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地球科学学刊（英文版）
地球科学学刊（英文版）

王亨君

双月刊

1674-487X

ejournal@cug.edu.cn

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430074

武汉市洪山区鲁磨路388号

地球科学学刊（英文版）/Journal Journal of Earth ScienceCSCDCSTPCD北大核心SCI
查看更多>>本刊是教育部主管、中国地质大学主办的综合性地球科学学术理论刊物，是中国自然科学核心期刊，以反映我国地球科学领域最新的高水平的基础地质、应用地质、资源与环境地质及地学工程技术科研成果为主要任务，以促进国内外地学学术交流，繁荣我国地质教育、地质科技与地质找矿事业，为我国社会主义现代化建设服务为目的。读者对象为从事地质教育和科研工作的研究者以及大学生和研究生。
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    Early Triassic Legoupil Formation in Schmidt Peninsula,Antarctic Peninsula:Provenance and Depositional Settings

    Chao ZhangYing-Chun CuiChen-Guang LiuFang-Hua Cui...
    317-331页
    查看更多>>摘要：Geochemical compositions can be used to determine the tectonic setting of sedimentary basins,while where the link of source to sink is no longer preserved,detrital zircon age patterns can aid in resolving the original basin setting.The metasedimentary Legoupil Formation,located at Cape Legoupil and the Schmidt Peninsula,could give a hint for the tectonic evolution of Antarctic Peninsula.In this contribution,we constrain the sedimentary provenance of the Legoupil Formation through geo-chemistry and detrital zircon U-Pb geochronology.The petrography and geochemical features indicate that the provenance of the Legoupil Formation could be felsic rocks.Detrital zircon grains record a steady supply of Permian and Ordovician material into the Legoupil Formation.The youngest concor-dant zircon ages of 262 Ma suggest that the depositional time of Legoupil Formation is no older than Late Permian.The detrital zircon age spectrum of Legoupil Formation suggests that the Legoupil For-mation sediments should be derived from regional sources endemic to western Gondwana prior to its breakup.Together with the previous studies,geochemistry and detrital zircons reflect an active conti-nental margin tectonic setting and the detrital zircon spectra of Legoupil Formation are similar to the ones deposited in forearc tectonic setting.
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    Depositional and Bio-Sequence Stratigraphic Framework of Late Cretaceous Kawagarh Formation,Kala-Chitta Range,Pakistan:Equivalent of Gurpi Formation(Iran)

    Muhammad AwaisBilal WadoodMuhammad IshaqMuhammad Bilal...
    332-348页
    查看更多>>摘要：The present study is focused on evaluation of deep marine pelagic sediments of Late Cre-taceous Kawagarh Formation of Kala-Chitta Range in the context of microfacies analysis,paleoenvi-ronmental interpretation,planktonic foraminiferal biostratigraphy,sequence stratigraphy and diversi-fication of species.A total of thirty three rock samples were collected from the measured section.Three microfacies are interpreted,namely planktonic foraminifera wackestone,planktonic foraminifera mud-stone and sandy mudstone indicating low energy depositional environment i.e.,outer ramp.The bio-stratigraphic studies show plentiful planktonic foraminifera species of Globotruncana,Heterohelix and Globotruncanita.However,no association of benthic or siliceous organisms was observed.On the basis of available species assemblage,a single local planktonic foraminifera biozone i.e.,Globotruncana-Heterohelix-Globotruncanita Assemblage Biozone is established.The biozone information is combined with published literature and Lower Santonian to Middle Maastrichtian age has been assigned to the Kawagarh Formation.The trend of species occurrences evinces that species number decreases over time with pulsated rise in the Kawagarh Formation.The Kawagarh Formation carbonates show an overall Transgressive Systems Tract(TST).The Kawagarh Formation of Pakistan evinces analogous characteristics to that of the Late Cretaceous Gurpi Formation of Iran based on the geologic age,out-crop lithology,microfacies,planktonic foraminiferal assemblages,depositional setting and sequence stratigraphy.
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    Multi-Elemental Chemostratigraphy,Sequence Development,Depositional History,and Environmental Importance of Early Eocene Red Beds(Kuldana Formation)in NW Himalayas,Pakistan

