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Lithospheric structure and faulting characteristics of the Helan Mountains and Yinchuan Basin： Results of deep seismic reflection profiling

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Science China Earth Sciences 2017年第3期60卷 589-601页

作者： LIU BaoJin feng shaoying JI JiFa WANG ShuaiJun ZHANG JianShi YUAN HongKe YANG GuoJun Geophysical Exploration Center of China Earthquake Administration Zhengzhou 450002 China

The Helan Mountains and Yinchuan Basin （HM-YB） are located at the northern end of the North-South tectonic belt, and form an intraplate tectonic deformation zone in the western margin of the North China Craton （NCC）. The HM-YB has a complicated history of formation and evolution, and is tectonically active at the present day. It has played a dominant role in the complex geological structure and modem earthquake activities of the region. A 135-km-long deep seismic reflection profile across the HM-YB was acquired in early 2014, which provides detailed information of the lithospheric structure and faulting characteristics from near-surface to various depths in the region. The results show that the Moho gradually deepens from east to west in the depth range of 40-48 km along the profile. Significant differences are present in the crustal structure of different tectonic units, including in the distribution of seismic velocities, depths of intra-cmstal discontinuities and undulation pattern of the Moho. The deep seismic reflection profile further reveals distinct structural characteristics on the opposite sides of the Helan Mountains. To the east, The Yellow River fault, the eastern piedmont fault of the Helan Mountains, as well as multiple buried faults within the Yinchuan Basin are all normal faults and still active since the Quaternary. These faults have controlled the Cenozoic sedimentation of the basin, and display a ＂negative-flower＂ structure in the profile. To the west, the Bayanhaote fault and the western piedmont fault of the Helan Mountains are east-dipping thrust faults, which caused folding, thrusting, and structural deformation in the Mesozoic stratum of the Helan Mountains uplift zone. A deep-penetrating fault is identified in the western side of the Yinchuan Basin. It has a steep inclination cutting through the middle-lower crust and the Moho, and may be connected to the two groups of faults in the upper crest. This set of deep and shallow fault system con

关键词： North China Craton Deep seismic reflection profile Lithospheric structure Helan Mountains Yinchuan Basin

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High-resolution crustal structure of the Yinchuan basin revealed by deep seismic reflection profiling:implications for deep processes of basin

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Earthquake Science 2016年第2期29卷 83-92页

作者： Xing fuHuang shaoying feng Rui Gao Wenhui Li Key Laboratory of Earthprobe and Dynamics MLRInstitute of GeologyChinese Academy of Geological SciencesBeijingChina Geophysical Exploration of China Earthquake Administration ZhengzhouChina

The Yinchuan basin, located on the western margin of the Ordos block, has the characteristics of an active continental rift. A NW-striking deep seismic reflection profile across the center of Yinchuan basin precisely revealed the fine structure of the crust. The images showed that the crust in the Yinchuan basin was characterized by vertical stratifications along a detachment located at a two-way travel time（TWT） of 8.0 *** most outstanding feature of this seismic profile was the almost flat Mohorovicˇic′ discontinuity（Moho） and a high-reflection zone in the lower crust. This sub-horizontal Moho conflicts with the general assumption of an uplifted Moho under sedimentary basins and continental rifts, and may indicate the action of different processes at depth during the evolution of sedimentary basins or *** present a possible interpretation of these deep processes and the sub-horizontal Moho. The high-reflection zone, which consists of sheets of high-density, mantlederived materials, may have compensated for crustal thinning in the Yinchuan basin, leading to the formation of a sub-horizontal Moho. These high-density materials may have been emplaced by underplating with mantlesourced magma.

关键词： Yinchuan basin Deep seismic reflection section Deep process Magma underplating Moho

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Crustal Structure of the Chuan-Dian Block Revealed by Deep Seismic Sounding and its Implications for the Outward Expansion of the East Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2022年第6期96卷 1932-1944页

作者： XIONG Xiaosong WANG Guan LI Qiusheng LU Zhanwu GAO Rui feng shaoying WU Guowei SinoProbe Center Chinese Academy of Geological SciencesBeijing 100037China Key Laboratory of Deep-Earth Dynamics of the Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China School of Earth Science and Geological Engineering Sun Yat-Sen UniversityGuangzhou 510275China Geophysical Exploration Center Chinese Earthquake AdministrationZhengzhou 450002China

