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lithospheric thinning and ignition of a Cordilleran magmatic flare-up:Geochemical and O-Hf isotopic constraints from Cretaceous plutons in southern Korea

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Geoscience Frontiers 2023年第1期14卷 327-345页

作者： Albert Chang-sik Cheong Min-Ji Jung Hui JeJo Jeongmin Kim Shinae Lee Youn-Joong Jeong Korea Basic Science Institute Ochang Center Cheongju 28119Republic of Korea Graduate School of Analytical Science and Technology Chungnam National UniversityDaejeon 34134Republic of Korea Korea Institute of Geoscience and Mineral Resources Daejeon 34132Republic of Korea

Northeast Asian continental margins contain the products of magma emplacement driven by prolonged subduction of the(paleo-)Pacific *** observed in many Cordilleran arcs,magmatic evolution in this area was punctuated by high-volume pulses amid background *** present study investigates the early evolution of the Cretaceous magmatic flare-up using new and published geochronological,geochemical,and O-Hf isotope data from plutonic rocks in the southern Korean *** a long(~50 m.y.)magmatic hiatus and the development of the Honam Shear Zone through flat-slab subduction,the Cretaceous flare-up began with the intrusion of monzonites,granodiorites,and granites in the inboard Gyeonggi Massif and the intervening Okcheon *** to Jurassic granitoids formed during the former flare-up,Albian(~111 Ma)monzonites found in the Eopyeong area of the Okcheon Belt have distinctly higher zirconε_(Hf)(t)(-7.5±1.3)andδ^(18)O(7.78‰±0.25‰)values and lower wholerock La/Yb and Sr/Y *** voluminous coeval granodiorite and granite plutons in the Gyeonggi Massif are further reduced in Sr/Y and to a lesser extent,in La/Yb,and have higher zirconε_(Hf)(t)values(-13 to-19)than the Precambrian basement(ca.-30).These chemical and isotopic features indicate that Early Cretaceous lithospheric thinning,most likely resulting from delamination of tectonically and magmatically overthickened lithospheric keel that was metasomatized during prior subduction episodes,and consequent asthenospheric upwelling played vital roles in igniting the magmatic *** O-Hf isotopic ranges of synmagmatic zircons from the Albian plutons and their Paleoproterozoic and Jurassic inheritance attest to the involvement of lithospheric mantle and crustal basement in magma generation during this decratonization *** magmatism then migrated trenchward and culminated in the Late Cretaceous,yielding widespread granitoid rocks emplaced at shallow crustal *** early Late Cretaceous(94-8

关键词： Cordilleran arc Cretaceous flare-up Korean Peninsula lithospheric thinning Crustal rejuvenation

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Formation time of the big mantle wedge beneath eastern China and a new lithospheric thinning mechanism of the North China craton—Geodynamic effects of deep recycled carbon

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Science China Earth Sciences 2018年第7期61卷 853-868页

作者： Shuguang LI Yang WANG State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China

High-resolution P wave tomography shows that the subducting Pacific slab is stagnant in the mantle transition zone and forms a big mantle wedge beneath eastern China. The Mg isotopic investigation of large numbers of mantle-derived volcanic rocks from eastern China has revealed that carbonates carried by the subducted slab have been recycled into the upper mantle and formed carbonated peridotite overlying the mantle transition zone, which becomes the sources of various basalts. These basalts display light Mg isotopic compositions(δ26 Mg = –0.60‰ to –0.30‰) and relatively low87 Sr/86 Sr ratios(0.70314–0.70564) with ages ranging from 106 Ma to Quaternary, suggesting that their mantle source had been hybridized by recycled magnesite with minor dolomite and their initial melting occurred at 300-360 km in depth. Therefore, the carbonate metasomatism of their mantle source should have occurred at the depth larger than 360 km, which means that the subducted slab should be stagnant in the mantle transition zone forming the big mantle wedge before 106 Ma. This timing supports the rollback model of subducting slab to form the big mantle wedge. Based on high P-T experiment results, when carbonated silicate melts produced by partial melting of carbonated peridotite was raising and reached the bottom(180–120 km in depth) of cratonic lithosphere in North China, the carbonated silicate melts should have 25–18 wt% CO2 contents, with lower Si O2 and Al2 O3 contents, and higher Ca O/Al2 O3 values, similar to those of nephelinites and basanites, and have higher εNdvalues(2 to 6). The carbonatited silicate melts migrated upward and metasomatized the overlying lithospheric mantle, resulting in carbonated peridotite in the bottom of continental lithosphere beneath eastern China. As the craton lithospheric geotherm intersects the solidus of carbonated peridotite at 130 km in depth, the carbonated peridotite in the bottom of cratonic lithosphere should be partially melted, thus its physica