    Amir ShahzadGeorge KontakiotisThierry AdatteKhawaja Shoaib Ahmed...
    349-375页
    查看更多>>摘要：The Eocene Kuldana Formation(KF)in the Yadgar area of Pakistan,comprises a di-verse range of sedimentary facies,including variegated red beds of shales,mudstones,and sandstones,as well as interbedded limestone and marl.In this study,we conducted an integrated micropaleontologi-cal,sedimentological,mineralogical,and geochemical investigation to determine the depositional set-ting,biochronology,provenance,and paleoclimate of the KF.The study identified six lithofacies and six microfacies,which indicate a variety of environments ranging from floodplains and channels to the margins and shallow marine settings.The nannofossil biostratigraphy places the KF in the Early Eo-cene,more precisely the NP10 zone(Ypresian),and the fossil zone of benthic foraminifera classifies the study section as the Shallow Benthic Zone SBZ-8(Middle Ilerdian 2).In terms of petrography,the KF sandstone was classified as litharenite and feldspathic litharenite,while the QtFL diagram suggests a recycled orogen.Geochemical proxies indicate an oxidizing environment,a high-to-low regular sedi-mentation rate,moderate-to-intense chemical weathering in the source region,and a warm-humid to dry climate during the deposition of KF.Overall,the findings suggest that the deposition of KF marks the end of Neo-Tethys due to the Early Eocene Indian-Kohistan collision and that the uplifting of the Himalayas provided the source for the deposition of KF in the foreland basin.The study provides new insights into the depositional environment,biochronology,provenance,and paleoclimate of KF,and highlights the potential for red beds as reliable indicators of oxygenation levels in proximity to mineral deposits.
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    Structural Geology and Chronology of Shear Zones along the Shangdan Suture in Qinling Orogenic Belt,China:Implications for Late Mesozoic Intra-Continental Deformation of East Asia

    Falak SheirWei LiLe ZhangBasil Alabowsh...
    376-393页
    查看更多>>摘要：The Shangdan suture zone(SDZ)in the Qinling orogenic belt(QOB)is a key to under-standing the East Asia tectonic evolution.The SDZ gives information about convergent processes be-tween the North China Block(NCB)and South China Block(SCB).In the Late Mesozoic,several shear zones evolved along the SDZ boundary that helps us comprehend the collisional deformation between the NCB and SCB,which was neglected in previous studies.These shear zones play an essential role in the tectonic evolution of the East Asia continents.This study focuses on the deformation and geochro-nology of two shear zones distributed along the SDZ,identified in the Shaliangzi and Maanqiao areas.The shear sense indicators and kinematic vorticity numbers(0.54-0.90)suggest these shear zones have sinistral shear and sub-simple shear deformation kinematics.The quartz's dynamic recrystallization and c-axis fabric analysis in the Maanqiao shear zone(MSZ)revealed that the MSZ experienced defor-mation under green-schist facies conditions at ∼400-500 ℃The Shaliangzi shear zone deformed under amphibolite facies at～500-700℃.The 40Ar/39Ar(muscovite-biotite)dating of samples provided a pla-teau age of 121-123 Ma.Together with previously published data,our results concluded that QOB was dominated by compressional tectonics during the Late Early Cretaceous.Moreover,we suggested that the Siberian Block moved back to the south and Lhasa-Qiantang-Indochina Block to the north,which promoted intra-continental compressional tectonics.
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    Latest Carboniferous-Early Permian Rifting of the Northern Gondwanan Margin and the Opening of the Northern Neotethys:New Evidence from the Carboniferous and Permian Foraminiferal Assemblages from the Bey?ehir-Hoyran Nappes,Central Taurides(Southern Turkey

