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  • Table of Content
      24 October 2008, Volume 32 Issue 5 Previous Issue    Next Issue
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    NEW HYDROCARBON DETECTION TECHNIQUE BASED ON CONVENTIONAL CONCEPT OF ADSORBED HYDROCARBON
    Cheng Tong-jin
    Geophysical and Geochemical Exploration. 2008, 32 (5): 456-460.  
    Abstract   HTML   PDF (960KB) ( 673 )

    Hydrocarbon is a direct indicator to underground oil and gas reservoirs in surface oil and gas geochemical exploration. The hydrocarbon gas detected by acid-extraction method used at present in oil and gas geochemical exploration practice should be defined as "occluded hydrocarbon" instead of "adsorbed hydrocarbon", because this kind of hydrocarbon is combined with such media as soil grains. The surface anomaly of acid-extraction hydrocarbon is highly stable and has good repeatability, suggesting that the hydrocarbon migration process did occur during the geological history. Nevertheless, when used to reflect the information of deep oil and gas, the surface anomaly of acid-extraction hydrocarbon is subject to multi-interpretation. In view of this weakness of the acid-extraction method, a set of hydrocarbon desorption devices have been designed and developed, and a new extraction method and technique for soil adsorption hydrocarbon has been established. This newly developed hydrocarbon detecting technique can be used to collect the dynamic information of petroleum system at surface, intensify the study of hydrocarbon sources in the course of surface hydrocarbon measurement, and improve the prediction success ratio in surface oil and gas geochemical exploration practice.

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    A REVIEW OF THIRTY YEARS' GOLD GEOCHEMICAL EXPLORATION IN SOUTHWESTERN GUIZHOU AND A PROSPECT FOR FUTURE WORK
    HE Shao-lin, ZENG Zhao-guang, LUO Ming-xue, LIU Ying-zhong, HU Cong-liang, MU Jun
    Geophysical and Geochemical Exploration. 2008, 32 (5): 461-464.  
    Abstract   HTML   PDF (352KB) ( 569 )

    Exploration geochemistry is an important method and technique for rapid seeking gold deposits from southwest Guizhou. In last 30 years, many important prospecting clues and targets of micro-disseminated gold deposits, which are difficult to distinguish by naked eyes, were provided according to exploration geochemical gold anomalies. It is suggested that there are predominant in geochemical conditions, more resource perspective and prospecting potential in inner structures of gold geochemical blocks and pedigrees of nested geochemical modeling from gold exploration geochemical history and investigation in southwest Guizhou, and the methods from geology, exploration geophysics, remote sense and et al. are needed to integrate with exploration geochemistry towards more seeking gold deposits and historical tasks.

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    PRESENT RESEARCH SITUATION AND DEVELOPMENT TREND OF HYDROCARBON VERTICAL MICROSEEPAGE THEORY
    TANG Yu-ping, WANG Guo-jian, CHENG Tong-jin
    Geophysical and Geochemical Exploration. 2008, 32 (5): 465-469.  
    Abstract   HTML   PDF (373KB) ( 616 )

    The hydrocarbon vertical microseepage theory is the basic theory for oil and gas exploration. Nevertheless, the study of this theory has been very insufficient, which affects the deepgoing study and extensive application of oil and gas geochemical exploration. Therefore, the strengthening of the study in this aspect is quite necessary. Starting with the concept of the oil and gas microseepage action, this paper deals with the complexity of the hydrocarbon vertical microseepage process, sums up the present research situation and major development in the study of this theory, and forecasts its development trend.

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    A DISCUSSION ON SYNCHRONOUS FLUORESCENCE TECHNOLOGY IN OIL AND GAS GEOCHEMICAL EXPORATION
    HU Bin, Li Guang-zhi, CHENG Gui, YUAN Zi-yan
    Geophysical and Geochemical Exploration. 2008, 32 (5): 470-472.  
    Abstract   HTML   PDF (789KB) ( 598 )

    Based on experiments, this paper deals with several problems concerning the constant-wavelength synchronous fluorescence technology in oil and gas geochemical exploration, which include the interpretation of the spectra, the correlation between Δλ and method sensitivity, and the intrinsic relationships between different fluorescence methods. The understanding of these problems is helpful to the improvement of the application and development of this technology in oil and gas geochemical exploration.

