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The Late Triassic Sequence-Stratigraphic Framework of the Upper Yangtze Region,South China

Acta Geologica Sinica(English Edition) 2017年第1期91卷 51-75页

作者： MEI Mingxiang liu shaofeng School of Earth Sciences and Resources China University of Geosciences

In the transitional period between the Middle and the Late Triassic, the Indochina orogeny caused two tectonic events in South China:(1) the formation and uplift of the Qinling-Dabie orogenic belt along the northern margin of the South China Plate, due to its collision with the North China Plate; and 2) the development of a 1300-km-wide intra-continental orogen in the southeastern part of the South China Plate, which led to a northwestward movement of the foreland thrust-fold zone. These tectonic events resulted in the ending of the Yangtze Platform, and were a stable paleogeographic factor from the Eidacaran to the end of the Middle Triassic. This platform was characterized by the widespread development of shallow-water carbonates. After the end of the Yangtze Platform, the upper Yangtze foreland basin(or Sichuan foreland basin) was formed during the Late Triassic and became a accumulation site of fluvial deposits that are composed of related strata of the Xujiahe Formation. In western Sichuan Province, the Xujiahe Formation overlies the Maantang Formation shallow-water carbonate rocks of the Xiaotangzi Formation siliciclastic rocks(from shelf shales to littoral facies). The sequence-stratigraphic framework of the Upper Triassic in the upper Yangtze foreland basin indicates a particular alluvial architecture, characterized by sequences composed of(1) successions of low-energy fluvial deposits of high-accommodation phases, including coal seams, and(2) high-energy fluvial deposits of low-accommodation phases, including amalgamated river-channel sandstones. The spatial distribution of these fluvial deposits belonging to the Xujiahe Formation and its relative strata is characterized by gradual thinning-out, overlapping, and pinching-out toward both the east and south. This sedimentary record therefore expresses a particular sequence-stratigraphic succession of fluvial deposits within the filling succession of the foreland basin. The sequence-stratigraphic framework for

关键词： Late Triassic sequence-stratigraphic framework upper Yangtze foreland basin upper Yangtze region South China

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A Research Review of Iron Oxide Copper-Gold Deposits

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Acta Geologica Sinica(English Edition) 2016年第4期90卷 1341-1352页

作者： liu shaofeng FU Shuixing Beijing Institute of Geology for Mineral Resources Beijing 100012 China

Iron oxide copper-gold （IOCG） deposits are a research focus of the current ore deposit geology, and have attracted much attention among the worldwide geologists and exploration experts due to their shallow depth, a wide variety of mineral species and large scale. This paper presents a review of the present IOCG deposits research, which includes the definition of IOCG deposits, temporal and spatial distribution, ore-forming environments, ore-forming magmatic rocks, their geological features, ore-controlling structures and ore-bearing rocks, mineralized alteration zoning, and their genesis and ore-forming process. This work also proposed the ore prospecting direction of IOCG deposits from a trinity model of metaUogenic geological bodies, metallogenic structure surface and metailogenic information signs, and discussed the existing problems of the IOCG deposits research.

关键词： IOCG deposits geological features ore-forming environments ore-forming process prospecting model

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Syn-tectonic sedimentation and its linkage to fold-thrusting in the region of Zhangjiakou, North Hebei, China

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Science China Earth Sciences 2018年第6期61卷 681-710页

作者： shaofeng liu Chengfa LIN Xiaobo liu Qitian ZHUANG School of Earth Sciences and Resources China University of Geosciences (Beijing) Institute of Geomechanics Chinese Academy of Geological Sciences

The timing of the "Yanshanian Movement" and the tectonic setting that controlled the Yanshan fold-and-thrust belt during Jurassic time in China are still matters of controversy. Sediments that filled the intramontane basins in the Yanshan belt perfectly record the history of "Yanshanian Movement" and the tectonic background of these basins. Recognizing syn-tectonic sedimentation, clarifying its relationship with structures, and accurately defining strata ages to build up a correct chronostratigraphic framework are the key points to further reveal the timing and kinematics of tectonic deformation in the Yanshan belt from the Jurassic to the Early Cretaceous. This paper applies both tectonic and sedimentary methods on the fold-and-thrust belt and intramontane basins in the Zhangjiakou area, which is located at the intersection between the western Yanshan and northern Taihangshan. Our work suggests that the pre-defined "Jurassic strata" should be re-dated and sub-divided into three strata units: a Late Triassic to Early Jurassic unit, a Middle Jurassic unit, and a Late Jurassic to early Early Cretaceous unit. Under the control of growth fold-and-thrust structures, five types of growth strata developed in different growth structures: fold-belt foredeep type,thrust-belt foredeep type, fault-propagation fold-thrust structure type, fault-bend fold-thrust structure type, and fault-bend foldthrust plus fault-propagation fold composite type. The reconstructed "source-to-sink" systems of Late Triassic to Early Jurassic,Middle Jurassic and Late Jurassic to early Early Cretaceous times, which are composed of a fold-and-thrust belt and flexure basins, imply that the "Yanshanian Movement" in our study area started in the Middle Jurassic. During Middle Jurassic to early Early Cretaceous times, there have been at least three stages of fold-thrust events that developed "Laramide-type" basementinvolved fold-thrust structures and small-scale intramontane broken "axial basins". The west

