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U-Pb Zircon Age, Geochemical, and Sr-Nd-Pb Isotopic Constraints on the Age and Origin of Mafic Dykes from Eastern Shandong Province, Eastern China

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Acta Geologica Sinica(English Edition) 2013年第4期87卷 1045-1057页

作者： LIU Shen HU Ruizhong FENG Caixia GAO Shan FENG Guangying LAI Shaocong QI Youqiang Ian M. COULSON YANG Yuhong YANG Chaogui TANG Liang State Key Laboratory of Continental Dynamics /department of Geology Northwest University State Key Laboratory of Ore Deposit geochemistry Institute of Geochemistry Chinese Academy of Sciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Solid Earth Studies Laboratory Department of Geology University of Regina

U-Pb zircon age, geochemical, and Sr-Nd-Pb isotopic data of mafic dykes from eastern Shandong Province, eastern China is reported herein. Laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） U-Pb zircon analyses of two samples from the investigated mafic dykes yield consistent ages ranging from 121.9 Ma ± 0.47 Ma to 122.9 Ma ± 0.61 Ma. The mafic dykes are characterized by high （87Sr/86Sr） i ranging from 0.7087 to 0.7089, low εNd（t） values ranging from -16.9 to -17.8, 206Pb/204Pb = 17.15 to 17.17, 207Pb/204Pb = 15.45 to 15.47, and 208Pb/204Pb = 37.59 to 37.68. Results from the current study suggest that the mafic dykes are derived from partial melting of ancient lithospheric mantle that was variably hybridized by melts derived from foundered lower crustal eclogite. The mafic dykes may have been generated through subsequent insignificant crystal fractionation and very minor crustal contamination during magma ascent. Combined with previous studies, the current findings provide new evidence that the intense lithospheric thinning beneath the eastern Shandong Province of eastern China occurred at ~120 Ma, and that this condition was caused by the removal of the lower lithosphere （mantle and lower crust）.

关键词： Eastern China eastern Shandong Province foundering mafic dykes North China Craton

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Determination of serpentine dehydration temperature at 1- 5 GPa by the method of electrical conductivity

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Chinese Science Bulletin 1996年第21期41卷 1815-1819页

作者：宋茂双谢鸿森郑海飞郭捷徐有生许祖鸣 Institute of geochemistry Chinese Academy of Sciences Guiyang 550002 China department of Geology Peking University Beijing 100871China

The stable fields of hydrous minerals are very important for us to inquire into dia-genesis,magmatism,metamorphic evolution and geochemical process of subduction *** now,the dehydration temperatures of hydrous mineral... 详细信息

关键词： high temperature and high pressure serpentine electrical conductivity dehydration temperature.

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Two stages of immiscible liquid separation in the formation of Panzhihua-type Fe-Ti-V oxide deposits,SW China

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Geoscience Frontiers 2013年第5期4卷 481-502页

作者： Mei-Fu Zhou Wei Terry Chen Christina Yan Wang Stephen A.Prevec Patricia Pingping Liu Geoffrey H.Howarth department of Earth Sciences The University of Hong Kong Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of GeochemistryChinese Academy of Sciences department of Geology Rhodes University

Magmatic oxide deposits in the～260 Ma Emeishan Large Igneous Province（ELIP）,SW China and northern Vietnam,are important sources of Fe,Ti and *** giant magmatic Fe-Ti-V oxide deposits, such as the Panzhihua,Hongge,and Baima deposits,are well described in the literature and are hosted in layered mafic-ultramafic intrusions in the Panxi region,the central *** same type of ELIP- related deposits also occur far to the south and include the Anyi deposit,about 130 km south of Panzhihua,and the Mianhuadi deposit in the Red River fault *** Anyi deposit is relatively small but is similarly hosted in a layered mafic *** Mianhuadi deposit has a zircon U-Pb age of～260 Ma and is thus contemporaneous with the *** deposit was variably metamorphosed during the Indosinian orogeny and Red River ***,magnetite of the Mianhuadi deposit contains smaller amounts of Ti and V than that of the other deposits,possibly attributable to the later *** distribution of the oxide ore deposits is not related to the domal structure of the *** major feature of all the oxide deposits in the ELIP is the spatial association of oxide-bearing gabbroic intrusions,syenitic plutons and high-Ti flood ***,we propose that magmas from a mantle plume were emplaced into a shallow magma chamber where they were evolved into a field of liquid immiscibility to form two silicate liquids,one with an extremely Fe-Ti-rich gabbroic composition and the other *** immiscible Fe-Ti-（P） oxide melt may then separate from the mafic magmas to form oxide *** parental magmas from which these deposits formed were likely Fe-Ti-rich picritic in composition and were derived from enriched asthenospheric mantle at a greater depth than the magmas that produced sulfide-bearing intrusions of the ELIP.

