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华北克拉通北缘显生宙四次底侵作用及其构造岩浆活动与深部背景

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地学前缘 2020年第4期27卷 124-134页

作者：邵济安周新华张履桥造山带与地壳演化教育部重点实验室北京大学地球与空间科学学院北京100871 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 中国科学院大学地球与行星科学学院北京100049 内蒙古地质研究所内蒙古呼和浩特010020

通过对华北克拉通北缘显生宙四次(p1,T3,J1,K1)底侵作用的研究,将华北克拉通的活化与岩石圈深部地幔物质的底辟体上涌联系起来。不同阶段底侵作用在岩浆来源深度、与构造格局关系、对地壳垂向增生的贡献、幔源物质脉动式上涌等方面的差... 详细信息

通过对华北克拉通北缘显生宙四次(p1,T3,J1,K1)底侵作用的研究,将华北克拉通的活化与岩石圈深部地幔物质的底辟体上涌联系起来。不同阶段底侵作用在岩浆来源深度、与构造格局关系、对地壳垂向增生的贡献、幔源物质脉动式上涌等方面的差异与变化,显示它们是一个分阶段连续热演化的深部过程,其动力学机制是深部的高热流和地幔物质的向上运移。对应于地幔物质上涌,必然存在同期的地幔底辟体隆起的岩石圈结构变化。通过对华北中生代盆山系形成机制的讨论,认为该区高分辨率面波层析成像所显示的地幔底辟体上涌的特征可以反映中生代岩石圈底侵作用的深部背景。

关键词：华北克拉通北缘显生宙底侵作用地幔底辟体上涌

A Synthesis of Geophysical Data in Southeastern North china Craton:Implications for the Formation of the Arcuate Xuhuai Thrust Belt

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Journal of Earth Science 2022年第3期33卷 552-566页

作者： Yangfan Deng Yun Chen pengfei Li zhou zhang JoséBadal state key laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China state key laboratory of lithospheric evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China physics of the Earth Sciences BUniversity of ZaragozaPedro Cerbuna 1250009 ZaragozaSpain

The Xuhuai fold thrust belt(XHTB)is a curved structure in the southeastern margin of the North china Craton(NCC)that has attracted great attentions due to its tectonic and petrological ***,few geophysical studies have focused on the deep structure of this *** this study,we carry out a systematic demonstration of the main geophysical features that characterize the XHTB and surrounding *** results reveal small negative gravity and magnetic anomalies,thin crust and lithosphere,lower shear velocity and shallower earthquake epicenters relative to other areas of the NCC,collectively indicating a lithospheric-scale rheological anomaly at this *** magnetic alignments show a trend similar to that of geological units in southeastern NCC and adjacent areas,although they differ from the SKS-splitting fast polarization directions,except in the Qinling-Dabie orogen where a vertical coherent deformation of the crust and mantle may be involved *** on the geophysical data,we propose a detachment-controlled model,which was caused by the different detachment depth/strength,for the formation of XHTB to explain its arcuate shape as well as the magnetic alignments,thus providing new insight into the deep processes of southeastern NCC.

关键词： gravity and magnetic anomalies shear wave velocity seismicity seismic anisotropy magnetic alignments arcuate structure

造山带橄榄岩岩石学与构造过程:以松树沟橄榄岩为例

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地球科学 2019年第4期44卷 1057-1066页

作者：张宏福于红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 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

造山带橄榄岩不仅是地幔地球化学,而且是造山带形成与演化过程研究的主要对象.造山带橄榄岩主要有3种类型:(1)阿尔卑斯型橄榄岩,即岩石圈地幔构造-热侵位就位于造山带浅部地壳的橄榄岩;(2)前期层状基性-超基性堆晶岩经俯冲变质形成的橄... 详细信息

造山带橄榄岩不仅是地幔地球化学,而且是造山带形成与演化过程研究的主要对象.造山带橄榄岩主要有3种类型:(1)阿尔卑斯型橄榄岩,即岩石圈地幔构造-热侵位就位于造山带浅部地壳的橄榄岩;(2)前期层状基性-超基性堆晶岩经俯冲变质形成的橄榄岩;(3)蛇绿岩型橄榄岩.松树沟糜棱岩化橄榄岩及其相关高级变质岩详细的岩石学和地球化学研究发现这些橄榄岩记录了洋岩石圈形成到角闪岩相变质的全过程.即1 000～800 Ma洋岩石圈形成阶段,主要形成纯橄岩;<800～500Ma洋-陆转换即陆岩石圈演化阶段,岩石圈被交代形成大量方辉橄榄岩;500～480 Ma快速深俯冲和榴辉岩相变质阶段;460～335Ma角闪岩相退变质阶段,此阶段在松树沟橄榄岩中形成大量富镁的直闪石类矿物,包括透闪石、阳起石和镁闪石.由此可见,蛇绿岩型造山带橄榄岩能够记录造山带形成与演化的全过程,通常会经历4个形成和演化阶段:(1)洋岩石圈(蛇绿岩)形成阶段,形成纯榄岩;(2)洋-陆转换阶段,陆岩石圈演化阶段,岩石圈受交代形成方辉橄榄岩;(3)岩石圈深俯冲,榴辉岩相变质;(4)俯冲板片抬升至角闪岩相时退变质,此时在橄榄岩中形成富镁的直闪石类矿物.不同造山带中蛇绿岩型橄榄岩的区别可能只是俯冲深度和退变质程度不同而已.最后,蛇绿岩一定要强调是什么时代的蛇绿岩.同时,造山带进变质作用产物经常会被后期抬升过程中退变质作用彻底改造,这应该引起重视.

