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  • Table of Content
      24 April 1984, Volume 8 Issue 2 Previous Issue    Next Issue
    For Selected: View Abstracts Toggle Thumbnails
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    THE TECHNIQUES FOR MULTI-ELEMENT DETERMINATIONOF SAMPLES FROM 1:50,000 GEOCHEMICALSURVEY AND THE CONTROL OF QUALITY
    Yang Silin
    Geophysical and Geochemical Exploration. 1984, 8 (2): 65-74.  
    Abstract   HTML   PDF (622KB) ( 358 )

    Semiquantitative spectrographic analysis with "sample-spraying technique" has been conventionally used for years in the 1:50,000 geochemical survey. Its main defects in operation, however, appear to be the low sensitivity in determination of a number of elements, the poor accuracy and its systematic error. While keeping tc the main approach of "sample-spraying" the author has incorporated vertical-electrode spectrography, colorimetry and atomic absorpt-on spectrometry as required by analysis for different element. More rigorous routine monitoring measures have been adopted in the semiquantita-tive analysis with"sample-spraying" technique. Usefulness of the improved technique is illustrated in this paper with special reference to the re-analyses of the regional geochemical samples taken from both the western Henan and the western Yunnan areas.

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    MEASUREMENT OF ELECTRIC PARAMETERS OFCOAL BY USING A NARROW PULSE
    Li Ronglong
    Geophysical and Geochemical Exploration. 1984, 8 (2): 75-79.  
    Abstract   HTML   PDF (278KB) ( 434 )

    The paper describes the method equipment and results in measuring the electric parameters of coal by a narrow pulse. It is a technique of time domain measurement with a numbr of advantages. Various properties of a matter over a broad frequency band can be measured simultaneously. It can be used for on situ determination of the properties of a material.The results obtained with different methods are basically in agreement and are proved useful in estimating properties of coal.It is observed in the experiment that the high frequency components of a pulse attenuate rapidly in coal, but the frequency components below 40 MHzcan penetrate very thick coal layer.

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    A SPECTROCHEMICAL METHOD FOR THE DETERMINATIONOF ULTRATRACE GOLD AND ITS APPLICATIONIN THE REGIONAL GEOCHEMICAL SURVEY
    Jiang Jianhua, Chen Fanglun, Ma Chongguang
    Geophysical and Geochemical Exploration. 1984, 8 (2): 80-88.  
    Abstract   HTML   PDF (612KB) ( 389 )

    This paper discusses the application of a spectrochemical method proposed by the authors, for the determination of ultratrace gold in regional geochemical reconnaissance including the supervisory control over sample preparation and analytical quality, and the precautions in operation. The absolute sensitivity of the method is 1 ng, sample weight being 10g.The coefficient of variation is 20-27% on determining o.n-n.10ppb of gold. Two thousand samples of various types have been taken for analysis. The 1142 stream sediment samples and 220 rock samples have furnished important information concerning the distribution of gold.

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    A TECHNIQUE FOR APPROXIMATE INVERSION OFTHREE-DIMENSIONAL DENSITY INTERFACE
    Sun Demei, Min Zhi
    Geophysical and Geochemical Exploration. 1984, 8 (2): 89-98.  
    Abstract   HTML   PDF (606KB) ( 735 )

    Based upon an approximate formula of three-dimensional gravity anomalies and by using the successive approaching method, an inversion technique for the computation of density data in regional gravity survey has been obtained. The technique was applied to process gravity data from_the middlelower reaches of the Yantze River, and a map of Moho isobaths of the area was constructed.Acomprison of calculated results with seismic sounding data shows a fairly good agreement. Acomputer program for the technique is being developed for the interpretation of regional gravity data.

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    A DISCUSSION ON THE ACCURACY OF FAR-SECTOR TOPOGRAPHIC CORRECTION INREGIONAL GRAVITY SURVEY
    Li Donghan
    Geophysical and Geochemical Exploration. 1984, 8 (2): 99-104.  
    Abstract   HTML   PDF (405KB) ( 467 )

    The calculation error in far-sector topographic correction of regional gravity data originates mainly from the errors of approximation of digital to natural terrain and the interpolation errors of random grid, and, to a lesser extend, from the errors in position. The reading error and the altitude error, however, can almost be neglected. Adiscussion on ail these errors is given in this paper with special reference to the area of Qinling Mountains.

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    ROLE OF HIGH-POWER INDUCED POLARIZATION INGEOLOGICAL MAPPING AND INDIRECT EXPLORA-TION OVER DAHEISHAN AREA IN JILIN
    Li Shijie
    Geophysical and Geochemical Exploration. 1984, 8 (2): 105-115.  
    Abstract   HTML   PDF (786KB) ( 441 )

    This paper is adapted from the results of 1:25,000 high power IPreconnaissance over Daheishan district, in central Jilin Province. Based on the macroscopic characteristics of the polarization field with special reference to the geological data available, fairly good results were achieved in geological mapping, e. g., in defining fracturel, features and stratigraphical conditions as well as in discriminating strata, and intrusives etc. The general geological picture constructed on IPinformation furnishes a better insight into the ore-controlling geology, helps to locate the favorable areas of mineralization, thus reduceing the target area for prospecting, and, according to the actual geological conditions, sifting out the best anomalies for follow-ups so as to provide prospective areas for further exploration.

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    APPLICATION FOR ELECTRICAL METHODS IN PROSPECTING FOR COAL
    Sun Xueshi
    Geophysical and Geochemical Exploration. 1984, 8 (2): 116-120.  
    Abstract   HTML   PDF (301KB) ( 435 )

    Surface electrical methods have been mainly used in the prospecting for minerals, petroleum, coal field and ground water resources. With the ever expanding demand for coal as energy source, electrical survey data has increasingly become a preferred substitute for the costly drillings in locating and delineating hidden faults within the coal field, so as to minimize water discharge and provide necessary geological information for further developing operations.Special reference is given to the Feng Feng Coal mine in Hebei province where a hidden water-conducting fault with a striking length of 700 meters was accurately located in 1978. The electrical result was proved to be in full agreement with subsequent drillings. Asaving of 10 drillings and about 100,000 Yuan of engineering expenses was achieved.

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    GEOPHYSICS APPLIED TO 1:50,000 SCALEGEOLOGICAL SURVEY
    Cui Linpei
    Geophysical and Geochemical Exploration. 1984, 8 (2): 121-127.  
    Abstract   HTML   PDF (737KB) ( 353 )

    Aprogram of geological survey at a scale of 1:50,000 is to be carried out in vast areas of our country. Aproblem that should be investigated is how to apply geophysical methods to a survey of such kind to obtain the maximum amount of geological information and to improve the quality of geological maps. It should be noted that in the geological survey at a scale of 1:50,000, geophysical methods must be selected according to the local structural and geomorphological features and other conditions. The present paper intends to deal with field techniques with special reference to two kinds of regions with different structural features:one in which the fold structures are either exposed or buried at a shallow depth; the second referring to regions with the fold structures buried at a great depth and with the near-surface formation comparatively gentle. Geological tasks for different stages as well as examples are also introduced. Generally speaking, the geophysical investigations in these two kinds of regions can be divided into two stages, preceding and accompanying-In the last part of the paper, geophysical techniques applicable to geological survey at a scale of 1:50,000 in areas covered by volcanic rocks, are given.

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