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Geophysical survey on the tectonic and sediment distribution of Qinghai Lake basin

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Science China Earth Sciences 2006年第8期49卷 851-861页

作者： AN Zhisheng1, WANG Ping2..SHEN Ji3. ZHANG Yixiang2..ZHANG Peizhen4, WANG Sumin3. LI Xiaoqiang1, {2. Qianli1, SONG Yougui1, AI Li1, ZHANG Yechun2..JIANG Shaoren2..liu Xingqi3.& WANG Yong3.. Institute of Earth Environment, Chinese Academy of Sciences (CAS), Xi’an 710075, China 2..{2..China sea Institute of oceanology, CAS, guangzhou {3., China 3. Nanjing Institute of Geography and Limnology, CAS, Nanjing 2..008, China 4. Institute of Geology, China Earthquake Administration, Beijing 10002.. China 1. Institute of Earth Environment Chinese Academy of Sciences (CAS) Xi’an 710075 China 2..south China {2. Institute of {3. CAS Guangzhou 510301 China 3. Nanjing Institute of Geography and Limnology CAS Nanjing 210008 China 4. Institute of Geology China Earthquake Administration Beijing 100029 China

The intensive geophysical survey of Qinghai Lake reveals the buried depth of lake sediments and their distribution features. The result indicates that there are three important inter- phases of Qinghai Lake sediments: T1 is the rife interphase of the lake, above which sediments are spread all over the lake basin with roughly the same thickness; T5 is the interphase from which the neotectonic sedimentary cycle begins, and its above sedimentary environment is relatively stable; Tg is the base of the lake basin. Five west-northwest (WNW) fault belts defined the tectonic structure of Qinghai Lake basin: the central hunch around Haixin Shan with two subbasins both in its north and south. The thickness of the lake sediments varies at different places, the thickest sediments are found within the two subbasins. According to the depth that the Sparker System can reach, sediment in the northern subbasin is deeper than 560 m, while sediment in the southern subbasin is deeper than 700 m. The correlation between the seismic sequence stratigraph and the lithology of onshore core shows that Qinghai Lake sediments consist of muddy silt, clay silt, silty clay, gravel silty clay, etc.

关键词： sediment, geophysical survey, Qinghai Lake.

Research on the dynamics of the south China sea opening:Evidence from analogue modeling

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Science China Earth Sciences 2006年第10期49卷 1053-1069页

作者： sun Zhen1,2..ZHOU Di1, ZHONG Zhihong3. XIA Bin2..QIU Xuelin1, ZENG Zuoxun4 & JIANG Jianqun5 1. CAS Key Laboratory of Marginal {3. Geology, {2..China {3. Institute of oceanology, Chinese Academy of Sciences, guangzhou {3., China 2..CAS Key Laboratory of Marginal {3. Geology, guangzhou Institute of Geochemistry, Chinese Academy of Sciences, guangzhou 510640, China 3. Department of Technology, Shenzhen Branch of CNOOC, guangzhou 5102.., China 4. Faculty of Earth Sciences, China University of Geosciences, Wuhan 43.074, China 5. Hainan Oil & Gas Exploration Company, Liaohe Oilfield PetroChina, Panjin 12..10, China 1. CAS Key Laboratory of Marginal sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China 2..CAS Key Laboratory of Marginal sea Geology Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China 3. Department of Technology Shenzhen Branch of CNOOC Guangzhou 510240 China 4. Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China 5. Hainan Oil & Gas Exploration Company Liaohe Oilfield PetroChina Panjin 124010 China

Independent of Indochina extrusion, the south China sea experienced a process from passive continental rifting to marginal sea drifting. According to the fault patterns in the Beibu Gulf basin and the Pearl River Mouth basin, the continental rifting and early spreading stage from 3.3.o {3.Ma were controlled by extensional stress field, which shifted clockwise from southeastward to south southeastward. From {3.Ma on, the sea spread in NW-SE direction and ceased spreading at around 15.5 Ma. Integrated geological information with the assumption that the south China sea developed along a pre-Cenozoic weakness zone, we did analogue experiments on the south China sea evolu- tion. Experiments revealed that the pre-existing weakness zone goes roughly along the uplift zone between the present Zhu-1 and Zhu-{3.epression. The pre-existing weakness zone is composed of three segments trending NNE, roughly EW and NEE, respectively. The early opening of the south China sea is accompanied with roughly 15° clockwise rotation, while the SE sub-sea basin opened with SE extension. Tinjar fault was the western boundary of the Nansha block (Dangerous Ground), while Lupar fault was the eastern boundary of the Indochina, NW-trending rift belt known as Zengmu basin developed between above two faults due to block divergent of Indochina from Nansha. In the experiment, transtensional flower structures along NW-trending faults are seen, and slight inversion occurs along some NE-dipping faults. The existence of rigid massifs changed the orientations of some faults and rift belt, and also led to deformation concentrate around the massifs. The rifting and drifting of the south China sea might be caused by slab pull from the proto south China sea subducting toward Borneo and/or mantle flow caused by India-Asia collision.

