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中国科学院地质与地球物理研究所2.08学术年会

作者： T.Y.Zheng,L.Zhao,and R.X.Zhu 1 seismological laboratory(SKL-LE),{2. of {3. and Geophysics,chinese academy of sciences,Beijing,china.

[1]The reactivation of craton is a crucial issue for the understanding of continent *** the partial loss of the thick lithospheric root of the North china Craton (NCC) was documented,its mechanism remains a contentious topic in the study of cratonic *** this paper,we imaged the crust-mantle structures by using the data from 3. permanent stations with fine spatial coverage in the Yanshan tectonic belt(YSTB) and the Taihangshan region(TSR) in the northern *** tectonic units with distinct crust-mantle structures were recognized and their junction zone was *** results reveal distinct features of the crust-mantle boundaries of the YSTB and the TSR which are characterized by a sharp interface and a thick transition zone,*** on the analysis of the seismic structures of the crust-mantle boundary and the upper mantle,we propose that the NCC reactivation was possibly derived by a slow secular ascension of hydrated asthenospheric material atop the stagnant Pacific slab,which influenced the formation of crust-mantle transition zone in the eastern *** the other hand, regional delamination of the deep crust after orogenic thickened and/or magmatic underplating beneath the YSTB caused the spatial variation of the crust-mantle boundary. Both of the mantle processes possibly changed the nature of the lithospheric mantle.

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Insight into craton evolution:Constraints from shear wave splitting in the North china Craton

Insight into craton evolution:Constraints from shear wave sp...

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中国科学院地质与地球物理研究所2.08学术年会

作者： Liang Zhao~*,Tianyu Zheng,Gang L(u|¨) seismological laboratory(SKL-LE),{2. of {3. and Geophysics,chinese academy of sciences,Beijing 10002.,china

The multi-episodic tectonic activities from the Precambrian to Cenozoic,including nucleus formation, cratonic amalgamation,and rejuvenation,make the North china Craton(NCC) an ideal natural laboratory for studying craton *** change in the upper deformation records is an important aspect for understanding cratonic formation and *** this study,we performed seismic shear wave splitting analysis using SKS phases from 50 portable *** different methodologies,shear wave splitting measurement and amplitude analysis of transverse/radial components,produced mutually consistent splitting *** results showed that the seismic anisotropy beneath the Ordos Block can be divided into three subgroups reflecting the tectonic *** these results with those from previous splitting studies in the eastern NCC,we suggest that the Proterozoic amalgamation generated the seismic anisotropy in the boundary zone between the Ordos Block and the Trans-North china Orogen, while the anisotropy in the eastern Trans-North china Orogen and eastern NCC were possibly associated with the lithospheric rejuvenation during the Late Mesozoic to Cenozoic.

关键词： North china Craton Upper mantle Seismic anisotropy Shear wave splitting

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Linking the Sulu UHP belt to the Korean Peninsula:Evidence from eclogite,Precambrian basement,and Paleozoic sedimentary basins

Linking the Sulu UHP belt to the Korean Peninsula:Evidence f...

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中国科学院地质与地球物理研究所2.07学术年会

作者： Mingguo Zhai~(a,b,*),Jinghui Guo~(a,b),Zhong Li~a,Daizhao chen~a,Peng Peng~a,Tiesheng Li~a, Quanlin Hou~c,Qicheng Fan~d a {2. of {3. and Geophysics,and Key laboratory of Mineral Resources,chinese academy of sciences,Beijing,10002.,china b chinese State Key laboratory of Lithosphere Evolution,china c Graduate University,chinese academy of sciences,china d {2. of {3.,chinese seismological Bureau,china

Considerable debate on whether and how the Sulu Orogenic Belt extends eastward to the Korean Peninsula has remained over the past decade. New results reported here include the following:(1) an eclogite and retrograded eclogite-bearing complex(Hongseong Complex) is discovered in South Korea,in which the eclogite occurs as lenses in circa～810-82. Ma granitic *** zircon dating of the eclogite yields～2.0 Ma for the metamorphic age and～880 Ma for the protolith age;(2. The basement of the Rangnim,Gyeonggi and Yeongnam massifs have affinities to, the basement of the North {3. Block(NCB).However the Gyeonggi Massif encloses a minor amount of large or small slabs of the Hongseong Complex that are similar to the rocks of the Sulu Belt.(3. Two main Paleozoic basins within the Rangnim and Gyeonggi massifs have a similar Paleozoic tectono-stratigraphy to the NCB.(4) The Imjingang and Ogcheon belts do not exhibit any metamorphic characteristics of collisional orogenic *** on these facts,we propose a crustal-detachment and thrust model and suggest that the collision belt between the Yangtze Block(YB) and NCB(Sino-Korea Craton) is preserved along the western margin of the Korean *** lower part of the UHP metamorphosed lithosphere of the YB was subducted under the Korean Peninsula and not uplifted to the *** lower crust of the YB(the Hongseong Complex) was detached from the subducted lithosphere and thrust over the Korean Peninsula,and inserted into the basement rocks of the Gyeonggi *** upper crust of the YB possibly was detached from the lower crust and overthrusted along the Honam and Chugaryong shear *** Imjingang and Ogcheon belts possibly represent the detached upper crust of YB and their present occurrences are controlled by a Mesozoic strike-slip shear *** these detached lower and upper crustal slabs were strongly deformed during the Late Jurassic and Early Cretaceous tectonic event leading to their present geologi