The Chuan-Dian Block(CDB)is located in the southeastern margin of the Tibetan Plateau,with a complex geological structure and active regional *** present tectonic condition with strong crustal deformation is closely related to the ongoing collision of the India and Eurasia plates since 65 *** study of the crustal structure of this area is key to revealing the evolution and deep geodynamics of the lateral collision zone of the Tibetan *** seismic sounding is the most efficient method with which to unravel the velocity structure of the whole *** the 1980s,19 deep seismic sounding profiles have been captured within the CDB *** this study,we systematically integrate the research results of the 19 profiles in this area,then image the 3D crustal velocity,by sampling with a 5 km spacing and 2D/3D Kriging *** results show the following.(1)The Moho depth in the study area deepens from 30 km in the south to 66 km in the north,whereas there is no apparent variation from west to *** Pn wave velocity is higher in stable tectonic units,such as 7.95 km/s in the Lanping-Simao block and 7.94 km/s in the western margin of the Yangtze block,than in active or mobile tectonic units,such as 7.81 km/s in the Baoshan block,7.72 km/s in the Tengchong block and 7.82 km/s in the Zhongdian block.(2)The crustal nature of the Tengchong block,the northern Lanping-Simao block and the Zhongdian block reflects a type of orogenic belt,having relatively strong tectonic activities,whereas the crustal nature of the central Lanping-Simao block and the western margin of the Yangtze block represents a type of *** different features of the upper-middle crust velocity,Moho depth and Pn wave velocity to both sides of the Red River fault zone and the Xianshuihe fault zone,reflect that they are clearly ultra-crustal.(3)Based on the distribution of the low velocity zones in the crust,the crustal material of the Tibetan Plateau is flowing in a NW–SE direc

关键词： deep seismic sounding crustal structure outward expansion Chuan-Dian Block southeastern margin of the Tibetan Plateau

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Structural Characteristics of the Basement beneath Qiangtang Basin in Qinghai-Tibet Plateau: Results of Interaction Interpretation from Seismic Reflection/Refraction Data

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Acta Geologica Sinica(English Edition) 2013年第2期87卷 358-377页

作者： LI Qiusheng GAO Rui feng shaoying LU Zhanwu HOU Hesheng GUAN Ye LI Pengwu WANG Haiyan YE Zhuo XIONG Xiaosong LIU Jinkai HE Rizheng Institute of Geology CAGS Earthprobe and Geodynamics Open Laboratory of CAGS The Geophysical Exploration center CEA East China Petroleum Geology Bureau China Petrochemical Corporation

The studies on configuration, character/property of the basement of Qiangtang basin is helpful for evaluating petroleum and nature gas resources as well as understanding the basin evolvement. Recently a moderate to high-grade metamorphic gneiss rock was found underlying beneath very low metamorphic Ordovician strata in Mayer Kangri to the north of the central uplift. That fact actually proved existence of the crystalline basement just the distribution and structures of pre-Paleozoic crystalline basement still remain puzzle. In recent years a number of active sources deep seismic profiling, to aim at lithospheric structure of northern Tibet and petroleum resources of the Qiangtang basin, had been conducted that make it possible to image the structure of the basement of the Qiangtang. Near vertical reflection profiles, included those acquired previously and those during 2004 to 2008, have been utilized in this study. By through the interaction process and interpretation between the reflection profiles and the wide-angle profile, a model with the detailed structure and velocity distribution from surface to the depth of 20 km of Qiangtang basin has been *** on the results and discussions of this study, the preliminary conclusions are as follows：（1） The velocity structure section （~20 kin） that is interactively constrained by the refraction and reflection seismic data reveals that the sedimentary stratum gently lie until 10 km in the south Qiangtang basin. （2） The basement consists of fold basement （the upper） and crystalline basement （the lower）.The fold basement buried at the average depth of 6 km with a velocity of 5.2-5.8 km/s. The shallowest appear at range of the central uplift. The crystalline basement is underlying beneath the fold basement at the average depth of 10 km with a velocity of 5.9-6.0 km/s except near Bangong-Nujiang suture. （3） The high-velocity body at the depth range of 3-6 km of the central uplift is considered as a fragment of the cryst

关键词： seismic reflection seismic refraction basement structure Qiangtang basin Qinghai-TibetPlateau

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Sedimentary and tectonic evolution of the Banquan pull-apart basin and implications for late Cenozoic dextral strike-slip movement of the Tanlu Fault Zone

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Science China Earth Sciences 2023年第4期66卷 797-820页

作者： Peng SHU Xiwei XU shaoying feng Baojin LIU Kang LI Paul TAPPONNIER Xiaojuan DENG Guihua CHEN Nuan XIA Hongtai XU Jingjing QIN Fubing HE Yan MA Rongzhang ZHENG State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Anhui Earthquake Agency Hefei 230031China Mengcheng National Geophysical Observatory Anhui Earthquake AgencyMengcheng 233500China National Institute of Natural Hazard Ministry of Emergency Management of the People’s Republic of ChinaBeijing 100085China Geophysical Exploration Center China Earthquake AdministrationZhengzhou 450002China Seismic Hazard Mitigation Center of Shandong Province(Engineering Seismology Research Center of Shandong Province) Ji’nan 250014China Beijing Institute of Geological Survey Beijing 100195China

