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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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    Tracking the Ti4+substitution in phlogopite by spectroscopic imaging:A tool for unravelling the growth of micas at HP-HT conditions

    G.Della VenturaN.El MoutaouakkilB.BoukiliS.Bernardini...
    1-13页
    查看更多>>摘要：Phlogopite solid-solutions have a wide pressure-temperature(P-T)stability field and are ubiquitous in a wide variety of geological settings,from deep lithosphere magmatic environments to upper crust meta-morphic domains.Phlogopite composition represents therefore a valuable physical-chemical archive and may provide important information regarding its crystallization and the petrogenesis of the host-rock.In this paper we examine the phlogopite phenocrysts from the well-known Fort Regent mica-bearing lam-prophyre minette from St.Helier(Island of Jersey,UK).Phlogopite phenocrystals from lamprophyres gen-erally show normal-step and continuous compositional zoning,however those from the Fort Regent minette show a peculiar texture characterized by dark brown high-Ti(average TiO2 ≈ 8.5 wt.％)cores enveloped by euhedral low-to mid-amplitude zonation due to oscillatory contents in Ti,Fe and Mg.Thermo-barometry modelling based on biotite-only composition yields relatively high P-T estimates(T≈ 970±54 ℃ at P ≈ 0.73±0.13 GPa)for cores whereas lower values(T ≈ 790±54 ℃ at P≈0.29±0.13 GPa)are obtained for the outer rims.Comparable temperatures(T ≈ 1075±54 ℃)but extre-mely high and anomalous pressure values(P≈ 1.82±0.13 GPa)are obtained for the yellowish inner rims.The combination of electron micro probe(EMP)analysis and single-crystal infra-red(FTIR)imaging in the OH-stretching region shows that the exceptional and oscillatory Ti contents are due to the Ti-vacancy substitution,typical of crystallization and growth processes of HP/HT environments.Raman imaging pro-vides additional insight for this process,confirming the dominant dioctahedral nature for the Ti-Fe-rich cores and outer rims.Interpretation of thermobaric estimates obtained from the phlogopite composition-only model,based on the fine-scale compositional evolution,shows that pressure-temperature values from low-Ti high-Mg domains should be carefully evaluated because the substitution mechanisms during the dark mica growth are not univocally related to pressure-temperature variation of the crystallizing environment.Our results demonstrate how a multidisciplinary approach based on the combination of chemical investigations and vibrational spectroscopies could represent a valuable tool to evaluate pres-sure-temperature estimates from biotite composition-only thermo-barometry models and therefore to correctly unravel HP/HT petrogenetic processes at a very fine scale.
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    Oil revenue and production cost disconnect and its impact on the environment:Economic globalization in Asia-Pacific economic cooperation countries

    Zhou LiSager Alharthi
    15-31页
    查看更多>>摘要：The global economy relies heavily on oil production,but it is not without challenges.During the period of economic globalization,the revenue and costs associated with oil production have become disjointed,which has had a detrimental effect on the environment.As a result,environmental protection has been compromised,environmental regulations have been weakened,natural resources have been exploited,and climate change has been exacerbated.This study examines the impact of revenue minus the produc-tion cost of oil,energy use,and shadow economy on environmental degradation in APEC countries from 1991 to 2020,using the economic globalization index as a moderating variable.The result explains that revenue minus the oil production cost and the shadow economy are negatively associated with environ-mental degradation.Energy use and economic globalization are positively associated with environmental degradation in APEC countries.Revenue minus the production cost of oil and shadow economy improve the environment.Energy use and economic globalization degrade the environment in APEC countries.Policymakers are encouraged to advance technologies and upgrade infrastructure to reduce greenhouse gas emissions;also,promoting energy-efficient practices in other sectors,like transportation and manu-facturing,could contribute to a healthier environment.
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    Depositional condition of Paleoproterozoic Francevillian carbonate rocks revisited from rare earth element contents