关键词： Big mantle wedge North China craton lithospheric thinning Deep carbon recycling Alkaline basalts

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Recycling of crustal materials and implications for lithospheric thinning: Evidence from Mesozoic volcanic rocks in the Hailar-Tamtsag Basin, NE China

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Geoscience Frontiers 2021年第5期12卷 149-165页

作者： Zheng Ji Yan-Long Zhang Chuan-Biao Wan Wen-Chun Ge Hao Yang Yu Dong Yan Jing College of Earth Sciences Jilin UniversityChangchun 130061China Exploration and Development Research Institute Daqing Oilfield Limited CompanyDaqing 163712China

Late Mesozoic Nb-rich basaltic andesites and high-Mg adakitic volcanic rocks from the Hailar-Tamtsag Basin,northeast China,provide important insights into the recycling processes of crustal materials and their role in late Mesozoic lithospheric *** Late Jurassic Nb-rich basaltic andesites(154±4 Ma)are enriched in large-ion lithophile and light rare earth elements,slightly depleted in high-field-strength elements,and have high TiO_(2),P_(2)O_(5),and Nb contents,and(Nb/Th)PM and Nb/U ratios,which together with the relatively depleted Sr-Nd-Hf isotopic compositions indicate a derivation from a mantle wedge metasomatized by hydrous melts from subducted oceanic *** Early Cretaceous high-Mg adakitic volcanic rocks(129-117 Ma)are characterized by low Y and heavy rare earth element contents,and high Sr contents and Sr/Y ratios,similar to those of rocks derived from partial melting of an eclogitic *** also have high Rb/Sr,K_(2)O/Na_(2)O,and Mg#values,and high MgO,Cr,and Ni *** geochemical features suggest that the adakitic lavas were derived from partial melting of delaminated lower continental crust,followed by interaction of the resulting melts with mantle material during their *** data,along with available geological,paleomagnetic,and geophysical evidence,lead us to propose that recycling of Paleo-Pacific oceanic crustal materials into the upper mantle due to flat-slab subduction and rollback of the Paleo-Pacific Plate during the late Mesozoic likely provided the precondition for lithospheric thinning in northeast China,with consequent lithospheric delamination causing recycling of continental crustal materials and further lithospheric thinning.

关键词： Late Mesozoic lithospheric thinning Hailar-Tamtsag Basin Paleo-Pacific Plate Volcanic rock

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Geochronology and Geochemistry of Late Triassic Intrusive Rocks in the Xiuyan Area,Liaodong Peninsula,Eastern North China Craton:Petrogenesis and Implications for lithospheric thinning

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Acta Geologica Sinica(English Edition) 2021年第5期95卷 1493-1508页

作者： ZHANG Yanfei DONG Yang XIAO Rongge LIU Jingdang ZHAO Baoju Shenyang Center China Geological SurveyShenyang 110034China Liaoning Technical University FuxinLiaoning 123000China Geological Survey Institute of Liaoning Province Shenyang 110000China China University of Geosciences Beijing 100083China

The timing and mechanisms of lithospheric thinning and destruction of the North China Craton(NCC)remain controversial,and the overall geodynamics of the process are poorly *** paper documents Late Triassic igneous rocks including monzogranite,gabbro,and diorite from the Xiuyan District on the Liaodong Peninsula in the eastern NCC,which have LA-ICP-MS zircon U-Pb ages of 229.0±0.4 Ma,216.2±0.9 Ma,and 210.6±2.0 Ma,*** shows high-SiO_(2) adakite affinity,negative ε_(Hf)(t)values(-20.6 to-17.9),and old T_(DM2) ages(3.53-3.29 Ga),suggesting that their parental magma was derived from thickened Paleoarchean mafic lower crust and minor mantle materials that were also involved their *** is ultrapotassic,strongly enriched in LREEs and LILEs,depleted in HFSEs,and has evolved zircon Hf isotopes with negative ε_(Hf) of -10.04 to-5.85 and old T_(DM2) ages(2.59-2.22 Ga).These are diagnostic signatures of a crustal component,but their high contents of Mg O,Cr,Co,Ni indicate that the primary magma originated from enriched *** is enriched in LILEs and LREEs,depleted in HFSEs(with negative Nb,Ta,and Ti anomalies),and contains negative ε_(Hf)(t)values(-13.64 to-11.01).Compared with the gabbro,the diorite is relatively enriched in Nb,Ta and HREEs,and also contains younger T_(DM2) ages(2.11-1.94 Ga),suggesting that the diorite was formed by mixing between ancient lower crust-derived felsic magmas and asthenospheric mantle-derived *** observations,geochronology,geochemistry,and zircon Lu-Hf isotopes indicate that Late Triassic magmatism and tectonic activity resulted from deep subduction of the Yangtze Craton beneath the NCC in the Xiuyan *** phase of tectonic activity was completed in the eastern NCC by the Late Triassic(216 Ma),and was subsequently followed by lithospheric thinning that began in the Late Triassic.