关键词： Fe-Ti oxide Gabbroic layered intrusion Immiscible Fe-Ti-(P) rich melt Emeishan Large Igneous Province SW China

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7~Be: A Geochemical Tracer for Seasonal Erosion of Surface Soil in Watershed of Lake Hongfeng, Guizhou, China

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Pedosphere 1996年第1期6卷 23-28页

作者： BAI ZHANGUO WAN GUOJIANG WANG CHANGSHENG WAN XI HUANGRONGGUI P.H. SANTSCHIZ and M. BASKARANZ(1￣State Key Lab. Of Environmental geochemistry, Institute of geochemistry, Chinese Academy of Sciences,Guiyang 550002 (China))(2￣department Of Marine Scien State Key Lab. of Environmental geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China.

e penetrative depth in undisturbed surface soil is within 4 mm.7￣Be activity shows exponential decrease with soil depth, which is expressed as a diffusion process.7￣Be penetrative depth in undisturbed surface soil is apparently deeper in the fall (0.22-0.37 g cm￣(-2) than in the spring (0.11-0.28 g cm￣(-2) at the same site; Whereas, ￣7Be apparent activity at the top of surface soil is higher in the spring (0.3-2.2 Bq g￣(-1_) than in the fall (0.2-0.5 Bq g￣(-1) at the same site. The ￣7Be inventory (189-544 Bq m￣(-2) changes with both locations and seasons. Although the ￣7Be flux to the earth's surface increases with amount of precipitation, its maximum inventory in the soil profiles decreases to 30%-40% after the rainy period. Calculated by the diffusion equation, the erosion and accumulation rates of soil particles are agreeable with the observation in situ., which shows that the rates in fall are 1.5 times those in spring. The eroded soil particles almost all have been removed on the tablelands rather than transported into the drainage system. This indicstes that the soil erosion process in the karst region is only partial transportation within a short distance.

关键词： e erosion trace Lake Hongfeng watershed surface soil

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Evaluation of the Cr(VI) and other toxic element contamination and their potential sources:The case of the Thiva basin(Greece)

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Geoscience Frontiers 2012年第4期3卷 523-539页

作者： M.Economou-Eliopoulos D.Antivachi Ch.Vasilatos I.Megremi department of Geology & Geoenvironment Section of Economic Geology & Geochemistry.University of AthensPanepistimiopolisAthens 15784Greece

An integrated approach was performed on the soil, plant-crops and groundwater system at the Thiva basin, to evaluate the extent and intensity of the heavy metal contamination, the percentage of metals transferred into plants/crops （bio-accumulation） and the potential sources of contamination. Heavy metal contents （230--310 Cr, 1200--2200 Ni, 50--80 Co, 880--1150 Mn and 44,500--66,200 Fe all in ppm ） in the Thiva soils are higher than those in the Assopos basin. An increasing trend in the heavy metal contents, from the Assopos to the Thiva basin （Mouriki）, indicates that the metal source is probably the Ni-laterites and ophiolites, located towards north. On the other hand, groundwater samples from domestic and irrigation wells throughout the Thiva basin exhibit relatively low （8--37 ppb） concentrations in Cr compared to the Assopos （up to 150 ppb）. The plots of Cr versus Mg/Ca, Mg/Na versus Ca/Na, B versus Si/（Si ＋ Na） and Mg/Si versus Ca/Si ratios revealed a low degree of salinization in the Thiva compared to that in the Assopos （Avlida） basin. The low Cr concentration （average 23 ppb, during dry period） in the Thiva wells may be related with their depth （〉120 m）, in contrast to shallow wells in the central Euboea （hundreds ppb Cr） and points to a solution of a crucial environmental problem in Euboea and Assopos basin by using the deep karst-type aquifer instead the shallow-Neogene one. The average Cr contents （dry weight） ranges from 1.7 to 4.6 ppm （average 2.2） in carrots, potatoes and onions. The percentage of soil metals Crto^i, Cr（Vl）, Ni, Mn and Fe ranges between 0.06 and 3.2 （average （/.53 ~ 0.4）, whilst that for Cu and Zn ranges from 16 to 81 （average 36 ~ 24）. The Cr transfer to plants is low, due to the high resistance of chromite （main host of Cr）, but the determined Cr contents in plant- crops in the Thiva basin are higher than normal or sufficient vahles. Although mininml uptake for growth and production for Cr, Ni, Zn and Cn is still lacking, fnrtherm