    Cengiz OkuyucuU.Kagan TekinCagri GuzgunKaan Sayit...
    394-415页
    查看更多>>摘要：The Beyşehir-Hoyran Nappes,one of the tectonostratigraphic units of the Taurides,are thought to be originated from the Izmir-Ankara Ocean(northern branch of Neotethys).In this study,Late Paleozoic rock units from the blocks of Beyşehir-Hoyran Nappes were studied in detail using fora-miniferal assemblages in two different locations from the southwest of Karaman City(southern Tur-key).In both places,blocks/slices and pebbles of various origins are embedded within a highly sheared matrix of Late Cretaceous Age,and the whole unit can be regarded as a sedimentary mélange.The ages of the blocks from the southwest of Karaman City range from the Late Serpukhovian(Late Mississippi-an)to Late Capitanian(Middle Permian)with some depositional breaks(e.g.,Bashkirian,Kasimovian).Combined with the previous data from the Mersin Mélange,which also include the remnants of the Beyşehir-Hoyran Nappes,our new findings suggest that a shallowing-upward sequence,characterized by a shallow water environment with foraminifera-bearing limestones,was deposited over the Tournai-sian pelagic sequence in the Beyşehir-Hoyran Nappes till the Early Moscovian(Early Middle Pennsylva-nian).This shallowing-upward sequence in the Beyşehir-Hoyran Nappes could be related to the Late Pa-leozoic Glaciation on the Gondwana supercontinent(Glacial Ⅱ),which resulted in a sea-level drop and deposition of platform carbonates during the Viséan-Early Moscovian(Middle Mississippian to Early Middle Pennsylvanian)time interval.The absence of the main part of the Middle-Upper Pennsylvanian deposits(continental phase during the Middle Moscovian-Middle Gzhelian)in the Beyşehir-Hoyran Nappes can be mainly attributed to the occurrence of a mantle plume and partially to the effect of Late Paleozoic Gondwanan Glaciation(Glacial Ⅲ).Progressive uplifting by the buoyant mantle plume mate-rial has resulted in rifting at the center of the basin where the Beyşehir-Hoyran Nappes have deposited.The rifting process led to tectonic destabilization of the platform in the basin,causing accumulation of the Upper Gzhelian(uppermost Pennsylvanian)detrital limestone with broken and abraded foraminif-eral shells.Following this,deep basinal conditions prevailed during the Late Asselian-Kungurian(Early Permian),as revealed in the Mersin Mélange,where radiolarian cherts are associated with continental within-plate lavas of extreme incompatible trace element enrichment.Similar processes were responsi-ble for the continual deposition of detrital limestones in the same basin until the end of Late Capitanian(Middle Permian).Based on all these,the uplifting process followed by rift-related volcanic rocks and detrital limestones can be interpreted as the opening of the Izmir-Ankara Ocean(northern Neotethys).
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    Petrogenesis and Tectonic Implications of the Paleoproterozoic A-Type Granites in the Xiong'ershan Area along the Southern Margin of the North China Craton

    Jinhong XuYuping JiangShuli HuZhengwei Zhang...
    416-429页
    查看更多>>摘要：Paleoproterozoic A-type granites are widely distributed in the southern margin of the North China Craton(SNCC),providing important information for understanding the Paleoproterozoic tectonic regimes in this area.This paper reports newly obtained whole-rock compositions and zircon U-Pb ages for the Tieluping syenogranite porphyry(TLP)and Huoshenmiao alkali granite porphyry(HSM)in the SNCC.Zircons from the TLP and HSM have U-Pb ages of 1805±12 and 1792±14 Ma,respectively.These ages are taken to date the emplacement of these intrusions.They had high total al-kali contents(K2O + Na2O>7.13 wt.%),with high 10000×Ga/Al ratios(3.06-3.41)and Zr + Y + Nb + Ce values(709 ppm-910 ppm)as well as high zircon saturation temperatures(864-970℃),indicative of A-type granite affinities.High Y/Nb(1.75-3.32),Ce/Nb(7.72-9.72),and Yb/Ta(2.89-5.60)ratios sug-gested that TLP and HSM belonged to the A2-type granite.The negative whole rock εNd(t)values(-8.4 to-6.6)and negative zircon εHf(t)values(-15.9 to-6.3)confirmed that TLP and HSM were likely gener-ated by the partial melting of an ancient continental crust.The εHf(t)(-7.4 to +4.0)values of inherited zircons in the TLP suggested that they were derived from the partial melting of Archean basement rocks.Considering the geochemical similarity of the 1.80 Ga A-type granitoids in the SNCC,we pro-pose that the TLP and HSM were formed in a post-collisional regime that was likely associated with the break-off of the Paleoproterozoic subducted slab.Upwelling of the asthenosphere provided huge heat to generate the regional 1.80 Ga A-type granite in the SNCC.
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    Early Ordovician-Middle Silurian Subduction-Closure of the Proto-Tethys Ocean:Evidence from the Qiaerlong Pluton at the Northwestern Margin of the West Kunlun Orogenic Belt,NW China

