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evolution and final closure of the Mongol-Okhotsk Ocean

Science china Earth sciences 2023年第11期66卷 2497-2513页

作者： Pan zhao Bei XU Yan CHEN state key laboratory of lithospheric evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Hebei key laboratory of Strategic Critical Mineral Resources Hebei GEO UniversityShijiazhuang 050031China Universitéd’Orléans CNRSBRGMISTOUMR 7327Orléans F-45071France

Mongol-Okhotsk Orogenic Belt is the last main orogen that constructs modern tectonic framework of northeastern Asia. It has recorded the long-term evolution of the Mongol-Okhotsk Ocean(MOO) from its Early Paleozoic initial opening,through the Late Paleozoic-Early Mesozoic subduction, to its Mesozoic final closure, leading to the amalgamation of the Siberian Craton(SIB) and North china-Amuria Block(NCC-AMB). Opening of the MOO can be traced to the early stage of the Early Paleozoic. Northward subduction of the Mongol-Okhotsk oceanic slab beneath the southern margin of the SIB initiated in the Silurian, whereas the southward subduction beneath the northern margin of the NCC-AMB started in the Late Devonian. The bidirectional subduction of the Mongol-Okhotsk oceanic slab resulted in pulse arc magmatism, with three main peaks in the earliest Carboniferous, Late Permian, and Late Triassic-Early Jurassic. In the Late Triassic, the collision between the AMB and Western Mongolian Blocks led to the bending of the Western Mongolian Blocks, which caused the initial closure of the MOO in its western segment. Due to the clockwise rotation of the SIB and counterclockwise rotation of the NCC-AMB, the MOO showed a scissor-like closure from west to east. The final closure of the MOO occurred in the Middle-Late Jurassic, which also resulted in the formation of the Mongol Orocline. Since then, the amalgamation of blocks in northeastern Asia has finished, and the northeastern Asian continent went into the intraplate evolutional stage.

关键词： Northeastern Asia Mongol-Okhotsk Ocean Paleozoic-Mesozoic Subduction initiation Scissor-like closure

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太岳山17.9亿年英安斑岩的发现及其对华北克拉通南部裂谷系成因的约束

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岩石学报 2024年第4期40卷 1327-1342页

作者：范昱宏祝禧艳段庆松马建锋贾朝媛刘书琪赵太平中国科学院地质与地球物理研究所中国科学院矿产资源研究重点实验室北京100029 中国科学院大学北京100049 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室北京100029 中国科学院广州地球化学研究所矿物学与成矿学重点实验室广州510640 中国地质大学(北京)地球科学与资源学院北京100083

熊耳群火山岩系主要分布于华北克拉通南部地区,主体喷发时限是1.75~1.80Ga。作为华北克拉通早期板块构造调整阶段的首次大规模岩浆活动,该火山-侵入岩系的形成时限、时空分布规律和地球动力学背景尚有争议,制约了对华北克拉通中元古代... 详细信息

熊耳群火山岩系主要分布于华北克拉通南部地区,主体喷发时限是1.75~1.80Ga。作为华北克拉通早期板块构造调整阶段的首次大规模岩浆活动,该火山-侵入岩系的形成时限、时空分布规律和地球动力学背景尚有争议,制约了对华北克拉通中元古代构造演化的进一步认识。本次研究在华北中部太岳山地区识别出中元古代英安斑岩,与古元古代花岗质片麻岩围岩呈侵入关系,无明显变质变形。锆石U-Pb年龄分析结果表明,该英安斑岩形成于1.79Ga,属于熊耳期岩浆活动的产物。样品中约90%的锆石显示出~1.92Ga和~2.16Ga两期年龄峰值,推测其为围岩的捕获锆石。英安斑岩SiO_(2)含量为65.12%~66.11%,A/CNK=0.91~1.05,全碱(K_(2)O+Na_(2)O)含量为6.85%~7.28%,Na_(2)O/K_(2)O=0.48~0.54,属于钾玄岩系列。样品稀土元素含量较高,亏损Nb、Ta、Zr、Hf等高场强元素,富集Rb、Ba、La等大离子亲石元素,与华北克拉通南部地区熊耳期英安-流纹斑岩的地球化学特征完全一致,指示板内伸展环境。太岳山熊耳期英安斑岩的发现,贯通了中条山地区的熊耳群火山岩系、吕梁地区汉高山群和小两岭火山岩系,完善了熊耳三叉裂谷系北支的空间分布范围,是华北克拉通中部地区开启中元古代裂陷作用演化的重要岩浆记录。