关键词： Korean Peninsula Sulu Belt Tectonic link Evidences Geotectonic significance

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北京地区一批地质样品的C14年代测定

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地质科学 1980年第2期2卷 201-202页

作者： Radiocarbon Dating laboratory, institute ofArchaeology, {2. {3. of Sociologyand Radiocarbon Dating Lalioratory, institute ofgeology, State seismological Bureau 国家地震局地质研究所C~(14)实验室中国社会科学院考古研究所C~(14)实验室

我们于1974年,1977—1978年测定了北京地区全新世和晚更新世54个样品的C年代数据。其中,考古研究所C实验室测定了3.个样品(标本由陈方吉、张子斌、孙秀萍等提供,编号ZK),有6个数据已发表;国家地震局地质研究所C实验室测定了2.个样品(标... 详细信息

我们于1974年,1977—1978年测定了北京地区全新世和晚更新世54个样品的C年代数据。其中,考古研究所C实验室测定了3.个样品(标本由陈方吉、张子斌、孙秀萍等提供,编号ZK),有6个数据已发表;国家地震局地质研究所C实验室测定了2.个样品(标本由本实验室和一○一地质队等采集,编号CG),有4个样品的数据已发表。现将44个样品的C年代数据列于下表。

关键词：地质样品孔距年代测定木炭固体燃料 ZK 井距地表地球表面小王庄延庆国家地震局地质研究所北京

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Insight into modification of North china Craton from seismological study in the Shandong Province

Insight into modification of North China Craton from seismol...

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中国科学院地质与地球物理研究所2.08学术年会

作者： T.Y.Zheng,L.Zhao,W.W.Xu,and R.X.Zhu 1 seismological laboratory(SKL-LE),{2. of {3. and Geophysics,chinese academy of sciences,Beijing,china.

[1]The study region is located in the southeast edge of the North china Craton(NCC),which is an Archean craton that underwent removal and modification of the lithospheric mantle during the Late Mesozoic-Cenozoic. Teleseismic data from the NCISP-1 experiment were used to image the velocity structures in lithosphere and to investigate the upper mantle *** results revealed that the present lithosphere consists of two parts with different structural features throughout,including crustal fabric,lithospheric velocity stratification,and anisotropic *** formation of the contrasting structure is attributable to one of two possibilities:the trans-lithospheric Tanlu fault zone(TLFZ) operated as an asthenospheric upwelling channel and facilitated the NCC reactivation,or the TLFZ separates the study region into two lithospheric blocks,with the ancient lithospheric materials remaining within the rejuvenated lithospheric *** two possibilities suggest that thermal/ chemical erosion may have played critical roles in the NCC reactivation.

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A two-dimensional hybrid method for modeling seismic wave propagation in anisotropic media

A two-dimensional hybrid method for modeling seismic wave pr...

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中国科学院地质与地球物理研究所2.08学术年会

作者： Liang Zhao,Lianxing Wen,ling chen,and Tianyu Zheng 1 {2. {3.,institute of geology and Geophysics, chinese academy of sciences,Beijing,china. 2.Department of Geosciences,State University of New York at Stony Brook,Stony Brook,New York,USA.

[1]A hybrid method is developed for calculating synthetic seismograms for seismic waves propagating in two-dimensional localized heterogeneous anisotropic media. The hybrid method is a combination of analytic and numerical methods,with the numerical method(finite difference,or FD) applied in the heterogeneous anisotropic region only and the analytic method(generalized ray theory,or GRT) *** GRT solutions from a seismic source are interfaced with the FD calculation at the boundaries of the anisotropic region;and seismic responses at the Earth’s surface are obtained from the output of FD *** experiments on both isotropic and anisotropic models demonstrate the validity of the new method in simulating seismic wave propagation in complex *** applied the hybrid method to study the SKS wave propagation in the upper *** calculated the synthetics for a series of laterally varying anisotropic models,including a layer with varying anisotropy,two-layer anisotropy,separated anisotropic body and those may be related to subduction *** these laterally varying models,SKS waveforms exhibit higher sensitivity to the spatial variation of anisotropy than the shear wave splitting parameters *** results of this study demonstrate the potential of the proposed hybrid method for high-resolution imaging the laterally varying anisotropic structures from seismological observations, when the tectonic structures can be approximated as two-dimensional.

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A Study of the Crustal Stability in the Yangtze Three Gorges Area

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工程科学（英文版） 2003年第1期1卷 23-31,56页

作者： Li Ping 1, Li Yuanjun 2.(1 institute of geology, {2. seismological Bureau, Beijing 10002.) (2.College of Civil Construction Engineering, Wuhan University, Wuhan 43.072.