    Satoshi YoshidaKaren Bakakas MayikaYuki IshiharaMathieu Moussavou...
    33-51页
    查看更多>>摘要：The Paleoproterozoic Francevillian Group in the eastern Gabonese Republic has been recently attracting increasing attention because it includes distinctive macroscopic structures interpreted as eukaryotic fos-sils.Therefore,its depositional setting and associated redox conditions need to be clearly understood.To clarify these,petrological studies and rare earth element(REE)abundances of carbonate rocks of the Francevillian Group in the Lastoursville basin were determined with ICP-MS coupled with a laser ablation sampling technique.Detailed microscopic observations indicate that dolostones in this basin underwent the complicated diagenetic history,including sparitization,decomposition of organic matter,reduction of ferromanganese oxides,silicification,and later calcification.The dolostones of lower Francevillian B(FB)Formation show heterogeneous textures formed by alterations during diagenesis.By the alterations,changes of REE abundances and degrees of positive Y anomalies appear to have occurred.This indicates that REE signatures in carbonate rocks can vary during diagenesis.Characteristically high Mn contents in the dolostones of upper FB Formation were derived from the reduction of ferromanganese oxides in sed-iments.The signatures of REE abundance in dolostones can be explained by the mixing of seawater and ferromanganese oxide components.In that sense,the dolostones inherited the trace element character-istics of precursor ferromanganese oxides even after the diagenesis.Y/Ho values of the most primary parts of each sample exceed 33,the newly determined threshold value for marine carbonate rocks based on our compilation.The magnitude of the La anomaly values also falls within the range of that of Holocene reefal microbialites.These indicate that a precursor of the dolostone of the Francevillian Group was deposited in a marine environment.In addition,presence of Ce anomalies in the upper FB Formation suggests that the Paleoproterozoic ocean was oxidized to such an extent as for Ce to be pref-erentially absorbed by ferromanganese oxides.
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    Green trading and ecological sustainability under macroeconomic policy framework

    Yue HuBinhui LiMunir Ahmad
    53-69页
    查看更多>>摘要：When confronted with ecological challenges,trading ecologically friendly products involving renewable technologies,green management practices,and effluent treatment methods could alleviate ecological degradation on a global scale while considering the macroeconomic policy framework.Therefore,this study determines the effectiveness of fiscal and monetary policy instruments in moderating the relation-ship between green trade openness(i.e.,trade in environmentally related products)and ecological sus-tainability.Applying panel quantile regression on data from 20 OECD members from 2003 to 2016,we found that green trade openness supports ecological sustainability through a gains-from-trade approach.Concerning moderation effects,expenditure-driven fiscal expansion reinforces the favorable influence of green trade openness on ecological sustainability across ecologically less/moderately efficient economies,while it does the reverse for ecologically more efficient members.Taxation-driven fiscal contraction pro-motes ecological sustainability amelioration impact of green trade openness for economies with below-average ecological quality and remains neutral for those with average/above-average ecological quality.Besides,interest rate-driven monetary contraction proliferates the ecological sustainability enhancement effect of green openness.We suggest that the fiscal and monetary policies demand unambiguous coordi-nation with the OECD's trade policy structure for optimal environmental outcomes of trading in environ-mental products.These insights would help OECD's green trade policies gain momentum to facilitate the attainment of the Climate Action agenda of the United Nations'Sustainable Development Goals.
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    Flood susceptibility mapping using a novel integration of multi-temporal sentinel-1 data and eXtreme deep learning model