关键词：英安斑岩熊耳火山-侵入岩系三叉裂谷太岳山华北克拉通

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Calcite U-Pb Geochronology Revealing Late Ediacaran-Early Paleozoic Hydrothermal Alteration in the Stenian-Tonian Carbonate of Northeastern North china Craton

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Journal of Earth Science 2023年第6期34卷 1724-1731页

作者： Rong Cao Hanqing zhao Zhongwu Lan state key laboratory of lithospheric evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China College of Earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China state key laboratory of Biogeology and Environmental geology China University of GeosciencesBeijing 100083China state key laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China state key laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430078China

Two calcite LA-ICP-MS U-Pb ages of 534±26 Ma(MSWD=5.9)and 456±43 Ma(MSWD=3.8)were obtained from the Nanfen Formation,Xihe Group in the southern Liaoning Prov-ince,northeastern china,which significantly postdate the theoretical depositional age of sampling *** means they represent timing of post-depositional hydrothermal event possibly induced by syn-chronous far-field magmatism in the South *** of common Pb enriched muddy compo-nents coupled with input of"mantle"-like common Pb could account for the relatively low U contents and high common Pb contents in the dated muddy *** recommend that micro-domains of carbonates are prescreened by rapid in situ carbonate U-Pb geochronology to demonstrate whether they are of primary or secondary origin before utilizing them for chemostratigraphic study.

关键词： carbonates geochronology LA-ICP-MS Xihe Group hydrothermal origin

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Nature and secular evolution of the lithospheric mantle beneath the North china Craton

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Science china Earth sciences 2021年第9期64卷 1492-1503页

作者： Yanjie TANG Jifeng YING Yuepeng zhao Xinrang XU state key laboratory of lithospheric evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China College of Earth and Planetary sciences University of Chinese Academy of SciencesBeijing100049China

The Archean mantle lithosphere beneath the North china Craton(NCC)was transformed in the Mesozoic,leading to the craton *** the significant breakthroughs in the craton studies,lithospheric transformation mechanisms are yet to be fully *** variations of mantle-derived rocks and xenoliths provide insights into the nature of the mantle lithosphere before and after the craton *** Paleozoic lithosphere of the NCC is~200 km *** has a refractory mantle with an evolved isotopic *** Mesozoic mantle lithosphere was relatively fertile and highly *** the Cenozoic,the lithosphere in the eastern NCC is about 60–80 km *** has an oceanic-type mantle that is fertile in composition and depleted in the Sr-Nd isotopic *** Central Zone lithosphere is>100 km thick and has a double-layer mantle with an old upper layer and a new lower *** Western Block has a lithosphere of~200 km *** lithospheric mantle beneath the southern and northern margins and eastern part of the NCC has been transformed significantly by peridotite-melt reactions due to the multiple subductions of adjacent plates since the ***-Pacific subduction and the associated dynamic processes significantly alter the lithosphere based on the distribution of craton *** involved mechanisms include mechanical intrusion of subduction plates,melt/fluid erosion,and local *** lithospheric thinning of~120 km is relevant to the continental extension caused by subduction plate rollback and trench retreat.

