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Science china Earth Sciences 2005年第8期48卷 1089-1105页

作者： FAN Qicheng1,2, ZHANG Hongfu1, SUI Jianli1, ZHAI Mingguo1, SUN Qian2 & LI Ni2 1. institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, china 2. institute of Geology, china seismological bureau, Beijing 100029, china institute of Geology and Geophysics Chinese Academy of Sciences Beijing China institute of Geology China Seismological Bureau Beijing China

On the basis of mineral assemblage, mineralogy, petrology, and major, trace ele-mental and isotopic geochemistry of the underplated granulite- and eclogite-facies accumulate, peridotite and pyroxenite xenoliths entrained in Hannuoba Cenozoic basalts, this work con-strained the petrological constituents for the crust-mantle transitional zone, which is supported by the results of high-temperature and pressure velocity experiments on rocks and geophysics deep survey. Present lower part of lower crust is mainly composed of granulite-facies mafic accumu-lates (dominantly plagioclase websterite) and crust-mantle transitional zone dominantly com-posed of eclogite-facies pyroxenites with or without garnet and spinel lherzolites; Archaean ter-rain granulite is only nominally early lower crust. Magma underplating in the crust-mantle boundary led to the crustal vertical accretion and the formation of the crust-mantle transitional zone, which is a significant mechanism for the chemical adjustment of the crust-mantle boundary since the Phanerozoic.

关键词： magma underplating, xenolith petrology, geochemistry, cust-mantle boundary constituent, Hannuoba.

Characteristics of Tectonic Deformation and Mechanisms for the Active Maxianshan-Xinglongshan Fault System in the Lanzhou Area

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Earthquake Research in china 2003年第4期17卷 315-323页

作者： Yuan Daoyang, Liu Xiaofeng, Zheng Wenjun, Liu Xiaolong and Liu BaichiLanzhou institute of seismology, china seismological bureau, Lanzou 730000, china Lanzhou institute of seismology China Seismological Bureau Lanzou 730000 China

A detailed investigation permitted us to obtain quantitative data concerning fine geometric structures of 4.faults of the active Maxianshan-Xinglongshan fault system and the latest movement along them. Of them the northern Maxianshan border fault is a large-scale, strongly active Holocene reverse sinistral strike-slip fault, the other 3 faults, the southern Maxianshan border fault and the southern Xinglongshan border and the northern Xinglongshan border faults are the accompanying active late-Pleistocene thrust faults, which are incorporated into the main strike-slip fault, the northern Maxianshan border fault at depth. It is the most important earthquake-controlling fault in the Lanzhou area, the fault influences and constrains the seismic activity in the area.

关键词： Lanzhou Maxianshan-Xinglongshan mountains Active fault system Tectonic deformation

Basic Characteristics of Present Movement of Major Tectonic Blocks in china's Continent

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Earthquake Research in china 2001年第1期15卷 25-35页

作者： Lai Xi’an , Xu Jusheng , Zuoli Getu , Liu Jingnan , Shi Chuang , and Jiang Weiping1)institute of seismology, china seismological bureau, wuhan 4.0071 ,{4.2)wuhan University, wuhan 4.0072,{4. institute of seismology China Seismological Bureau Wuhan 430071 China wuhan University Wuhan 430072 China

In order to study the present crustal movement and geodynamics in china's continent, a countrywide GPS monitoring network consisting of 22 stations was set up evenly on major tectonic blocks in china's continent in the early 1990s. Three-phase observations using the network were carried out in 1992, 1994. and 1996, respectively. In this paper, the data processing and accuracy of the three-phase observations are examined and the basic characteristics of present block movement in china's continent are analyzed based on the data of three-phase repeated observations. The study result indicates that the accuracy of data obtained in three-phase observations on the GPS network reaches 10-8 ～ 10-9, which is adequate to the need of monitoring of crustal movement. A model for block movement in china's continent constructed based on the result of the three-phase observations has effectively tested the results of geological and geophysical studies. In global framework, china's continent as a whole shows its clear eastward motion and its regional movement relative to Siberian block is characterized by that the western china is mainly affected by northward subduction and pushing of Indian Plate. Qinghai-Xizang Plateau shows clear eastward lateral slip simultaneously with longitudinal compression. It is more favorable to the escape model for the continent. Block movement of eastern china is under the combined effect of Indian, Pacific,and Philippine plates, resulting in northeastern and eastern motions of eastern china up to southeastern coastal region where the effect of Philippine Plate strengthens.