关键词： Late Triassic craton destruction lithospheric thinning change in tectonic mechanism eastern North China Craton

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Complex upper-mantle deformation beneath the North China Craton:implications for lithospheric thinning

Complex upper-mantle deformation beneath the North China Cra...

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中国科学院地质与地球物理研究所2007学术年会

作者：赵亮 Seismological Laboratory(SKL-LE) Institute of Geology and GeophysicsChinese Academy of SciencesChina

The mechanism of lithospheric thinning of the North China Craton(NCC) remains controversial. To constrain the mechanism,this study investigated the upper-mantle deformation pattern of the craton by measuring shear wave splitting at the cratonic *** results,derived from data recorded at 47 stations,reveal a complex pattern of mantle *** the eastern craton,the majority of fast direction trends SE-NW parallel to the tectonic extension direction accompanying with the lithospheric *** the cratonic edge,15 stations with only null splitting results indicate undetectable anisotropy beneath the *** may be due to upwelling or chaotic ascension of mantle *** the norm,off the craton,large delay times and variation of splitting parameter with backazimuth are generated by the combination of lithospheric and asthenospheric *** on comparison of the splitting results and the predicted ones by the compelling models,it is likely that lithospheric delamination dominated the lithospheric thinning at the north edge of the NCC during the Mesozoic to Cenozoic.

关键词： lithospheric thinning mantle deformation North China Craton shear wave splitting seismic anisotropy.

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Petrogenesis of the Early Jurassic Nandaling flood basalts in the Yanshan belt,North China Craton:A correlation between magmatic underplating and lithospheric thinning

Petrogenesis of the Early Jurassic Nandaling flood basalts i...

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中国科学院地质与地球物理研究所2007学术年会

作者： Zhihong Wang~(a,*),Yue Zhao~b,Haibo Zou~c,Wuping Li~d,Xiaowen Liu~e, Hai Wu~e,Gang Xu~b,Suanhong Zhang ~b a State Key Laboratory of lithospheric Evolution,Institute of Geology and Geophysics.Chinese Academy of Sciences,Beijing,100029.China b Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing,100081.China c Department of Earth and Space Sciences.University of California at Los Angeles,Los Angeles,CA 90095,USA d Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,510640.China c Centre of Geological Materials,The Ministry of Land and Resources P.R.C.,Hebei,065201,China

Integrated geochemical and Sr-Nd-Pb isotopic studies of the Early Jurassic Nandaling flood basalts(NFB) in the Yanshan belt, northern margin of the North China Craton(NCC),are presented in this *** sub-alkaline basalts evolved from a more magnesium-rich parental magma through fractional crystallization of olivine and *** primitive magma of the NFB originated from 2-5%partial melting of spinel to garnet transitional peridotite at about 70-80 km depth in the Mesozoic lithosphere *** NFB contain a distinctive lithospheric component,characterized by Nb(Ta),Th,U and Ti depletions,LREE enrichments, moderate Sr,and low Nd and Pb initial isotopic ratios,as a result of an interaction between lower crust(15-25%) and primitive magma evoked by magmatic underplating at crust-mantle *** Early Jurassic NFB extruded in an intraplate extensional setting related to post-orogenic collapse in the northern margin of the NCC,indicating an event of lithospheric modification earlier than that in the southern margin(Early Cretaceous).The temporal similarity of the Jurassic-Cretaceous mantle-derived mafic rocks to lower crust replacement,and the decoupling of surface shortening with lithospheric thinning during the Late Jurassic-Early Cretaceous, suggest the important role of magmatic underplating and subsequent crust-mantle interaction accompanied by asthenosphere upwelling on the evolution of the Mesozoic lithosphere of the *** correlation between lithospheric thinning and magmatic underplating may be an important process in continental rifting.