关键词： Mantle xenoliths lithospheric mantle transformation Circum-craton subductions Peridotite-melt reaction North china Craton Paleo-Pacific plate

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Major Advances in the Study of the Precambrian geology and Metallogenesis of the North china Craton:A Review

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Acta Geologica Sinica(English Edition) 2016年第4期90卷 1122-1155页

作者： zhao Lei ZHU Xiyan ZHAI Mingguo state key laboratory of lithospheric evolution Institute of Geology and Geophysics Chinese Academy of Science key laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences

The North china Craton （NCC） is one of the most ancient cratons in the world and records a complex geological evolution since the early Precambrian. In addition to recording major geological events similar to those of other cratons, the NCC also exhibits some unique features such as multi- stage cratonization （late Archaean and Palaeoproterozoic） and long-term rifting during the Meso- Neoproterozoic. The NCC thus provides one of the best examples to address secular changes in geological history and metallogenic epochs in the evolving Earth. We summarize the major geological events and metallogenic systems of the NCC, so that the evolutionary patterns of the NCC can provide a better understanding of the Precambrian NCC and facilitate comparison of the NCC with other ancient continental blocks globally. The NCC experienced three major tectonic cycles during the Precambrian：（1） Neoarchaean crustal growth and stabilization; （2） Palaeoproterozoic rifting-subduction-accretion-collision with imprints of the Great Oxidation Event and （3） Meso-Neoproterozoic multi-stage rifting. A transition from primitive- to modern-style plate tectonics occurred during the early Precambrian to late Proterozoic and is evidenced by the major geological events. Accompanying these major geological events, three major metallogenic systems are identified：（1） the Archaean banded iron formation system; （2） Palaeoproterozoic Cu-Pb-Zn and Mg-B systems and （3） a Mesoproterozoic rare earth element-Fe- Pb-Zn system. The ore-deposit types in each of these metallogenic systems show distinct characteristics and tectonic affinities.

关键词： North china Craton geological events metallogenesis cratonization multi-stage rifting

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Mantle dynamics of the reactivating North china Craton:Constraints from the topographies of the 410-km and 660-km discontinuities

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Science china Earth sciences 2011年第6期54卷 881-887页

作者： XU WeiWei ZHENG TianYu zhao Liang Seismological laboratory State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

The topographies of the 410-km and 660-km discontinuities have important implications for mantle *** we present high-resolution seismic imaging of the 410-km and 660-km discontinuities beneath the North china Craton (NCC) employing the receiver function *** anomalies (deeper or shallower than the global average depths) at both discontinuities were detected by introducing a three-dimensional regional velocity *** depressions of the 410-km discontinuity are mostly located in the eastern NCC.A local elevation of the 660-km discontinuity appeared in the northwest of the NCC and a significant depression of the 660-km discontinuity is located in the southeast of the *** dynamic mantle regimes are speculated to explain the formation of the anomalous depth zones in the *** possibility is a complex mantle upwelling linked to edge-derived convection between the stagnant slab and the thick cratonic *** other potential dynamic regime is slab stagnating,sinking,and induced upwelling at the neighboring slab *** regimes hint that the mantle flow was possibly dominated by dynamic interactions among the subducting slab,cratonic root,and ambient mantle beneath the NCC.

关键词： 410-km discontinuity 660-km discontinuity receiver function imaging dynamic mantle regime North china Craton

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Indication from finite-frequency tomography beneath the North china Craton： The heterogeneity of craton destruction

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Science china Earth sciences 2018年第9期61卷 1238-1260页

作者： Xiaobing XU Liang zhao Kun WANG Jianfeng YANG state key laboratory of lithospheric evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China chinese academy of sciences Center for Excellence in Tibetan Plateau Earth sciences Beijing 100101 China

