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Material transportation and fluid-melt activity in the subduction channel: Numerical modeling

Science China Earth Sciences 2015年第8期58卷 1251-1268页

作者： LI ZhongHai LIU MingQi Taras GERYA State Key Laboratory of Continental Tectonics and Dynamics Institute of Geology Chinese Academy of Geological Sciences Institute of Geophysics Department of Earth SciencesETH-Zurich

The subduction channel is defined as a planar to wedge-like area of variable size,internal structure and composition,which forms between the upper and lower plates during slab subduction into the *** materials in the channel may experience complex pressure,temperature,stress and strain evolution,as well as strong fluid and melt activity.A certain amount of these materials may subduct to and later exhume from>100 km depth,forming high to ultra-high pressure rocks on the surface as widely discovered in *** deformation in the channel is strongly assisted by metamorphic fluids activities,which change composition and mechanical properties of rocks and thus affect their subduction and exhumation *** this study,we investigate the detailed structure and dynamics of both oceanic and continental subduction channels,by conducting highresolution petrological-thermomechanical numerical simulations taking into account fluid and melt *** numerical results demonstrate that subduction channels are composed of a tectonic rock melange formed by crustal rocks detached from the subducting slab and the hydrated mantle rocks scratched from the overriding *** rocks may either extrude sub-vertically upward through the mantle wedge to the crust of the upper plate,or exhume along the subduction channel to the surface near the suture *** on our numerical results,we first analyze similarities and differences between oceanic and continental subduction *** further compare numerical models with and without fluid and melt activity and demonstrate that this activity results in strong weakening and deformation of overriding ***,we show that fast convergence of orogens subjected to fluid and melt activity leads to strong deformation of the overriding lithosphere and the topography builds up mainly on the overriding *** contrast,slow convergence of such orogens leads to very limited deformation of the overriding lithosphere

关键词： subduction channel fluid activity partial melting topography numerical modeling

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A subduction channel model for exhumation of oceanic-type high-pressure to ultrahigh-pressure eclogite-facies metamorphic rocks in SW Tianshan,China

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Science China Earth Sciences 2016年第12期59卷 2339-2354页

作者： LI JiLei GAO Jun WANG XinShui Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences

High-pressure(HP) and ultrahigh-pressure(UHP) eclogites exposed in collisional orogens are widely regarded to record the history of crustal rocks that were subducted to mantle depths and exhumed back to the *** into subduction and exhumation processes plays an important role in understanding the nature and evolution of subduction zones,geodynamics and plate *** contrast to continental-type HP to UHP metamorphic rocks that are dominated by felsic lithology,oceanic-type HP to UHP metamorphic rocks are dominated by mafic eclogites and thus have greater density,and their exhumation needs to overcome large barriers and may involve complicated tectonic *** exhumation of HP to UHP rocks is mainly influenced by the internal buoyancy,however,the external tectonic forces(such as channel flow) also act as effective exhumation drivers;in addition,effects of tectonic settings(such as slab rollback and breakoff) should take into *** HP-UHP metamorphic terrane in Southwestern Tianshan,which mainly comprises of metasediments with interlayered metamafic lenses and blocks,represents a typical accretionary melange associated with deep subduction of oceanic ***,the exhumation mechanisms of these once deeply buried HP-UHP rocks are still under *** on the field occurrences,petrographic features,peak metamorphic P-T conditions and ages of the eclogites/blueschists and their metasedimentary country rocks,a "sediment-type subduction channel" model is advocated in this study to appraise/decipher the formation and evolution of Southwestern Tianshan HP-UHP metamorphic ***-cyclic metamorphic eclogites record the multistage burial-exhumation cycling manipulated by convective flow in a channel-like interface between the plates,giving robust evidence for the presence of a subduction *** addition,this study summarizes some remaining geotectonic problems and research perspectives concerning the Southwestern Tianshan HP-UHP me

关键词： Eclogite High-pressure metamorphism Oceanic crust Exhumation subduction channel Southwestern Tianshan

