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Tectonic rotation in the western South-Dabashan orogenic belt in late Mesozoic

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Chinese Science Bulletin 2010年第14期55卷 1423-1429页

作者： WANG Bin zhang guowei Department of Geology Northwest University Xi'an 710069 China

A paleomagnetic study was carried out on Early-Middle Jurassic sediments in the Zhenba area, the western South-dabashan orogenic belt. Stepwise thermal demagnetization isolated the characteristic high temperature component (HTC) (D=37.1°,I=46.1°, α95=10.1°), which passed the fold test. By comparing the corresponding pole of HTC (57.6°N, 196.6°E, A95=9.9°) with coeval reference poles for the Sichuan basin, we detected a 26.5°±9.0° clockwise rotation of the study area relative to the stable Sichuan basin. We interpret that this rotation was caused by obstruction of the Hannan block during thrusting of the Dabashan, and occurred around Early Cretaceous.

关键词：顺时针旋转大巴山晚中生代西部造山带构造四川盆地中侏罗世

Process of Rifting and Collision along Plate Margins of the Qinling Orogenic Belt and Its Geodynamics

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Acta Geologica Sinica(English Edition) 1999年第3期73卷 275-288页

作者： LIU Shaofeng zhang guowei Earth Science and Resource Faculty China University of Geosciences Beijing 100083 Northwest University Xi'an 710069

The Qinling orogenic belt underwent complicated processes of rifting and collision, as shown by the coexistence of 1 ocean extension and plate margin rifting and 2 subduction of the frontal oceanic crust and extension of the rear plate margin. These resulted in a basin-mountain framework characterized by the coexistence of plates separated by the ocean basin and continental blocks demarcated by the rifting sea trough in the marginal region and the coexistence of subduction orogeny and ocean extension. Generally speaking, the plate marginal area between the North China plate and Yangtze plate continually rifted from north to south and the rifted micro-plates continually accreted northwards. This especial orogenic process was probably controlled by two events of deep mantle geodynamic adjustment and mantle plume activities, which occurred in the Shangdan suture belt and Mianlüe suture belt from north to south respectively.

关键词： rift subduction lateral accretion vertical accretion mantle plume

Radically distributed value and normal families of meromorphic functions

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Frontiers of Mathematics in China 2014年第2期9卷 355-376页

作者： Jianming QI guowei zhang Weniun YUAN Department of Mathematics and Physics Shanghai Dianji University Shanghai 200240 China School of Mathematics and Information Sciences Guangzhou UniversityGuangzhou 510006 China Department of Mathematics Anyang Normal University Anyang 455000 China Key Laboratory of Mathematics and Interdisciplinary Sciences of Guangdong Higher Education Institutes Guangzhou University Guangzhou 510006 China

We establish several upper-bound estimates for the growth of meromorphic functions with radially distributed value. We also obtain a normality criterion for a class of meromorphic functions, where any two of whose dif... 详细信息

关键词： Meromorphic function Nevanlinna theory normal family angular characteristic function radially distributed value

Genesis of the Madang Cenozoic sodic alkaline basalt in the eastern margin of the Tibetan Plateau and its continental dynamic implications

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Science China Earth Sciences 2007年第Z2期50卷 314-321页

作者： LAI ShaoCong zhang guowei LI YongFei QIN JiangFeng State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China

The Madang Cenozoic sodic alkaline basalt occurred in the eastern margin of the Tibetan Plateau, where is a key tectonic transform region of Tibet, North China, and Yangtze blocks. The basalts are characterized by the variation in SiO2=42%―51%, Na2O/K2O>4, belonging to the sodic alkaline basalt series. The rocks are enriched in Ba, Th, Nb, Ta, relative to a slight depletion in K, Rb in the trace and rare earth element (REE) spider diagrams that are similar to the typical oceanic island alkaline basalt. The Sr-Nd-Pb isotopic compositions suggest that they are derived from a mixed mantle reservoir. The western Qinling-Songpan tectonic region was controlled by Tibet, North China and Yangtze blocks since Cenozoic, therefore, the region was in the stage of the substance converge from the mantle to upper crust, producing a mixed mantle reservoir in the studied area. The Madang basalts occurred in the specific tectonic background, they result from partial melting of a mixed asthenospheric mantle reservoir in the western Qinling-Songpan tectonic node.