The Banquan Basin is a pull-apart basin with the largest scale and the most prominent structure due to dextral slip of the Tanlu Fault Zone(TLFZ) in late Cenozoic. The depositional history of the basin records the start time and evolution of the right-lateral strike-slip movement of the TLFZ. This paper studies the sedimentary and tectonic evolution of the Banquan Basin by seismic reflection exploration, borehole detection and cosmogenic nuclide chronology. We analyze the coupling relationship between the pull-apart basin and the strike-slip fault and discuss the start time and tectonic significance of the right-lateral strikeslip of the TLFZ. Our study indicates that the Banquan Basin has undergone three evolutionary stages: weak rifting during the pre-pull-apart period, strong extension during the syn-pull-apart period and subsidence during the post-pull-apart period. This implies that the TLFZ, which controls the evolution of the basin, experienced an evolutionary process of weak activity,intensified activity and migration of activity toward the central basin. The sedimentary filling of the basin has strong response to the episodic pull-apart and extension of the basin. Lying upon the basement of the basin, a thin layer of Miocene mudstone slowly accumulated due to local rifting before the strong pull-apart event. Along with the dextral slipping and pull-apart process, the basin was filled with alluvial fan facies, fluvial facies and floodplain facies strata from bottom to top. The latest tectonic movement of the TLFZ in the North China Block in late Cenozoic was dominated by episodic dextral strike-slip motion, and this deformation pattern started at 4.01±1.27 Ma. The latest tectonic deformation in North China since late Cenozoic was governed by eastward extrusion and tectonic orogenesis of the eastern margin of the Qinghai-Xizang Plateau since late Miocene. The eastward thrusting of the Liupanshan fault zone and sinistral shearing of the Qinling fault zone led

关键词： Banquan Basin Strike-slip movement Pull-apart basin Tanlu Fault Zone North China Plain Start time

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Exploration of Suspected Surface Ruptures of the M_S8.0 Wenchuan Earthquake at Frontal Areas of Longmenshan Using Shallow Seismic Reflection

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Earthquake Research in China 2009年第3期23卷 299-309页

作者： Liu Baojin Yang Xiaoping feng shaoying Kou Kunpeng Geophysical Prospecting Center China Earthquake Administration Zhengzhou 450002 China Institute of Geology China Earthquake AdministrationBeijing 100029China

The great M_S8.0 Wenchuan earthquake on May 12,2008 was generated by abrupt faulting in the Yingxiu-Beichuan fault along the Longmenshan fault zone. The earthquake not only produced surface ruptures along the Yingxiu-Beichuan and Guanxian-Jiangyou faults,but also surface ruptures,arching of highway pavement,sand-boils and waterspouts in various degrees in areas such as Shifang and Mianzhu on the Chengdu Plain. To understand the shallow geological structures under the surface rupture zone,a 6350m long high-resolution shallow seismic reflection profile in near-EW direction was performed. This profile is located at Shigu town,Shifang city,where a suspected earthquake surface rupture zone was discovered. In this study,a group interval of 3m,shotpoint interval of 18m,and a 300-channel 25-fold observation system were used. In consideration of both near-surface reflections and dipping interface imaging,we adopted the split-spread geometry and asymmetrical zero-offset receiving technique. To better suppress random-noise and raise the signal-to-noise ratio of seismic data,30 times vertical stacking of vibrator signals was made for each common-shot gather after correlation of individual records. By using the above work method and spread geometry,we obtained high-resolution images of structures in the depth range of 15m～800m after data processing. The result shows the existence of buried thrust faults thrusting to the plain area and back-thrust faults under the surface rupture zone. It also shows that the activity of the buried thrust faults may be the main cause for folding and deformation in near-surface strata and coseismic surface rupturing.

关键词： Ms8.0 Wenchuan earthquake Surface rupture zone Shallow seismic reflectionprofile Buried thrust fault

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Characteristics of the Zhengzhou Laoyachen Fault Revealed by Seismic Exploration Data

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Earthquake Research in China 2009年第2期23卷 161-169页

作者： Liu Baojin Zhao Chengbin Tian Qinjian Liu Yaoxing feng shaoying Geophysical Exploration Center CEA Zhengzhou 450002 China Earthquake Disaster Prevention Center CEA Beijing 100029 China Earthquake Administration of Henan Province Zhengzhou 450003 China

Exploration and research of fault activities are the fundamentals of earthquake prediction and prevention and disaster reduction. In order to determine the location, characteristics and activities of the Zhengzhon-Laoyachen fault, shallow seismic prospecting with different exploration depth across the Laoyachen fault was carried out in the northern suburbs of Zhengzhou city in 2006. The images of the subterranean structure and tectonics at depths of 30m- 6000m have been available by applying the combined methods of explosive seismic sources and vibrator seismic sources, as well as the combination of diverse observation systems with different parameters. The outcome indicates that the Laoyachen fault is a normal fault running NW and dipping NE, which offsets stratums ahead of Neogene （N）. However, no fault displacements are found in the interior stratums of Q ＋ N.