关键词： china's continent Block movement GPS monitoring network

The Crustal Structure and Seismic Activity in North china

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Acta Geologica Sinica(English Edition) 1989年第4期63卷 343-359,448-449页

作者： Feng Rui institute of Geophysics, State seismological bureau, Beijing Huang Guifang, Zheng Shuzhen, Wang Jun, Yan Huifen Geophysical Prospecting Party, State seismological bureau, Zhengzhou, Henan and Zhang Ruoshui seismological Technique College, State seismological bureau, Yanjiao,Hebei institute of Geophysics State Seismological Bureau Beijing China

A layered crustal block model of North china has been constructed based on large amount of data from seismic sounding carried out in recent two decades. Some deep fault zones, such as the *** and Tancheng-Lujiang fault zones, divide the upper crust of North china into three upper crustal terranes and nine bolcks. There are distinct differences in velocity and depth distributions, which reflects Cenozoic block faulting in North china in the process of formation of the deep structure. The upper crust shows the features of transition in isostatic adjustment. The existence of a low-velocity layer in the middle crust is characteristic of the crustal structure in North china. There seems to be an increase of rheology of the rocks in the lower crust and a persistence of stable regional stress field. The patterns of the Moho on two sides of the Yanshan-Taihang Mountains are different. The relief of the Moho around Beijing, Shijiazhuang and Guangrao where the deep faults join together shows a quadrantal distribution in some degree. The dynamic sources for seismic activity are the NE-SW horizontal compression and the diapirism of the upper mantle. The middle and upper crust, especially the layered block structure has the most significant effects on seismicity, and the occurrence of earthquakes is more closely related to them than to the Moho.

关键词： The Crustal Structure and Seismic Activity in North china Activity

Deep Structures in china and Its Adjacent Areas: Plate Tectonics and Its Metallogenic Significance

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Acta Geologica Sinica(English Edition) 1995年第3期69卷 223-239页

作者： Chen Shengzao institute of Geophysics, State seismological bureau, Beijing institute of Geophysics State Seismological Bureau Beijing

This paper proposes a new tectonic pattern of the deep-seated structures in china and its adjacent areas (including the T - A - B system of the Ryukyu Islands). This is based on studies of the gravity field and gravity inversion coupled with the summation of the most recent achievements in geophysical studies. From a plate-tectonic point of view, the metallogenic characteristics and their indications at depth, as well as relevant geophysical-geological characteristics of four tectonic environments of the Chinese continent are analysed, and a classification of composite metallogenic provinces and belts and prediction of metallogenic prospects are made. The author extends the Kunlun-Qilian-Qinling tectonic belt to the T-A-B system of the Ryukyu Islands through the NW deep boundary of the Hangzhou Bay, and also proposes the following basic views' the migration and superposition of tectonic environments led to the formation of a composite metallogenic system; the change in the tectonic environment resulted in the superposition of various types of mineral deposits; seismic activities and metallogeny are mutually inducing factors. These views will be helpful to a discussion on the tectonic environments and metallogenic regularities.

关键词： deep structure tectonic environment metallogeny

The Geoscience Transect from Xiangshui,Jiangsu Province to Mandal,Inner Mongolia

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Acta Geologica Sinica(English Edition) 1992年第1期66卷 1-21页

作者： Ma Xingyuan Liu Changyuan Liu Guodong Jiang Minxi institute of Geology,State seismological bureau,Beijing Geophysical Exploration Pafrty,State seismological bureau,Zhengzhou. 2institute of Geology State Seismological Bureau Beijing. 3Geophysical Exploration Party State Seismological Bureau Zhengzhou.

The Xiangshui to Mandal geoscience transect, which has a total length of 1,200 km, extends diagonally,from SE to NW, across the Sino-Korean plate and its ancient continental margin, passing through nine tectonicunits: the Subei-Jiaonan terrane, West Shandong block, North china rift basin, Taihang-Wutai block, Ordosblock, Hu-Bao (Hohhot-Baotou) Basin, Yinshan block and Inner Mongolian fold system. The graphic display of the transect is compiled according to the Guidelines for the Global GeoscienceTransect (GGT) Project on the basis of an integrated study of all available geological, geochemical andgeophysical data, thus bringing light to the process of cratonization of the Sino-Korean plate and its relation-ship with the transitional zone of the ancient continental margin, and the features of intraplate structures pro-duced by subsequent tectonic modifications and intraplate dynamics.

关键词： The Geoscience Transect from Xiangshui Jiangsu Province to Mandal Inner Mongolia

Magnetic Fabric of Cuizhao Pluton and ItsEmplacement Significance

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Journal of Earth Science 1999年第3期18卷 274-279页

作者： Zhou Weixin(institute of Geology, china seismological bureau, Beijing 100029)Wan Tianfeng(Department of Geology and Mineral Resources, china University of Geosciences, Beijing 100083) institute of Geology China Seismological Bureau Beijing 100029 Department of Geology and Mineral Resources China University of Geosciences Beijing 100083

The new micro-structural and magnetic fabric data on Cuizhao plutou and their emplacement implications are demonstrated in this peper. The magnetic foliations develop better and the degree of magnetic susceptibility anlsotropy is larger in the margin of the pluton than that in the center,which reveals mainly horizontal compression or magma during emplacement- The mapnetic lineations are not very well developed. The magnetic fabrics in the Cuizhao pluton reveal horizontal compression like the bollooning model during emplacement near the Earth surrace. This feature was fixed in later tectonic events.

