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gravity flow on Slope and Abyssal Systems in the Qiongdongnan Basin,Northern South China Sea

Acta Geologica Sinica(English Edition) 2011年第1期85卷 243-253页

作者： SU Ming XIE Xinong LI Junliang JIANG Tao ZHANG Cheng HE Yunlong TIAN Shanshan ZHANG Cuimei Key Laboratory of Tectonics and Petroleum Resources （China University of Geosciences） Ministry of Education Wuhan 430074 China CAS Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Department of Technology Zhanjiang Branch of CNOOC Zhanjiang 524057 China

The study of new seismic data permits the identification of sediment gravity flows in terms of internal architecture and the distribution on shelf and abyssal setting in the Qiongdongnan Basin （QDNB）. Six gravity flow types are recognized：（1） turbidite channels with a truncational basal and concordant overburden relationship along the shelf edge and slope, comprising laterally-shifting and vertically-aggrading channel complexes; （2） slides with a spoon-shaped morphology slip steps on the shelf-break and generated from the deformation of poorly-consolidated and high water content sediments; （3） slumps are limited on the shelf slope, triggered either by an anomalous slope gradient or by fault activity; （4） turbidite sheet complexes （TSC） were ascribed to the basin-floor fan and slope fan origin, occasionally feeding the deep marine deposits by turbidity currents; （5） sediment waves occurring in the lower slope-basin floor, and covering an area of approximately 400 km2, were generated beneath currents flowing across the sea bed; and （6） the central canyon in the deep water area represents an exceptive type of gravity flow composed of an association of debris flow, turbidite channels, and TSC. It presents planar multisegment and vertical multiphase characteristics. Turbidite associated with good petrophysical property in the canyon could be treated as a potential exploration target in the QDNB.

关键词： gravity flow slope and abyssal system Qiongdongnan Basin South China Sea

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gravity flow of pulsatile blood through a porous medium under periodic body acceleration and magnetic field in an inclined tube

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International Journal of Biomathematics 2016年第2期9卷 139-157页

作者： Shakera Tanveer V. P. Rathod Department of Mathematics Government First Grade CollegeAfzalpur 585301 Gulbarga Karnataka India Department of MathematicsCNCS Haramaya University Ethiopia

Mathematical model for the pulsatile blood flow through a porous medium under the influence of periodic body acceleration for gravity flow along an inclined tube by considering blood as a couple stress, incompressible and electrically conducting fluid in the presence of magnetic field has been investigated. Analytical expressions for axial velocity, flow rate, fluid acceleration and shear stress are obtained by applying the Laplace and finite Hankel＇s transforms. The velocity profiles for various values of Hartmann number, couple stress parameters and the angle of inclination are shown graphically. Also the effects of body acceleration, Womerseley parameters and permeability parameters have been discussed. The results obtained in the present mathematical model for different values of the parameters involved in the problem show that the flow of blood is influenced by the effect of magnetic field, the porous medium and the inclination angle. The present model is compared with the other existing models. Through this theoretical investigation, the applications of magnetic field have also been indicated in the field of biological, biomedical and engineering sciences.

关键词： Magnetic field body acceleration porous media couple stress fluid inclination angle gravity flow blood-borne diseases.

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Sedimentary characteristics of lacustrine deep-water gravity flow in the third member of Paleogene Shahejie Formation in Dongying Sag,Bohai Bay Basin,China

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Frontiers of Earth Science 2023年第2期17卷 487-504页

作者： Yuanpei ZHANG Chuanhua LI Xuecai ZHANG Xuqing FANG Yong WANG Jinliang ZHANG Jun XIE Jinkai WANG College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Sinopec Shengli Oilfield Co. Dongying 257000China Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China

Many types of sedimentary systems occur in the middle of the third member of the Shahejie Formation(E_(2)S_(3)^(2))of the Paleogene in the Dongying Sag east of the Bohai Bay *** to the topography and material supply,traction and gravity flow depositions are intertwined in this area,and the sand body types are complex and diverse,making it challenging to improve the accuracy of their description and prediction and restricting oil reservoir exploration and ***,this paper documents our systematic study of the sedimentary characteristics of the southern slope of Dongying Depression,the formation mechanism of different sand body types,and the prediction of sand body ***,according to the coring well’s single-well facies and vertical rock sequence,nine single lithofacies types and five lithofacies association types were *** with the well logging facies marks of all wells,the depositional models of delta and gravity flow depositional systems were established in the study ***,the gravity flow was divided into slip,collapse,debris flow,and turbidity flow according to its development ***,the distribution law of the gravity flow sedimentary facies type was *** flow sliding deposits are primarily distributed near the delta front,slump and clastic flow deposits are distributed near the far slope,and turbidity current deposits are distributed at the far *** the gradual shrinkage of the water body in the north-west direction and the continuous advancement of the river delta,the gravity flow sand body gradually disappears in the late E_(2)S_(3)^(2) and transits to delta plain deposition.