关键词： Laoyachen Fault Shallow seismic exploration Fault activity S/N

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银川盆地构造发展——深地震反射剖面揭示浅部地质与深部构造的联系

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地质科学 2016年第1期51卷 53-66页

作者：黄兴富酆少英高锐李文辉中国地质科学院地质研究所国土资源部深部探测与地球动力学重点实验室大陆构造与动力学国家重点实验室北京100037 中国地震局地球物理勘探中心郑州450002

横跨银川盆地北西西向的深地震反射剖面，清晰揭示了银川盆地边界断裂以及整个地壳的结构构造特征，这对研究具活动大陆裂谷性质的银川盆地浅—深构造关系具有重大的意义。贺兰山东麓山前断裂、黄河断裂作为银川盆地的西、东边界断裂，... 详细信息

横跨银川盆地北西西向的深地震反射剖面，清晰揭示了银川盆地边界断裂以及整个地壳的结构构造特征，这对研究具活动大陆裂谷性质的银川盆地浅—深构造关系具有重大的意义。贺兰山东麓山前断裂、黄河断裂作为银川盆地的西、东边界断裂，前者为一条缓倾斜、延伸至上、下地壳边界的犁式断裂，而后者则为一条切穿地壳并延伸进入上地幔的深大断裂。根据深地震反射剖面揭示的地壳结构特征，银川盆地浅部结构并非前人认为的“堑中堑”结构，而是表现为由一系列东倾犁式正断层控制的新生代断陷。略微下凹的Moho面几何形态以及厚2～3．2km的层状强反射带为下地壳最显著的反射特征。Moho面深度与强反射带厚度变化趋势与银川盆地沉积厚度变化趋势几乎一致。本文认为，强反射带的成因可能是由源自地幔的基性岩浆以岩席状的形式底侵进入地壳底部造成的，而这部分形成强反射带的物质可能补偿了因银川盆地断陷而造成的地壳减薄，最终导致银川盆地之下Moho面并未像之前所认为的那样隆起。

关键词：银川盆地深地震反射剖面深部构造岩浆底侵作用 Moho面

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Comprehensive Multi-Level Exploration of Buried Active Faults:an Example of the Yinchuan Buried Active Fault

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Earthquake Research in China 2007年第3期21卷 225-235页

作者： Chai Chizhang Meng Guangkui Du Peng Wang Yin Liu Baojin Shen Weihua LeiQiyun Liao Yuhua Zhao Chengbin feng shaoying Zhang Xuehui Xie Xiaofeng Earthquake Administration of Ningxia Hui Autonomous Region Yinehuan 750001 China Geophysical Exploration Center China Earthquake Administration Zhengzhou 450003 China

The paper introduces the steps and methods of multi-approach, multi-level exploration of buried faults in thick Quaternary sediment regions by taking the test exploration of the Yinchuan active fault as example. Based on the comprehensive analyses of previous data, we choose the Xinqushao Village of Xingqing District of Yinchuan City as the test site for the comprehensive exploration. Firstly, we adopted shallow seismic investigation with group intervals of 10m, 5m and lm to gradually trace layer by layer the master fault of the Yinchuan buried fault from a deep depth to a shallow depth where drilling could be used. Then, with composite geological profile drilling, we determined the precise location and dip angle of the fault. The drilling show the buried depth of the upper offset point is 8.3m. Finally, large-scale trenching revealed that the actual buried depth of the upper offset point of the fault is 1.5m from the ground surface and there are paleoearthquake events of 5 stages. Combined with the preliminary result of corresponding sample age, we conclude the Yinchuan buried fault is a mid to late Holocene active fault.

关键词： Buried active fault Comprehensive test exploration The upper offset point of fault Yinchuan

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浅谈图书馆综合信息管理的必要性

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科教导刊 2013年第30期 187-188页

作者：冯少英广东食品药品职业学院图书馆广东·广州510520

随着数字化和网络化大潮的推进,作为知识殿堂的图书馆正面临着全方位的技术革新,为了适应现阶段党的科学发展观的科学定位,我们应更加要重视图书馆信息化的建设.

关键词：电子信息互联网图书馆图书馆数字化

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