Journal of Wuhan University of Surveying and Mapping University of Science and Technology is the first. Research on Rotational Motion of North China Block Using Re-measurement Data Xu Caijun Liu Jing Nan Huang Dingbo Li Yanxing School of Geodesy and Engineering, Wuhan University of Surveying and Mapping, Luoyu Road, Wuhan, President ’s Office of Wuhan University of Surveying and Mapping, Wuhan Luyu Road, Wuhan, China Earthquake Administration No. A topographical change monitoring center, Tianjin City, summarized the data of the annual observation period of the North China region monitoring network and the Capital Circle monitoring network using G and pieces to estimate the crustal horizontal motion velocity field in the North China region to invert the block Rotational motion parameters are discussed, and the rotational motion of the North China block is discussed, compared with geological and paleomagnetic results. Finally, the dynamic mechanism of the North China block is analyzed. Key words North China block rotation motion mechanics mechanism classification number North China sub-plate neotectonic activity and seismic activity are very strong, the north-east trending Zhenglu fault zone Cangxi-Taihangshan piedmont fault zone Shanxi graben system developed from east to west And other active tectonic belts. According to the main seismic tectonic belts and regional seismic tectonic patterns in North China, the North China Block can be divided into two first-order active blocks, the Ordos active block and the Taihang Jiluxi active block. The boundary zone is the Shanxi graben system. Among them, the Taihang-Hexi-Luxi block can be divided into the Taihang mountain block in the North China Plain, including the Huangche fault block and the Luxi fault block) the Jiaoliao block and the Yinshan-Yanshan block in the north of North China. It is the most important in China. One of the seismically active areas. This paper mainly uses data and combined with geological and paleomagnetic data to study the rotational motion and dynamic mechanism of the North China block. use. The Euler vector parameters can be calculated. The basic method for determining the rotational motion of the North China block is to determine the basic method of the rotational motion of the North China block. The crustal block is regarded as a rigid body. A kinematic model is established. The Euler vector is used to describe the block motion. Using the velocity field to calculate the Euler vector parameters through the following inversion. Because the measurement is not accurate in the vertical direction, the component, component, and component calculations are discarded. , The expression is for the sake of a scorpion, and the blade is one, seven, eight, eight, and Tian Bian, eight. In Tian's formula, the average radius of the earth is one or two, which is the rotation angular velocity component. It is the latitude and longitude of the observation point. In the formula ,. It is Euler polar coordinates in the rotation angular velocity. The baseline solution of the velocity field observation is obtained by software. The relative accuracy of the baseline during the period is year by year, year by year, and year by year. The unit solution is used to calculate the baseline vector solution and its full covariance matrix. The overall adjustment of the network is carried out under the four framework using software, and the The velocity field under the frame and the velocity field relative to the Siberian block under the frame, see the block block. The rotational motion vector assumes that the crustal block is rigid, so the stability of each block point is tested by the stability on each block. Point group, the rotation motion parameters of each block can be obtained by the formula. The table is based on the data in the table. If the two-year results of one year and one year and one year are taken as simple arithmetic averages, it can be known that the North China sub-plate is absolutely under the framework The movement revolves around 70 at a rotation rate of millions of years. It rotates counterclockwise and rotates counterclockwise relative to the Siberian block in millions of years. The specific movement of each block on the sub-plate can be obtained from the table. The date is related to the National Outstanding Youth Science Fund and the National Project Funding Project, the number and the first phase of Xu Caijun, etc. The use of re-measurement data to study the rotational motion map of the North China Block gives the results of the velocity field expressed by the model and the velocity field of a model. . It can be seen from the figure that, except for a little difference in size, the directions are in good agreement. This shows that the North China block is in a rigid state as a whole. The geological evidence of the counter-clockwise rotation of the North China block and the paleomagnetic evidence show that the horizontal velocity field is under the protection of Wang Xixi (compared to the structural evidence of the counterclockwise rotation of the Chuan block in the Siberian block since the Neo-Tertiary, Blocks such as the Ordos Taihang Mountains and the North China Plain within the North China sub-plate that are bounded by north-north-east tectonic activity belts have experienced or are undergoing counterclockwise rotation. The counterclockwise rotation of these blocks is first reflected in the north-north-east direction