关键词： Dongying Sag gravity flow sedimentary characteristics Bohai Bay Basin

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Sedimentary Characteristics and Model of gravity flow Depositional System for the First Member of Upper Miocene Huangliu Formation in Dongfang Area, Yinggehai Basin, Northwestern South China Sea

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Journal of Earth Science 2014年第3期25卷 506-518页

作者： Ming Sun Hua Wang Jihua Liao Huajun Gan Jun Xiao Jinfeng Ren Shu'e Zhao Key Laboratory of Tectonics and Petroleum Resources Ministry of Education China University of Geosciences Guangzhou Marine Geological Survey Faculty of Earth Resources China University of Geosciences CNOOC Research Institute

The gravity flow deposit were mainly developed in the lowstand systems tract（LST） of the first member of Upper Miocene Huangliu Formation（Ehl1） in Dongfang area, Yinggehai Basin, has become a valuable target for gas exploration and production. The gravity flow sedimentary characteristics of lithofacies associations, sedimentary texture, seismic facies and logging facies were described in detail on the basis of integrated analysis of cores, logging and seismic data. The sedimentary microfacies types composed of neritic sandbar, continental shelf mud, main channel, bifurcated or cross-cutting distributary channel, overspill, and natural levee are revealed under the constraint of high resolution sequence stratigraphic framework in the Ehl1. The gravity flow deposit system in the LST is divided into three evolution stages corresponding to periods of three parasequence sets. The gravity flow deposit was induced in the early LST, expanded rapidly in the middle LST and decreased slightly in the late LST. But its developing scale decreased sharply in the transgression systems tract（TST） and finally vanished in the highstand systems tract（HST）. This spatial evolution rule is constrained by the integrated function of sediments supply of the Vietnam Blue River in the LST, the development of local gradient change in sea floor（micro-topography, i.e., flexure slope break）, and the fall in relative sea level. On the basics of the deep study of the coupling relationship among the three main control factors, the sedimentary model is established as an optimal component of ＂source-channel-sink＂ for shallow marine turbidite submarine fan.

关键词： Yinggehai Basin Dongfang area the first member of Upper Miocene Huangliu Formation(Ehl1) sedimentation characteristics gravity flow sedimentary model.

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Seismic geomorphology and main controls of deep-water gravity flow sedimentary process on the slope of the northern South China Sea

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Science China Earth Sciences 2012年第10期55卷 747-757页

作者： LI Lei WANG YingMin XU Qiang ZHAO JingZhou LI Dong School of Petroleum Resources Xi'an Shiyou UniversityXi'an 710065China College of Geosciences China University of PetroleumBeijing 102249China CNOOC Research Institute Beijing 100027China

The Quaternary continental slope of the Baiyun Sag in northern South China Sea is characterized by a complex topography and abundant gravity flow ***-resolution 3-D seismic data in this area allow for a detailed study of the seismic geomorphology and deep-water gravity flow depositional *** Quaternary continental slope in the northern South China Sea is an above-graded *** intraslope basin lies within the above-grade continental ***,erosion,and deposition processes tend to develop a gentle topography and consequently a graded *** upper continental slope,which is above the slope equilibrium profile,is dominated by erosion and ***,slumps and erosional channels are developed within this continental *** intraslope basin is located below the slope equilibrium profile and is potential accommodation space where sediments transported by gravity flows could be deposited,forming lobe *** the influence of gravity flow supply,gravity flow duration,continental slope topography,equilibrium profile,and accommodation,a slump-erosional channel-lobe depositional system is developed in the Quaternary continental slope in the Baiyun *** deep-water gravity flow depositional process and the distribution of gravity flow sediments are greatly influenced by the continental slope topography,while the continental slope topography at the same time is reshaped by deep-water gravity flow depositional process and its *** study of the interplay between the continental slope and gravity flow is helpful in predicting the distribution of the deep-water gravity flow sediments and the variation of sediment quality.

