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The fluxes and controlling factors of N_2. and CH_4.emissions from freshwater marsh in Northeast China

Science China Earth sciences 2010年第5期53卷 700-709页

作者： YU JunBao1,2. LIU JingShuang2. SUN ZhiGao1, SUN WeiDong3, WANG JinDa2. WANG GuoPing2.& CHEN XiaoBing1 1 Key Lab of Coastal Envionment Processed, Yantai institute of Coastal Zone Research for Sustainable Development, chinese academy of sciences, Yantai 2.{2.03, China 2.Key Lab of Wetland Ecology and Environment, Northeast institute of Geography and Agricultural Ecology, chinese academy of sciences, Changchun 130012. China 3 Key Laboratory of Isotope Geochronology and Geochemistry, {{2. institute of Geochemistry, chinese academy of sciences, guangzhou 510640, China Key Lab of Coastal Envionment Processed Yantai Institute of Coastal Zone Research for Sustainable Development Chinese Academy of Sciences Yantai China Key Lab of Wetland Ecology and Environment Northeast Institute of Geography and Agricultural Ecology Chinese Academy of Sciences Changchun China Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China

Nitrous oxide (N2.) and methane (CH4. emissions were measured using a static chamber method in two adjacent plots of freshwater marsh predominated by Calamagrostis angustifolia, one is seasonal waterlogged (SW) and the other without surface water accumulation (NW), in Sanjiang Plain wetland (4.°35′N, 133°31′E), northeast China, during 2.02.2.04. The diurnal and seasonal flux variations of both gases were significantly correlated with 5-cm-soil temperature. The NW marsh is a source of N2. and sink of CH4. while the SW marsh is sink of N2. and source of CH4. Remarkably, we observed a N2. emission peak under Eh of +300 to +100 mV, and CH4.emission peak under Eh of +300 to +4.0 mV, which indicate additional sources of N2. and CH4.for the freeze-thaw induced emission peaks of N2. and CH4.observed between late July and early August. Further study shows that the additional N2. and CH4.were emitted under the frozen soil after thawing.

关键词： freeze-thaw region freshwater marsh methane nitrous oxide controlling factors

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Neutron capture effects and pre-atmospheric sizes of meteoroids

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chinese Science Bulletin 2003年第20期48卷 2236-2240页

作者： WANG Daode & LIN Yangting guangzhou institute of Geochemistry,{2., guangzhou 510640, China Correspondence should be addressed to Wang Daode (e-mail: gzwangdd @***) guangzhou institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

Excesses of 80Kr and 82.r, produced by secondary neutron capture effects of 79Br and 81Br, were observed in meteorites. Epithermal neutron flux, Jn (30—300 eV), and fast neutron flux, Jn( > 5 MeV), were determined according to reactions of 79Br(n, gb)80Kr, 81Br(n, gb)82.r, and 2.0}g(n, a)2.Ne, respectively. Cosmogenic noble gases of several ordinary chondrites fell in China indicate a positive relationship between Jn (30—300 eV)/Jn ( > 5 MeV) ratio and Jn (30—300 eV). This suggests large pre-atmospheric sizes of the meteorites, and a considerable fraction of the secondary neutrons were slowed down to epithermal energy. According to its relationship with Jn (30—300 eV)/Jn ( > 5 MeV) ratio, the pre-atmospheric minimum radii and masses of several chinese chondrites were estimated as below: Zhaodong: 60 cm, 32.0 kg; Laochengzhen: 2. cm, 4.0 kg; Suizhou: 31 cm, 4.0 kg; Xi Ujimgin: 2. cm, 160 kg; Dongtai: 2. cm, 14. kg.

关键词：流星体陨星中子俘获大气层前尺寸宇宙成因核素

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Features of inclusions in the Funiushan gold deposits of Central China and its implications for prospecting

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chinese Science Bulletin 1999年第S2期44卷 15-16页

作者： ZHANG Zhengwei~1, ZHU Bingquan~1 and DENG Jun~2.1. guangzhou institute of Geochemistry,{2., guangzhou 510640, China 2. China University of Geoscience, Beijing 100083, China guangzhou institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China China University of Geoscience Beijing 100083 China