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    ADVANCES IN THE RESEARCH OF GEOCHEMICAL EXPLORATION METHODS IN SPECIAL LANDSCAPE AREAS OF WESTERN CHINA
    ZHANG Bi-min,
    Geophysical and Geochemical Exploration. 2008, 32 (5): 473-476.  
    Abstract   HTML   PDF (678KB) ( 597 )

    The study of the geochemical exploration methods in special landscape areas of western China has been a hotspot and difficult research point in geochemical prospecting work. In rock-exposed and stream-developed areas we can still use the traditional geochemical stream sediment survey method, but in the covered landscape areas it is not proper to use the conventional methods. At present, with the performance of lots of experiments, it has been proved that the Deep-Penetrating Geochemical Prospecting Method introduced recently can define strategic targets speedily and effectively in the coverage area, thus having wide application prospect. To improve geochemical exploration in special landscape areas of western China, geochemical exploration researchers need to take new methods and new thoughts and systematically develop the research on geochemical methodology, thus finally formulizing a full set of effective geochemical methods suitable for special landscape areas, especially for coverage areas in western China.

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    THE APPLICATION OF GPS TECHNOLOGY TO GEOCHEMICAL EXPLORATION
    WANG Hui-feng, PENG Li-hua, AN Xing, CHEN En-ke
    Geophysical and Geochemical Exploration. 2008, 32 (5): 477-479.  
    Abstract   HTML   PDF (883KB) ( 609 )

    The GPS global positioning system is a suite of satellite system which is composed of 24 satellites and can continuously send time and position information to the Earth's GPS receiver. Through decomposition and calculation, it can give various kinds of information of mobile bodies. At present, this positioning system has been widely used. In geochemical exploration, it is mainly used in such aspects as pinpoint, navigation and flight path monitoring, thus providing guarantee to field work quality monitoring. Combined with MapSource and MapGis softwares, it can realize management of geochemical data based on information and compilation of various geochemical maps, thus remarkably reducing the labor intensity of geochemists.

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    THE FOLLOW-UP METHODS FOR REGIONAL GEOCHEMICAL ANOMALIES IN FOREST-SWAMP LANDSCAPE AREAS
    YANG Shao-ping, JIAO Bao-quan, SUN Zhong-jun, ZHANG Xue-jun, XU Ren-ting, LU Xue-pu, PAN Wen-sheng, BO Xiang-zong
    Geophysical and Geochemical Exploration. 2008, 32 (5): 480-487.  
    Abstract   HTML   PDF (2183KB) ( 593 )

    The follow-up methods for regional geochemical anomalies were studied in four areas with the forest-swamp middle-low mountain landscape. Some conclusions were summarized: ① Stream sediment survey of -10~+60 mesh with sampling density of 3~4 samples/km2 is a good method in search for small-large sized deposits; ② pedogeochemical method collecting layer-B residual and slope materials of -20 mesh is also a good method, which uses an irregular network with sampling density of about 4 samples/km2 along piedmont and ridge; ③ soaked soil survey with 6~7 samples/km2 for follow-up in talus areas can be effectively used; ④ peat survey method should not be applied because it only provides poor information of mineralization.

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    GEOCHEMICAL SUBAREAS OF THE MIDDLE PART OF EAST TIANSHAN MOUNTAIN AND THEIR CHARACTERISTICS
    CUI Bin, HE Zhi-jun, ZHAO Lei, DONG Lian-hui, LIU Tuo, QU Jun
    Geophysical and Geochemical Exploration. 2008, 32 (5): 488-491,513.  
    Abstract   HTML   PDF (943KB) ( 704 )

    Lying in the north margin of Talimu plate, the East Tianshan Mountain has very complicated tectonic background. As there exist remarkable differences in tectonic evolution, magmatic activity, geochemical environment, strata and structural distribution in different parts of the area, geochemical division of the area into subareas should be performed. Four geochemical subareas were distinguished in the study area, i.e., Dananhu islend arc, Xiaorequanzi interarc basin, Kangguer ductile shear deformation belt, and Yamansu back-arc basin. Distribution of Cu, Au high values shows that their ore-forming processes and enrichment are rather complex. The study of these problems has laid a solid foundation for the determination of geochemical backgrounds and thresholds as well as the integrated ore prognosis.

