24 results on '"Wang, Qingchen"'
Search Results
2. Improved Electrogeometric Model of UHV Transmission Line Based on Long Gap Discharge and Its Application
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Hu, Yuanchao, Yang, Minghao, Qu, Lu, An, Yunzhu, Wang, Jing, Cheng, Yan, Sha, Xiao, Wang, Qingchen, Ma, Chenghui, An, Bingchen, and Chen, Dan
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Economics and Econometrics ,Fuel Technology ,Renewable Energy, Sustainability and the Environment ,Energy Engineering and Power Technology - Abstract
Based on long air gap discharge test data and lightning return stroke observation data, an improved electrogeometric model (EGM) considering terrain conditions is established and verified to analyze the lightning shielding performance of UHV transmission lines. The striking distance formula is modified as rs = 0.13 (I2 + 40I)0.814. In this paper, the lightning shielding failure rate of three-phase conductors of EHV and UHV transmission lines calculated by the improved EGM model is consistent with the lightning observation data of actual transmission lines in Japan and the scaled lightning discharge simulation experimental results of UHV transmission lines in plains and mountainous areas of China, which verifies the applicability of the improved EGM model to evaluate the lightning shielding performance of large-scale UHV transmission lines. The improved EGM model is applied to evaluate the influence of tower type and slope steepness on the shielding failure tripping rate of UHV transmission lines. The shielding failure tripping rate of the SZ322 tower is higher than that of the SZT1 tower, and the shielding failure tripping rate of UHV transmission lines is greatly affected by slope gradient and increases with the increase of slope gradient.
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- 2022
3. Verifiable RFID Location Privacy Scheme Based on NIZK
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Wang Qingchen, Chen Yuan, and Tang Hongyu
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- 2021
4. Value of Information in Networked Control Systems Subject to Delay
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Siyi Wang, Qingchen Liu, Precious Ugo Abara, John S. Baras and Sandra Hirche
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ddc - Published
- 2020
5. Environmental Redox Changes of the Ancient Sea in the Yangtze Area during the Ordo-Silurian Transition
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Chu Yang, Chen Daizhao, Wang Jian-guo, Wang Qingchen, and Yan Detian
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chemistry.chemical_classification ,Total organic carbon ,Geochemistry ,Halocline ,Geology ,engineering.material ,Anoxic waters ,Sedimentary depositional environment ,Oceanography ,Water column ,chemistry ,engineering ,Organic matter ,Pyrite ,Sea level - Abstract
Extensive organic-matter (OM) rich facies (black shales) occur in the Ordo-Silurian boundary successions in the Yangtze area, South China. To investigate the redox changes of the Yangtze Sea during the Ordo-Silurian transition, two OM sections (Wangjiawan in Yichang, Hubei Province, and Sanjiaguan in Zhangjiajie, Hunan Province) straddling the Ordo-Silurian boundary are studied. The measurements finished in this study include contents of the total organic carbon (TOC), pyrite sulphur, and different species of Fe, including dithionite-extractable Fe (FeD), pyrite Fe (FeP), HCI-extractable Fe (FeH), and total Fe (FeT), in black shales, as well as other redox proxies, such as the S/C ratio, the ratio between highly reactive Fe (FeHR = FeD + FeP) and FeT, and the Fep/(FeP + FeH) ratio, known as the degree of pyritization (DOP). In the Wangjiawan section, the Middle Ashgill sediments have high FeHR/FeT ratios (0.20-0.77; avg. 0.45), high DOP values (0.21-0.72; avg. 0.54), and a relatively constant sulfur content independent of the organic carbon content. By the contrast, the mid-early Hirnantian deposits generally have low FeHR/FeT ratios (0.10-0.35; avg. 0.21), low DOP values (0.11-0.40; avg. 0.28), and S/C values are clustering on the normal marine value (S/C = 0.36). The late Hirnantian and early Rhuddanian deposits, similar