    Rami Al-RuzouqAbdallah ShanablehRatiranjan JenaMohammed Barakat A.Gibril...
    71-88页
    查看更多>>摘要：Flash floods(FFs)are amongst the most devastating hazards in arid regions in response to climate change and can cause the loss of agricultural land,human lives and infrastructure.One of the major challenges is the high-intensity rainfall events affecting low-lying areas that are vulnerable to FF.Several works in this field have been conducted using ensemble machine learning models and geohydrological models.However,the current advancement of eXtreme deep learning,which is named eXtreme deep factorisa-tion machine(xDeepFM),for FF susceptibility mapping(FSM)is lacking in the literature.The current study introduces a new model and employs a previously unapplied approach to enhance FSM for captur-ing the severity of floods.The proposed approach has three main objectives:(ⅰ)During-and after-flood effects are assessed through flood detection techniques using Sentinel-1 data.(ⅱ)Flood inventory is updated using remote sensing-based methods.The derived flood effects are implemented in the next step.(ⅲ)An FSM map is generated using an xDeepFM model.Therefore,this study aims to apply xDeepFM to estimate susceptible areas using 13 factors in the emirates of Fujairah,UAE.The performance metrics show a recall of 0.9488),an F1-score of 0.9107),precision of(0.8756)and an overall accuracy of 90.41％.The accuracy of the applied xDeepFM model is compared with that of traditional machine learn-ing models,specifically the deep neural network(78％),support vector machine(85.4％)and random for-est(88.75％).Random forest achieves high accuracy,which is due to its strong performance that depends on factors contribution,dataset size and quality,and available computational resources.Comparatively,the xDeepFM model works efficiently for complicated prediction problems having high non-collinearity and huge datasets.The obtained map denotes that the narrow basins,lowland coastal areas and riverbank areas up to 5 km(Fujairah)are highly prone to FF,whilst the alluvial plains in Al Dhaid and hilly regions in Fujairah show low probability.The coastal city areas are bounded by high-rise steep hills and the Gulf of Oman,which can elevate the water levels during heavy rainfall.Four major synchronised influencing factors,namely,rainfall,elevation,drainage density,distance from drainage and geomorphology,account for nearly 50％of the total factors contributing to a very high flood susceptibility.This study offers a plat-form for planners and decision makers to take timely actions on potential areas in mitigating the effects of FF.
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    Application of geophysical well logs in solving geologic issues:Past,present and future prospect

    Jin LaiYang SuLu XiaoFei Zhao...
    89-122页
    查看更多>>摘要：Geophysical well logs are widely used in geological fields,however,there are considerable incompatibil-ities existing in solving geological issues using well log data.This review critically fills the gaps between geology and geophysical well logs,as assessed from peer reviewed papers and from the authors'personal experiences,in the particular goal of solving geological issues using geophysical well logs.The origin and history of geophysical logging are summarized.Next follows a review of the state of knowledge for geo-physical well logs in terms of type of specifications,vertical resolution,depth of investigations and demonstrated applications.Then the current status and advances in applications of geophysical well logs in fields of structural geology,sedimentary geology and petroleum geology are discussed.Well logs are used in structural and sedimentary geology in terms of structure detection,in situ stress evaluation,sed-imentary characterization,sequence stratigraphy division and fracture prediction.Well logs can also be applied in petroleum geology fields of optimizing sweet spots for hydraulic fracturing in unconventional oil and gas resource.Geophysical well logs are extending their application in other fields of geosciences,and geological issues will be efficiently solved via well logs with the improvements of advanced well log suits.Further work is required in order to improve accuracy and diminish uncertainties by introducing artificial intelligence.This review provides a systematic and clear descriptions of the applications of geo-physical well log data along with examples of how the data is displayed and processed for solving geo-logic problems.
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    Convergent plate boundary environments for formation of ≥ 3800 Ma mafic-ultramafic assemblages(Isua area,Greenland):Implications for early global geodynamics