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    THE PREPARATION OF GEOCHEMICAL SPECIATION CERTIFIED REFERENCE MATERIALS FOR MAIN SOIL TYPES OF CHINA
    LIU Mei, GU Tie-xin, SHI Chang-yi, YAN Wei-dong, YAN Ming-cai
    Geophysical and Geochemical Exploration. 2008, 32 (5): 492-496,508.  
    Abstract   HTML   PDF (487KB) ( 729 )

    Geochemical speciation certified reference materials are mainly used for speciation analysis in regional geochemical survey and evaluation. Five soil samples for different soil types were prepared. This paper deals with the stability of the samples which seems to constitute the key problem in the standard material development and lists the certified values and uncertainties of 16 elements in soluble, exchangeable, carbonate bound, humic acid bound, iron and manganese oxides bound, strong organic matter bound and residual state. Moreover, The precisions of the certified values are also discussed.

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    GEOCHEMICAL CHARACTERISTICS OF As AND Cd IN SOILS OF YUNNAN PROVINCE
    LI Li-hui, WANG Bao-lu
    Geophysical and Geochemical Exploration. 2008, 32 (5): 497-501.  
    Abstract   HTML   PDF (1899KB) ( 896 )

    Based on 1:200 000 stream sediment survey and partial results of soil survey, the authors summed up geochemical backgrounds of As and Cd and their anomaly distribution in different media and all types of soils and bedrocks, analyzed their enrichment regularity and sources. It is concluded that the background content of As and Cd in the soil is higher than their content in the stream sediment, and is by far higher than their average content in the Earth's crust. As and Cd content is highest in lime soil and limestone, being 1.5 times of their average soil content in Yunnan Province. The background content tends to rise with the increase of pH. The high geochemical anomaly is consistent with the karst area. Seven anomaly zones of As and twelve anomaly areas of Cd were delineated, with the most outstanding anomalies all located in southeastern Yunnan where desertification is severely developed. Heavy metal anomalies of As and Cd are mainly derived from the bedrock of high background content (carbonate rock), and the main reason for its enrichment is that carbonate soil with high pH and high CEC is heavy and viscous, its organic content is high, the migration rate of As and Cd decreases and their remaining content increases, resulting in high enrichment of soil As, Cd content in some areas of Yunnan Province where carbonate rock is well developed.

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    A COMPARISON IN APPLICATION EFFECTS BETWEEN OLD AND NEW REGIONAL GEOCHEMICAL EXPLORATION METHODS IN FOREST-SWAMP LANDSCAPE AREAS
    WANG Hui-feng, PENG Li-hua, AN Xing, WANG Xiao-yun, CHEN En-ke
    Geophysical and Geochemical Exploration. 2008, 32 (5): 502-508.  
    Abstract   HTML   PDF (2046KB) ( 551 )

    1:200 000 regional geochemical exploration was carried out in forest-swamp landscape areas, different units have used somewhat different methods and techniques at different working stages, but without obvious effects. Based on tests and studies, the Institute of Geophysical and Geochemical Exploration has formulated a new working method, which holds that in 1:200 000 stream sediment survey the adoption of the sampling grain size grade of -10~+60 mesh and the sampling density of 1~2 points/4 km2 can yield good results. Exemplified by regional geochemical exploration in the 1:200 000 125 km Sheet, the authors made an analysis and comparison between the old and new methods and techniques.

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    THE DEVELOPMENT AND APPLICATION OF THE TRANS-PLATFORM GEOSCIENCE SOFTWARE
    LI Wan-zhong, PENG Zhong-qiu, HUANG Xian-yi, YUAN Xiao-long, LU Feng, ZHU Shou-hui, SUN Hai-fang, DUAN Xin-li, BI Wu
    Geophysical and Geochemical Exploration. 2008, 32 (5): 509-513.  
    Abstract   HTML   PDF (1733KB) ( 585 )

    In the development of GeoIPAS software code, the style unrelated to the operation system resource is adopted, and the software can realize trans-platform operation. This is to say that the source code is compiled into the corresponding performable program under the required operation system. The trans-platform software has such advantages as short integrated development cycle, low development cost, abundant software products and easy later upgrade and maintenance. Its application to the geoscience software can effectively strengthen the advanced nature, practicability, easiness and safety of the software, thus having a great significance in the development of geoscience software and geological exploration work.