structure The active belts are all right-handed shear type with tilt-slip component. According to field investigations and analysis of borehole data, the shearing of the Ordos and Taihang Mountains into the Shanxi graben was first formed in the new century. Since the late Cenozoic of the North-East fault zone in the North China sub-plate, the maximum right-handed displacement is about the width of the Taihang Mountain block in the Shanxi graben system, which is about two. According to the amount of rotation of the block (represented by the rotation angle) and the boundary The sliding displacement and block width of the fault zone have the following geometric relationship table. Under the frame, the rotational motion parameters of the North China sub-plate and its block are: l head cage observation time block name Meng spoon`ne j jong, bow`, ca Pseudo ó years North China sub-plate Yingong Yanshan block Ordos block gel Liao block Taihang Ji Luxi block North China sub-plate Yinshan Yanshan block Ordos block gel Liao block Taihang Ji Luxi block Angular velocity error in the angular velocity. n. 1 Umbrella gas in January of a million years, only dead door z spoon J eight j ", l pseudo`, l` 1. Rotational movement of the spoon` table relative to the Siberian block North China sub-plate and its block The parameter is the head error, the elliptical pole observation time, the block name, the angular velocity towel / umbrella gas, the millionth year, the North China sub-plate, the Yinshan Yanshan block, the Ordos block, the Jiaoliao block, the Taihang, the Jiluxi block, the North China sub-plate, the Yinshan Yan block. The Ordos block, the Jiaoliao block, the Taihang, Jixi, and the Xixi blocks. Suddenly sighed in a sigh of relief, l died within 1 month, Yue Shi eU mortar n Bu. Only a few spears `dreamed of Dan C Baqi à Nei J` mouth year in one-occupancy type, accounting for the original angle between the north-north-east fault and the near east-west boundary. Ten accounting for the angle after rotation. It can be obtained that the counterclockwise rotation angle of the Taihang Mountain block since the new century is equivalent to counterclockwise rotation at an angular velocity of one million years. Another piece of evidence that reflects the counterclockwise rotation of the blocks at various levels is that the north and south ends of each block are near the east-west direction, and the same distribution corresponding to the counterclockwise rotation of the blocks appears near the boundary. Journal of Wuhan University of Surveying and Mapping The secondary tension zone of the year. The northern tip of the Taihang Mountain block is a north-east-southeast area composed of northeast-eastward basins such as Tianzhen-Yangyangyang Hunyuan Lingqiu County and Yanhuai. During the Pliocene to Quaternary period, the maximum extension of the western crust The difference in the extension of the crustal extension between the eastern and western parts of northern Shanxi means that the Taihang Mountain block rotates counterclockwise. According to the difference of crustal extension, the rotation angle can be calculated as one or two. The difference between the crustal extension is the distance between the squares of the calculated extension profile), which is equivalent to the counterclockwise rotation at an angular velocity of one million years. Leah's counterclockwise rotation in millions of years corresponds. Relative Motion of Blocks For two adjacent blocks, the absolute angular velocity vectors are respectively. The relative angular velocity vectors of the two blocks can be expressed as the second one from the second. From the production knife, the horizontal velocity field shown by the model is The horizontal velocity field expressed by the model in the intestinal side, in the formula of 1-2, 1-2, 1,2, and 2. See one. The results of the epitaxy can be obtained according to the formula. The relative angular velocity vector between the North China sub-plate blocks under the frame is See the table for the relative motion velocity vector. From the table and the figure, it can be seen that the Taihang Jiluxi block and the Ordos block and its adjacent Yinshan Yanshan block undergo a slightly left-handed stretching motion. The Taihang Jiluxi block and its adjacent The Ordos block has a slightly right-handed extensional movement. ③The blocks on both sides of the upper fault zone of the Zhenglu fault zone have a strong right-handed extensional movement, while the blocks on both sides of the lower fault zone of the Zhenglu fault zone The body makes a relative squeeze motion. Honghan Jingren used the active fault data to calculate that the North China block circumvented the Eurasian plate in millions of years4. The counterclockwise rotation is in good agreement with the measured millions of years. Ancient geomagnetic evidence Most rocks, especially volcanic rocks, contain more or less ferromagnetic and ferrimagnetic minerals. During the formation of the rocks, these minerals formed the original residual ore under the action of the geomagnetic field at that time and were stored in the rock. As the block rotates, the direction of the primary remanence also rotates. Therefore, using the ancient geomagnetic method to measure the original residual magnetic declination and dip in the strata at different periods and compare it with the magnetic declination and dip in the same period, we can obtain the rotation scale of the