关键词： alkaline basalt, source region characteristics, continental dynamism, Cenozoic,eastern margin of Tibetan Plateau

West Pacific and North Indian Ocean Seafloor and Their Ocean-Continent Connection Zones: Evolution and Debates

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Acta Geologica Sinica(English Edition) 2017年第6期91卷 2283-2301页

作者： zhang guowei LI Sanzhong GUO Anlin SUO Yanhui State Key Laboratory of Continental Dynamics/Department of Geology Northwest University Key Lab of Submarine Geosciences and Prospecting Techniques MOE College of Marine GeosciencesOcean University of China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology

The Indian Ocean and the West Pacific Ocean and their ocean-continent connection zones are the core area of ＂the Belt and Road＂. Scientific and in-depth recognition to the natural environment, disaster distribution, resources, energy potential of ＂the Belt and Road＂ development, is the cut-in point of the current Earth science community to serve urgent national needs. This paper mainly discusses the following key tectonic problems in the West Pacific and North Indian oceans and their ocean-continent connection zones （OCCZs）： 1. modern marine geodynamic problems related to the two oceans. Based on the research and development needs to the two oceans and the ocean-continent transition zones, this item includes the following questions. （1） Plate origin, growth, death and evolution in the two oceans, for example, 1） The initial origin and process of the triangle Pacific Plate including causes and difference of the Galapagos and West Shatsky microplates; 2） spatial and temporal process, present status and trends of the plates within the Paleo- or Present-day Pacific Ocean to the evolution of the East Asian Continental Domain; 3） origin and evolution of the Indian Ocean and assembly and dispersal of supercontinents. （2） Latest research progress and problems of mid-oceanic ridges： 1） the ridge-hot spot interaction and ridge accretion, how to think about the relationship between vertical accretion behavior of thousands years or tens of thousands years and lateral spreading of millions years at 0 Ma mid- oceanic ridges; 2） the difference of formation mechanisms between the back-arc basin extension and the normal mid-oceanic ridge spreading; 3） the differentials between ultra-slow Indian Ocean and the rapid Pacific spreading, whether there are active and passive spreading, and a push force in the mid-oceanic ridge; 4） mid-oceanic ridge jumping and termination： causes of the intra-oceanic plate reorganization, termination, and spatial jumps; 5） interaction of mantle plume and

关键词： the Belt and Road Indian Ocean West Pacific Ocean ocean-continent connection zone,seafloor marine geodynamics

Geochemistry of the ophiolite and oceanic island basalt in the Kangxian-Pipasi-Nanping tectonic mélange zone, South Qinling and their tectonic significance

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Science China Earth Sciences 2004年第2期47卷 128-137页

作者： LAI Shaocong zhang guowei PEI Xianzhi YANG Haifeng Key Laboratory of Continental Dynamics Ministry of Education and Department of Geology Northwest University Xi'an 710069 China

Detailed studies indicate that Kangxian-Pipasi-Nanping tectonic zone is a complicated mélange zone which includes many tectonic slabs of different origins. Ophiolite (MORB-type basalt), oceanic island tholeiite and alkaline basalt have been identified. Moreover, this tectonic mélange zone is eastward connected with the Mianlüe suture zone. The deformation characteristics, consisting components and volcanic rock geochemical features for the Kangxian-Pipasi-Nanping tectonic mélange zone are much similar to those of the Mianlüe suture zone and Deerni ophiolite. Therefore, the Kangxian-Pipasi-Nanping tectonic mélange zone should be the westward extension part of the Mianlüe suture zone. It indicates that the Mianlüe suture zone had extended to the Nanping area.

关键词： ophiolite and volcanic rock geochemistry tectonic settings Kangxian-Pipasi-Nanping Mianlüe suture zone

Cenozoic basin development and its indication of plateau growth in the Xunhua-Guide district

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Science China Earth Sciences 2007年第Z2期50卷 277-291页

作者： LIU ShaoFeng zhang guowei P.L.HELLER State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China College of Geosciences and Resources China University of Geosciences Beijing 100083 China Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education China University of Geosciences Beijing 100083 China Department of Geology Northwest University Xi'an 710069 China Department of Geology and Geophysics University of Wyoming Laramie Wyoming 82071 USA