    Allen P.NutmanClark R.L.FriendVickie C.Bennett
    123-140页
    查看更多>>摘要：In the gneiss terrane on the south side of the Eoarchean Isua supracrustal belt,ultramafic rocks with relict abyssal peridotite mineralogy(Bennett et al.,2002;Friend et al.,2002;Nutman et al.,2007;Rollinson,2007;van de Löcht et al.,2020),layered gabbros with cumulate ultramafic rocks,basalts and associated siliceous sedimentary rocks were tectonically-imbricated,prior to and during intrusion of ca.3800 Ma tonalites.Together with ≥ 3800 Ma basalts in the Outer Arc Group of the nearby Isua supracrustal belt,the composition of all these mafic rocks(e.g.,Th-Hf-Nb systematics,high Th/Yb,Ba/Nb,Ba/Yb ratios and negative Nb and Ti anomalies)shows affinity with modern suprasubduction rocks whose genesis involved fluid fluxing of the upper mantle.However,the majority of these samples have Ba/Nb and Ba/Yb values less than in modern island arc magmas,but similar to many backarc basin magmas(e.g.,Pearce and Stern,2006).It is unknown whether these ca.3800 Ma mafic rocks are,(ⅰ)arc rocks where the Ba/Nb and Ba/Yb signatures reflect lower surficial Ba in Eoarchean oceanic settings,or(ⅱ)in direct comparison with Phanerozoic suites,these signatures reflect a back-arc setting with interplay between fluid fluxing and decompressional melting.The tectonic intercalation of upper mantle with lower and upper crustal rocks,combined with the fluid-fluxing influences seen in chemistry of all the mafic rocks is best accommodated in a compressional Eoarchean convergent plate boundary setting within a mobile-lid regime.Thus stagnant lid scenarios of crust formation,if operative,must have co-existed or alternated with mobile-lid regimes by 3800 Ma.
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    Investigating low dispersion isotope dissolution Lu-Hf garnet dates via in situ Lu-Hf geochronology,Kanchenjunga Himal

    Kyle P.LarsonJohn M.CottleMark ButtonBrendan Dyck...
    141-149页
    查看更多>>摘要：Re-examination of three specimens from the Kanchenjunga Himal of Nepal via in situ Lu-Hf garnet geochronology yields evidence of multiple garnet growth events.Spot analyses from grain cores in two specimens define Paleozoic regressions whereas analyses from grain rims in the same specimens define low-precision regressions consistent with the timing of Himalayan orogenesis.These dates contrast with previously published low dispersion,ca.290 Ma isotope dissolution(ID)Lu-Hf garnet dates for the same rocks.Modelling of Lu and spot age distribution in representative grains from the specimens examined yields calculated dates that approximate the Permian-age regressions through the original ID data.These findings demonstrate that it is possible to generate low dispersion ID Lu-Hf data from multi-generational garnet with significantly different-age growth events when approximately equal propor-tions of the different age reservoirs are included in multi-component aliquots.
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    The gold-telluride connection:Evidence for multiple fluid pulses in the Jinqingding telluride-rich gold deposit of Jiaodong Peninsula,Eastern China