to those of the Middle Ashgill deposits, are characterized by high FeHR/FeT ratios (0.32-0.49; avg. 0.41), high DOP values (0.46-0.68; avg. 0.53) and fairly constant sulfur contents. These data suggest the occurrences of marine anoxia on the Yangtze Sea shelf during intervals of the Mid Ashgill, Late Hirnantian and Early Rhuddanian, and ventilated and oxygenated marine conditions during the mid-early Hirnantian time. The mid-early Hirnantian ventilated event was concomitant with the global glacial period, likely resulted from the glacio-eustatic sea-level fall and subsequent circulation of cold, dense oxygenated waters upon the shelf seabed. Accordingly, the abrupt change from oxygenated to anoxic marine waters from the late Hirnantian and the early Rhuddanian were resulted from the post-glacial rise of eustatic sea level. Combined with the data from Sanjiaguan section near the subemergent highland, salinity stratification of water columns are strongly evidenced by very low S/C ratios (0.00-0.08, avg. 0.02), low FeHR/FeT ratios (0.10-0.37, avg. 0.27), low DOP values (0.01-0.27, avg. 0.10), and TOC contents (0.72%-4.27%, avg. 2.55%). Under this circumstance, the anoxic water columns could have formed beneath the halocline, above which desalinized waters formed. In the Wangjiawan section, TOC contents are generally high (0.94-9.32%, avg. 4.44%), but low (0.35%-2.12%, avg. 1.29%) in the mid-early Hirnantian that is coincident with the oceanic oxic stage, together with relation of the organic contents to the stratal thickness, suggesting that the accumulation of the organic matter was mainly controlled by the oxygen levels of the water columns; on the other hand, productivity and depositional rate may also have played a role in the organic accumulation and preservation.
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- 2010
6. Optical Design of Rigid Endoscope with 30° Viewing Angle
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Zhang Shuqing, Zhi Xiyang, Wang Qingchen, and Huang Yuanxin
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Optics ,Materials science ,business.industry ,Rigid endoscope ,business ,Viewing angle ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2018
7. Denim Defect Detection Based on Optimal Gabor Filter
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景军锋 Jing Junfeng, 王清晨 Wang Qingchen, 王晓华 Wang Xiaohua, 张蕾 Zhang Lei, and 李鹏飞 Li Pengfei
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Gabor filter ,business.industry ,Computer science ,020208 electrical & electronic engineering ,0202 electrical engineering, electronic engineering, information engineering ,Pattern recognition ,02 engineering and technology ,Artificial intelligence ,Electrical and Electronic Engineering ,Denim ,business ,Atomic and Molecular Physics, and Optics - Published
- 2018
8. Exhumation of the Dabie UHP Terrane, China
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Wang Qingchen, Lin Wei, Guo Jinghui, and Shi YongHong
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Blueschist ,Craton ,geography ,geography.geographical_feature_category ,Subduction ,Lithosphere ,North china ,Geology ,Petrology ,Foreland basin ,Seismology ,Terrane - Abstract
Exhumation of deeply buried ultrahigh-pressure (UHP) terranes remains a puzzle in understanding lithospheric dynamic process. New evidence that constrains the exhumation process of the Dabie UHP terrane includes the following. (1) Structural data record the architecture of the Dabie UHP terrane. Three slices are recognized—i.e., from top to bottom, the Susong blueschist slice, the Huangzhen-Huangweihe (HH) HP slice, and the Jinheqiao-Shuanghe-Bixiling (JSB) UHP slice. These slices have been stacked and domed. (2) Geophysical data depict two offsets in the Moho. Offset-I separates the Dabie UHP terrane from the North China craton, and has served as a subduction channel, as well as an exhumation channel. Offset-II, separating the Dabie UHP terrane from the foreland belt, developed due to geodynamic regime reorganization. (3) Geochronological data reveal that the HP slice was exhumed earlier that the UHP slice. A northward-younging exhumation polarity is implied, with younger exhumation age closer to the exh...