关键词： Yanshan-Taihangshan Fold-and-thrust belt Flexural basin Growth strata Source-to-sink system Thick-skinned fold-and-thrust belt

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Mechanical model of organ of Corti

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Applied Mathematics and Mechanics(English Edition) 2017年第6期38卷 867-876页

作者： Yiqiang CHEN Wenjuan YAO shaofeng liu Department of Civil Engineering Shanghai University

According to the vibration characteristics of the organ of Corti （OC）, seven hypotheses are made to simplify the structure of the model, and a mechanical OC model is established. Using the variational principle, a displacement analytical expression is solved under a certain pressure. The results are in good agreement with experimental data, showing the validity of the formula. Combined with the damage caused by noise in clinic, it is found that the hardening of outer hair cells and outer stereocilia can lead to loss of hearing and generation of threshold shift. In addition, the results show that high frequency resonance occurs at the bottom of the basilar membrane （BM）, and low frequency resonance occurs at the top of the BM. This confirms the frequency selective characteristics of the BM. Further, using this formula can avoid interference of the envi- ronment and the technical level of the test personnel, and can evaluate performance of the OC objectively.

关键词： organ of Corti (OC) variational principle hardening of outer hair cells(OHCs) hardening of outer stereocilia threshold shift

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Growth structures and growth strata of the Qianjiadian Basin in the western Yanshan fold and thrust belt, North China

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Science China Earth Sciences 2019年第7期62卷 1092-1109页

作者： Xiaofei SHI shaofeng liu Chengfa LIN State Key Laboratory of Geological Processes and Mineral Resources and School of Geosciences and Resources China University of Geosciences (Beijing)

The northwestward subduction of the Izanagi Plate beneath the eastern Eurasian Plate during the Late Mesozoic caused a series of compressional deformation events in the Yanshan fold and thrust belt(YFTB), but the tectonic deformation timing, tectonic properties and relationship between tectonic uplift and sediment accumulation in the intermontane basins continue to be debated. For this reason, the sedimentology, sediment provenance, and basin structure of the Qianjiadian Basin(QJB) in the northern Beijing region during the Late Jurassic and Early Cretaceous were studied in detail. The results suggest that a fault-propagation fold-type(FPFT) growth structure and growth strata developed on the western edge of the QJB and that the top part of Member 2 and Member 3 of the Tuchengzi Formation are growth strata controlled by the limb rotation mechanism. In two small thrust faults in the QJB, the Mesoproterozoic Xiamaling Formation is thrust over the Tuchengzi Formation, and these faults may have controlled the development of the fault-bend fold-type growth strata. An analysis of the "source-to-sink" process suggests that the hanging wall succession of the Shangyi-Pingquan fault(SPF) was the main source area of the Late Jurassic to early Early Cretaceous strata in the QJB. A zircon206 Pb/238 U age of 140.8±2.4 Ma for the volcanic rocks at the bottom of the FPFT growth strata represents the timing of the initiation of FPFT growth structure development. The discovery of the FPFT growth structure and growth strata in the QJB indicate that the QJB was an intermontane flexural basin controlled by fold and thrust structures during the early Early Cretaceous. Near the E-W-trending SPF, the NE-SW-trending Qianjiadian thrust fault(QJTF) and two small intrabasinal thrust faults may constitute a unified right-lateral strike-slip system that formed in response to the northwestward flat subduction of the Izanagi Plate beneath the East Asian continent during the Jurassic-Early Cretaceou

关键词： Yanshan fold and thrust belt Qianjiadian Basin Tuchengzi Formation Growth structure Growth strata Izanagi Plate

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Numerical simulation of Corti stimulated by fluid in tunnel of Corti

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Applied Mathematics and Mechanics(English Edition) 2017年第5期38卷 737-748页

作者： Yiqiang CHEN Wenjuan YAO shaofeng liu Department of Civil Engineering Shanghai UniversityShanghai 200444China