关键词：造山带橄榄岩交代方辉橄榄岩岩石圈深俯冲角闪岩相退变质蛇绿岩岩石学

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对内蒙古贺根山蛇绿岩的新认识

岩石学报 2019年第9期35卷 2864-2872页

作者：邵济安张丽莉周新华张履桥唐克东造山带与地壳演化教育部重点实验室北京大学地球与空间科学学院北京100871 中国科学院地质与地球物理研究所中国科学院油气资源研究重点实验室北京100029 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 中国科学院大学地球与行星科学学院北京100049 内蒙古地质研究所呼和浩特010020 沈阳地质矿产研究所沈阳110034

本文将华北板块和中亚-蒙古陆块缝合带中前人划分的"贺根山蛇绿岩套"划分为三个不同组分、不同成因的岩系:以含金刚石和其它幔源矿物的变质橄榄岩系为主,包括堆晶杂岩在内的镁铁-超镁铁岩系;含放射虫硅质岩夹层的玄武岩系;上覆的火山-... 详细信息

本文将华北板块和中亚-蒙古陆块缝合带中前人划分的"贺根山蛇绿岩套"划分为三个不同组分、不同成因的岩系:以含金刚石和其它幔源矿物的变质橄榄岩系为主,包括堆晶杂岩在内的镁铁-超镁铁岩系;含放射虫硅质岩夹层的玄武岩系;上覆的火山-沉积岩系。根据地质学与年代学证据,可以认为蛇绿岩形成于晚泥盆-早石炭世。在此基础上,本文重点讨论了三个问题:(1)结合不同尺度的构造研究,将含金刚石等幔源矿物的超镁铁岩看作源自地幔转换带的幔源熔-流体,在软流圈底辟体上涌的背景下持续上升,在板块对接的过程中构造侵位的岩石。据此,对现有的蛇绿岩概念提出了补充;同时提出贺根山在板块汇聚过程未发生明显的俯冲和碰撞,而是通过拼贴的方式连为一体的;(2)贺根山具有oIB特征的玄武岩与朝克山MoRB的对比,表明不同来源的多地块的存在及板块闭合时间的差异均反映了陆间小洋盆的特征;(3)将上覆在玄武岩系之上的火山沉积岩系看作洋盆最后充填的产物,反映了古亚洲洋闭合过程中小洋盆直接从洋壳转化为陆壳的过程,最后从时空角度进一步讨论了小洋盆闭合的特征。

关键词：缝合带镁铁-超镁铁岩玄武岩上覆岩系小洋盆闭合贺根山

贺根山镁铁-超镁铁岩与缝合带的关系——来自地球物理的证据

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地球物理学报 2020年第5期63卷 1867-1877页

作者：邵济安张丽莉周新华张履桥唐克东北京大学造山带与地壳演化教育部重点实验室地球与空间科学学院北京100871 中国科学院地质与地球物理研究所中国科学院油气资源研究重点实验室北京100029 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 中国科学院大学地球与行星科学学院北京100049 内蒙古地质研究所呼和浩特010020 沈阳地质矿产研究所沈阳110034

长期以来,对内蒙古贺根山缝合带中的镁铁-超镁铁岩,有着“蛇绿岩”、“岩浆岩”、“幔源熔-流体”等不同认识.近年来在铬铁矿中发现了金刚石等深部地幔矿物,如何认识携带这些物质的幔源熔-流体的上涌?缝合带在镁铁-超镁铁岩的形成过程... 详细信息