GOLD mineralization popularly occurs in Funiushan area. Based on the studies on more than 4. gold deposits or ore spots, it is shown that most of them are small in scale except the Pengou gold deposit, whichcan be developed into a medium one. The Pengou is a gold deposit of medium-low temperature hydrothermal type. 1 Geological setting The Funiushan gold mineralization zone lying in the contiguous region of Nanzhao, Fangcheng andLushan Counties, Henan Province, is stituated on the tectonic and geochemical boundary between theNorth China block and Qinling Orogenic belt, and transverses the two first-grade tectonic units. Thehost rocks are mainly the strata of Xionger group （Pt2./sub> ） and the Funiushan granitic batholith. The Penggougold deposit is just located on the large-scale fault of Xiatang-Guihe. A series of metamorphic rocks ofXionger Group outcroped in the north of the deposit. 2.The features of deposit The ore bodies mostly appear in thick plate with sag-and-swell variation. The gold-bearing alterationzone from upper to lower layers can be divided as granite→ pyritization and phyllic alteration→ alteredgranitic porphyry→quartz vein→pyritization and phyllic alteration→cataclastic granite with phyllic alteration, i. e. the upper and lower gold-bearing layers can be separated by the altered granite. The ore

关键词： gold deposit inclusion geochemistry Funiushan.

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Experimental Study of Partial Melting of Mantle Peridotite -A Discussion about the Genesis of Sih'ca-rich Fluids (Melts)

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Acta Geologica Sinica(English Edition) 1999年第4期73卷 395-403页

作者： LI Jianping guangzhou institute of Geochemistry,{2., guangzhou, {4., Chinaand Kornprobst JACQUES Departement des sciences de la Terre, Universite Blaise Pascal, 610038 Clermont-Ferrand, France chinese Acad Sci Guangzhou Inst Geochem Guangzhou 510640 Peoples R China Univ Blaise Pascal Dept Sci Terre F-610038 Clermont Ferrand France

Experiments on partial melting of mantle lherzolite have been realized at 0.6 and 1.0 GPa and the chemical compositional variations of melts during different melting stages have been first discussed. The results show that the trends of variations in SiO2. CaO, Al2.3, Na2. and TiO2.are different at different melting stages. The melts produced at lower pressure are richer in SiO2.than those at higher pressure. The mantle-derived silica-rich fluids (silicate melts) are polygenetic, but the basic and intermediate-acid silicate melts in mantle peridotite xenoliths from the same host rocks, which have equivalent contents of volatile and alkali components and different contents of other components, should result from in-situ (low-degree) partial melting of mantle peridotite under different conditions (e.g. at different depths, with introduction of C-O-H fluids or in the presence of metasomatic minerals). The intermediate-acid melts may be the result of partial melting (at lower pressure) Opx + Sp + K-Na-rich fluid ±(Am-phi) ± (Phlog) = OI + melt. But the intermediate-acid magmas cannot be produced from the partial melting of normal mantle peridotite unless the crustal materials are introduced to some extent.

关键词： mantle peridotite in-situ partial melting compositional variation of melt genesis of silica-rich fluid (stlicate melt)

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Low-temperature mineralization domain associated with the parallel positions between geochemical steep zones and geophysical gradient zones

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chinese Science Bulletin 1999年第S2期44卷 166-168页

作者： ZHU Bingquan, DONG Yunpeng, CHANG Xiangyang and ZHANG Zhengwei guangzhou institute of Geochemistry,{2., guangzhou 510640, China guangzhou institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

THE parallel strike of geochemical steep zones and geophysical gradient zones represent geochemicalboundaries with tectonic hiding and almost no magmatism, but there existed great variation of lithosphereor crustal thickness. Tectonically, these areas were located in the foreland basins of craton margin. Thesegeochemical boundaries were usually associated with the low-temperature mineralization and petroleumgeneration. The Nd, Sr and Pb isotopic evidence indicated that there still existed strong crustal-mantle interaction through fluid activation along deep-seated faults at the craton margin. Fig. 1 is the 2.7Pb/2.4./sup> Pb-2.8Pb/2.4./sup> Pb diagram, which shows the evident crust-mantle mixing for crude oil, chloroform bitumen-A,

关键词： low temperature mineralization domain geochemical steep zones geophysical gradient zones.

