vuoriyarvi massif contain abundant rare-earth mineral-ization mainly represented by ancylite-(Ce)and bastnäsite-(Ce).Ancylite was previously shown to have probably formed in the Devonian(ca.365 Ma)during an early postmagmatic overprint.Previous geolog-ical observations have revealed a much later crystallization of bastnäsite but have not been able to spec-ify the exact age of the mineralization.The in situ U-Pb dating of bastnäsite allowed us to constrain its genesis.Bastnäsite for this study was extracted from two varieties of dolomite carbonatite breccias cemented by(1)quartz-bastnäsite and(2)strontianite aggregates(hereafter bastnäsite-rich and strontianite-rich carbonatites-BRC and SRC,respectively).The obtained age estimations(237.7±9.8 Ma and 239.9±4.1 Ma,respectively)indicate that both studied rocks were formed during a single event.The revealed age difference(～125 Ma)excludes the genetic link between the bastnäsite origin and regio-nal alkaline magmatism,pointing out an additional source for the Vuoriyarvi bastnäsite-bearing rocks.Moreover,the obtained U-Pb ages provide strong evidence that a Triassic event is responsible for the occurrence of bastnäsite mineralization due to hydrothermal REE redistribution from the Devonian ancylite-rich carbonatites.Most of the REEs released during this process via dissolution of ancylite were precipitated in situ as bastnäsite,while strontium was transported and incorporated into strontianite.The Pb isotopic characteristics of bastnäsite(206Pb/204Pb=18.1±0.1,207Pb/204Pb=15.3±0.1,and 207Pb/206Pb=0.84±0.01)are most probably inherited from the Devonian host rocks of the Vuoriyarvi massif involved in the Triassic overprint.Isotopic signatures of Pb,Sr,and Nd show that the depleted mantle and lower crust played the leading role in formation of the Vuoriyarvi alkaline complex.Taken together,the results of the present study negate the supergene origin of the Vuoriyarvi bastnäsite,imply-ing that the bastnäsite mineralization is not confined to near-surface layers and,therefore,may be dis-persed more broadly throughout the complex.These findings raise the question on underestimation of the probable REE reserves and lay the groundwork for a reassessment of the economic potential of the Vuoriyarvi complex.
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    Does environmental policy stringency alter the natural resources-emissions nexus?Evidence from G-7 countries

    Roni BhowmikArshian SharifAhsan AnwarQasim Raza Syed...
    465-477页
    查看更多>>摘要：Natural resource management is indispensable keeping in view their positive economic impacts as well as their detrimental environmental consequences.To achieve certain SDGs,it is inevitable to manage nat-ural resources through effective policies that help to inhibit adverse environmental impacts.Based on this approach,the current empirical analysis aims to probe whether environmental policy stringency intensifies,meagres,and/or halts the abysmal environmental impact of natural resources in G-7 countries(United Kingdom,United States,Canada,Italy,France,Japan,and Germany)for the period from 1990 to 2020.To that end,we rely on the second-generation panel data approaches and panel quantile regression.The outcomes reveal that natural resources increase carbon dioxide emission whereas the synergy of nat-ural resources and environmental policy stringency plunges emissions across the quantiles.These find-ings suggest adoption of a strict environmental policy for attaining the targets of SGD-08(economic growth),SDG-09(innovations),SDG-11(sustainable cities),SDG-12(responsible consumption of natural resources),and SDG-13(climate action).
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    Large dinosaur egg accumulations and their significance for understanding nesting behaviour

    L.EzquerroR.CoimbraB.BauluzC.Núñez-Lahuerta...
    479-500页
    查看更多>>摘要：The accurate identification of dinosaur egg accumulations as nests or clutches is crucial for understanding the reproductive behaviour of these extinct species.However,existing methods often rely on the pres-ence of complete eggs and embryo remains,and sedimentological criteria that are only applicable to well-structured sediments.In this study,we introduce an innovative approach to characterize egg accu-mulations in structureless sediments,where traditional nest structures may not be preserved.Our methodology employs a unique combination of sedimentological,taphonomic,geochemical,and geo-physical proxies for the study of egg accumulations.We applied this approach to the egg accumulation from Paimogo(Jurassic,Portugal),traditionally interpreted as a nest.Our findings reveal that the Paimogo egg assemblage is a secondary deposit,resulting from a flooding event in a fluvial plain that dis-mantled several allosauroid and crocodylomorph clutches.The eggshell vapor conductance results,cou-pled with sedimentological evidence,suggest that allosauroid dinosaurs buried their eggs in the dry terrain of overbank areas close to a main channel during the breeding season,likely during the dry season to prevent the embryos from drowning.This research underscores the necessity of multidisciplinary approaches in interpreting egg accumulations and offers a novel methodology for studying these accu-mulations in structureless sediments.Our findings provide new insights into the breeding behaviour and nesting preferences of these extinct organisms,contributing to our understanding of dinosaur ecology.
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    Geology and genesis of the Aqishan Pb-Zn deposit,NW China:Insights from mineralogy,geochemistry,and in situ U-Pb geochronology