长期以来,对内蒙古贺根山缝合带中的镁铁-超镁铁岩,有着“蛇绿岩”、“岩浆岩”、“幔源熔-流体”等不同认识.近年来在铬铁矿中发现了金刚石等深部地幔矿物,如何认识携带这些物质的幔源熔-流体的上涌?缝合带在镁铁-超镁铁岩的形成过程中起到什么作用?解决问题的关键之一是弄清镁铁-超镁铁岩的深部产状,这需要来自地球物理观测数据的依据.本文基于航磁和重力数据的研究表明,贺根山地区的蛇绿岩块均呈现高磁异常特征,其中贺根山岩块埋深明显大于其他岩块,表现为高磁异常与低重力异常,与地表出露的蛇纹石化的镁铁-超镁铁岩带对应.对航磁化极异常与布格重力异常数据做了向上延拓处理,进行了磁源形态及底界深度的估算,并利用基于相异度算子的边缘增强方法辅助识别断裂.结果表明,贺根山岩块贯穿地壳,且附近存在超壳断裂.地表至中地壳主要由蛇纹石化的镁铁-超镁铁岩组成,下地壳主要为超镁铁质岩组成,它们充填在一组宽约30 km的NEE向断裂带中,大地电磁测深剖面揭示的壳-幔电性结构进一步证实控制缝合带的是岩石圈断裂,贺根山缝合带具有明显的根部.由此推测,在地幔底辟上涌的背景下,幔源熔-流体沿着岩石圈断裂持续上升到达浅表,暗示该区板块的拼合可能是通过深部幔源物质的侵入而成的.

关键词：缝合带镁铁-超镁铁岩航磁异常重力异常向上延拓幔源熔-流体

Iron isotope evidence for multistage melt-peridotite interactions in the lithospheric mantle of eastern china

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Iron isotope evidence for multistage melt-peridotite interac...

An origin of ultraslow spreading ridges for the Yarlung-Tsangpo ophiolites

中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Xinmiao Zhao hongfu zhang Xiangkun Zhu Suohan Tang Bin Yan state key laboratory of Lithopheric evolution Institute of Geology and GeophysicsChinese Academy of Sciences laboratory of Isotopic geology MLRInstitute of GeologyChinese Academy of Geological Sciences

Iron isotopic data of the Cenozoic alkaline basalts and peridotite xenoliths entrained in the Cenozoic and Mesozoic basalts,eastern china,are reported to further constrain the Fe isotopic composition of the mantle and investigate the behavior of Fe isotopes during mantle *** Cenozoic alkaline basalts show limited variation in δFe that are within the ranges of oceanic basalts,which indicate homogeneous Fe isotope composition of the *** lherzolites from the South china Block also display a limited Fe isotopic variation δFe of 0.041 to 0.077‰ and an average of 0.060‰±0.029‰(2 SD).This Fe isotopic composition is similar to that of the bulk silicate Earth,indicating that these samples represent mantle residues that underwent just limited degrees of partial *** contrast,both the mantle peridotites and their mineral separates from the North china Craton exhibit an extremely large Fe isotopic variation with δFe ranging from—1.002‰ to 0.232‰.This may reflect heterogeneous Fe isotopic compositions of the lithospheric mantle beneath the North china *** average δFe(—0.066‰) calculated from all the mantle xenoliths in this study is obviously lower than the average value(0.198‰) of δFe for the Cenozoic alkaline basalts,consistent with the previous observation that basalts generally have heavier Fe isotopes than mantle *** individual minerals, δFe of the olivines(—0.997 to 0.154‰) are systematically lighter than those of the coexisting pyroxenes (—0.718 to 0.169‰for orthopyroxene and—0.642 to 0.304‰for ***). phlogopite of apparently metasomatic origin has the heaviest iron isotopic composition amongst the mineral phases with δFe of 0.302 to 0.376‰.Extreme Fe isotope variation in these peridotites,in particular for the wehrlites,was probably produced by multistage melt-peridotite interactions,consistent with the petrological observation that some of the xenoliths analyzed such as wehrlites were the products of extens

关键词： Iron isotope Mantle xenoliths Melt-peridotite interaction lithospheric mantle Eastern china

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Fundamental Research 2022年第1期2卷 74-83页

作者： Chuan-zhou Liu Fu-Yuan Wu Tong Liu Chang zhang Wei-Qi zhang Zhen-Yu zhang Zhen zhang Wu Wei Yin-Zheng Lina state key laboratory of lithospheric evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China University of chinese academy of sciences Beijing 100049China

As relics of ancient ocean lithosphere,ophiolites are the most important petrological evidence for marking the sutures and also play a key role in reconstructing plate *** also provide valuable windows for studying crustal accretion and mantle processes occurring at modem ocean *** ophiolites are distributed along the Yarlung-Tsangpo suture and represent the relics of ocean lithosphere of the *** are characterized by an incomplete litho-stratigraphy,of which the mantle section is much thicker than the crustal *** crustal rocks outcropped in the Yarlung-Tsangpo ophiolites are much thinner than normal ocean crusts(~7 km)or even *** settings from which the Yarlung-Tsangpo ophiolites originated remain highly controversial,although an origin of the supra-subduction zone is ***,their incomplete litho-stratigraphy has been commonly attributed to tectonic dismemberment during the late-stage emplacement after their ***,such an incompleteness resembles the ocean lithosphere generated at modem ultraslow spreading ridges,such as the Southwest Indian Ridge(SWIR).In this paper,we present several lines of evidence that support the formation of the Yarlung-Tsangpo ophiolites at ultraslow spreading ridges,during which detachment faults were *** suggests that the Yarlung-Tsangpo ophiolites might represent the ocean core complexes(oCC)in the Neo-Tethys *** oCC with high topography in the seafloor were clogged in the trench and preserved as ophiolites through Indo-Eurasia *** clogging resulted in the demise of an old subduction and a new subduction was re-initiated beneath the clogged oCC.