We picked new traveltime residual datasets in three frequency bands （0.02%）. 1,0.1-0.8, and 0.8-2.0 Hz） for P-waves from 793 teleseismic events and two frequency bands （0.02-0.1 and 0.1-0.8 Hz） for S-waves from 310 teleseismic events, recorded by 389 permanent stations of the china National Seismic Network and 832 broadband stations of 10 temporary arrays deployed in the North china Craton （NCC） region. The final datasets are composed of 65628 P-arrivals and 47050 S-arrivals. Based on previous research and our team＇s 2012 tomographic work, we constructed new three-dimensional P-velocity and S- velocity models of the NCC through some improvements, such as augmenting a much denser station coverage in the western NCC, considering the incident angle effect in crustal correction and using a multi-frequency joint inversion tomographic technique. The new velocity models provide several salient features, from which we draw possible inferences on regional dynamic processes. We observed high-velocity anomalies in the mantle transition zone （MTZ）. Obvious morphological het- erogeneities suggest buckling and/or fragmentation of the subducted Pacific slab, and some of the slab materials are visible below 660-kin discontinuities. The velocity structure of the eastern NCC is dominated by small-scale lateral heterogeneities. At shallow depths, high-velocity anomalies beneath the southern part of the eastern NCC and the Yanshan region likely represent a remnant of cratonic lithosphere, which may suggest that the NCC destruction is spatially non-uniform. We also detected a high-velocity anomaly in the Sulu Orogen extending downward to -300 kin, which is seemingly controlled by the Tan-Lu Fault. The northern boundary of this anomaly spatially coincides with the Yantai-Qingdao-Wulian Fault, and is likely a remnant of the Yangtze cratonic lithosphere subducting northwestward. Significant low-velocity anomalies imaged beneath the central NCC show a spatial discordance between their north

关键词： Upper mantle Mantle transition zone Finite frequency Multi-frequency joint inversion Wet upwellings Weak zones

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Heterogeneous destruction of the North china Craton： Coupled constraints from seismology and geodynamic numerical modeling

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Science china Earth sciences 2018年第5期61卷 515-526页

作者： Kun WANG Liang zhao Xiaobing XU Jianfeng YANG state key laboratory of lithospheric evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Institutions of Earth Science Chinese Academy of Sciences Beijing 100029 China

The prevailing academic view regards mantle flow and the metasomatism triggered by the subduction of the Pacific plate as the cause and mechanism for the destruction of the North china Craton(NCC). However, the geodynamic destruction process remains ambiguous, necessitating detailed information at this stage. Combining the structural images obtained by the exploration of dense seismic arrays and the geodynamic simulations inspired by numerical modeling, this paper arrives at the following conclusions: the spatial variation of the P-and S-wave velocities, as well as their velocity ratio in the mantle transition zone, are key evidences of the nonuniform dehydration of the Pacific plate, the subducted plate induces hot upwellings in the mantle transition zone(MTZ), resulting in the heterogeneous distribution of the melt/fluid beneath the craton, characterized by small scale anomalies in the seismic velocity field, and as revealed by dense seismic array observation, the heterogeneities in the upper mantle structure and deformation are the synthetic results of lithospheric strain localization and the heterogeneous distribution of the melt/fluid. It is known that the nonuniform dehydration of the Pacific slab and the heterogeneous distribution of the melt/fluid have occured in the Cenozoic. If these scenarios could have already occurred in the Early Cretaceous, their interaction with the NCC lithosphere would be the dynamic mechanism for the heterogeneous lithospheric destruction of the NCC. The inference in this study is significant for further reconciling the multidisciplinary evidences in the NCC.

