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  • Table of Content
      24 February 1985, Volume 9 Issue 1 Previous Issue    Next Issue
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    A PRELIMINARY DISCUSSION ON SOME PROBLEMSCONCERNING THE REQUIREMENTS IN ELEMENTDETERMINATION FOR SAMPLES FROMREGIONAL GEOCHEMICAL PROSPECTING
    Sun Huanzhen
    Geophysical and Geochemical Exploration. 1985, 9 (1): 1-8.  
    Abstract   HTML   PDF (646KB) ( 374 )

    The requirements in determination of elements for geochemical samples are different with diverse tasks, as demonstrated by the different requirements for regional survey and for reconnaissance. During the reconaissance as well as the detailed investigation stage, the prospecting work is confined to a comparatively small area, the types of ore likely to be found are quite limited or are predictable, and the elements to be analysed are accordingly fewer (about 20) in number. The relatively crowded measuring networks for the reconnaissance are designed mainly to delimit the inner zones of the anomalies which have markedly high contents and contrast values of elements. Therefore element determination in this stage requires less precision and accuracy than that in regional survey stage. In contrast, the regional survey on the scale of 1:200,000 aims at detecting regional geochemical anomalies characterized by low intensities, low contrast values and vast covering areas. Moreover,as a means to acquire basic geochemical data, its working method involves doing geochemical work according to map areas and then constructing a nationwide geochemical map by piecing together the obtained areas maps at a reduced scale. The correlation and peicing together of adjacent map areas demand considerably high sensitivity and accuracy. In regional survey,determination ought to be made for all elements, including the rare elements, that are likely to form independent ore deposits, and for accompanying elements which may serve as indicators. Not only has the regional geochemical prospecting been widely used in mineral exploration, but it provides increasing quantities of valuable geochemical data for such research fields as regional geology, natural xegionalization,environmental protection,and farming, forestry as well as animal husbandry. At present, 39 elements can be analysed, including the major characteristic diagenetic elements. Some preliminary ideas have also been put forward in this paper as to the suitable measures to be adopted for satisfactorily completing the determination of regional geochemical samples under the present conditions of chemical analysis in China.

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    SOME SUPERGENE GEOCHEMICAL CHARACTERISTICS OFTHE HILLY PLATEAU PLANE IN GANZE AREA,SICHUAN PROVINCE
    Li Hongxiang
    Geophysical and Geochemical Exploration. 1985, 9 (1): 9-18.  
    Abstract   HTML   PDF (718KB) ( 450 )

    The results gained in the experimental geochemical work for two metallic ore deposits in the hilly plateau plane of Changtai and a tungsten deposit inKangding are reported in this paper. The super gene geochemical characteristics are dealt with preliminarily, which include the order of element activity inweathering and residual crust of this kind of landscape, the distribution of elements in various media such as oxidized zone of sulfide depositi, eluvial-slope materials and drainage sediments, the weight distribution and allocationof element contents in surficial materials of diverse grain sizes and variation in intensity of chemical weathering.

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    A PRELIMINARY STUDY ON THE EVALUATION OFSUPERGENE GEOCHEMICAL ANOMALIES
    Liang Yinggan
    Geophysical and Geochemical Exploration. 1985, 9 (1): 19-24.  
    Abstract   HTML   PDF (450KB) ( 491 )

    On the basis of the geochemical data obtained from a lead-zine ore deposit and a porphyry copper deposit, combined with the reference material both at home and abroad, this paper discusses the interrelationship between chemical composition of rocks, acid value of soil solutions, oxidation-reduction potential and organic content of soil as well as the influence of these factors on the leaching loss and enrichment of chemical elements. All these data contribute to the adequate interpretation of the intensity of geochemical anomalies, making it possible to evaluate anomalies correctly.

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    THE UTILIZATION OF REMNANT SPHERICAL SHELLMODEL IN THE STUDY OF OUTER CORRECTION FORGRAVITY SURVEY
    Liu Shiyi
    Geophysical and Geochemical Exploration. 1985, 9 (1): 25-32.  
    Abstract   HTML   PDF (549KB) ( 501 )

    Gravitational formulae of two remnant spherical shells are given in this paper and are used in stone slab correction and topographic correction for gravity survey. The results of the correction have been compared with the corresponding values calculated by finite and infinite plane formulae commonly used in the past, which shows that, in using the plane formula to conduct correction, the error resulting from the imperfection of the model can not be neglected in many cases.The variability in sign of the topographic correction values is also dealt with in this paper with the aid of the remnant spherical shell model.In view of the wide utilization of the microcomputer, the author suggests that the remnant spherical model should be used in stone slab correction and topographic correction.

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    THE DIVISION AND CLASSIFICATION OFGEOPHYSICAL ANOMALIES
    Jiang Mei
    Geophysical and Geochemical Exploration. 1985, 9 (1): 33-40.  
    Abstract   HTML   PDF (1393KB) ( 567 )

    The division and classification of geophysical anomalies are frequently required in regional geophysical prospecting to tackle such problems as mapping, tectonic division and ore-predicting. The integrated division and classification by means of image recognition might lead this work to the level of quantitative analysis. The image recognition includes"study" method and "self-study" method, with the former pursuing "study" on known standard object and the latter conducting recognition through "self-study". Nevertheless, either method will provide new interpretations from different aspects.The geophysical work carried out in Chengde-Shenyang, Jiangsu and some-other places is cited in this paper to illustrate the availability of image recognition in the interpretation of regional geophysical data.