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The role of reservoir mediums in natural oil cracking:Preliminary experimental results in a confined system

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chinese Science Bulletin 2010年第33期55卷 3787-3793页

作者： XIAO QiLin1,2.SUN YongGe1,3 & ZHANG YongDong1,2.1 State Key Laboratory of Organic Geochemistry,guangzhou institute of Geochemistry,{2. academy of {4.,guangzhou 510640,China 2.Graduate Schools,{2. academy of {4.,Beijing 10004.,China 3 institute of Environmental and Biogeochemistry(eBig),Zhejiang University,Hangzhou 31002.,China State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Graduate Schools Chinese Academy of Sciences Beijing China institute of Environmental and Biogeochemistry (eBig) Zhejiang University Hangzhou China

Large amounts of data regarding the influence of temperature and pressure on the thermal stability of crude oil have been pub-lished;however,the role of reservoir mediums has received little *** involving oil cracking in the presence of montmorillonite,illite,calcite,quartz and water were conducted in closed gold tubes to investigate the effects of these reservoir mediums on oil *** was done by screening variations in the chemical and stable carbon isotopic components of nC10+ and gasoline-range hydrocarbons(nC8-)present in various *** indicated that reservoir mediums have an active role in oil cracking under experimental *** concentrations of nC10+ in the cracked residues progressively decreased in systems containing oil+water+illite,oil+water+montmorillonite,oil+water,oil+water+quartz and oil+water+*** comparison with the system containing oil+water,our results indicated a retardation effect for oil cracking in systems in the presence of illite and montmorillonite,and an acceleration effect on oil destruction in systems in the presence of calcite and ***10+ became increasingly depleted in 13C in systems with oil+water+illite,oil+water+calcite,oil+water+montmorillonite,oil+water+ quartz and oil+*** obvious correlation was observed between concentrations and stable carbon isotopic components of nC6-nC8 and nC10+ in the individual *** discrepancies in chemical and stable carbon isotopic components of nC6-nC8 and nC10+ in the pyrolyzed residues highlighted the important role of reservoir mediums to control carbon-carbon cleavage of nC10+ and then the isomerization,cyclolization and aromatization reactions;as well as governing the occurrence and thermal destruction of nC6-nC8 under experimental *** research may have critical implications in reconstructing chemical kinetic models for natural oil cracking.

关键词：裂解作用实验条件密闭系统原油裂解水库介质天然同位素组成

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Gas formation mechanism of marine carbonate source rocks in China

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Science China Earth sciences 2005年第4期48卷 441-453页

作者： ZHAO Wenzhi1, WANG Zhaoyun1, HE Haiqing2. ZHANG Mingjie3, WANG Hongjun1, WANG Yunpeng4.& QIN Yong5 1. Research institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China 2. PetroChina Exploration & Production, Beijing 100011, China 3. Department of Geology, Lanzhou University, Lanzhou 730000, China {2., chinese academy of sciences, guangzhou 510640, China 5. China University of Mining and Technology, Xuzhou 2.1000, China Research institute of Petroleum Exploration & Development PetroChinaBeijin China PetroChina Exploration & Production Beijing China Department of Geology Lanzhou University Lanzhou China guangzhou geochemical{2. Chinese Academy of Sciences Guangzhou China China University of Mining and Technology Xuzhou China

By breaking through the conventional ideology on the study of gas-formation mechanism of source rocks which focused on merely the characteristics of source rocks them- selves, and based on the development and distribution characteristics of marine carbonate source rocks in the medium-to-bottom parts of the chinese superimposed sedimentary basins as well as various processes in the course of gas generation and reservoir forming, the complex hydrocarbon-generating model of carbonates is established. Such a model concerns not only the “three-stage” gas formation characteristics of carbonates, but also the gas generation process due to a thermal cracking of oil and the re-generation process of gas from heated secondary organic matters during the gas-generation and reservoir-forming course. The high-quality hy- drocarbon generating matter of marine carbonate source rocks determined a high gas-oil ratio and tended to form paleo-oil-reservoirs, representing an enrichment process of organic matters. The thermal cracking of oil in palaeo-oil-reservoirs is an important means for the effective forma- tion of gas reservoirs. The secondary organic matters in carbonate reservoirs may regenerate gas after a secondary deep burial, thus becoming an effective gas source.

关键词： carbonate, three-stage hydrocarbon generation, inhibitive effect of maturity, oil-cracking gas, second-ary asphalt gas.

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Analytical method of radiation by a wave energy device with dual rectangular floating bodies

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Acta Oceanologica Sinica 2010年第3期29卷 106-115页

作者： WANG Wensheng YOU Yage ZHANG Yunqiu WU Bijun YE Yin guangzhou institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 China Key Laboratory of Renewable Energy and Gas Hydrate Chinese Academy Sciences Guangzhou 510640 China Graduate University Chinese Academy of Sciences Beijing 100049 China

The system with one floating rectangular body on the free surface and one submerged rectangular body has been applied to a wave energy conversion device in water of finite depth. The radiation problem by this device on a plane incident wave is solved by the use of an eigenfunction expansion method, and a new analytical expression for the radiation velocity potential is obtained. The wave excitation force is calculated via the known incident wave potential and the radiation potential with a theorem of Haskind employed. To verify the correctness of this method, an example is computed respectively through the bound element method and analytical method. Results show that two numerical methods. are in good agreement, which shows that the present method is applicable. In addition, the trends of hydrodynamic coefficients and wave force are analyzed under different conditions by use of the present analytical method.