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- 2008
9. Propagation Characteristics of Dielectric-Loaded Graphene Plasma Waveguides
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宋 梁 Song Liang and 王清晨 Wang Qingchen
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Materials science ,business.industry ,Graphene ,02 engineering and technology ,Plasma ,Dielectric ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,010309 optics ,law ,0103 physical sciences ,Optoelectronics ,Electrical and Electronic Engineering ,0210 nano-technology ,business ,Graphene nanoribbons - Published
- 2017
10. New Data Regarding Hotly Debated Topics Concerning UHP Metamorphism of the Dabie-Sulu Belt, East-Central China
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Wang Qingchen, Zhai Mingguo, and Cong Bolin
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Recrystallization (geology) ,Subduction ,Mantle wedge ,Oceanic crust ,Lithosphere ,Metamorphic rock ,Geochemistry ,Metamorphism ,Geology ,Eclogite - Abstract
Critical but controversial problems in the study of UHP metamorphic rocks from the Dabie-Sulu region include: (1) the possible existence of ophiolitic melange; (2) the “in situ” versus “foreign” origin of UHP eclogites and their enclosing gneisses; (3) the possible presence and role of fluids during ultrahigh-pressure (UHP) recrystallization; (4) the timing of collision between the Yangtze and Sino-Korean continental blocks; (5) the polarity of syncollisional subduction; and (6) a single-versus multistage exhumation scenario for the UHP rocks. These questions are discussed in light of new geological, geochemical, and isotopic constraints. Our conclusions for the Dabie-Sulu belt are as follows: (1) Mafic-ultramafic blocks are of two distinct origins: one group samples lithosphere of the suprasubductionzone mantle wedge, whereas the second group represents postcollisional magmatic intrusions. Neither lithologic group represents true oceanic crust. (2) Quartzofeldspathic gneisses enveloping the eclogites are...
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- 1999
11. Structural coupling of the Dabie Orogen with Hefei Basin
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Ma Li, Wang Qingchen, and Cong Bolin
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Structural coupling ,Multidisciplinary ,Inversion (geology) ,Geochemistry ,Orogeny ,Mesozoic ,Structural basin ,Geomorphology ,Mantle (geology) ,Geology - Abstract
Geological, geophysical and geochemical data show that both of the Dabie Orogen and Hefei Basin formed during a Mesozoic orogeny. A three-stage development of the Hefei Basin includes down-warping, half grabben, and positive inversion. Both the uplift in orogen and the depression in basin resulted from the “de-rooting” of orogen and up-welling of the mantle.
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- 1997
12. Top boundary of the Dabie UHPM rocks, central China
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Cong Bolin, Liu Xiaohan, Wang Qingchen, and Shigenori Maruyama
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Felsic ,Metamorphic rock ,Geochemistry ,Feldspar ,Shear (geology) ,visual_art ,Earth and Planetary Sciences (miscellaneous) ,visual_art.visual_art_medium ,General Earth and Planetary Sciences ,Clockwise ,Shear zone ,Quartz ,Geology ,General Environmental Science ,Gneiss - Abstract
The top boundary of the ultra-high pressure metamorphic (UHPM) rocks in the Dabie Mountains, central China, has been mapped. The results show that the top boundary of the UHPM rocks is occupied by flat-lying felsic gneiss, on which tonalitic gneiss rests. Petrological and mineralogical evidence indicates a wide P-T gap across the boundary with an estimated peak metamorphic P-T value of the UHPM rocks being >30 kbar and 800 ± 50°C, and that of the tonalitic gneiss around 11 kbar and 800°C. Their P-T-t paths are different. The former has a clockwise path and the latter is counterclockwise. This implies that the UHPM rocks at the bottom and the tonalitic gneiss on top have been structurally juxtaposed together. The top boundary, i.e. the contact between the UHPM rocks and tonalitic gneiss, shows characteristics of a ductile shear zone. Microscopically, feldspar and quartz in the shear zone are characterized by ductile deformation. In larger scale, the top boundary is undulating. Shear sense in the top boundary is a two-way direction. Only the latest shear sense measured with c -axes of quartz show a consistent direction of top-to-the-north. The study provides some constraints to the exhumation process of the Dabie UHPM rocks.