关键词： Early Jurassic Nandaling flood basalts Petrogenesis Magmatic underplating lithospheric thinning North China Craton

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Lower crustal processes leading to Mesozoic lithospheric thinning beneath eastern North China:Underplating,replacement and delamination

Lower crustal processes leading to Mesozoic lithospheric thi...

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中国科学院地质与地球物理研究所2007学术年会

作者： Mingguo Zhai~(a,b,d,*),Qicheng Fan~c,Hongfu Zhang~(a,d),Jianli Sui~a,Ji’an Shao~e a Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China b Key Laboratory of Mineral Resources.Chinese Academy of Sciences,Beijing,100029,China c Institute of Geology,Chinese Seismological Bureau.Beijing,100029,China d State Key Laboratory of Lithosphere Tectonic Evolution,Beijing,100029,China c School of Earth and Space Sciences,Peking University,Beijing,100871,China

Our recent studies show that the lower crust and lithospheric mantle in the eastern North China Craton(NCC) was thinned in the *** lower crust played a key role in the tectonic mechanism that led to lithospheric *** data from volcanic rocks and xenoliths support the idea that delamination of the lower crust and lithospheric mantle took place only along the northern and perhaps the southern margins of the NCC,and this was linked to post-collisional orogenic ***,it is difficult for the delamination process to act on the whole eastern NCC and remove 80-120 km of the *** crustal xenoliths in Mesozoic and Cenozoic basalts within the NCC arc of two *** is granulite-facies metamorphosed two pyroxene gabbros and eclogite-facies metamorphosed garnet pyroxenites formed at 140-120 *** other is Precambrian granulites that were strongly overprinted by Mesozoic ***-scale lower crustal replacement took place in the Mesozoic beneath the *** other words,some or perhaps most part of the present lower crust of the NCC is not *** present lowermost crust is mostly composed of Mesozoic meta-gabbros and *** late Jurassic,high-Sr granites in the NCC,which are compositionally similar to a dakite,probably formed by partial melting of the lowermost crust,leaving a residue of eclogite or garnet amphibolite.A hot upwelling mantle was necessary to partially melt the pre-existing lowermost crust and underplate magma in order to form the present lower *** eclogites could sink into the mantle,it is hard to imagine that there was a thick enough eclogite layer that could drag 80-120 km of the lithosphere into the asthenosphere beneath the NCC. Magmatic underplating seems to be a better alternative ***,the formation of the present lower crust through the underplating and replacement of the pre-existing one was closely related to lithospheric thinning,and represented a con

关键词： Lower crustal processes:Underplating Dclamination lithospheric thinning North China

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A review of the geodynamic setting of large-scale Late Mesozoic gold mineralization in the North China Craton:an association with lithospheric thinning

A review of the geodynamic setting of large-scale Late Mesoz...

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中国科学院地质与地球物理研究所2003学术年会

作者： Simon A.Wilde Department of Applied Geology Curtin University of TechnologyP.O.Box U1987PerthWesternAustralia 6845Australia

Abundant gold deposits are distributed along the margins of the North China Craton(NCC).Occurring throughout the Precambrian basement and located in or proximal to Mesozoic granitoids,these deposits show a consistent spatial -temporal association with Late Jurassic-Early Cretaceous magmatism and are characterized by quartz lode or disseminated styles of mineralization with extensive alteration of wall *** ages are mainly Early Cretaceous(130-110 Ma) and constrain a very short period of ***-Nd-Pb isotopic tracers of ores,minerals and associated rocks indicate that gold and associated metals mainly were derived from multi-sources,i.e.,the wall rocks(Precambrian basement and Mesozoic granites) and associated mafic rocks. Previous studies,including high surface heat flow,uplift and later basin development,slow seismic wave speeds in the upper mantle,and a change in the character of mantle xenoliths sampled by Paleozoic to Cenozoic magmas,have been used to suggest that ancient,cratonic mantle lithosphere was removed from the base of the NCC some time after the Ordovician,and replaced by younger,less refractory lithospheric *** geochemistry and isotopic compositions of the mafic rocks associated with gold mineralization(130-110 Ma) indicate that they were derived from an ancient enriched lithospheric mantle source;whereas,the mafic dikes and volcanic rocks younger than 110 Ma were derived from a relatively depleted mantle source,i.e.,asthenospheric *** to their age and sources,relation to magmatism and geodynamic framework,the gold deposits were formed during lithospheric *** removal of lithospheric mantle and the upwelling of new asthenospheric mantle induced partial melting and dehydration of the lithospheric mantle and lower crust due to an increase of *** fluids derived from the lower crust were mixed with magmatic and meteoric waters,and resulted in the deposition of gold and associated metals.