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    THE STUDY AND APPLICATION OF NEW GEOCHEMICAL EXPLORATION TECHNIQUES IN XIN BARAG RIGHT BANNER, INNER MONGOLIA
    LI Xiao-hong, XIAO Cheng-dong, CHAI She-li, JIANG Hao
    Geophysical and Geochemical Exploration. 2008, 32 (5): 514-518.  
    Abstract   HTML   PDF (924KB) ( 720 )

    The evaluation of ore-prospecting effects in thick overburden areas has long become a difficult point in geological exploration work. Based on method experiments in the Erentaolegai silver ore district of Xin Barag Right Banner, the authors have reached the conclusion that, in arid and airborne sand thick overburden areas, anomalies can be discovered by adopting the sampling depth of 40 cm, grain size of —140 mesh, ionic conductivity with stirring time of over 1 min, heat-release mercury with temperature of 800℃ and the measurement of water-soluble state and adsorption state of the element active state. In Adunchulu and Harule Obo prospective areas, the anomalies delineated by these methods are quite consistent with those delineated by routine soil geochemical survey and have obvious concentration centers.

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    GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS AND TECTONO-GEOCHEMICAL PROSPECTING WORK IN LIAOJIA OF QIMEN, ANHUI PROVINCE
    QIAN Jian-ping, HE Sheng-fei, WANG Fu-min, CHENG Jin-hua
    Geophysical and Geochemical Exploration. 2008, 32 (5): 519-524,528.  
    Abstract   HTML   PDF (641KB) ( 718 )

    According to 1:10000 geological survey and 1:1000 geological profile survey in the study area,the authors summed up the lithologic combination and sedimentary characteristics, the basic structure framework, the main ore-control structures and the evolution history. On such a basis and by using the tectono-geochemical prospecting method, the authors have reached the following conclusions: The NE-and nearly EW-trending fractural structures formed the main structural framework in this area. From early to late, the tectonic evolution of this area can be divided into four stages, namely the NW-SE compression (pre-metallogenic), the S-N compression (pre-metallogenic), the NW-SE extension (metallogenic) and NW-SE extension (metallogenic). Factor analysis and correspondence analysis show that both Shangxi Group and quartz veins are rich in iron group elements such as Cr, Ni, Co, V and Ti, suggesting that there exists a definite affinity in their composition. Au is strongly correlated to As in quartz veins, and As is likely to act as an ore-forming medium in gold mineralization. The utilization of the fractal method to study the fractal texture of gold content in different geological bodies has been studied in this paper. The fractal textures of magmatic rocks and quartz veins are simple. Their fractal dimension values are of three sections, and those of Shangxi Group are of five sections. Factor score contour diagram indicates that the high score sections of F1 factor(Cr, Ni, V, Ti, Co)are consistent with the distribution areas of magmatic rocks. The high score sections of the metallogenic elements are controlled by NE- and nearly EW-trending geological structures. It is obvious that the WE-trending fracture is the key section for further gold ore-prospecting work. Gold deposits in this area are mainly of the types of gold-bearing quartz veins and interstratified fracture zone. Shangxi Group was probably the source of metallogenic substance for gold mineralization in this area, magma mainly offered heat, and geological structures acted as mechanism of metallogenic action and favorable metallogenic environment as well as ore concentration space.

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    THE STRUCTURAL SUPERIMPOSED HALO MODEL FOR PROGNOSIS OF No.2 ENRICHMENT ZONE AT THE DEPTH OF THE XIAO QINLING GOLD ORE CONCENTRATION AREA
    LI Hui, ZHANG Guo-yi, GAO Yan-long, ZHAO Zong-qin, LI De-liang, YU Bin, SHAO Jian-bo, GUO Chao-yan
    Geophysical and Geochemical Exploration. 2008, 32 (5): 525-528.  
    Abstract   HTML   PDF (630KB) ( 631 )

    This paper has dealt with the common features of three superlarge typical quartz-vein type gold ore deposits (Wenyu, Qinling and Dongtongyu) in Xiao Qinling region, established the ideal structural superimposed halo model for prognosis in No.2 enrichment zone at the depth of Xiao Qinling quartz vein type gold ore deposits, and determined the prognostic criteria for blind deposits in the ore district. As a result, satisfactory ore-prospecting results were obtained.