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- 1995
13. Petrogenesis of ultrahigh-pressure rocks and their country rocks at Shuanghe in Dabieshan, Central China
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Zhao Zhongyan Zhao Zhongyan, Wang Qingchen, Zhai Mingguo, Brian F. Windley, R. N. Wilson, Dennis A. Carswell, and Cong Bolin
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Geochemistry and Petrology ,Geochemistry ,Central china ,Geology ,Petrogenesis - Published
- 1995
14. Petrological-tectonic units in the coesite-bearing metamorphic terrain of the Dabie Mountains, central China and their geotectonic implications
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Zhai Mingguo, Wang Qingchen, Zhao Zhongyan Zhao Zhongyan, Cong Bolin, Wang Gang, and Jiang Laili
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Metamorphic rock ,Geochemistry ,Metamorphism ,Granulite ,Basement (geology) ,Earth and Planetary Sciences (miscellaneous) ,General Earth and Planetary Sciences ,Shear zone ,Eclogite ,Geomorphology ,Geology ,Metamorphic facies ,General Environmental Science ,Gneiss - Abstract
Four main faults outline the metamorphic terrain in the Dabie Mountains, central China. The difference of metamorphic grade in the northern, central and southern parts is well-established. This study suggests that these metamorphic rocks belong to three individual geological-tectonic units, which are the northern Andean-type magmatic arc, the central UHPM rock-bearing melange zone and the mobilized sedimentary cover and basement of Yangtze southern continental margin. An old ductile sheared zone through Wuhe and the south of Yuexi-Shuihou divides the Dabie metamorphic complex into northern and central units. The northern unit is predominantly occupied by tonalitic-trondhjemitic grey gneisses and amphibolites facies metasediments. Several approximately E-W-trending ductile-sheared mylonitic belts cut through the grey gneisses, and are especially developed in the northern and southern margins of the unit (high-strain zones). There is a series of lenses of basic granulites, serpentinites and Grt-pyroxenites in the high-strain zones. They do not have the petrological and geochemical characteristics of ophiolitic rocks. However, they may represent the root of an arc combined with grey gneisses. Our study also demonstrates that all rocks from the northern block did not undergo eclogite facies metamorphism. Mesozoic post-collisional granites occur extensively in the Dabie terrain, especially in the northern unit. Coesite and diamond-bearing eclogites in the central unit indicate a regional ultra-high-pressure metamorphism of pressures of > 30 kbar and temperature of 600–800°C. Except for eclogites, various ultra-high-pressure metamorphic (UHPM) rocks include ultramafic rocks, marbles and other metamorphosed sedimentary rocks. They, as large-scale blocks, are mixed with lower P-T encompassing host rock orthogneisses. The central block is a UHPM rock-bearing melange zone. The south block is a metasedimentary sequence of continental margin of the Yangtze plate. The boundary between the central and southern blocks is located in the north from Huangzhen, extending eastwards through the dam of Huangliangting reservoir. In addition, the Foziling Group, north of the Dabieshan terrain was possibly deposited in an extensional basin on an extensional shear zone, comparable to the basin in the Variscan of France and the Caledonides of S. Norway (Dewey, Ryan and Anderson, Geological Society Special Publication No. 76, pp. 325–343, 1993). The authors hope that this information will provide more valid evidence of regional tectonic evolution.
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- 1995
15. The Northern Dabieshan Terrain: A Possible Andean-Type Arc
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Wang Qingchen, Zhang Qi, Cong Bolin, and Zhai Mingguo
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Arc (geometry) ,Back-arc basin ,Metamorphic rock ,Geochemistry ,Geology ,Terrain ,Petrology ,Gneiss - Abstract
The northern Dabieshan metamorphic terrain (NDT) is an analogue of an Andean-type magmatic arc. The predominant rock type is a trondhjemitic-tonalitic-granodioritic (TTG) gneiss with bodies of meta...
