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chinese science Bulletin 2000年第S1期45卷 26-34页

作者： WANG Yunpengguangzhou institute of Geochemistry, chinese academy of sciences,{4., china chinese Acad sci Guangzhou Inst Geochem Guangzhou 510640 Peoples R China

This paper presents the contents of 17 kinds of trace elements in plant leaf samples collected from 4.sections in the North Jiangsu oil field, and the dada on their visible-near infrared spectra. By comparing the results of the inner and outer oil-gas remote-sensing anomaly areas, the plant trace element composition, and the enrichment characteristics and their influence on the plant spectral properties are described. The results indicated that the plant leaves had very strong enrichment ability toward some elements such as Mg, Ca, K, Na, Fe, Al, Mn, V, Zn and Cr. The plant leaves from the oil-gas abnormal areas were enriched in trace elements of the Fe-series, but depleted in alkali and alkali-earth metal elements. The plant trace elements had a strong influence on the 'blue-shift' strength and the reflectance of visible bands. And the ratios between Fe, Co and K, Na, Cd, Cu, Ba are the effective remote-sensing oil-indicating factors of plant trace elements. plant trace element, geochemistry, remote

关键词： plant trace element geochemistry remote sensing spectra North Jiangsu oil fleld.

Geochemistry of high-Mg andesites from the early Cretaceous Yixian Formation, western Liaoning: Implications for lower crustal delamination and sr/Y variations

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science china Earth sciences 2006年第9期49卷 904-914页

作者： WANG Xiaorui1, GAO shan1,2, LIU Xiaoming1, YUAN Honglin1, HU Zhaochu1, ZHANG Hong1,3 & WANG Xuance4.1. state Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi`an 710069, china 2. state Key Laboratory of Geological Processes and Mineral Resources, china University of Geosciences, Wuhan 4.0074. china 3. shenyang institute of Geology and Mineral Resources, shenyang 110032, china 4. guangzhou institute of Geochemistry, chinese academy of sciences, guangzhou 51064., china 1. state Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi’an 710069 China 2. state Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan 430074 China 3. shenyang institute of Geology and Mineral Resources Shenyang 110032 China 4. guangzhou institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

85 volcanic rocks of the Yixian Formation from the sihetun type section werecollected and analyzed for geochemical and isotopic compositions. Major element compositionsindicate that the sihetun volcanic rocks are high magnesium andesites with some basalts occurring atthe bottom of section. The sihetun high magnesium andesites (siO_2 = 52.82-59.31 wt%, Al_2O_3=14.15-16.35wt%) show many characteristics of adakites such as depletion in heavy rare-earth elements(HREE; Yb = 1.03-1.88 μg/g) and Y(12-20 μg/g) and high sr (620-1323 μg/g) and sr/Y(32-88), withhigh La_N/Yb_N ratio (10-25). They share similar major and trace element characteristics to volcanicrocks from the Xinglonggou Formation except their lower Nd isotope ratios (^(14.)Nd/^(14.)Nd(130Ma) = 0.5118-0.5119, ε_(Nd) (130Ma) = -11.6-13.8, ^(87)sr/^(86)sr (130 Ma) = *** were interpreted in a way that eclogite that formed at the base of thickened Archean lowercrust of the North china craton foundered into the convecting mantle and subsequently melted andinteracted with peridotite. However, compared to the Xinglonggou volcanic rocks, the source of thesihetun magma contained more ancient continental crustal material in order to explain its evolved Ndisotopes. The age of the sihetun Formation was 120 to 130 Ma, and this indicates that delaminationlasted to the early Cretaceous period. The sr contents and sr/Y ratios of the sihetun high-Mgandesites show significant negative correlations with siO_2 for samples with siO_2 > 56%. Thesesuggest that the sr and sr/Y values were reduced due to fractional crystallization of ***, the effect of crystallization on volcanic sr and sr/Y ratio has to be taken intoaccount.

关键词： High-Mg andesite, Adakite, Yixian Formation, North china Craton, delamination.