    Kang WangYinhong WangJun DengJiajun Liu...
    501-526页
    查看更多>>摘要：The unique ore-forming processes and the key factors responsible for formation of skarn deposits are still obscure,and challenges exist in the determination of timing of Pb-Zn skarns owing to lacking suitable mineral chronometers.Here we present detailed paragenesis,bulk geochemistry,in situ U-Pb dating of zircon and garnet,and garnet oxygen isotopes together with in situ zircon Hf-O isotopes from the newly discovered Aqishan Pb-Zn deposit in the southern Central Asian Orogenic Belt(CAOB),northwest China.This comprehensive data set revealed a Late Carboniferous subduction-related distal Pb-Zn skarn system associated with the granitic magmatism.Pre-ore stage garnets are generally subhedral to euhedral with oscillatory zoning and show slightly fractionated rare earth element patterns with positive Eu anomalies that point to an infiltration metasomatism origin under high water/rock ratios.The syn-ore stage spha-lerite is typically enriched in Mn and Cd and has moderate Zn/Cd ratios(337-482),with a formation tem-perature of 265 ℃ to 383 ℃,which indicate magmatic-hydrothermal signatures.The isocons defined by P2O5 decipher that the principal factors for skarn formation were elevated activities of Fe,Ca,and Si spe-cies,where remobilization of Pb metals,meanwhile,contributed to ore-forming budgets to mineralizing fluids.SIMS U-Pb dating of zircons from granite porphyry that occurs distal to the skarns and Pb-Zn ore-bodies shows that these intrusions emplaced at ca.311.3-310.6 Ma,recording the subduction of the Paleo-Tianshan oceanic plate.Hydrothermal garnets in close textural association with Pb-Zn sulfides yield indistinguishable in situ LA-ICP-MS U-Pb ages of 310.5±4.1 Ma.Whole-rock geochemistry and in situ zircon Hf-O isotopes(δ18O=4.6‰-6.0‰)indicate that the granite porphyry was derived from par-tial melting of juvenile crust and influenced by subducted oceanic crust.Oxygen isotope compositions of garnets(δ18O=8.0‰-9.0‰)demonstrate that the equilibrated ore fluids were inherited from fluid-rock interactions between a primary magmatic water and host tuff rocks.Our study highlights the application of garnets as a potential robust U-Pb geochronometer and isotopic tracer of ore fluids in skarn mineral-izing systems in subduction-related arc environments.
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    Contribution of hydro energy production,economic complexity and technological innovation in achieving an environmentally sustainable Asia

    Farah RanaBilal HussainAbdelmohsen A.NassaniAyesha Hussain...
    527-540页
    查看更多>>摘要：The impact of hydro energy production,economic complexity,urbanization,technological innovation and financial development on environmental sustainability between 1995 and 2017 is examined for a panel of thirteen Asian economies using two environmental proxies-their ecological footprint and CO2 emissions.The non-parametric Driscoll-Kraay standard error method and the Dumitrescu-Hurlin panel causality test are applied to the data.Our findings show that hydro energy production and technological innovation have a significant negative impact on the environment,thus promoting environmental sustainability.Economic complexity significantly lowers environmental sustainability while the non-linear effect of economic com-plexity favors environmental sustainability;this confirms the existence of an economic-complexity-based inverted-U-shaped environmental Kuznets curve hypothesis.Moreover,urbanization and financial develop-ment significantly decrease environmental sustainability.The results of our study confirm the feedback causality between hydro energy production and carbon dioxide emissions.We recommend expansionary policies regarding hydro energy production that are beneficial for substituting fossil fuel energy.This paves a path towards environmental sustainability in this era of global boiling.
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