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- 1994
16. Ultra-high pressure metamorphic rocks in the Dabie-Su-Lu region, China: Their formation and exhumation
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Cong Bolin, Wang Qingchen, Zhang Ruyuan, Zhao Zhongyan Zhao Zhongyan, Zhai Mingguo, and Ye Kai
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Blueschist ,Metamorphic rock ,Geochemistry ,Metamorphism ,Geology ,Eclogite ,Petrology ,Granulite ,Protolith ,Metamorphic facies ,Gneiss - Abstract
Based on petrological, structural, geological and geochronological research, the authors summarize the progress of ultra-high pressure (UHP) metamorphic rock study since 1989 by Chinese geoscientists and foreign geoscientists in the Dabie-Su-Lu region. The authors introduce and discuss a two-stage exhumation process for the UHP metamorphic rocks that have various lithologies; eclogite, ultramafics, jadeitic quartzite, gneiss, schist and marble. The metamorphic history of UHP metamorphic rocks is divided into three stages, that is, the pre-eclogite stage, coesite eclogite stage, and retrograde stage. Prior to UHP metamorphism, the ultramafics had a high temperature environment assemblage of mantle and others had blueschist facies assemblages. The granulite facies assemblages, which have recorded a temperature increase event with decompression, have developed locally in the Weihai basaltic rocks. Isotopic ages show a long range from > 700 Ma to 200 Ma. The diversity in protoliths of UHP metamorphic rocks may be related to the variation of isotopic ages older than 400 Ma. The Sm-Nd dating of ~ 220 Ma could reflect the initial exhumation stage after the peak UHP metamorphism in relation to the collision between the Sino-Korean and Yangtze blocks and subsequent events. Petrological and structural evidence imply a two-stage exhumation process. During the initial exhumation, the UHP metamorphic rocks were sheared and squeezed up in a high P/T regime. In the second exhumation stage the UHP metamorphic rocks were uplifted and eventually exposed with middle crustal rocks.
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- 1994
17. Coesite-bearing granulite retrograded from eclogite in Weihai, eastern China
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Zhai Mingguo, Takao Hirajima, Nobuki Hiramatsu, Cong Bolin, Li Jiaju Li Jiaju, Zhao Zhongyan Zhao Zhongyan, Wang Qingchen, Masaki Enami, and Akira Ishiwatari
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Albite ,Geochemistry and Petrology ,Coesite ,engineering ,Geochemistry ,Plagioclase ,Epidote ,engineering.material ,Eclogite ,Omphacite ,Granulite ,Geology ,Hornblende - Abstract
Coesite in a granulite host-rock is reported from Weihai City, northeastern Shandong Province, China. Coesite occurs as inclusions in garnet, which is separated from the fine-grained matrix of quartz + clinopyroxene + homblende by a zoned corona of plagioclase + clinopyroxene + orthopyroxene + hornblende. Petrological evidence shows that the coesite-bearing granulite is retrograded from eclogite. Three stages in the metamorphic history of the granulite have been recognized. (i) Coesite-eclogite stage: The assemblage reconstructed from the inclusions in garnet is Mg-rich garnet + omphacite + coesite + rutile. (ii) During the granulite stage, these minerals reacted to form quartz + clinopyroxene + hornblende (in the matrix), clinopyroxene + albite (omphacite pseudomorphs) and plagioclase + clinopyroxene + orthopyroxene + hornblende (as corona around garnet). (iii) Amphibolite stage: Earlier minerals were replaced by biotite, epidote and hornblende. The P-T conditions estimated with various geothermobarometers show a T-increasing and P-decreasing path from the eclogite stage (T ∼ 720°C, P > 28 kbar) to the granulite stage (T ∼ 850°C, P ∼ 10 kbar). Thus the exhumation of the ultra-high-pressure rocks in Weihai proceeded under increasing temperature, and may not have been as fast as it was thought before
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- 1993
18. The distribution characteristics of turbulence on leeside of windbreaks
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Wang Ke, Wang Qingchen, Wang Zhengquan, and Zhang Yandong
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Horizontal and vertical ,Turbulence ,Forestry ,Mechanics ,Reynolds stress ,Windbreak ,Wind speed ,Nonlinear Sciences::Chaotic Dynamics ,Physics::Fluid Dynamics ,Distribution (mathematics) ,Distributive property ,Physics::Space Physics ,Intensity (heat transfer) ,Geology - Abstract
The distributive characteristics of turbulence, turbulent velocity, turbulent intensity and Reynolds stress, in horizontal and vertical direction on leeward side of windbreak were discussed in this paper. The results show that all the three kinds of parameters of turbulence have the similar distributive patterns in lee, their peaks were around 10H for horizontal andZ/ H = 1 for vertical. The windbreak is important barrier to affect the structure and distribution of wind speed and turbulence. Porosities of windbreaks could alter the patterns of turbulence, therefore, affect the abilities and functions of windbreaks.