关键词： North china Craton Heterogeneity Seismic tomography Numerical modeling

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华南晚中生代大陆变形、深部过程及动力学

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地质学报 2024年第3期98卷 829-861页

作者：李建华董树文赵国春张岳桥辛宇佳王金铭卢运可中国地质科学院地质力学研究所自然资源部古地磁与古构造重建重点实验室北京100081 中国地质科学院地球深部探测中心北京100037 南京大学内生金属矿床成矿机制研究国家重点实验室江苏南京210023 香港大学地球科学系中国香港西北大学地质学系大陆动力学国家重点实验室陕西西安710069

受控古太平洋板块俯冲及后撤作用,华南晚中生代经历了强烈大陆再造,并伴随幕式岩浆活动,是研究活动大陆边缘构造-岩浆作用、壳幔过程和板块俯冲动力学的天然实验室。本文系统综述了近年来发表的构造变形、岩浆作用和深部结构等多学科成... 详细信息

受控古太平洋板块俯冲及后撤作用,华南晚中生代经历了强烈大陆再造,并伴随幕式岩浆活动,是研究活动大陆边缘构造-岩浆作用、壳幔过程和板块俯冲动力学的天然实验室。本文系统综述了近年来发表的构造变形、岩浆作用和深部结构等多学科成果,以构造解析为主线,深-浅结合,在华南识别出与古太平洋板块俯冲相关的中晚侏罗世弧背缩短和白垩纪弧后伸展系统,厘定了二者的时空格架和叠加改造关系。弧背缩短系统以扬子中部的隔档-隔槽式褶皱、深部多层滑脱和双重逆冲推覆构造为特征,具SE向NW的逆冲扩展变形规律,与古太平洋板块的前进式俯冲有关。白垩纪主体以大陆伸展为主,经历了伸展和挤压变形交替,并伴随着岩浆活动的爆发、迁移和停止,其可能与板片俯冲动力学变化有关。在此基础上,我们分析了白垩纪岩石圈长距离伸展的深部过程及浅表响应,提出了岩石圈随深度变化的分层差异伸展模式。自下而上,从岩石圈地幔到上地壳,应变近一致地表现为(W)NW-(E)SE伸展,反映了垂向变形一致性。可能的垂向应力传播过程:板片后撤诱发长距离地幔流,其在岩石圈底部形成剪切牵引应力,促进下岩石圈地幔被动拉伸;上岩石圈地幔局部发育强应变剪切带,作为应力传播构造,其可有效加强壳-幔间剪切,促进下地壳韧性拉伸,将下地壳和岩石圈地幔的变形关联。我们认为岩石圈伸展、板片后撤和地幔流形成了三位一体的动力学耦合系统,将华南岩石圈长距离伸展的驱动力归结为:(1)古太平洋俯冲带海沟后撤和板片回卷诱发的远程效应,和(2)地幔流在岩石圈底部施加的剪切牵引应力。

关键词：华南晚中生代大陆变形岩石圈伸展深部过程浅表响应

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Numerical modeling of metamorphic core complex formation:Implications for the destruction of the North china Craton

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Earth and Planetary Physics 2022年第2期6卷 191-203页

作者： ZiQi Ma Gang Lu JianFeng Yang Liang zhao state key laboratory of lithospheric evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary sciences University of Chinese Academy of SciencesBeijing 100049China

Widespread magmatism, metamorphic core complexes(MCCs), and significant lithospheric thinning occurred during the Mesozoic in the North china Craton(NCC). It has been suggested that the coeval exhumation of MCCs with uniform northwest-southeast shear senses and magmatism probably resulted from a decratonization event during the retreat of the paleo-Pacific Plate. Here we used two-dimensional finite element thermomechanical numerical models to investigate critical parameters controlling the formation of MCCs under far-field extensional stress. We observed three end-member deformation modes: the MCC mode, the symmetric-dome mode, and the pure-shear mode. The MCC mode requires a Moho temperature of ≥700 ℃ and an extensional strain rate of ≥5 × 10^(-16)s^(-1), implying that the lithosphere had already thinned when the MCC was formed in the Mesozoic. Considering that the widespread MCCs have the same northwest-southeast extension direction in the NCC, we suggest that the MCCs are surface expressions of both large-scale extension and craton destruction and that rollback of the paleo-Pacific slab might be the common driving force.

关键词： metamorphic core complex North china Craton numerical modeling extension

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