关键词： granitoid pluton magnetic fabric foliation lineation emplacement mechanism

LATE QUATERNARY FAULTING OF JIALI FAULT

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地学前缘 2000年第S1期7卷 147-148页

作者： Ren Jinwei 1, Shen Jun 1, Cao Zhongquan 2, Wang Yipeng 1(1 institute of Geology, china seismological bureau, Beijing 100029,china, E\|mail:ren@eq\|*** 2 seismological {4. of Tibet Autonomous Region, Lhasa 850000,china)

Jiali fault is one of the major faults in southeastern Tibetan plateau. From Naqu to Jiali along which the field investigation has been done, the fault roughly extends in N60W direction and consists of three segments arranged in en echelon. From Luoermano to Esukongma (about 4.km) where the fault is the northern boundary of the Sangdi basin that extend north\|south, late Quaternary surface ruptures have been found. Within this segment the creeks and gullies that cross the fault were offset and the displacements range from several meters to about 5km. The average slip rate during late Quaternary is about 10mm/a for this segment. An interesting phenomena is that the large displacement can only be found at those places where the fault is related to the basins that extend north\|south. Outside the basins, no convincing evidence has been found for late Quaternary surface ruptures and average slip rate for the whole fault is only about 3mm/a middle Pleistocene. It seems that these strike\|slip faults behave like a transform fault and the strike\|slip motion along them were a consequence of east\|west extension that creates the north\|south graben systems rather than the vice versa.

关键词： faulting slip\|rate Jiali fault Tibetan Plateau

Examination of Historical Data of the 1125 Lanzhou M 7.0 Earthquake and Analysis of Seismogenic Structure

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Earthquake Research in china 2002年第4期16卷 351-362页

作者： Yuan Daoyang, Lei Zhongsheng, Liu Baichi, Cai Shuhua, Liu Xiaofeng and Wang YongchengLanzhou institute of seismology, china seismological bureau, Lanzhou 730000, china Lanzhou institute of seismology China Seismological Bureau Lanzhou 730000 China

Detailed examination of historical data of earthquakes and field investigations of loess landslide caused by the earthquake and tracing of active faults in Lanzhou area indicate that the Yijitanpu town, one of six towns of Jincheng city, was devastated by the 1125 Lanzhou earthquake. The citly is now located in the Vinylon Factory south of Hekou (River Mouth) in the Xigu district of Lanzhou city. We delermined that the six old towns mentioned in historical records lie in an area stretching from the south of Xigu district to Hekou in Lanzhou. This is consistent with the distribution of loess landslides caused by the earthquake, the extension of Holocene active faults, and the distribution of traces of the seismic rupture zone. A comprehensive analysis shows that the seismogenic structure for the 1125 Lanzhou M 7.0 earthquake should be the Xianshuigou fault segment at the western termination of the north-border active fault zone of the Maxianshan Mountains which are located in south of Lanzhou city with the distance of only 4.km.

关键词： Lanzhou Historic earthquake Loess landslide Seismogenic structure

Co-seismic ground deformation and source parameters of Mani M7.9 earthquake inferred from spaceborne D-InSAR observation data

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Science china Earth Sciences 2004年第6期47卷 481-488页

作者： SHAN Xinjian1,MA Jin1,WANG Changlin2,LIU Jiahang1,SONG Xiaoyu1 & ZHANG Guifang1 1.institute of Geology and Laboratory of Tectonophysics,china seismological bureau,Beijing 100029,china 2.institute of Remote Sensing Application,Chinese Academy of Sciences,Beijing 100101,china institute of Geology and Laboratory of Tectonophysics China Seismological Bureau Beijing China institute of Remote Sensing Application Chinese Academy of Sciences Beijing China

We obtain the co-seismic ground deformation field of the Mani M7.9 earthquake on November 8, 1997 through three-pass differential interferometric processing. Then we get the geometric and kinematics parameters of this event by the elastic half-space model and forward modeling with the InSAR data. The following results have been obtained: (i) The deformation fields on both sides of the seismogenic fault are affected by the co-seismic deformation field even in 110 km away from the fault. The loss of phase coherence belt caused by the zone of ground rupture crosses the image from east to west with a length of an area 110 km. (ii) The maximum horizontal displacement caused by the earthquake reaches 7.96 m. (iii) The earthquake fault can be divided into four parts, and the deformation field of the middle two parts is bigger than that of the other two, with lengths of 27 km and 37 km, respectively. And their average sliding values on the rupture surface are 6500 mm and 6000 mm, respectively, and their depths both are 35 km. The segment of 27 km length is the major rupture surface of this earthquake. The west part and the east part of the fault have lengths of 23 km and 26 km, respectively. The sliding value of the west one is 4.00 mm and that of the east one is 5800 mm. They extend to depths of 20 km and 18 km, respectively.

关键词： D-InSAR, surface deformation field in sight direction, Mani earthquake, characteristics of earthquake fault.