关键词： Yarlung-Tsangpo ophiolites Tibetan plateau Ultraslow spreading ridges Subduction re-initiation

Destruction of the North china Craton

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Destruction of the North China Craton

实时在线氧校正^(205)pb-^(233)U-^(236)U稀释剂单颗粒锆石ID-TIMS U-pb高精度年龄测定方法

中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： ZHU RiXiang XU YiGang ZHU Guang zhang hongfu XIA QunKe ZHENG TianYu state key laboratory of lithospheric evolution Institute of Geology and GeophysicsChinese Academy of Sciences state key laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences School of Resource and Environmental Engineering Hefei University of Technology School of Earth and Space sciences University of Science and Technology of China

A National Science Foundation of china(NSFC) major research project,Destruction of the North china Craton(NCC),has been carried out in the past few years by chinese scientists through an m-depth and systematic observations,experiments and theoretical analyses,with an emphasis on the spatio-temporal distribution of the NCC destruction,the structure of deep earth and shallow geological records of the craton evolution,the mechanism and dynamics of the craton *** this work the following conclusions can be drawn:(1) Significant spatial heterogeneity exists in the NCC lithospheric thickness and crustal structure,which constrains the scope of the NCC destruction.(2) The nature of the paleozoic,Mesozoic and Cenozoic sub-continental lithospheric mantle(CLM) underneath the NCC is characterized in *** terms of water content,the late Mesozoic CLM was rich in water,but Cenozoic CLM was highly water deficient.(3) The correlation between magmatism and surface geological response confirms that the geological and tectonic evolution is governed by cratomc destruction processes. (4) pacific subduction is the main dynamic factor that triggered the destruction of the NCC,which highlights the role of cratomc destruction in plate tectonics.

关键词： NSFC major research project research progress craton destruction North china Craton

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岩石学报 2022年第12期38卷 3695-3702页

作者：储银许俊杰凌潇潇张普程海郭敬辉周新华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 中国科学院地球科学研究院北京100029 西安交通大学全球环境变化研究院西安712000

单颗粒锆石化学溶蚀同位素稀释热电离质谱(CA-ID-TIMS)U-pb法是目前精度最高的同位素地质年代学方法,由于存在^(236)U ^(16)o ^(18)o^(+)和^(236)U ^(18)o ^(16)o^(+)对^(238)U ^(16)o_(2)^(+)的干扰问题,目前国际上通用的U-pb定年稀释剂是^(205)pb-^(233)U-235 U而不采用^(205)pb-^(233)U-^(236)U。针对该问题,本文详细探讨了热电离质谱法(TIMS)测定U同位素过程中,^(236)U ^(16)o ^(18)o^(+)和^(236)U ^(18)o ^(16)o^(+)对^(238)U ^(16)o_(2)^(+)的干扰对U-pb年龄测定结果的影响程度,指出ID-TIMS U-pb分析过程中控制^(233)U-^(236)U稀释剂的加入量,保证样品-稀释剂^(238)U/^(236)U混合比>0.5,^(236)U ^(16)o ^(18)o^(+)和^(236)U ^(18)o ^(16)o^(+)对^(238)U ^(16)o_(2)^(+)的干扰对定年结果的影响并不显著。此外,详细探讨了热电离质谱(TIMS)U、pb同位素测定过程中二次电子倍增器(SEM)死时间的准确设定对高精度CA-ID-TIMS U-pb定年的重要性。在此基础上,建立了在线氧校正^(205)pb-^(233)U-^(236)U稀释剂CA-ID-TIMS单颗粒锆石U-pb年龄高精度测定方法。最后,采用所建立方法对标准锆石ZS进行了测定,获得的^(206)pb/^(238)U年龄加权平均值为559.91±0.25Ma(2σ,仅分析误差),与文献报道值在误差范围内一致。由于采用了^(233)U-^(236)U双稀释剂内部校正U同位素分馏效应,该标样年龄测定精度达到0.05%,优于其^(205)pb-^(235)U单稀释剂法年龄测定结果的精度。

关键词：同位素稀释热电离质谱法铀-铅定年锆石双稀释剂