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    THE STRUCTURAL SUPERIMPOSED HALO MODEL FOR THE DIAOQUAN SKARN SILVER-COPPER DEPOSIT IN LINGQIU COUNTY, SHANXI PROVINCE
    LI Hui, ZHANG Guo-yi, LI De-liang, YU Bin, WANG Zhi-yuan, XU Li-yun, CHEN Jian-fei
    Geophysical and Geochemical Exploration. 2008, 32 (5): 529-533.  
    Abstract   HTML   PDF (793KB) ( 667 )

    Based on a study of characteristics of element associations and structural superimposed halos at different ore-forming stages of the Diaoquan skarn silver-copper deposit in Lingqiu County of Shanxi Province, the authors established a structural superimposed halo model for prognosis of blind ore bodies at the depth of the ore deposit. The prognostic results show that this model is very effective in search for blind ore bodies.

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    THE ROLE OF THE ARTIFICIAL ELECTRIC FIELD IN THE FORMATION OF GEOELECTROCHEMICAL IONIC HALOS
    KANG Ming, MA Meng-hao
    Geophysical and Geochemical Exploration. 2008, 32 (5): 534-536,548.  
    Abstract   HTML   PDF (674KB) ( 522 )

    Test data indicate that the artificial electric field can activate and change the binding modes of occurrence of elements in the soil. On the one hand, It can bring about decomposition of a great number of complex anions and other stable or sub-stable forms of elements, and on the other hand, it can make anions and cations move to the extraction electrode, and can accelerate ionic movement, as can be seen from the comparison of the artificial electric field and the extracted liquid in the element-collectors (ECs), no matter whether the artificial electric field is close to the ECs or not and how different the modes of occurrence of elements in the samples from the soil are. In fact, it is quite impossible for the artificial electric field to extract directly the metal ions from the ore body at depth.

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    THE APPLICATION OF GEOCHEMICAL INFORMATION TO ORE EXPLORATION IN SHANGRI-LA AREA, YUNNAN PROVINCE
    XUE Shun-rong, XIAO Ke-yan, DING Jian-hua
    Geophysical and Geochemical Exploration. 2008, 32 (5): 537-540.  
    Abstract   HTML   PDF (909KB) ( 587 )

    The discovery of the huge-sized and semi-concealed Pulang porphyry copper deposit shows the forecasting effect of exploration geochemistry information. Starting with an analysis of metallogenic geological settings and geochemical prospecting creteria of typical deposits, this paper deals with the guiding significance of Cu and Cu-W-Mo accumulated index anomalies with different precisions for the prospecting of porphyry copper deposits.

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    THE APPLICATION OF HYDROGEOCHEMICAL SURVEY TO DEFINING OREFIELD AND ORE DEPOSIT TARGETS
    ZHAO Li-qing, DENG Jun, YUAN Hai-tao, ZHAO Feng-Wen
    Geophysical and Geochemical Exploration. 2008, 32 (5): 541-544.  
    Abstract   HTML   PDF (335KB) ( 464 )

    One water sample per 2 km×2 km was taken along marginal faults of Linglong Complex. pH, conductivity and sulfate were measured in the field. IGGE did an analysis of indicator elements. High Au, high sulfate, low pH, high Cu, Pb, Bi, Sb, Cd, and locally high As are indicators of gold mineralization. There exists a very good hydrogechmical anomaly composed of sulfate, pH, Cu, Cd, Sb, Zn, Bi in the Linglong-Taishang orefield. In addition to the Beibo-Xidian orefield and the Dayingezhuang-Caojiawa orefield, a few new potential prospective targets were delineated. (Well) water geochemical survey can be a useful method for gold exploration in Jiaodong Peninsula. Hydrogeochemical survey is hopefully applied to delineating orefield or ore deposit targets in Quaternary cover and/or exposed areas with dense population.

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    THE BAIBUKA LEAD-ZINC DEPOSIT IN WEINING COUNTY OF GUIZHOU PROVINCE: ITS CHARACTERISTICS AND ORE-SEARCH PROSPECTS
    HONG Wan-hua, YAN Xue-chun
    Geophysical and Geochemical Exploration. 2008, 32 (5): 545-548.  
    Abstract   HTML   PDF (772KB) ( 547 )

    Using such new geochemical evaluation theories as planar metal amounts, zoned values of anomaly concentrations and integrated quantitative indices of regional geochemical anomaly sieving in combination with geological and mineral resources data, geophysical high-precision magnetic anomalies and remote-sensing anomalies, the authors evaluated the Baibuka lead-zinc deposit and analyzed its ore-search prospects.