关键词： Cr(VI) Contamination Plants Groundwater Bio-accumulation Thiva

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Application of C5-C13 light hydrocarbons in depositional environment diagnosis

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Progress in Natural Science:Materials International 2008年第9期18卷 1129-1137页

作者： Peirong Wanga,b,, Guanjun Xu a,c, Tingrong Xiaoc, Dajiang Zhanga,c, Bin Zhanga,c a Key Laboratory of Petroleum geochemistry, China National Petroleum Corporation, Beijing 100083, China b department of Organic geochemistry, Yangtze University, Jingzhou 434023, China c Central Laboratory of Petroleum Geology, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China Key Laboratory of Petroleum geochemistry China National Petroleum Corporation Beijing 100083 China department of Organic geochemistry Yangtze University Jingzhou 434023 China Central Laboratory of Petroleum Geology Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China

Based on the geological background and Gammacerane/C31H(S + R) ratios, source rock depositional environments of the studied oil samples (194) from 13 oilfields were classified into three groups according to salinity:saline-lacustrine facies, fresh to brackish lacustrine facies (including limnetic facies), and semi-saline to saline facies (including marine facies of the Tarim Basin).C5-C13 compound groups in the crude oils were separated by GC, and about 286 compounds were qualitatively *** geochemical application of the C6-C13 compound groups and their ratios between each group with individual carbon number was *** studies show that (1) C6-C13 compound groups and their ratios in the crude oils could serve as new reliable parameters for oil-oil correlation because the C6-C13 light fractions are the major oil component, especially in light oil or condensate, in which they account for almost 90% of the whole oil;(2) the compound groups of C7 light hydrocarbons in oils derived from difierent depositional environments with difierent salinity have difierent characteristics;(3) C6-C13 compound groups and ratios may be afiected by other factors such as maturity, but they are mainly controlled by salinity of depositional waters.

关键词： Light hydrocarbons Crude oil Depositional environment Salinity

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A New Method of Measurement for Elastic Wave Velocities in Minerals and Rocks at High Temperature and High Pressure and Its Significance

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Science China Chemistry 1993年第10期36卷 1276-1280页

作者：谢鸿森张月明徐惠刚侯渭郭捷赵鸿儒 Institute of geochemistry Academia Sinica Guiyang 550002 PRC department of Geophysics Peking University Beijing 100871 PRC

We developed a new method of measurement for elastic wave velocity of rocks and minerals at high temperature and high pressure in a wedge-type cubic anvil. The shear-wave and other ultrasonic wave can be identified by full wave phase analysis (FWPA), thus the velocities of compression-wave and shear-wave can be obtained in a single experiment. We have done the measurements of elastic wave velocities on pyrophyllite, etc. at high pressure (0.1—5.5 GPa) and high temperature (ambient temperature 1600℃), the ranges of the pressure and the temperature are in the head among the methods of the wave velocites measurement in laboratory in the world.

关键词： high temperature and high pressure elastic wave velocity rock and mineral.

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Hydrocarbon Vertical Continuity Evaluation in the Cretaceous Reservoirs of Azadegan Oilfield, Southwest of Iran: Implications for Reservoir geochemistry

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Acta Geologica Sinica(English Edition) 2020年第3期94卷 847-860页

作者： Bahram ALIZADEH Mehrab RASHIDI Alireza ZARASVANDI Seyed Rasoul SEYEDALI Mohammad Hasan ALIEE department of Geology Faculty of Earth SciencesShahid Chamran University of AhvazAhvazIran Petroleum Geology and geochemistry Research Center(PGGRC) Shahid Chamran University of AhvazAhvazIran geochemistry department Exploration DirectorateNational Iranian Oil Company(NIOC)TehranIran Geophysics department Exploration DirectorateNational Iranian Oil Company(NIOC)TehranIran