关键词： wave energy device hydrodynamic coefficients wave force analytical method

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Discovery of seep carbonate nodules as new evidence for gas venting on the northern continental slope of South China Sea

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chinese Science Bulletin 2006年第10期51卷 1228-1237页

作者： CHEN Zhong1,2.3, YAN Wen1,2.3, CHEN Muhong1,3, WANG Shuhong1,2.3, LU Jun1,3, ZHANG Fan1,3, XIANG Rong1,3, XIAO Shangbin1,3, YAN Pin1,2.3 & GU Senchang1,2.3 1. South China Sea institute of Oceanology, chinese{2. of Sci-ences, guangzhou 510301, China 2. guangzhou Center for Gas Hydrate Research, chinese academy of sciences, guangzhou 510301, China 3. Key Laboratory of Marginal Sea Geology, South China Sea institute of Oceanology and guangzhou institute of Geochemistry, chinese academy of sciences, guangzhou 510301, China South China Sea institute of Oceanology Chinese Academy of Sciences Guangzhou China guangzhou Center for Gas Hydrate Research Chinese Academy of Sciences Guangzhou China Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology and Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China

Seep carbonate nodules were firstlycollected from the southwestern Dongsha area onnorthern continental slope of South China Sea formineralogical and geochemical studies. The resultsof X-ray diffraction show that carbonate nodules arecomposed of Fe-rich domolite,siderite and a few cal-cite and aragonite, as well as a small quantity ofnon-carbonate minerals such as goethite, quartz andclay minerals. Fe-rich dolomite and siderite charac-terized by euhedral microcrystalline structure weredirectly precipitated at cold seeps. The δ 13C valuesfor Fe-rich dolomite and siderite in the bulk nodulesvary from ?18.2.1} to ?36.07‰, and the δ 18O valuesrange from 0.4. to 2.76‰. Their moderate depleted13C reflects that carbon origin is possibly thermoge- netic gas or mixed gas, which is evidence of gasventings in the seafloor. Moreover, massive wormtube fossils related to cold seeps were found on thesurfaces of carbonate nodules, and the conduitsand/or channels in semi-solidified nodules whichwere not filled by carbonate or sediment were alsoobserved. A preliminary conclusion is that activemicro gas venting with a conduit/channel diameterrange from 2.0 μm to 600 μm possibly exists inmodern seafloor of the carbonate nodule area.

关键词：渗出碳酸盐节碳氧同位素甲烷渗漏天然气水化物

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Lincang Superlarge Germanium Deposit in Yunnan Province,China: Sedimentation,Diagenesis,Hydrothermal Process and Mineralization

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Journal of Earth Science 1998年第2期17卷 37-44页

作者： Zhuang Hanping Lu Jialan Fu Jiamo Liu Jinzhong guangzhou institute of Geochemistry,{2., guangzhou 510640

The mineralization is related closely to sedimentation, diagenesis and hydrothermal processes. In this paper, investigations are carried out on coal occurrence, maceral composition, inorganic minerals, trace elements and huminite reflectance. It is concluded that the source of Lincang superlarge deposit is mainly the muscovite granite in the west edge of the basin. During sedimentation, Ge (germanium) was leached out and entered the basin. Ge was adsorbed by lower organism and humic substances in water. Lincang lignite underwent three thermal processes: peatification, early diagenesis and hydrothermal transformation. During peatification, Ge was adsorbed or complexed by humic colloids. During early diagenesis, the Ge associated with humic acids was hard to mobilize or transport. Most of Ge entered the structure of huminite while a small amount of Ge was associated with residual humic acids as complex or humate. During hydrothermal transformation, the heated natural water or deep fluid from basement encountered the coal layer within tectonic weak zone. SO 2. 4. was reduced by coal organic matter. Pyrite and calcite formed. Hydrothermal process did not contribute significantly to mineralization.

关键词： Lincang superlarge germanium deposit sedimentation diagenesis hydrothermal process mineralization.

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