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    THE APPLICATION OF δ13C1 TO SURFACE GEOCHEMICAL EXPLORATION AND ITS EXISTING PROBLEMS
    WANG Guo-jian, CHENG Tong-jin, TANG Yu-ping, HUANG Xin, ZHU Huai-ping
    Geophysical and Geochemical Exploration. 2008, 32 (5): 549-552.  
    Abstract   HTML   PDF (347KB) ( 794 )

    δ13C1, as a tracer of gas hydrocarbon, serves as a method for judging the source of hydrocarbon in surface geochemical exploration. The δ13C1 criterion of organic geochemistry is always used to ascertain the origin of hydrocarbon in soil by analyzing different modes of occurrence of hydrocarbon, but the results are generally not convincing. Based on an analysis of δ13C1 in different modes of occurrence of hydrocarbon in soil over known areas, it is thought that δ13C1 in anomalous hydrocarbon has its own characteristics because of such affecting factors as fractionation and parent rock migration mechanism. The interfering factors must be considered when δ13C1 is applied so as to establish the relationship between δ13C1 of trace hydrocarbon at surface and that in oil/gas accumulation. On such a basis, real anomalies can be distinguished from false ones, and hence reliability of SGE anomaly can be improved.

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    THE APPLICATION OF SOIL RADON SURVEY TO THE EXPLORATION OF SANDSTONE-TYPE URANIUM DEPOSITS IN SNT AREA
    YE Qing-sen, TANG Zhi-yuan, XIAO Sang, CHAO Xiao-lin, FAN Shao-yun, XIAO Jian-jun
    Geophysical and Geochemical Exploration. 2008, 32 (5): 553-555,558.  
    Abstract   HTML   PDF (725KB) ( 617 )

    Soil radon survey was conducted in search for hidden and blind sandstone-type uranium deposits in SNT area of Eren basin in order to minimize blindness of borehole layout in prospecting for ore deposits and realize fast evaluation in northern China. Six radon anomalies of certain sizes were delineated in the survey area on the basis of statistic processing of radon survey data. Three potential sectors were forecast by radon anomaly appraisal combined with geological, geophysical and geochemical conditions in the area, with sandstone-type uranium mineralization found through drilling in one of the sectors, which shows that the soil radon survey is effective and feasible in search for hidden and blind sandstone-type uranium deposits in Cenozoic and Mesozoic basins of northern China.

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    GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF THE KEMIXI COPPER DEPOSIT
    ZHENG Guo-sheng
    Geophysical and Geochemical Exploration. 2008, 32 (5): 556-558.  
    Abstract   HTML   PDF (290KB) ( 536 )

    the Kemixi copper deposit was found through the inspection of an anomaly discovered in geochemical reconnaissance. The author made an analysis and study of the stratigraphic, stream sediment and surface geochemical characteristics of this area and described briefly its metallogenic environment.

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    THE INVESTIGATION OF NATURAL RADIATION ENVIRONMENTAL GEOLOGY OF QINGDAO CITY
    XIA Ning, JIANG Xue-jun, DIAO Shao-bo, LI Shao-quan, ZHANG Hong, XU Ting-ting
    Geophysical and Geochemical Exploration. 2008, 32 (5): 559-563.  
    Abstract   HTML   PDF (827KB) ( 698 )

    Investigation and evaluation of the natural radiation level of Qingdao City were conducted by Qingdao Institute of Marine Geology from 2003 to 2005. The radioactive level of Qingdao City remains within the safe range of the natural background level, although the average dosage rate of the terrestrial γ-radiation is slightly higher than that of the National and Shandong Province Standard. The level of the terrestrial γ-radiation seems on the whole controlled by the local rocks. The terrestrial γ-radiation results from 232Th, 235U and 40K, while 40K or/and 232Th contribute more to the terrestrial γ-radiation than 238U, which is different from things of the other areas. In addition, the amounts of radionuclide contained in such materials as masonry, cement and concrete used for many construction projects like roads and architecture affect the level of terrestrial γ-radiation of the construction projects.