block where these strata are located around the vertical axis and the horizontal axis According to Xu Xiwei, Liu Chunlin, and Jinlu's research, the Taihang Mountain block of the North China subplate (Xiyang and Hebei Xueshan) has been turned counterclockwise relative to Baicheng, Xinjiang, since the Neo-Tertiary. If it rotates counterclockwise and the southeast corner of the North China Plain block in Nanjing, Jiangsu, Daruo takes the average of these locations as the counterclockwise rotation angle of the North China sub-plate, then it can be seen that since the Third World, North China has reversed relative to Baicheng in Xinjiang Turning the hour hand is equivalent to turning counterclockwise with the tail. This is in contrast to the dynamic mechanism of the counterclockwise rotation relative to the North Siberian block derived from the results. Mainland China is located at the intersection of the Eurasian plate and the Pacific plate in the Indian plate. The internal tectonic movement and deformation are relative to these plates. product. On the southwestern side of mainland China, the Indian plate advances towards the Eurasian plate at a rate of 50 per year, and a strong northward thrust is generated in western China, forming a series of near-axial arc-shaped reverse fault zones. In eastern China, the subduction of the Pacific Plate towards the Eurasian Plate and the arc-shaped expansion of the Sea of ​​Japan are equivalent to exerting a pushing force from southwest to west. Therefore, the combined effect of the interaction between the Indian plate, the Eurasian plate, and the Pacific plate has formed a general stress field pattern in the mainland of China where the principal compressive stress axis is regularly deflected from the west to the north to the east to the north. Since the Neogene, the Indian plate and the Eurasian plate have collided further. The rapid uplift and expansion of the Qinghai-Tibet Plateau have caused a strong north-east pushing effect on the southern section, which has affected the two boundaries of the North China Asian plate ( That is, the western part of the Ordos block) The southern section is actually affected by a set of pushing forces that decrease in magnitude from south to north from near east to west to north east, considering the rigidity of the block and the constraints of the surrounding environment, This group of pushing forces will cause the Ordos block to rotate counterclockwise. Similarly, according to the first phase of force transmission, Xu Caijun et al. Used the re-measurement data to study the principle of rotation of the North China block. The Taihang Mountain block and the North China Plain block will also rotate counterclockwise. The relative angular velocity between the North China sub-plate blocks is the same as the price block. It is used by Shaoyin Mountain, Yanshan, Yingerdos, Hebei, and Luxi. Liaoyin Mountain, Yanshan, Taihang, Jilin, Luxi, Erdos, Taihang, Jilin, Shanxi . Fighting winter Ruyin Yanyin monthly coins show Ji Ran Xiyin Yanzhou Gong Erduo fight for one month ~ month` plus help report month Tanzaki Festival plus t. Pendan,. The measurement results of the relative motions of the two blocks in the Taihang bag Luxi Taihang Jiling p Qijiao Liaotu show that the North China sub-plate and its blocks are rotating counterclockwise, and the north-northeast structure between the blocks The right-handed shear movement of the active belt is the product of adjusting this counterclockwise rotation and the concrete manifestation of tectonic activity. Acknowledgements The data baseline processing of this article was completed by Liu Zhizhao and Hu Xinkang, the calculation of network adjustment and block relative motion was performed by Shi Chuang Chen Ting, and the picture was adopted by Dong Lixiang. References Ding Guoyu, Lu Yanzhu. A preliminary discussion on the status of modern intra-board sports in China. Science Bulletin, Yi Honghanjing, Wang Yipeng, Shen Jun, etc. The average image of the crustal block motion in China's mainland and its dynamic significance. Theory and application of active fault research, Huang Liren, Guo Liangqian, Ma Qing. Preliminary analysis of retest results of North China Network. Theory and application of active fault research, 1 Li Yanxing, Hu Xinkang, Wang Min. The relationship between horizontal crustal movement, stress field and seismicity in the monitoring network construction in North China. China earthquake, Liu Chun. The paleomagnetic studies of some Cenozoic basalt groups in the area near Nanjing and the preliminary recognition of their geological age. Geophysics, Lin Jinlu. China Paleomagnetic Data Sheet (Geological Science, Lin Jinlu. Chinese paleomagnetic number geology science, 3 Xu Xiwei. Rotation model and power source of North China and its adjacent blocks. Earth Science (Journal of China University of Geosciences, Yixin Division h Waishan Ruwang Guanpai) Male, aged, professor, Botuo tutor, now mainly engaged in geodesy geophysical inversion and dynamic geodesy research. Representative achievements Research on the monitoring of the current crustal movement on the Tibetan Plateau and the study of its dynamic mechanism Research on the crustal movement and deformation of the Tibetan Plateau, etc. A bang B J g, started. B's eyes and eyes, a section that recognizes Menzhou's Meimei and Duanzhen's glances Mo Yi called Yang Zi already
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