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 academy of sci-ences, {4. 510301, china 2. {4. Center for Gas Hydrate Research, chinese academy of sciences, {4. 510301, china 3. Key Laboratory of Marginal sea Geology, south china sea institute of Oceanology and {4. institute of Geochemistry, chinese academy of sciences, {4. 510301, china south china sea institute of Oceanology Chinese Academy of Science Guangzhou China guangzhou Center for Gas Hydrate Research Chinese Academy of Sciences Guanzhou 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 ?18.24. 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 200 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

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 4. guangzhou geochemical institute, chinese academy of sciences, guangzhou 51064., china 5. china University of Mining and Technology, Xuzhou 221000, china 1. Research institute of Petroleum Exploration & Development 100083 PetroChinaBeijin China 2. Petrochina Exploration & Production 100011 Beijing China 3. Department of Geology Lanzhou University 730000 Lanzhou China 4. guangzhou geochemical institute Chinese Academy of Sciences 510640 Guangzhou China 5. china University of Mining and Technology 221000 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.

Aoyitake plagiogranite in western Tarim Block, NW china: Age, geochemistry, petrogenesis and its tectonic implications

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science china Earth sciences 2006年第11期49卷 1121-1134页

作者： ZHANG Chuanlin1,2, YU Haifeng3, YE Haimin2, ZHAO Yu2 & ZHANG Dongsheng4.1. Key Laboratory of Isotope Geochronology and Geochemistry, guangzhou institute of Geochemistry, chinese academy of sciences,{4., china 2. Nanjing institute of Geology and Mineral Resources, Nanjing 210016, china 3. Tianjin institute of Geology and Mineral Resources, Tianjin 300170, china 4. The 2nd Regional Geological Investigation Party, Xinjiang Bureau of Geology and Mineral Resources, Changji 831100, china 1. Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China 2. Nanjing institute of Geology and Mineral Resources Nanjing 210016 China 3. Tianjin institute of Geology and Mineral Resources Tianjin 300170 China 4. The 2nd Regional Geological Investigation Party Xinjiang Bureau of Geology and Mineral Resources Changji 831100 China

sHRIMPP U-Pb zircon age and geochemical and Nd isotopic data are reported for the Aoyitake plagiogranite in western Tarim Block, NW china. The plagiogranite intruded the Middle Pro- terozoic and Lower Carboniferous with an exposure area of ca. 60 km2 and crystallized at 330.7±4.8 Ma. Rock types mainly include tonalite, trondhjemite and minor amounts of diorite and quartz-diorite. Feldspars in the rocks are dominated by oligoclase-andesine, and minor perthite observed locally. The granites are sodic with Na/K ratios (molar) between 4.and 87. Total REE (50-220 ppm) show a clear positive correlation with siO2. There is no LRRE/HREE fractionation (LaN/YbN=0.5-1.5), me- dium negative Eu anomalies (δ Eu=0.3-0.6), high Y content and low sr/Y ratio (~1.0). These granites exhibit relatively juvenile Nd T2DM model ages of 4.0 to 580 Ma and positive εNd(331 Ma) values of 6.23 to 7.65. The aforementioned characteristics are similar to those of ocean island or ocean ridge plagiogranites. However, the regional geology, especially its scale, precludes that the plagiogranite pluton was derived directly from fractionational crystallization of mantle-derived basaltic magma. We interpreted that the primary magma of the pluton might be tonalitic in composition generated by ca. 50% partial melting of the juvenile basaltic crust. The primary magma experienced intensive frac- tionational crystallization, and intruded into the middle to upper crusts to form the granite pluton. In combination with the previous regional geological data, it is concluded that the plagiogranite pluton was emplaced within the Tarim Block in respond to the Carboniferous continental rifting along the Tianshan orogenic belt.

关键词： western Tarim, Aoyitake plagiogranite, age, geochemistry, tectonic implications.

Tectonic implications of the isotopic geochemical steep zone in eastern Yunnan, china

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chinese science Bulletin 1999年第S2期44卷 195-196页

作者： DONG Yunpeng, ZHU Bingquan and CHANG Xiangyang guangzhou institute of Geochemistry, chinese academy of sciences,{4., china guangzhou institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

THE studies on geology, geochemistry and geophysics of mantle and crust show that there exist distinctvertical and lateral heterogenetics of the composition and structures of lithosphere. Especially, continentallithosphere possesses a complex rheological structure, which is one of the important factors controlling thedeformation and evolution of continent. Recently, the comprehensive studies in china and other countries suggest that the geochemical mapping and provincial division is a reliable method to reveal the heterogenetics, and Pb isotopic compositionhaving strong tectonic and regional characteristics. Therefore, Pb isotopic mapping is a key to revealingthe structure, formation and evolution of the lithosphere. Based on Pb isotopic mapping in south chinacontinent, it has been revealed that there exists a Pb isotopic geochemical steep zone between Yangtzeblock and Cathaysia

关键词： tetonics isotopic steep zones Yunnan.