The Xunhua, Guide and Tongren Basins are linked with the Laji Mountain and the northern West Qinling thrust belts in the Xunhua-Guide district. Basin depositional stratigraphy consists of the Oligocene Xining Group, the uppermost Oligocene-Pliocene Guide Group and the Lower Pleistocene. They are divided into three basin phases by unconformities. Basin phase 1 is composed of the Xining Group, and Basin phase 2 of the Zharang, Xiadongshan, Herjia and Ganjia Conglomerate Formations in the Guide Group, and Basin phase 3 of the Gonghe Formation and the Lower Pleistocene. Three basin phases all develop lacustrine deposits at their lower parts, and alluvial-braided channel plain depositional systems at upper parts, which constitute a coarsening-upward and progradational sequence. Basin deposition, paleocurrent and provenance analyses represent that large lacustrine basin across the Laji Mountain was developed and sourced from the West Qinling thrust belt during the stage of the Xining Group (Basin phase 1), and point-dispersed alluvial fan-braided channel plain deposition systems were developed beside the thrust and uplifted Laji Mountain and sourced from it, as thrusting migrated northwards during the stage of the Guide Group (Basin phase 2). Evolution of basin-mountain system in the study area significantly indicates the growth process of the distal Tibetan Plateau. The result shows that the Tibetan Plateau expanded to the northern West-Qinling at Oligocene (29―21.4 Ma) by means of northward folded-and-thrust thickening and uplifting and frontal foreland basin filling, and across the study area to North Qilian and Liupan Mountain at the Miocene-Pliocene (20.8―2.6 Ma) by means of two-sided basement-involved-thrust thickening and uplifting and broken foreland basin filling, and the distant end of Tibetan Plateau behaved as regional erosion and intermontane basin aggradational filling during the Pliocene and early Pleistocene (2.6―1.7 Ma).

关键词： Xunhua-Guide district, Cenozoic basins, provenance analysis, basin-mountain evolution, plateau growth

Isotope chronological trace of granite gravel in Hefei Basin

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Chinese Science Bulletin 2001年第20期46卷 1716-1722页

作者： LIU Shaofeng zhang guowei zhang Zongqing SU Shangguo China University of Geosciences Beijing 100083China Northwest University Xi’an 710069China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

The discovery of granite gravel in Hefei Jurassic backland basin, which came from the Dabie Shan or North Huaiyang, has a great significance for probing into uplift and exhumation of the Dabie orogenic belt. Litho-chemical and isotope chronological analyses on the granite gravel in the Sanjianpu Formation and the Fenghuangtai Formation in Jinzhai County prove that post-orogenic granite was developed in the major provenance of the Hefei Basin; that is, Dabie Shan or North Huaiyang. Discordant lower intersection point age of zircon U-Pb of granite gravel is about 214 Ma, and 40Ar/39Ar age of muscovite about 196 Ma, K-Ar age of K-spar about 181 Ma. The former is the diagenetic age of the sample, and the latter two represent the sealed ages of muscovite and K-spar respectively. The age of sedimentary rocks in which a lot of granite gravels appear in the sedimentary section may represent the newest age of the exhumation of the granite body, so we assume that the age is 166 Ma. Therefore, we calculated the

关键词： Hefei Basin gravel provenance isotope chronological trace.

Numerical simulation of the soliton solutions for a complex modified Korteweg—de Vries equation by a finite difference method

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Communications in Theoretical Physics 2021年第2期73卷 41-51页

作者： Tao Xu guowei zhang Liqun Wang Xiangmin xu Min Li State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China College of Science China University of PetroleumBeijing 102249China Department of Mathematics and Physics North China Electric Power UniversityBeijing 102206China

In this paper,a Crank-Nicolson-type finite difference method is proposed for computing the soliton solutions of a complex modifed Korteweg de Vries(MKdV)equation(which is equivalent to the Sasa-Satsuma equation)with the vanishing boundary *** is proved that such a numerical scheme has the second order accuracy both in space and time,and conserves the mass in the discrete ***,the resuling scheme is shown to be unconditionally stable via the von Nuemann *** addition,an iterative method and the Thomas algorithm are used together to enhance the computational *** numerical experiments,this method is used to simulate the single-soliton propagation and two-soliton collisions in the complex MKdV *** numerical accuracy,mass conservation and linear stability are tested to assess the scheme's performance.

关键词： complex modified Korteweg-de Vries equation finite difference method soliton solutions