    Wenyan CaiMingchun SongM.SantoshJian Li...
    151-170页
    查看更多>>摘要：The mechanism of gold migration,enrichment,and precipitation in forming world-class gold deposits has been a topic of wide interest,particularly where these deposits are abundant in tellurides.The Jiaodong Peninsula in eastern China hosts some of the world-class gold deposits among which the Jinqingding deposit is one of the best examples with substantial telluride mineralization and thus provides opportu-nity to investigate the genetic connection between tellurium and gold mineralization.The orebody in this deposit is hosted in the NE-NNE-trending Jiangjunshi-Quhezhuang fault with the Jurassic Kunyushan granitic pluton as wall rock.The deposit involved three mineralization stages as inferred from assem-blages and crosscutting relationships between veins.These stages are:(Ⅰ)pre-ore gold-poor quartz-pyrite veins,(Ⅱ)main ore auriferous quartz-pyrite-Te/Bi-minerals±sphalerite±chalcopyrite±barite±marc asite veins,and(Ⅲ)post-ore quartz-calcite veins.We present here the textural,isotopic,and geochemical variations of different stages/generations of pyrite based on scanning electron microscopy-energy disper-sive spectroscopy(SEM-EDS),electron probe microanalysis(EPMA),and laser ablation inductively cou-pled plasma mass spectrometry(LA-ICP-MS).Pyrite in the Jinqingding deposit displays distinct characteristics.Py1a shows a porous and dissolution-reprecipitation texture in the core,whereas Py1b exhibits a smooth and flat rim.Geochemical analysis reveals contrasting elemental compositions,with Py1a characterized by low Au(avg.0.14 ppm),As(avg.15.57 ppm),Ag(avg.17.71 ppm),and Te(avg.19.22 ppm)contents,but elevated Co(avg.1068.10 ppm)and Ni(224.12 ppm)concentrations,and variable sulfur isotopic composition(δ34SV-CDT=9.54‰-12.12‰).Conversely,Py1b displays increased concentrations of these elements and a more concentrated δ34SV-CDT value(11.99‰-12.23‰),possibly associated with weak coupled dissolution-reprecipitation(CDR)processes.In Stage Ⅱ,pyrite can be further categorized into two generations:the porous core(Py2a)and the smooth periphery(Py2b).Notably,Stage Ⅱ exhibits increased contents of Au(Py2a:avg.0.47 ppm;Py2b:avg.5.57 ppm),As(Py2a:avg.1265.20 ppm;Py2b:1049.46 ppm),Ag(Py2a:avg.5.43 ppm;Py2b:avg.65.23),and Te(Py2a:avg.21.47 ppm;Py2b:avg.51.66 ppm),δ34SV-CDT value exhibits minor changes(Py2a:11.48‰-1 3.05‰;Py2b:11.79‰-12.80‰).These changes poten-tially indicate the involvement of a fluid pulse characterized by low fO2:-34.9 to-30.2,medium fTe2:-14.7 to-10.9 and fS2:-11.4 to-6.9.Despite the dissolution-reprecipitation textures present in the ores,gold did not undergo remobilization,except for a possible weak contribution in Stage Ⅱ.The pres-ence of abundant Bi/Te-minerals underscores the significant role of low-melting point chalcophile ele-ments in gold migration and enrichment.By compiling and analyzing sulfur isotopic composition of gold deposits across the entire Jiaodong Peninsula,which shows the reduction of marine sulfates as a cru-cial mechanism for sulfur enrichment.We conclude that the Jinqingding gold deposit,characterized by abundant tellurium,along with episodic pulses of ore-forming fluids,and exhibit subtle distinctions com-pared to other gold deposits within the Jiaodong Peninsula.
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    A late Carboniferous transition from subduction to collision:Tectono-sedimentary evidence from southern Junggar,NW China

    Shuoqin HouDi LiDengfa HeYu Lu...
    171-184页
    查看更多>>摘要：The Carboniferous to Permian tectono-sedimentary evolution of the southern Junggar area brings new insights into understanding the subduction-collision processes in the northern Tianshan region.Integrating geophysics,geochemistry,and geochronology approaches,this study investigates the Carboniferous-Permian strata in the southern Junggar Basin.The results have revealed three distinct tectono-stratigraphic evolutionary stages,each marked by a distinctive volcano-sedimentary sequence.The Early Carboniferous strata suggest intense volcanic activities in the southern Junggar area.During the Late Carboniferous,the southern Junggar Basin was controlled by normal faulting in an extensional setting,receiving sedimentary inputs from the Junggar terrane.The Lower Permian,unconformably over-lying the Upper Carboniferous,was shaped by an extensional regime and is comprised by volcano-clastic sequences that received detritus from the Yili-Central Tianshan block.These findings indicate that a Late Carboniferous forearc basin developed in the southern Junggar area,and it evolved into a post-collisional rift in the Early Permian.This period marked a dynamic shift from bidirectional subduction(rollback)to the detachment of the North Tianshan oceanic slab.We propose that the collision between the Yili-Central Tianshan block and the Junggar terrane,along with the closure of the North Tianshan Ocean,likely occurred in the Late Carboniferous(ca.306-303 Ma).
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