A collection of data obtained from analytical methods in geochemistry along with the reservoir engineering and geologic data were used to investigate the reservoir continuity in the Cretaceous Fahliyan, Gadavan, Kazhdumi and Sarvak reservoirs of the super-giant Azadegan oilfield, SW Iran. The geochemical data indicate that the oil samples, with medium to high level of thermal maturity, have been generated from the anoxic marine marl/carbonate source rock(s). The Sargelu(Jurassic) and Garau(Cretaceous) formations are introduced as the main source rocks for the studied oils. The dendrogram obtained from the cluster analysis of high-resolution gas chromatography data introduces two main oil groups including Fahliyan reservoir, and Kazhdumi along with Sarvak/Gadvan reservoirs. This is confirmed by C7 Halpern star diagram, indicating that, the light oil fraction from Fahliyan reservoir is distinct from the others. Also, different pressure gradient of the Fahliyan Formation(over-pressured) relative to other reservoirs(normally-pressured) show the presence of compartments. The relation between toluene/n-heptane and n-heptane/methylcyclohexane represents the compartmentalization due to maturation/evaporative fractionation for Fahliyan and water washing for other studied reservoirs. Also, the impermeable upper part of the Fahliyan Formation and thin interbedded shaly layers in the Kazhdumi, Sarvak and Gadvan formations have controlled reservoir compartmentalization.

关键词： reservoir continuity geochemistry pressure gradient oil-oil correlation Azadegan oilfield Abadan Plain

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Clay Minerals in Lake Frome Sediments of Australia and Their Paleoclimatic Implications

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Acta Geochimica 1986年第3期5卷 241-249页

作者：郑洪汉 J.M.BOWLER department of Biogeography and Geomorphology Australian National University Institute of geochemistry Academia Sinica

Clay minerals in 32 samples collected from the upper 6 meters of drill core LF 82/1-3 inLake Frome, Australia have been examined using X-ray powder diffraction techniques. Theresults show that the clay mineral species are predominated by illite, kaolinite and a smallamount of montmorillonite. Minor chlorite and verndculite can also be identified in some of thesamples. In terms of clay mineral species, crystallinity and other characteristics, the upper 6-mcore can be divided into 3 sections, the boundaries of which are marked at depths of about 125-150 cm and 415-455 cm with ages of 14 and 19 thousand years B.P., respectively. The middlesection at a burial depth of 150-415 cm may have been deposited under moist conditions whilethe other two under relatively dry conditions. Additionally, some slight climatic fluctuationsseem possible in different stages.

关键词： Lake Clay Minerals in Lake Frome Sediments of Australia and Their Paleoclimatic Implications

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Particle number concentration, size distribution and chemical composition during haze and photochemical smog episodes in Shanghai

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Journal of Environmental Sciences 2014年第9期26卷 1894-1902页

作者： Xuemei Wang Jianmin Chen Tiantao Cheng Renyi Zhang Xinming Wang Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3) Fudan Tyndall CentreDepartment of Environmental Science & EngineeringFudan University Center for Atmospheric Chemistry and Environment Department of Atmospheric ScienceTexas A&M UniversityTX 77843USA State Key Laboratory of Organic geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences

The aerosol number concentration and size distribution as well as size-resolved particle chemical composition were measured during haze and photochemical smog episodes in Shanghai in 2009. The number of haze days accounted for 43%, of which 30% was severe （visibility 〈 2 km） and moderate （2 km 〈 visibility 〈 3 km） haze, mainly distributed in winter and spring. The mean particle number concentration was about 17,000/cm3 in haze, more than 2 times that in clean days. The greatest increase of particle number concentration was in 0.5-1μm and 1-10 μm size fractions during haze events, about 17.78 times and 8.78 times those of clean days. The largest increase of particle number concentration was within 50-100 nm and 100-200 nm fractions during photochemical smog episodes, about 5.89 times and 4.29 times those of clean days. The particle volume concentration and surface concentration in haze, photochemical smog and clean days were 102, 49, 15 μm3/cm3 and 949, 649, 206 μm2/cm3, respectively. As haze events got more severe, the number concentration of particles smaller than 50 nm decreased, but the particles of 50-200 nm and 0.5-1μm increased. The diurnal variation of particle number concentration showed a bimodal pattern in haze days. All soluble ions were increased during haze events, of which NH4, SO24- and NO3 increased great/y, followed by Na＋, IC, Ca2＋ and CI-. These ions were very different in size-resolved particles during haze and photochemical smog episodes.

关键词： HazePhotochemical smogParticle number concentrationSize distributionChemical compositionShanghai

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