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- 1992
19. Geodynamics of UHP-rock-bearing continental collision zone in central China
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Cong Bolin, Wang Qingchen, and Zhu Rixiang
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Bearing (mechanical) ,Continental collision ,law ,Earth science ,Geochemistry ,Central china ,Geodynamics ,Geology ,law.invention - Published
- 1998
20. Recent developments in study of the typical superimposed basins and petroleum accumulation in China: Exemplified by the Tarim Basin
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Wang Qingchen and Jin Zhijun
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geography ,geography.geographical_feature_category ,Geochemistry ,Structural basin ,Sedimentary basin ,Sedimentary depositional environment ,Tectonics ,Source rock ,Basin modelling ,Sedimentary basin analysis ,General Earth and Planetary Sciences ,Sedimentary rock ,Geomorphology ,Geology - Abstract
Most of petroliferous sedimentary basins in China have experienced multiple phases of tectonic evolution and deposition, and are characterized by tectonic and depositional superimposition. The term “superimposed basin” is suggested to describe those basins which consist of two or more simple prototype basins superimposing vertically and/or coalescing laterally. The characteristics of petroliferous superimposed basins are “multiple stages of basin forming and reworking, multiple layers of source rocks, multiple periods of hydrocarbon generation and expulsion, multiple periods of petroleum migration-accumulation-escape”. Therefore, applying the wave process analysis method to studying the process of basin formation, hydrocarbon generation, and reservoir formation, and then establishing theory of “petroleum accumulation system” is helpful to enhancing petroleum exploration efficiency in superimposed basins. This paper will, based on case study in the Tarim basin, report the major developments in studying basin formation, hydrocarbon generation and petroleum accumulation. In study of basin formation, (1) geophysical comprehensive profiles reveal that the Tarim plate has been subducted beneath the Tianshan orogenic belt with an interfinger structure and that the deep structure in the eastern section of the Tianshan orogenic belt is different from that in the western section. (2) The vertical variation in debris and geochemical composition reveals the nature and Mesozoic-Cenozoic evolution history of the Kuqa Depression. (3) Field investigation and paleostress reconstruction show that the Kuqa Depression has undergone gravity-driven extension in sedimentary cover when the Tianshan uplifted vertically. In hydrocarbon generation study, new developments include (1) setting environmental index to judge high grade source rocks in marine carbonates, and (2) establishing the lower limit of the organic carbon content for effective carbonate source rocks. In petroleum accumulation study, (1) methods of determining paleopressure and paleotemperature of forming fluid inclusions have been established. (2) The petroleum source analysis has indicated that the crude oil in the Lunnan and Tahe oilfields are derived from the source rocks of the Middle and Upper Ordovician. (3) Three generations of oil inclusions from the Lunnan oilfield have been recognized and dated.