The Three Gorges Dam on the Yangtze River is situated on the intact rock mass composed of diorite granite at the southern termination of the Huangling block which, as a sub plate with a double layer structure (crystalline basement and sedimentary cover) in the chinese inland, keeps a constant but slow uplift as a whole since its formation in the Indoncisia movement. Tectonic deformation within the block is not significant, with the exception of a slight southeastward tilt. The block is confined by many active structures, of which the sub longitudinal Yuanan and Xiannvshan ( Mount Fairy ) deep fault zones are the main strongly seismogenic zones. The Yuan’an fault zone represents a regional boundary among West Henan, West Hubei and West Hunan mountainous regions as well as the Nanyang, Jianghan and Dongting Lake basins, with a total length of more than 1,000 km. Two M 6 5 earthquakes (in Changde and Nanyang) occurred in the fault zone in historic time and the distance between the two epicenters is about 500 km. The Mount Fairy fault zone extends northward along the Xiangxi River and ends at the Qingfeng fault. It runs a total length of more than 2.0 km. southward across Yuyang Pass and then its trace is unknown. The fault zone has a tectonic condition for occurrences of M 6.0 earthquakes. The possible seismic risk for the dam may come from these two strong seismogenic zones. Thus the seismic intensity to influence the dam is estimated to be Ⅵ～Ⅶ and the horizontal peak acceleration to be 0 1～0 15 g.

关键词： Three Gorges Dam on the Yangtze Huangling block strong seismogenic zone crustal stability

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Mesozoic Replacement of Bottom Crust in North china Craton:anorogenic mantle-crust interaction

Mesozoic Replacement of Bottom Crust in North China Craton:a...

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中国科学院地质与地球物理研究所2.02.术年会

作者： Mingguo ZHAI~a Qicheng FAN~b Wenjun LIU~a. a.institute of {2. and Geophysics,{3.,Beijing 10002. b.institute of {2.,china seismological Bureau,Beijing 10002.

The study of Precambrian granulite terrain in the North china craton and the granulite xenoliths in Cenozoic volcanic rocks shows that there are differences between the Precambrian lower crust and the present *** study further shows that the Mesozoic tectonic inversion in the North china craton not only causes changes in basin-range system but also changes in the composition and texture of the lower crust and upper *** have been many models suggested,such as delamination,mantle-root structure etc,for the mechanism of thinning of the eastern lithosphere,all related to the evolution of orogenic *** have noted in our work that most or all of the lowermost crust of the North china craton has been substituted by the Mesozoic lower *** has been occurred not only the edge of but also within the ***,the processes of the North china craton mantle uplifting and the quick thinning of the Paleozoic lithosphere may be seen as the replacement of bottom crust in the North china *** upwelling mantle plume possibly existed during Jurrasic-Cretaceous,and strong crust-mantle interaction is a major way of replacement of bottom crust,while the details of thermal and chemical corrosion is still not ***,it may be inferred that this has no direct relationship with the evolution of orogenic belt and is different from the lithosphere delamination at the root of orogenic belt.

关键词： Mesozoic lower crust replacement of bottom crust North china

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Experimental study on the P wave velocity in rocks from lower crust and crust-mantle transitional zone beneath the Hannuoba

Experimental study on the P wave velocity in rocks from lowe...

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中国科学院地质与地球物理研究所2.02.术年会

作者： Fan Qicheng~(a,b) Sui Jianli~(a,b) Zhang Hongfu~a Zhai Mingguo~a Xie Hongsen~c a.institute of {2. and Geophysics,{3. academy of Science,Beijing 10002.,china b.institute of {2.,china seismological Bureau,Beijing 10002.,china c.institute of Geochemistry,chinese academy of sciences,Guiyang 550002.china

Cenozoic basalt-borne mafic granulite-facies plagioclase pyroxenite and eclogite-facies garnet pyroxenite xenoliths from the Hannuoba,as well as nearby Archean terrain granulites,are selected for the experimental study on the P wave velocity at high temperature and high pressure in order to reveal the present-day compositional features for the lower crust and crust-mantle transitional *** show that mafic xenoliths have high Vp(7.0～8.0 km/s),in contrast,the Archean terrain granulites have low Vp(<7.0 km/s).High Vp mafic xenoliths can represent the present-day compositional features for the lower crust and crust-mantle transitional zone beneath the *** provides new evidence for the crust vertical growth and the formation of the crust-mantle transitional zone resulted from the magma *** Vp Archean granulite still remains the characteristics of the early lower crust.

关键词： lower crust and crust-mantle transitional zone mafic xenolith wave velocity Hannuoba

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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2.07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 {2. and Geophysics,{3.,Beijing,10002.,china b Key laboratory of Mineral Resources.{3.,Beijing,10002.,china c institute of {2.,{12. {13. Bureau.Beijing,10002.,china d State Key laboratory of Lithosphere Tectonic Evolution,Beijing,10002.,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 80-12. 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 140-12. *** 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 upwel{3. 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 80-12. 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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