关键词： south China sea, rifting and drifting, clockwise rotation, analogue modeling, rigid massifs.

Phylogenetic diversity of bacteria associated with the marine sponge Agelas robusta from south China sea

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Acta Oceanologica Sinica 2010年第5期29卷 65-73页

作者： sun We DAI Shikun WANG Guanghua XIE Lianwu JIANG Shumei LI Xiang Key Laboratory of Marine Bio-resources Sustainable Utilization （LMB-CAS） Guangdong Key Laboratory of Marine Materia Mediea （LMMM-GD） South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China Central south University of Forestry and Technology Changsha 410004 China

It is well known that marine sponges harbor large numbers of bacteria,some of which have been proved to be *** diversity of bacteria in marine sponges distributed along the coast of south China sea has been previously studied but that of bacteria in sponges inhabiting the open sea has been rarely *** this report,the diversity of bacteria associated with the marine sponge Agelas robusta from a remote coral reef in the south China sea was documented employing 16S rDNA library construction,amplified ribosomal DNA restriction analysis（ARDRA） and phylogenetic analysis.A total of 3.5}hylotypes were finally categorized in nine phyla including Cyanobacteria,Proteobacteria,Chloroflexi,Firmicutes,Actinobacteria,Acidobacteria,Planctomycetes,Bacteroidetes and *** dominant phylum was Proteobacteria whereas the dominant genus was Synechococcus in *** spongespecific bacteria were also found in the bacteria population,but the proportion（5 OTUs/3.5}TUs） was much lower than other *** study reveals the phylogenetic diversity of bacteria in *** and confirms the presence of some sponge-specific bacteria in the south China *** the diversity of sponge-associated bacteria in China assists to exploit the bacteria resources for biotechnology.

关键词： south China sea Agelas robusta phylogenetic diversity sponge-specific bacteria

Comparative analysis of astaxanthin and its esters in the mutant E1 of Haematococcus pluvialis and other green algae by HPLC with a C3. column

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Science China(Life Sciences) 2008年第12期51卷 1108-1115页

作者： PENG Juan1, XIANG WenZhou2.., tanG Quan{2.1, {2..Ni1, CHEN Feng1,3.& yuAN JianPing 4 1 south China sea Institute of oceanology, Chinese Academy of Sciences, {3. 5103.1, China 2..nstitute of oceanology, Chinese Academy of Sciences, Qingdao 2..071, China 3.School of Biological Sciences, The University of Hong Kong, Hong Kong, China 4 Institute of oceanology & College of Life Sciences, {2..Yat-Sen University, {3. 5103.1, China south China sea Institute of {2. Chinese Academy of Sciences Guangzhou 510301 China Institute of oceanology Chinese Academy of Sciences Qingdao 266071 China School of Biological Sciences The University of Hong Kong Hong Kong China Institute of oceanology & College of Life Sciences Sun Yat-Sen University Guangzhou 510301 China

A gradient reversed-phase high-performance liquid chromatography (HPLC) method using a C3. col-umn was developed for the simultaneous determination of astaxanthin, astaxanthin monoesters and astaxanthin diesters in the green algae Chlorococcum sp., Chlorella zofingiensis, Haematococcus plu-vialis and the mutant E1, which was obtained from the mutagenesis of H. pluvialis by exposure to UV-irradiation and ethyl methanesulphonate (EMS) with subsequent screening using nicotine. The re-sults showed that the contents of total astaxanthins including free astaxanthin and astaxanthin esters ranged from 1.4 to 3..9 mg/g dry biomass in these green algae. The lower total astaxanthin levels (2.g/g dry biomass) were detected in the green algae Chlorococcum sp. and C. zofingiensis. The higher total astaxanthin levels (>16 mg/g dry biomass) were found in the green alga H. pluvialis and its mutant E1. It is notable that the mutant E1 is found to have considerably higher amounts of total astaxanthin (3..9 mg/g) as compared to the wild strain of H. pluvialis (16.1 mg/g). This indicates that UV-irradiation and EMS compound mutagenesis with subsequent screening using nicotine is an effective method for breeding of a high-producing astaxanthin strain of H. pluvialis. In addition, the green alga C. zofingien-sis had a remarkably higher percentage of astaxanthin diesters (76.3. of total astaxanthins) and a re-markably lower percentage of astaxanthin monoesters (18.0% of total astaxanthins) in comparison with H. pluvialis (3..5% for diesters and 60.9% for monoesters), the mutant E1 (49.1% and 48.1%) and Chlorococcum sp. (18.0% and 58.6%).