关键词： Gold mineralization Early Cretaceous lithospheric thinning North China Craton

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Plate tectonics in the twenty-first century

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Science China Earth Sciences 2023年第1期66卷 1-40页

作者： Yong-Fei ZHENG CAS Key Laboratory of Crust-Mantle Materials and Environments Hefei 230026China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China

Plate tectonics was originally established as a kinematic theory of global tectonics,in which the Earth’s rigid outer layer,the lithosphere,consists of different size plates that move relative to each other along divergent,convergent or transform boundaries overlying the ductile *** comprises three elements:rigid lithosphere plates,ductile asthenosphere,and coupled movement *** operates through the interlinked processes of continental drift,seafloor spreading and lithospheric subduction,resulting in the generation,modification and demise of lithospheres throughout geological *** system of lithospheric plates in horizontal and vertical movements forms the spatiotemporal linkages of matter and energy between the surface and interior of Earth,advancing the kinematic theory with a dynamic *** top-down tectonics through lithospheric subduction plays a key role in the operation of plate tectonics,it is balanced for the conservation of both mass and momentum on the spherical Earth by bottom-up tectonics through asthenospheric upwelling to yield seafloor spreading after continental *** gravity-driven subduction of cool lithosphere proceeds through convergence between two plates on one side,and rollback of the subducting slab makes the vacancy for upwelling of the hotter asthenosphere to form active rifting in backarc *** convergence is coupled with plate divergence between two plates along mid-ocean ridges on the other side,inducing passive rifting for seafloor spreading as a remote ***,plate tectonics is recognizable in rock records produced by tectonic processes along divergent and convergent plate *** the asthenospheric upwelling along fossil suture zones may result in continental breakup,seafloor spreading is only induced by gravitational pull of the subducting oceanic slab on the remote ***,the onset and operation of plate tectonics are associated with a series of plate divergent-con

关键词： Continental breakup Seafloor spreading Oceanic subduction Continental collision lithospheric thinning Asthenospheric upwelling

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The effects of the thermal state of overriding continental plate on subduction dynamics: Two-dimensional thermal-mechanical modeling

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Science China Earth Sciences 2020年第10期63卷 1519-1539页

作者： Jiaxuan TANG Lin CHEN Qingren MENG Guoli WU State Key Laboratory of lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

The dynamic process of ocean-continent subduction depends on not only the properties of the subducting oceanic plate,but also the characteristics and state of the overriding continental *** models conducted to date have mostly focused on the oceanic lithosphere in this regard;research on the properties of overriding continental lithosphere remains relatively limited,especially the influence of its thermal state on subduction *** we explored the performance of continental lithosphere with different thermal states during the subduction process using two-dimensional thermal-mechanical modeling and systematically investigated the effects of the thermal state of overriding continental plate,the age of subducting oceanic plate,and relative convergence rate on subduction *** results show that:(1)When the geothermal gradient of continental crust is low(between 10 and 15℃km^-1),the oceanic plate first subducts at a low *** subduction continues,the slab dip gradually increases and the slab begins to retreat rapidly driven by its negative buoyancy,opening an ocean basin ranging from 600 to 1100 km in *** leads to the decoupling between the overriding continental plate and oceanic *** the trench retreat continues,the horizontal deviatoric stress inside the overriding continental crust alternates between being positive and negative in a local *** of the overriding lithosphere mainly occurs at the region adjacent to the subduction zone,where the surface experiences significant subsidence.(2)When the geothermal gradient of continental crust is higher(greater than 15℃km-1),oceanic plate retreat causes the overriding continental plate to be strongly *** this case,the trench retreat distance decreases and the width of the ocean basin also reduces by between 100 and 1000 *** horizontal deviatoric stress inside the whole overriding continental crust first manifests as compression and then changes into extension,

关键词： Subduction Continental plate Thermal state Trench retreat lithospheric thinning Rift basin

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