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- 2004
21. A finite difference study on the basement structure beneath the Tianshan Orogen
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Gao Xing, Wang Qingchen, Pan Shuzhen, Duan Yonghong, Zhao Junmeng, and Jia Shixu
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geography ,geography.geographical_feature_category ,Finite difference ,Sediment ,Tarim basin ,Fault (geology) ,Structural basin ,Paleontology ,Tectonics ,Basement (geology) ,Upper crust ,General Earth and Planetary Sciences ,Geomorphology ,Geology - Abstract
We use the Pg seismic phase along the Korla-Jimsar profile across the Tianshan orogen and the 3D finite difference method to inverse the velocity structure of the upper crust beneath the basement of this mountain. Based on the velocity structure, the Korla-Jimsar profile can be divided into three parts, i.e. the north edge of the Tarim basin, the Tianshan orogen, and the south margin of the Junggar basin. Within the Tianshan there is a pattern of four convexities and three concavities, which correspond to the southern Tianshan, the Yanqi basin, the middle Tianshan, the Turpan basin, and the Bogda Mountains. In the north edge of the Tarim basin, the basement is about 10km deep with small lateral variations of velocity. In the Tianshan the velocity varies greatly laterally. The basement depth of the Yanqi basin is 6 km, which becomes shallow rapidly northward, and almost to the surface at the middle Tianshan. South to Kumux there is a small intermountain basin, where the maximum basement depth is 3 km, and also turns very shallow near Kumux. The Luntai fault, which bounds the Tarim basin and Tianshan, has vertical dislocation of about 5 km. The Turpan basin is covered with so thick a sediment that its basement is 7 km deep. The boundary fault between the Tianshan and Turpan is the Bolohoro fault which is characterized by quick deepening basement and 7 km vertical dislocation. In the Junggar basin the basement is 8 km deep. On the Korla-Jimsar profile, the velocity distribution of the upper crust and the structure are featured by NS symmetry on both sides of the axis of the Middle Tianshan, consistent with the deep structure revealed by this profile. It means that the Tarim basin and the Junggar basin underthrust toward the Tianshan from south and north, respectively. Such a structural style is different from that of another profile, i.e. the Xayar-Burjing profile, suggesting that there may be an important tectonic boundary between these two profiles.
- Published
- 2004
22. Geochronological constraint of Early Mesozoic tectonic event at Northeast Vietnam
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Chen, Zechao, Lin, Wei, Faure, Michel, Lepvrier, Claude, Yang Chu, Wang, Qingchen, State Key Laboratory of Lithospheric Evolution (SKL), Institute of Geology and Geophysics [Beijing] (IGG), Chinese Academy of Sciences [Beijing] (CAS)-Chinese Academy of Sciences [Beijing] (CAS), University Chinese Acad Science, Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre de Paris (iSTeP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)
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Song Chay belt ,[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics ,Early Mesozoic ,[SDE.MCG]Environmental Sciences/Global Changes ,Tectonic evolution ,Thrust ,South margin of South China Block - Abstract
International audience; The northeastern Vietnam, northeastern Guangxi, southwestern Guangdong and Hainan Island with NW-SE trending all locate in south margin of South China Block ( SCB). It is an important region to understanding the tectonic evolution of South China Block. Song Chay belt locates in the northeast region of Vietnam, a NE-SW mineral and stretching lineation, and top-to-the-NE ductile deformation are the main structures and observed both in Early Paleozoic lower metamorphism face strata and Late Paleozoic to Early Mesozoic unmetamorphozed sedimentary rocks. These structural characteristics were coeval with N/NE verging recumbent folds and nappes. Alike for the Song Chay belt, the same Early Mesozoic structural characteristics are also observed in Yunkai terrane, Hainan island and northeast region of Guangxi. All of these deformations occurred in the same tectonic event because of the time and the deformation style are almost the same. To decipher the time of this deformation, we study the structural character of deformed strata and granitic rocks, and analyzed the high quality U-Pb zircon geochronology data, then defined the time of nappes as 237 similar to 228Ma. The geodynamic of the tectonic event can be related to the collision between South China Block and Indochina in the Early Mesozoic time. We argue that South China Block subducted beneath to Day Nui Con Voi micro-continental block along Song Chay suture zone in Early Triassic, the south margin of SCB as the subduction plate were developed top to NE thrust and NE verging nappes. This orogeny is over at Late Triassic. Therefore, the northeastern Vietnam, northeastern Guangxi, southwestern Guangdong and Hainan island are belong to the southern margin of SCB and involved in the Indosinian orogenic belt.