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Partial melting and crust-mantle interaction in subduction channels:Constraints from experimental petrology

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Science China Earth Sciences 2015年第9期58卷 1700-1712页

作者： ZHANG JunFeng WANG ChunGuang XU HaiJin WANG Chao XU WenLiang State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of Geosciences Global Tectonic Center School of Earth Sciences China University of Geosciences School of Earth Sciences Jilin University

It is proposed in the subduction channel model that the plate interface interaction is a basic mechanism for the mass and energy exchange between Earth’s surface and *** significant difference in composition and nature between continental lithosphere and oceanic lithosphere inevitably leads to variations in deep physical and chemical processes as well as crust-mantle interaction products in these two *** studies of experimental petrology have provided constraints on the potential partial melting and crust-mantle interaction in oceanic subduction channels for silicate and carbonate *** partial melts of mafic and felsic compositions are adakitic or non-adakitic granitic melts depending on melting pressure or depth.A trivial amount of CO2 can lower significantly the melting temperature of peridotites and lead to pronounced enrichment of incompatible elements in carbonate *** silica saturated or unsaturated melts can react with mantle-wedge peridotites in subduction channels to generate complex ***,the existing experiments are mostly dedicated to island arc settings above oceanic subduction zones rather than dehydration melting above continental subduction *** is crucial to conduct high pressure and high temperature experiments to investigate all possible reactions between peridotites and crustal materials and their derivatives under the conditions responsible for the slab-mantle interface in continental subduction *** results,combined with natural observations,are possible to elucidate the processes of metamorphic dehydration,partial melting and mantle metasomatism in continental subduction channels.

关键词： subduction channel partial melting crust-mantle interaction high P-T experiments

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The study of subduction channels:Progress,controversies,and challenges

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Science China Earth Sciences 2020年第12期63卷 1831-1851页

作者： Jianxin Zhang Key Laboratory of Deep-Earth Dynamics of the Ministry of Land and Resources Institute of GeologyChinese Academy of Geological SciencesBeijing100037China

The subduction channel is defined as a relatively thin and weak zone with coherent kinematics between the descending and overriding plates during *** materials in the channel,showing the characteristics of mélange,consist of low-density,low-viscosity,highly sheared metasediments and/or serpentinite-rich matrix with relatively rigid *** channel materials flow downwards and upwards,forming a kind of channel *** on geophysical and geological observations on active oceanic subduction zones,combined with numerical simulations,the subduction channel model was initially set to shallow depthssubduction zone investigations,the subduction channel model was extended to depths of 80-100 km to describe deeper geodynamic environments of oceanic subduction zones and explore the exhumation of high to ultrahigh pressure metamorphic *** is also extended to continental subduction zones in order to explain the exhumation of metamorphic rocks in different grades as well as fluid activity and crust-mantle interaction during continental *** there are a series of differences in material composition and slab/mantle interface property between the upper and lower plates,continental subduction channels exhibit many similarities in structure and dynamics to oceanic subduction *** studies have provided a fundamental understanding of the structural and dynamic characteristics of subduction channels,but many problems still need to be solved and *** particular,the fundamental characteristics of subduction channels obtained by numerical simulation need to be confirmed and modified through geological investigations of fossil subduction channels.

关键词： Plate interface subduction channel Mélange Numerical modeling High-ultrahigh pressure metamorphism Exhumation mechanism

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Petrology and metamorphism of glaucophane eclogites in Changning-Menglian suture zone, Bangbing area, southeast Tibetan Plateau: An evidence for Paleo-Tethyan subduction

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China Geology 2021年第1期4卷 111-125页

作者： Yu-zhen Fu Zhi-ming Peng Bao-di Wang Guo-zhi Wang Jing-feng Hu Jun-lei Guan Ji Zhang Zhang Zhang Yun-he Liu Zou Hao College of Earth Sciences Chengdu University of TechnologyChengdu 610059China Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Natural Resources Chengdu University of TechnologyChengdu 610059China Chengdu Center of China Geological Survey Ministry of Natural ResourcesChengdu 610081China Institute No.280 of China National Nuclear Corporation Guanghan 618300China