关键词： green algae Haematococcus pluvialis mutant astaxanthin HPLC C3. column

Mesozoic subduction-accretion zone in northeastern south China sea inferred from geophysical interpretations

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Science China Earth Sciences 2006年第5期49卷 471-482页

作者： ZHOU Di1, WANG Wanyin2..WANG Jialin3. PANG Xiong4, CAI Dongsheng5 & sun Zhen1 1. Key Laboratory of Marginal {2. Geology, {2..China {2. Institute of oceanology, Chinese Academy of Sciences, Guang- zhou 5103.1, China 2..College of Geological and Topographical Engineering, Chang’an University, Xi’an 710054, China 3. Key Laboratory of Marine Geology, Tongji University, Shanghai 2..092..China 4. China National Offshore Oil Co. Limited – Shenzhen Branch, Shenzhen 518067, China 5. China National Offshore Oil Co. Limited – Re{2.rch Center, Beijing 10002.. China 1. Key Laboratory of Marginal sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China 2..College of Geological and Topographical Engineering Chang’an University Xi’an 710054 China 3. Key Laboratory of Marine Geology Tongji University Shanghai 200092 China 4. China National Offshore Oil Co. Limited — Shenzhen Branch Shenzhen 518067 China 5. China National Offshore Oil Co. Limited — Research Center Beijing 100027 China

A segment of Mesozoic subduction-accretion zone was inferred across thenortheastern south China sea at approximately NE450 orientation. Basic evidence includes thefollowing: A belt of peek gross horizontal Bouguer gravity gradient (PGHGBA) is comparable in sizeand intensity to that of the Manila subduction-accretion zone. A belt of high positive magneticanomalies appears to the north and sub-parallel to the PGHGBA, representing the volcanic arcassociated to the subduction zone. The PGHGBA crosses obliquely both Cenozoic structures and presentseafloor topography, indicating a pre-Cenozoic age. The segment is offset left-laterally byNW-running strike-slip faults, in concord with the Mesozoic stress field of south China. Inaddition, the existence of the subduction zone is supported by wide-angle seismic data obtained indifferent years by different institutions. At approximate localities, a north-dipping ramp of Mohosurface is indicated by records of ocean-bottom seismometers, and a strong reflector about 8 kmbeneath the Moho reflector is indicated by both OBS and long-cable seismic records. Theidentification of a segment of Mesozoic subduction zone in NE south China sea fills nicely the gapof the Great Late Mesozoic Circum SE Asia Subduction-acrretion Zone, which extended from Sumatra,Java, SE Kalimantan to N Palawan, and from Taiwan, Ryukyu to SW Japan.

关键词： Mesozoic, subduction zone, SE Asia, NE south China sea, geophysics.

The bacterial diversity in surface sediment from the south China sea

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Acta Oceanologica Sinica 2010年第4期29卷 98-105页

作者： WANG Guanghua DONG Junde LI Xiang sun Huimin Key Laboratory of Marine Bio-resources Sustainable Utilization South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China Graduate University of Chinese Academy of Science Beijing 100049 China

16S rDNA sequencing results from this study and literatures demonstrate that sediment bacteria in the south China sea （SCS） were very diverse,which contained {2.of the {2.phyla of bacteria investigated from marine sediment,however,it was very imbalance among *** bacterial diversity from 15 samples which covered a wide range of sediment types from {2.to 3.888 m in depth was studied in DGGE （denature gradient gel electrophoresis） in this *** DGGE results indicate that both sediment bacterial diversity and diversity difference among stations were *** representative and differential fingerprints among samples were recovered and sequenced,phylogenetic analysis indicates that they may belong to Proteobacteria （α-,β-,γ-,δ-,ε-）,Planctomycetes,Firmicutes,Chloroflexi,Acidobacteria,Actinobacteria,Nitrospirae,Gemmatimonadetes,candidate division WS3.and so on,of which,Gemmatimonadetes and candidate division WS3.bacteria were first detected in SCS *** study also shows that bacterial diversity analysis based on DGGE was more potential than traditional 16S rDNA clone library in multiple sample analysis.