23. Understanding and study perspectives on tectonic evolution and crustal structure of the Paleozoic Chinese Tianshan
- Author
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Wang, Qingchen, Shu, Liangshu, Charvet, Jacques, Faure, Michel, Ma, Huadong, Natal In, Boris, Gao, Jun, Kroner, Alfred, Xiao, Wenjiao, Li, Jinyi, Windley, Brian, Yan Chen, Glen, Richard, Jian, Ping, Zhang, W., Seltmann, Reimar, Wilde, Simon, Choulet, Flavien, Wan, Bo, Quinn, Cameron, Rojas-Agramonte, Yamirka, Shang, Qinghua, Zhang, Wei, Wang, Bo, Lin, Wei, State Key Laboratory of Lithospheric Evolution (SKL), Institute of Geology and Geophysics [Beijing] (IGG), Chinese Academy of Sciences [Beijing] (CAS)-Chinese Academy of Sciences [Beijing] (CAS), Department of Earth Sciences [Nanjing], Nanjing University (NJU), Institut des Sciences de la Terre d'Orléans (ISTO), Université de Tours-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), National 305 Project Office, ITU, Maden Fakultesi, ITU, Maden Fakultesi, Jeoloji Muhendisligi Bolumu, Institut für Geowissenschaften [Mainz], Johannes Gutenberg - Universität Mainz (JGU), Chinese Academy of Geological Sciences [Beijing] (CAGS), Ministry of Land and Resources (MLR), Department of Geology [Leicester], University of Leicester, Geological Survey of NSW, Shrimp Laboratory [Beijing], Institute of Geology [Beijing], Ministry of Land and Resources (MLR)-Ministry of Land and Resources (MLR)-Chinese Academy of Geological Sciences [Beijing] (CAGS), Ministry of Land and Resources (MLR)-Ministry of Land and Resources (MLR), Centre for Russian and Central EurAsian Mineral Studies, The Institute for Geoscience Research [Perth] (TIGeR), School of Earth and Planetary Science [Perth - Curtin university], Curtin University [Perth], Planning and Transport Research Centre (PATREC)-Planning and Transport Research Centre (PATREC)-Curtin University [Perth], Planning and Transport Research Centre (PATREC)-Planning and Transport Research Centre (PATREC), Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences [Changchun Branch] (CAS), State Key Laboratory for Mineral Deposits Research, Chinese National 973 Project no. 2009CB825008 and NSFC (40872142,90714007)., POTHIER, Nathalie, and Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS)
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[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics ,010504 meteorology & atmospheric sciences ,[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics ,General Earth and Planetary Sciences ,010502 geochemistry & geophysics ,01 natural sciences ,0105 earth and related environmental sciences - Abstract
International audience; The Chinese Tianshan Belt is one of the key regions for the understanding of tectonics of the Central Asian Orogenic Belt (CAOB). An international field excursion and workshop were organized to conduct a common observation and discussion on the tectonic evolution of the Chinese Tianshan. This report summarizes the main achievements, including acknowledged geological features, controversial and remaining scientific problems, and discussion of a tentative geodynamic model. Thus, it is helpful to clarify what has been done in the past, what should be improved and what needs to be done in the future and therefore to better understand the tectonics of the Chinese Tianshan Belt and the CAOB as well.
24. Tectonic evolution of the Early Mesozoic Xuefengshan belt: Insights from structural analysis and geochronological constraints
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Yang Chu, Lin, Wei, Faure, Michel, and Wang, Qingchen
Catalog
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