In this paper, the effect of fluid in a tunnel of Corti （TC） on organ of Corti （OC） is studied. A three-dimensional OC model including basilar membrane （BM）, tectorial membrane （TM）, inner and outer hair cells （OHCs）, and reticular lamina （RL） is established by COMSOL. An initial pressure is applied to the fluid in the TC. The frequency response of the structure is analyzed, and the displacement of the BM is achieved. The results are in good agreement with the experimental data, confirming validity of the finite element model. Based on the model, the effect of fluid in the TC on the OC is studied. The results show that, when the pressure gradient is absent in the fluid, with the increase of the initial fluid pressure, the displacement of the BM increases. However, when the initial fluid pressure increases to a certain value, the increase rate of the displacement of the BM becomes very slow. The movement of the fluid amplifies the BM movement. Furthermore, the movement of the fluid can strengthen the movement of the OHCs and the shear movement of the stereocilia, especially in the vicinity of the characteristic frequency at which the amplification effect reaches a peak. Nevertheless, a pressure gradient in the fluid affects the BM movement.

关键词： tunnel of Corti (TC) organ of Corti (OC) frequency response fluidpressure

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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

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Evaluation of Atmosphere–Land Interactions in an LES from the Perspective of Heterogeneity Propagation

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Advances in Atmospheric Sciences 2016年第5期33卷 571-578页

作者： shaofeng liu Michael HINTZ Xiaolong LI Institute of Geophysics and Meteorology University of Cologne National Satellite Meteorological Center China Meteorological Administration

Atmosphere–land interactions simulated by an LES model are evaluated from the perspective of heterogeneity propagation by comparison with airborne measurements. It is found that the footprints of surface heterogeneity, though as 2D patterns can be dissipated quickly due to turbulent mixing, as 1D projections can persist and propagate to the top of the atmospheric boundary layer. Direct comparison and length scale analysis show that the simulated heterogeneity patterns are comparable to the observation. The results highlight the model＇s capability in simulating the complex effects of surface heterogeneity on atmosphere–land interactions.

关键词： atmosphere–land interaction heterogeneity large-eddy simulation

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Titanium Complexes Bearing NNO-Tridentate Ligands: Highly Active Olefin Polymerization Catalysts with Great Control on Molecular Weight and Distribution

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Chinese Journal of Chemistry 2022年第23期40卷 2785-2793,I0002页

作者： Jiliang Tian Wenzheng Feng shaofeng liu Zhibo Li Key Laboratory of Biobased Polymer Materials College of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdaoShandong 266042China College of Chemical Engineering Qingdao University of Science and TechnologyQingdaoShandong 266042China

A series of titanium amido complexes (1-Ti(NMe_(2))_(2) to 4-Ti(NMe_(2))_(2)) bearing NNO-tridentate ligands was synthesized from the reactions of phenoxy-imine-amine ligands with one equivalent of Ti(NMe_(2))_(4). Subsequently, titanium dichloride complexes (1-TiCl_(2) to 4-TiCl_(2)) were prepared by treatment of titanium amido complexes with excess Me3SiCl in toluene. All metal complexes were characterized by 1H and 13C NMR spectroscopy, and the molecular structures of complexes of 2-Ti(NMe_(2))_(2), 2-TiCl_(2), and 4-TiCl_(2) in the solid state were determined by single-crystal X-ray diffraction. Upon activation with MAO, titanium dichloride complexes as single-site catalysts were extremely active toward ethylene homopolymerization with great control on molecular weight and distribution. In particular, 3-TiCl_(2)/MAO exhibited an activity as high as 1.35 × 108 g(PE)·mol−1(Ti)·h−1 at 70°C and produced polyethylene with high molecular weight (41.7 × 10^(4) g∙mol^(−1)) and very narrow distribution (Đ = 1.23). In the presence of 1-octene as comonomer, linear low-density polyethylenes (LLDPEs) with ultrahigh molecular weights (Mw = 136—326 × 10^(4) g∙mol^(−1)) and narrow distributions (Đ = 1.20—1.50) were successfully synthesized.

关键词： Titanium Homogeneous catalysis Polymerization UHMWPE LLDPE

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Geological Database for Plate Tectonic Reconstruction:A Conceptual Model

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Acta Geologica Sinica(English Edition) 2019年第S01期93卷 66-69页

作者： WANG Ping liu shaofeng School of Geography Nanjing Normal UniversityNanjingJiangsu 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application NanjingJiangsu 210023China State Key Laboratory of Geological Processes and Mineral Resourcesand School of Geosciences and Resources China University of Geosciences(Beijing)Beijing 100083China

We all live on one planet and geology has no *** that reside on different continents share the same architecture beneath the surface;they were once neighbors with common *** geological data are now freely available to everyone for the benefit of society,demonstrating that geoscience can address both global and regional *** increasingly large datasets("Big Data")provide clear opportunities(e.g.,Spina,2018).

关键词： Plate Tectonic Reconstruction Big Data GML data model feature class

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