关键词： bacterial diversity DGGE marine sediment south China sea

High-frequency atmospheric variability over south China sea as depicted by TRMM and QuikSCAT

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Acta Oceanologica Sinica 2011年第2期30卷 46-52页

作者： LI Weibiao WANG Dong xiao LEI Ting liu Zijie LU0 Cong DepartmentofAtmosphericSciences SunYat—SenUniversityGuangzhou510275China LED SouthChinaSeaInstituteofOceanologyChineseAcademyofSciencesGuangzhou510301China

By using the TRMM and QuikSCAT datathe characteristics of the 2.. day high frequency atmospheric variability over the south China {2. are studied in this ***’s found that：（1） the 2.. day high frequency signals are significant not only during the periods of the south China {2. Summer Monsoon （SCSSM）,but also after the retreat of the *** reaches its peak around July to August;（2..the 2.. day high frequency signals exhibit strong intermittent features;（3. During El Nino years,the 2.. day high frequency signals are active only in the periods of the *** La Nina years,the 2.. day high frequency signals are obviously not only in periods of the SCSSM,but also after the retreat of the *** the SCSSM periods,the 2.. day high frequency signals in El Nino years are much stronger than that in La Nina years;（4） During spring to early summer,most of 2.. day signals propagate southward and eastward,during midsummer to autumn,however,most of 2..-day signals propagate northward and westward;（5） The 2.. day northward and westward propagation signals is probably related to the activities of high-frequency vortex over the SCS.

关键词： high-frequency atmospheric variability south China sea TRMM QuikSCAT

Magmatic-tectonic response of the south China Craton to the Paleo-Pacific subduction during the Triassic:a new viewpoint based on Well NK-1

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Journal of oceanology and Limnology 2024年第1期42卷 58-89页

作者： Chan WANG Hao liu Gang LI Zhen sun Tingting GONG Li MIAO Xiaowei ZHU yunying ZHANG Weihai XU Wen YAN Key Laboratory of Ocean and Marginal sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China southern Marine Science and Engineering Guangdong Laboratory(guangzhou) Guangzhou 511458China Key Laboratory of Tectonic Controlled Mineralization and Oil Reservoir of Ministry of Natural Resources Chengdu University of TechnologyChengdu 610059China School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China College of Earth Science Chengdu University of TechnologyChengdu 610059China University of Chinese Academy of Sciences Beijing 100049China

The Nansha Block(NB)is one of the blocks separated from the southern margin of the south China Craton(SCC)by the western Pacific subduction,which contains rich information of geodynamic and tectonic *** reveal the essence of western Paleo-Pacific subduction during the Triassic period,Well NK-1 in this block was selected for petrographic study,and published re{{2.ch data from other cooperative teams were compared.A double-cycle pattern of basic to neutral magmatic volcanism was established,and 3. lithological rhythmic layers and representative cryptoexplosive breccia facies and welded tuff bands were *** with a reanalysis of published geochronological data,geochemical elements,and isotope geochemistry,we found that the rock assemblages could be divided into an intermediate-acid dacite(DA)series(SiO_({2.65%)and basaltic(BA)series(Co2..6±3.{2.({2..9±3.5)Ma).BA exhibits obvious calc-alkaline island-arc magmatic properties:(^(87)Sr/^(86)Sr)_i ratio ranging 0.703.7–0.71118(average:0.70645),^(147)Sm/^(144)Nd ratio ranging 0.119–0.193.average:0.168),and chondrite-normalized rare earth element(REE)curves being flat,while DA exhibits remarkable characteristics of subducted island-arc andesitic magma:(^(87)Sr/^(86)Sr)_i ratio(0.7093.–0.711{2.average:0.7103.),εNd(t)value(-6.{2.4.8;average:-5.6)andε_(Hf)(t)value(-{2.–-1.7,average:-{2.)show obvious crust-mantle mixing *** and DA reveal typical characteristics of island-arc magma systems and typeⅡenriched mantle(EM-Ⅱ)*** magma was likely resulted from the process whereby the continental crust frontal accretionary wedge was driven by the Paleo-Pacific slab subduction into the deep and began to melt,resulting in a large amount of melt(fluid)joined the asthenosphere on the side of the continental *** contrast,DA magma was likely resulted from the process whereby the plate front was forced to bend with increasing subducti

关键词： Paleo-Pacific tectonic domain tectonic evolution rift volcanic rock Nansha Block south China Craton

The bacteria diversity in surface sediments from south China sea

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The bacteria diversity in surface sediments from South China...