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    THE MAIN FACTORS AFFECTING THE SOIL-LOQUAT ECOLOGICAL SYSTEM IN THE LOQUAT PRODUCING AREA OF PUTIAN
    WANG Hui
    Geophysical and Geochemical Exploration. 2008, 32 (5): 564-566,570.  
    Abstract   HTML   PDF (294KB) ( 611 )

    Based on a study of geochemical characteristics of the Putian loquat producing area in Fujian Province, the author made a preliminary discussion on the main factors affecting the soil-loquat ecological system. The Earth's surface environment conditions such as sunshine, temperature, humidity and terrain are important factors affecting the growth of loquat. The mother rock type of soil, different varieties of loquat and such physical-chemical qualities of soil as pH values, organic matter, exchangeable base cations also affect in different degrees the soil-loquat ecological system.

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    THE INVESTIGATION AND EVALUATION OF HCH RESIDUES IN SOILS OF BEIJING SUBURBS
    LIU Chen, CHEN Jia-wei, YANG Zhong-fang, TAO Ye
    Geophysical and Geochemical Exploration. 2008, 32 (5): 567-570.  
    Abstract   HTML   PDF (592KB) ( 625 )

    HCHs were detected in the soil of analytic area in the suburbs of Beijing. The concentrations of HCHs in the samples are σ-HCH>β-HCH>γ-HCH>α-HCH and the γ-HCH in all the samples is not the main component of residues, suggesting that no new HCHs have entered soil of the studied area. Compared with the commercial HCHs, the contents of HCHs isomers have changed considerably, the content of α-HCH and γ-HCH have decreased while β-HCH and σ-HCH have increased. The degeneration ratios of isomers are α-HCH>γ-HCH>σ-HCH>β-HCH. Although there are no new HCHs that can pollute this area, the risk remains existent.

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    GEOCHEMICAL ASSESSMENT OF SOIL CONTAMINATION IN THE PLANNING AREA OF LANGFANG CITY
    SHI Shu-juan, GONG Jin-zhong, JIN Si-chao, WANG Jun-sheng
    Geophysical and Geochemical Exploration. 2008, 32 (5): 571-573.  
    Abstract   HTML   PDF (328KB) ( 642 )

    Systematic sampling of soils was conducted in the planning area of Langfang city. N, P, K, Ca, Mg, Fe, Cu, Zn, Mn, B, Mo, Co, Hg, As, Pb, Cl, Cd, F, Se, Cr, I and pH values were analyzed. Soil background values of the area were compared with those of the whole China and the world. Environmental assessment of plough layer soil indicates that the soil quality is better in the northwest part and worse in the southeast part, with Xiwu, Daguanzhang, Zhougezhuang-Pengzhuang and Dazaolin along the Jingshan Railroad being worst. The pollution source is closely related to industry and agriculture, waste gas, waste water and waste solid.

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    NATURAL ANALOGUE RESEARCH OF HIGH LEVEL WASTE DISPOSAL REPOSITORY AND ITS RELATED GEOCHEMICAL ISSUES
    Guo Yong-hai, Wang Ju, Wang Zhi-ming, Liu Shu-fen, Zong Zi-hua, Zhou Jia
    Geophysical and Geochemical Exploration. 2008, 32 (5): 574-577.  
    Abstract   HTML   PDF (329KB) ( 514 )

    The main content of natural analogue research of high level waste disposal repository is introduced in the paper. The major geochemical issues related to the analogue research including solubilities and speciation of radionuclides, migration rate of radionuclides in geosphere, impact factor and retardation of radionuclide migration are described in more detail. Meanwhile, the research results and recognition on the related issues are summarized.

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    THE TECHNIQUES FOR COLLECTING SURFACE WATER AND SURFICIAL GROUNDWATER SAMPLES IN 3D URBAN GEOLOGICAL SURVEY OF SHANGHAI
    Zhang ying-e, Shi Tian-ping
    Geophysical and Geochemical Exploration. 2008, 32 (5): 578-580.  
    Abstract   HTML   PDF (329KB) ( 651 )

    According to the requirements of Standard of multi-purpose Geochemical Survey (1:250000) compiled and promulgated by China Geological Survey in 2006 and in combination with previous workers' experience, the author adopted some practical and feasible techniques for some special scenic spots during the collection of surface water and surficial groundwater samples in 3D urban geological survey of Shanghai.

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