关键词： seismic geomorphology deep water gravity flow sedimentary process South China Sea

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A flow chemiluminescence paper-based microfuidic device for detection of chromium(Ⅲ)in water

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Journal of Innovative Optical Health Sciences 2019年第6期12卷 56-71页

作者： Qiuping Shang Peng Zhang Huijie Li Rui Liu Chunsun Zhang MOE Key Laboratory of Laser Life Science&Institute of Laser Life Science College of Biophotonics South China Normal University Guangzhou 510631P.R.China

In this work,a solely gravity and capillary force-driven flow chemiluminescence(GCF-CL)paper-based microfuidic device has been proved for the first time as a new platforn for inex-pensive,usable,mini mally instrumented dynamic chemiluninescence(CL)detection of chromium(Ⅲ)[Cr(Ⅲ)],where an appropriate angle of inclination between the loading and detection zones on the paper produces a rapid flow of CL prompt solution through the paper *** this study,we use a cost-effective paper device that is manufactured by a simple wax screen-printing method,while the signal generated from the Cr(Ⅲ)-catalyzed oxidation of luminol by H_(2)O_(2) is recorded by a low-cost and luggable CCD camera.A series of GCF-CL affecting factors have been evaluated *** optimal conditions,two linear relationships between GCF-CL intensities and the logarithms of Cr(Ⅲ)concentrations are obtained in the concentration mnges of 0.025-35 mg/L and 50-500 mg/L separately,with the detection limit of 0.0245mg/L for a les than 30s assay,and relative standard deviations(RSDs)of 38%,4.5%and 2.3%for 0.75,5 and 50 mg/L of Cr(Ⅲ)(n=8).The above results indicate that the GCF-CL paper-based microfluidic device possesses a receivable sensitivity,dynamic range,storage stability and ***,the developed GCF-CL is utilized for Cr(Ⅲ)detection in real water samples.

关键词： Paper-based microfuidics gravity flow cherniluminescence capillary flow wax screen-printing detection of chromium(Ⅲ)

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Mass transport deposits and processes in the north slope of the Xisha Trough,northern South China Sea

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Acta Oceanologica Sinica 2015年第9期34卷 117-125页

作者： QIN Zhiliang WU Shiguo WANG Dawei LI Wei GONG Shaojun MI Lijun SPENCE George Tianjin Research Institute for Water Transport Engineering Ministry of Transport Laboratory of Marine Geophysics and Deep Sea Georesource Sanya Institute of Deep-sea Science and EngineeringChinese Academy of Sciences Tianjin Exploration Center of Marine Geology Department of Exploration China National Offshore Oil Corporation School Earth & Ocean Sciences University of Victoria

Triple mass-transport deposits （MTDs） with areas of 625, 494 and 902 km^2, respectively, have been identified on the north slope of the Xisha Trough, northern South China Sea margin. Based on high-resolution seismic reflection data and multi-beam bathymetric data, the Quaternary MTDs are characterized by typical geometric shapes and internal structures. Results of slope analysis showed that they are developed in a steep slope ranging from 5° to 35°. The head wall scarps of the MTDs arrived to 50 km in length （from headwall to termination）. Their inner structures include well developed basal shear surface, growth faults, stepping lateral scarps, erosion grooves, and frontal thrust deformation. From seismic images, the central deepwater channel system of the Xisha Trough has been filled by interbedded channel-levee deposits and thick MTDs. Therefore, we inferred that the MTDs in the deepwater channel system could be dominated by far-travelled slope failure deposits even though there are local collapses of the trough walls. And then, we drew the two-dimensional process model and three- dimensional structure model diagram af the MTDs. Combined with the regional geological setting and previous studies, we discussed the trigger mechanisms of the triple MTDs.

关键词： South China Sea mass transport deposits submarine slides gravity flow deepwater channel system

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Origin of submarine canyon-channel systems along the middle segment of West Mariana Ridge,Philippine Sea

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Journal of Oceanology and Limnology 2023年第3期41卷 881-896页

作者： Guangxu ZHANG Shuang LI Wei LI Xiujuan WANG Duanxin CHEN Dongdong DONG Wenlong WANG Key Laboratory of Marine Geology and Environment&Center for Ocean Mega-Science Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources National Laboratory for Marine Science and TechnologyQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine Geosciences and Prospecting TechniquesMOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China