High/ultrahigh-pressure(HP/UHP)metamorphic complexes,such as eclogite and blueschist,are generally regarded as significant signature of paleo-subduction zones and paleo-suture *** eclogites have been recently identified within the Lancang Group characterized by accretionary mélange in the Changning-Menglian suture zone,at Bangbing in the Shuangjiang area of southeastern Tibetan *** authors report the result of petrological,mineralogical and metamorphism investigations of these rocks,and discuss their tectonic *** eclogites are located within the Suyi blueschist belt and occur as tectonic lenses in coarse-grained garnet muscovite *** major mineral assemblage of the eclogites includes garnet,omphacite,glaucophane,phengite,clinozoisite and *** garnet contains numerous inclusions,such as omphacite,glaucophane,rutile,and quartz with radial cracks *** and clinozoisite in the matrix have apparent optical and compositional *** stages of metamorphic evolution can be determined:The prograde blueschist facies(M_(1)),the peak eclogite facies(M_(2)),the decompression blueschist facies(M_(3))and retrograde greenschist facies(M_(4)).Using the Grt-Omp-Phn geothermobarometer,a peak eclogite facies metamorphic P-T condition of 3000–3270 MPa and 617–658℃ was determined,which is typical of low-temperature ultrahigh-pressure *** comparison of the geological characteristics of the Bangbing glaucophane eclogites and the Mengku lawsonite-bearing retrograde eclogites indicates that two suites of eclogites may have formed from significantly different depths or localities to create the tectonic mélange in a subduction channel during subduction of the Triassic Changning-Menglian *** discovery of the Bangbing glaucophane eclogites may represent a new oceanic HP/UHP metamorphic belt in the Changning-Menglian suture zone.

关键词： Eclogite HP/UHP metamorphism subduction channel Changning-Menglian suture zone Paleo-Tethyan subduction Geological survey engineering Southeast Tibetan Plateau

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The Dabie-Sulu orogenic peridotites:Progress and key issues

The Dabie-Sulu orogenic peridotites:Progress and key issues

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： CHEN Yi SU Bin GUO Shun State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau Earth Sciences

Orogenic peridotites in the Dabie-Sulu orogenic belt are commonly subdivided into‘crustal’type and‘mantle’*** exhibit distinct mineral textures,metamorphic evolution,and whole-rock and mineral ***‘mantle’type peridotites originated from the subcontinental lithospheric mantle(SCLM)of the North China Craton and thus provide direct evidence of crust-mantle interactions in the continental subduction *** garnet peridotites,both garnet and Cr-spinel can be equilibrated at peak pressure *** stabilities are mainly controlled by the refertilized degree of whole-rock;therefore,spinel composition cannot be used to discriminate the partial melting degree of orogenic *** mantle-derived dunites contain the textures of low Mg and high Ca olivine veins that crosscut orthopyroxene porphyroblasts,which is considered as evidence for silica-undersaturated melt-rock *** reactions occurring before subduction may potentially affect Re-Os isotopic ***,Ti-clinohumite and zircon in mantle-derived peridotites or pyroxenites provide direct mineralogical evidence for the transport of high field strength elements(HFSEs)from the subducted crust into the mantle *** on detailed in situ element and isotope analyses,we can constrain the source of metasomatic agents,the metasomatic time and the process of mass *** mantle wedge above continental subduction zones has a wide range of oxygen fugacity values(FMQ=?5.50–1.75),showing a roughly negative correlation with the subducted ***,the calculated results of oxygen fugacity are significantly affected by mineral assemblages,P-T conditions and dehydrogenation-oxidation of nominally anhydrous mantle olivine during *** significant progress has been made in the study of orogenic peridotites in the Dabie-Sulu orogenic belt,many critical questions *** new approaches and advanced technologic applications,additional knowledge o

关键词： garnet peridotite subduction channel subduction zone fluids/melts crust-mantle interaction oxygen fugacity

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