    Jinhong XuZhengwei ZhangChengquan WuTaiyi Luo...
    430-448页
    查看更多>>摘要：Early Paleozoic magmatism in the West Kunlun Orogenic Belt(WKOB)preserves im-portant information about the tectonic evolution of the Proto-Tethys Ocean.This paper reports whole-rock compositions,zircon and apatite U-Pb dating,and zircon Hf isotopes for the Qiaerlong Pluton(QEL)at the northwestern margin of WKOB,with the aim of elucidating the petrogenesis of the pluton and shedding insights into the subduction-collision process of this oceanic slab.The QEL is mainly com-posed of Ordovician quartz monzodiorite(479±3 Ma),quartz monzonite(467-472 Ma),and syeno-granite(463±4 Ma),and is intruded by Middle Silurian peraluminous granite(429±20 Ma)and dia-base(421±4 Ma).Zircon εHf(t)values reveal that quartz monzodiorites(+2.1 to +9.9)and quartz mon-zonites(+0.6 to +6.8)were derived from a mixed source of juvenile crust and older lower crust,and sye-nogranites(-5.6 to +4.5)and peraluminous granites(-2.9 to +2.0)were generated from a mixed source of lower crust and upper crust;diabases had zircon εHf(t)values ranging from-0.3 to +4.1,and con-tained 463±5 Ma captured zircon and 1048±39 Ma inherited zircon,indicating they originated from enriched lithospheric mantle and were contaminated by crustal materials.The Ordovician granitoids are enriched in LILEs and light rare-earth elements,and depleted in HFSEs with negative Nb,Ta,P,and Ti anomalies,suggesting that they formed in a subduction environment.Middle Silurian peralumi-nous granites have the characteristics of leucogranites with high SiO2 contents(74.92 wt.%-75.88 wt.%)and distinctly negative Eu anomalies(δEu = 0.03-0.14),indicating that they belong to highly fractionated granite and were formed in a post-collision extension setting.Comparative analysis of these results with other Early Paleozoic magmas reveals that the Proto-Tethys ocean closed before the Middle Silurian and its southward subduction resulted in the formation of QEL.
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    Sedimentary and Heavy Mineral Records for the Oligocene-Miocene Exhumation of the Easternmost Tianshan

    Yan DingTianyi ShenGuocan WangJunliang Ji...
    449-461页
    查看更多>>摘要：The topography of the Harlik Mountain has a strong impact on the formation of current arid climate in the Turpan-Hami Basin.However,it is still controversial if Harlik Mountain experi-enced significant exhumation during the Middle to Late Cenozoic according to the previous thermo-chronology studies.The features of the Oligocene to Miocene sediments in the foreland basin could pro-vide productive information for resolving the debates.The peak ages of detrital apatite fission track analysis of the Oligocene-Miocene sandstone in the Turpan-Hami Basin are well comparable with the cooling age records of the Harlik Mountain rocks,indicating that the Oligocene-Miocene Taoshuyuan-zi Formation in the basin was mostly derived from the Harlik Mountain.The stratigraphic sequence ex-hibits coarsening upward,reflecting that the source area was in a tectonically active period during the deposition process.Heavy mineral assemblages also suggest that the unstable minerals in the sediment increased significantly at the end of the deposition.Moreover,the proportion of apatite increased up-section,while the garnet content decreased significantly,indicating that the Carboniferous metamor-phic rocks have been gradually eroded out and more intrusive rocks have been exposed to the surface.These observations suggest that the Harlik Mountain experienced exhumation during the Oligocene to Miocene,and the denudation depth afterward was probably less than 2.5 km according to the previous-ly apatite(U-Th)/He data.The Oligocene-Miocene exhumation probably acted as one of the triggers for the heavy drought of the Turpan-Hami Basin during the Middle-Late Neogene.
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    Geochronology,Geochemistry,and Sr-Nd-Hf Isotopes of the Diorite Porphyrites from the Weining Beishan Area,Ningxia Hui Autonomous Region:Constraints on Their Source and Tectonic Implications