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    THE DWJ-1 MICROPROCESSING INDUCEDPOLARIZATION INSTRUMENT
    Xia Zhiping
    Geophysical and Geochemical Exploration. 1985, 9 (1): 41-48.  
    Abstract   HTML   PDF (553KB) ( 942 )

    The DWJ-1 microprocessing induced polarization instrument, an "intelli gent" type device designed by Chinese engineers, was technically approved byexperts organized by Ministry of Geology and Mineral Resources of China and are now being produced in batch by Beijing Geological Instruments Factory.This instrument has much to commend it. It is simple in operation; the polarization compensation and survey selection are not required-the only thing to do is to press the starter button- observation precision is high; the superposition average can be obtained for primary potential and the average value can be extracted for polarizability after automatically giving up the superheterodyne; the self-potential tracking is reasonable; the self-checking program and debugging routine are perfect, so the instrument is easy to be kept in good maintenance.Due to its small volume and light weight, this instrument is suitable for reconnaissance geophysical survey, especially for short traverse line survey and near-source "identical point" survey.

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    THE UTILIZATION OF LOGGING DATA OF COAL BASININ THE STUDY OF DEPOSITIONAL ENVIRONMENTAND COAL-ACCUMULATED ZONE
    Huang Zhihui, Chen Yaocen
    Geophysical and Geochemical Exploration. 1985, 9 (1): 49-58.  
    Abstract   HTML   PDF (732KB) ( 589 )

    This paper presents the results obtained from Aiyu mining area of Fuxin coal basin in utilization of such means as apparent resistivity, natural gamma, and gamma-gamma logs for analysing depositional environment with an emphatic summarization of characteristics of logs of geographic environments including alluvial fans, deltas, lakes and rivers. On such a basis and according to the logs of over 100 drilling holes in this area, the Sand-bearing contour map and isopach of coal beds have been drawn, an analysis of which leads to the discovery of the distribution regularity of coal-accumulated zones and coal-rich zones in this area. These data are of universal significance in coal predicting and exploration.

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    THE EFFECTIVENESS OF APPLYING REGRESSIONANALYSIS TO THE SYLVITE LOGGING INTERPRETATION
    Gan Lai
    Geophysical and Geochemical Exploration. 1985, 9 (1): 59-63.  
    Abstract   HTML   PDF (302KB) ( 511 )

    The present paper deals with the application of regression analysis to the sylvite spectrum logging interpretation for discriminating ores from barren rocks. The study has led to the formulation of a theoretical equation for the investigated area, whose applicability has been verified by practical examples.

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    SOME DATA OBTAINED FROM REDUCED-SCALE SIMULATION WITH VERTICAL CONDUCTIVE PLANE BODY IN M-1 AIRBORNE ELECTROMAGNETIC SYSTEM AND THEIR APPLICABILITY
    Zou Zonglian, Song Yueming
    Geophysical and Geochemical Exploration. 1985, 9 (1): 64-67.  
    Abstract   HTML   PDF (327KB) ( 408 )
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    A SIMPLE AND EASY WAY FOR DETECTING PITCH COAL-ANEW APPLICATION OF SELF-POTENTIAL METHOD
    Hu Jiyuan
    Geophysical and Geochemical Exploration. 1985, 9 (1): 67-69.  
    Abstract   HTML   PDF (242KB) ( 545 )
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    THE DETECTION OF NATIVE FORMICARY BY MEANS OF ELECTRICAL SURVEY
    Guo Wei
    Geophysical and Geochemical Exploration. 1985, 9 (1): 69-70.  
    Abstract   HTML   PDF (165KB) ( 397 )
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    INDICATOR FOR VARIATION OF WATER TABLE IN DRILLING HOLE
    Xiao Lianxi
    Geophysical and Geochemical Exploration. 1985, 9 (1): 70-71.  
    Abstract   HTML   PDF (149KB) ( 388 )
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    HIGH POW ER SUPPLY STATION WITH YELLING FACILITIES
    Ma Jinting
    Geophysical and Geochemical Exploration. 1985, 9 (1): 71-72.  
    Abstract   HTML   PDF (152KB) ( 562 )
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    THE APPLICATION OF RANDOM SAMPLING METHOD IN GEOCHEMICAL SECONDARY HALO PROSPECTING
    Li Jinyao
    Geophysical and Geochemical Exploration. 1985, 9 (1): 72-74.  
    Abstract   HTML   PDF (241KB) ( 624 )
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    DAS8-A NEW INFORMATIONRECORDING SYSTEM
    Ye Dongxin
    Geophysical and Geochemical Exploration. 1985, 9 (1): 74-77.  
    Abstract   HTML   PDF (379KB) ( 314 )
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    THERMOSTATIC GRAVIMETER-SOME SUGGESTIONS FOR ITS UTILIZATION
    Li Mingxiong
    Geophysical and Geochemical Exploration. 1985, 9 (1): 77-79.  
    Abstract   HTML   PDF (250KB) ( 669 )
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