Primary migration and secondary alteration of the Upper Paleozoic gas reservoir in Ordos Basin,china―Application of fluid inclusion gases

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science china Earth sciences 2008年第S1期51卷 165-173页

作者： GONG se 1,2 ,PENG PingAn 1 ,sHUAI YanHua 3 ,DAI JinXing 3 &ZHANG WenZheng 4.1 guangzhou institute of Geochemistry,the chinese academy of sciences,guangzhou 51064.,china 2 Common Wealth scientific and Research Organization,Petroleum Resources,PO Box 136,North Ryde,New south Wales,1670,Australia 3 Research institute of Petroleum Exploration and Development,Petrochina,Beijing 100083,china 4.Research institute of Exploration and Development,Changqing Petroleum Corporation,Xi’an 710021,china guangzhou institute of Geochemistry the Chinese Academy of Sciences Guangzhou 510640 China Common Wealth scientific and Research Organization Petroleum Resources PO Box 136 North Ryde New South Wales 1670 Australia Research institute

The composition of fluid inclusions(FI)often represents the initial geochemical characteristics of palaeo-fluid in reservoir *** on composition and carbon isotopic composition of gas during primary migration,reservoir-forming and subsequent secondary alterations are discussed through comparing fluid inclusion gas with coal-formed gas and natural gas in present gas reservoirs in the Ordos *** results show that primary migration of gas has significant effect on the molecular but not on the carbon isotopic composition of *** and diffusion fractionation took place during the secondary migration of gas in Upper Paleozoic gas reservoir according to carbon isotopic composition of methane in *** and carbon isotopic composition of natural gas were nearly unchanged after the gas reservoir forming through comparing the FI gases with the natural gas in present gas reservoir.

关键词： secondary alteration fluid inclusion carbon isotope Ordos Basin

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, chinese academy of sciences,{4., 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 （Ptsub>2sub> ） 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.

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, chinese academy of sciences,{4., 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 sup>207sup>Pb/sup>204./sup> Pb-sup>208sup>Pb/sup>204./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.

Determination of paleo-pressure for a natural gas pool formation based on PVT characteristics of fluid inclusions in reservoir rocks——A case study of Upper-Paleozoic deep basin gas trap of the Ordos Basin

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science china Earth sciences 2004年第6期47卷 507-513页

作者： MI Jingkui1,2,XIAO Xianming1,LIU Dehan1,& sHEN Jiagui1 1.state Key Laboratory of Organic Geochemistry,guangzhou institute of Geochemistry,chinese academy of sciences,guangzhou 51064.,china 2.institute of sedimentary Mineral and Resources,Department of Civil Engineering,Xiangtan Polytechnic University,Xiangtan 4.1201,china 1. state Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences 510640 Guangz China 2. institute of sedimentary Mineral and Resources Department of Civil Engineering Xiangtan Polytechnic University 411 Xiangtan China

It has been proved to be a difficult problem to determine directly trapping pressure of fluid inclusions. Recently, PVT simulation softwares have been applied to simulating the trapping pressure of petroleum inclusions in reservoir rocks, but the reported methods have many limita- tions in practice. In this paper, a method is suggested to calculating the trapping pressure and temperature of fluid inclusions by combining the isochore equations of a gas-bearing aqueous inclusion with its coeval petroleum inclusions. A case study was conducted by this method for fluid inclusions occurring in the Upper-Paleozoic shanxi Formation reservoir sandstones from the Ordos Basin. The results show that the trapping pressure of these inclusions ranges from 21 to 32 MPa, which is 6─7 MPa higher than their minimum trapping pressure although the trapping temperature is only 2─3℃ higher than the homogenization temperature. The trapping pressure and temperature of the fluid inclusions decrease from southern area to northern area of the basin. The trapping pressure is obviously lower than the state water pressures when the inclusions formed. These data are consistent with the regional geological and geochemical conditions of the basin when the deep basin gas trap formed.

关键词： Ordos Basin, fluid inclusion,PVTsim,trapping pressure.