    Anlu LiuLianfu HaiJinke LiuXiaojun Zhang...
    462-475页
    查看更多>>摘要：The Weining Beishan area of Ningxia Hui Autonomous Region is located at on the west-ern edge of the Helanshan tectonic belt,which is a tectonic joint among Alxa Block,Ordos Block,and North Qilian orogenic belt.However,the tectonic evolution of this area remains unclear due to the lack of magmatic information.This paper conducted researches on geochronology,geochemistry,and Sr-Nd-Hf isotopes of the diorite porphyrites exposed in the Weining Beishan area.The zircon U-Pb dating yields two ages of 145.0±1.1 and 146.2±1.5 Ma,and the whole-rock geochemical data indicate that the diorite porphyrites are metaluminous to weakly peraluminous and high-K calc-alkaline series.The characteristics of highly initial 87Sr/86Sr ratios(0.70816 to 0.71047),negative εNd(t)(-8.9 to-8.4),and negative εHf(t)(-13.8 to-21.2)indicate that the diorite porphyrites originated from partial melting of the middle-lower ancient crust related to the North China Craton.Combined with the regional geology,we suggested that partial melting was triggered by a tectonic activity of deep faults cutting through the crust under the regional stress transformation from compressing to extension during the Late Jurassic-Early Cretaceous,which is probably related to the westward subduction of the Paleo-Pacific Plate.
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    Integrated Stratigraphy and Mineralogy of the Doushantuo Formation in Weng'an,South China,and Implications for Ediacaran Phosphogenesis

    Liangxuan JiaoZhenbing SheDominic PapineauYaguan Zhang...
    476-503页
    查看更多>>摘要：The Ediacaran-Cambrian Phosphogenic Episode is the Earth's first true phosphogenic event and resulted in worldwide phosphate deposits,which occurred during the processes of the Neo-proterozoic Oxygenation Event.The Ediacaran Doushantuo Formation(ca.635-551 Ma)of Weng'an area in central Guizhou,South China,contains two economic phosphorite beds(the Lower and Upper Phosphorite Beds).This paper presents a detailed stratigraphic,sedimentological and mineralogical study of multiple outcrop and drill core sections of the Doushantuo Formation across the Weng'an ar-ea,and identified 11 lithofacies and 4 types of phosphatic grains.Significant differences in lithofacies and grain types between the upper and lower phosphate deposits are observed,indicating that the two sets of phosphate deposits are the products of two distinct phosphogenic processes.The Lower Phos-phorite Bed mainly consists of banded and laminated phosphorites,contains micro-oncoids formed by microbially-mediated precipitation and peloids formed by in-situ chemically oscillating reactions,indi-cating a biochemical and chemical enrichment of phosphorus to sediments during the Early Ediacaran Period.The Upper Phosphorite Bed is mainly composed of carbonaceous,massive,and stromatolitic phosphorites,contains bioclasts(phosphatized spheroidal fossils),and intraclasts formed by hydrody-namic agitation,suggesting that the major accesses of phosphorus to sediments were the remineraliza-tion of organic P.Deposition of the two economic phosphorite beds was controlled by two sea-level cy-cles.Such differences have also been documented in contemporaneous phosphate-bearing successions in Brazil and Mangolia,indicating a significant shift in global phosphogenic mechanism during the ear-ly and middle Ediacaran,which may be due to the changes in redox conditions in seawater,associated with the Neoproterozoic Oxygenation Event.These regional active P-cycle processes could produce more free oxygen,which may have contributed to the upcoming Phanerozoic global oxidation.
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