Submarine canyon-channel systems have been documented in the Parece Vela Basin,West Mariana Ridge;however,the mechanism of the formation and controlling factors remain poorly *** on high-resolution multibeam bathymetric data and two-dimensional(2D)seismic profiles,we identified and mapped the submarine canyon-channel system along the middle segment of West Mariana Ridge in the Philippine *** submarine canyon-channels show a main W-E orientation at depth of 2000–4500 *** are approximately 72–128 km in length and 1.3–15 km in width,and their canyon heads are adjacent to the seamounts with several *** upper reaches of submarine canyon-channels are characterized by deeply incised,narrow,V-shaped thalwegs,suggesting the powerful erosion of gravity *** distinguished sediment waves are suggested to be resulted from the interaction of turbidity currents and *** observations demonstrate that gravity flows originated from the collapses of seamount flanks plays a vital role in developing the submarine canyonchannel system along the West Mariana *** work provides better understanding of erosion,transport,and deposition of sediments from subducting ridges to deep-water basins,and also new insights into the origin and evolution of submarine canyon-channel systems along subducting ridges.

关键词： submarine canyon-channel system gravity flow subducting ridges West Mariana Ridge

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Episodic Carbonate Deposits on the Triassic Continental Slope in Southern China

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Acta Geologica Sinica(English Edition) 1999年第1期73卷 93-103,129页

作者： Bao Zhidong Department of Geosciences,University of Petroleum,Changping District, Beijing,102200 Department of Geosciences University of Petroleum Changping District Beijing 102200

Abstract Episodic carbonate deposits on the Triassic continental slope in southern China are mainly composed of gravity-flow limestones and contourite limestones. gravity-flow limestones were well developed in the lower and middle Yangtze area in the Early Triassic and in the Yunnan-Guizhou-Guangxi area in the Early and Middle Triassic. Five fundamental types of gravity-flow limestones are recognized: slide limestone, debris-flow limestone, grain-flow limestone, turbidite limestone and rockfall limestone. They form six types of assemblage beds: slide-debris-flow limestones, slide-debris-flow-turbidite limestone, slide-debris-flow-grain-flow-turbidite limestone, rockfall-debris-flow limestone, debris-flow-turbidite limestone, and debris-flow-grain-flow-turbidite limestone. The first two were formed mainly in the Early Triassic slopes. The Middle Triassic slopes were characterized by widespread rockfall limestone. Growth faults, storms, earthquakes and oversteepened slopes are considered to be the probable triggers of the gravity flows.

关键词： continental slope episodic deposition gravity flow contour current Triassic southern China

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Origin of Taiwan Canyon and its effects on deepwater sediment

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Science China Earth Sciences 2014年第9期57卷 2769-2780页

作者： XU Shang WANG YingMin PENG XueChao ZOU HuaYao QIU Yan GONG ChengLin ZHUO HaiTeng College of Geosciences China University of Petroleum State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Guangzhou Marine Geological Survey Bureau

The continental slope of the Taiwan Shoal, which has cultivated numerous submarine canyons, is located in a passive conti- nental margin environment. However, the trend of the Taiwan Canyon, with its 45° intersection angle, is obviously different from that of the erosion valley downward along the continental slope. A distinct break is present in the lower segment of the Taiwan Canyon, which then extends from west to east parallel to the continental slope until finally joining the Manila Trench. By utilizing multiple-beam water depth data, high-resolution seismic data, and sediment cores, this study describes the topo- graphic characteristics of the Taiwan Canyon and provides a preliminary discussion on the origin of the Taiwan Canyon and its effect on deepwater sediment. The terrain, landform, and sediment of the Taiwan Canyon exhibit segmentation characteristics. The upper segment is characterized primarily by erosion, downward cutting with a V shape, and wide development of sliding, slumping, and other gravity flow types. The middle segment is characterized mostly by U-shaped erosion-sedimentation transi- tion and development of an inner levee. The lower segment is characterized primarily by sedimentation and development of a sediment wave. The bottom current has a significant reworking effect on the interior sediments of the canyon and forms re- worked sands. The formation and evolution of the Taiwan Canyon is closely related to sediment supply, gravity sliding （slumping）, faulting activities, and submarine impaling. Given the sufficient terrigenous clastic supply, the sediments along the continental shelf edge continuously proceed seaward; gliding and slumping in the front edge provide driving forces for the formation of the canyon. Faulting activities result in stratum crushing, and the gravity flow takes priority in eroding the relatively fragile stratum. Thus, the direction of the extension of the canyon crosses the surrounding erosion valley obliquely. Seamo

关键词： deepwater sediment gravity flow sediment waves Taiwan Canyon morphology

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