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《Chinese Journal of Sinica》 1964-02
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INDUCED POLARIZATION SOUNDING, A USEFUL METHOD FOR THE DETERMINATION OF BURIED DEPTH OF ORE-BODIES

TSANG SAI-CHEN  
In determining the buried depth of mineral ore-bodies, the Induced polarization sounding (I.p.s.) seems more preferable to the conventional resistivity method. In view of the absence of systematic nomograms so far, and of the inability of making them under certain complicated conditions, it is discussed and analyzed in this paper the various possibilities of estimating the buried depth of ore-bodies according to the shape and characteristics of the sounding curves, on the basis of model experiment curves, theoretical curves and experimental curves from mining areas. Emphasis is laid on the relations between L. and H. (l and L correspond respectively to the 1/2 AB distance of the breaking point of the curve, and that of the point (η_k-η_1)/(η_(max)-η_1)=0.9, η_(max) here being the value for saturation. H is the depth to the top of the ore body.) various conditions are given, Ⅰ. For plane ground surface 1. slab-shaped ore body l■H, L=5-6H Roughly, these relations are independent of the volume of the ore body, its dip, and of the relative position of AB to the strike of the ore body. 2. Two-layered cross section l=1.3-1.5H, L■5-7H 3. Spherical ore body For H=0.5a-2a (a being the radius of the sphere), l■0.75H-1.5H, L■4.5H-gH For H=a, l■H, L■6H-8H Actually, the ore bodies are slab-like, so the following may often be applied, i.e. l■H, L=5-6H Ⅱ. For rough topography 1. When the AB direction is perpendicular to the topographic strike and 1) Ore-body lying beneath a symmetric triangular mountain ridge: H≒2~2.2 (1+tanθ)/(2+tanθ)l 2) Ore-body lying beneath a symmetric triangular valley: H≒0.72l 3) Ore-body lying beneath the terrace-rim: H■2~2.2(l/1+(3/tanθ+(4+tan~2θ)~(1/2))) 4) Ore-body lying beneath the terrace-bend: H■l The above mentioned relations are to be further proved and corrected by laboratory studies. 2. When the sounding line is along a topographic contour, l■H is observed without any terrain condition. It is therefore proposed to lay the line along the contour, and the interpretation will be greatly simplified.
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【References】
Chinese Journal Full-text Database 1 Hits
1 ZHANG SAI-ZHEN(Institute of Geophysics,Academia Sinica,Beijing 100101)WANG QIN-YI(Beijing Institute of Geology for Mineral Resources, CNNC, Beijing 100012)LUO YAN-ZHONG(China University of Geosciences, Wuhan 430074);AN OVERVIEW ON THE DEVELOPMENT OF THE ELECTRICAL PROSPECTING METHOD IN CHINA[J];Chinese Journal of Geophysics;1994-S1
【Co-references】
Chinese Journal Full-text Database 10 Hits
1 Tian Xianmo;Huang Lanzhen;Cun Shucang;THE BOUNDARY ELEMENT METHOD OF THE 3-D TOPOGRAPHIC CORRECTION FOR THE RESISTIVITY METHOD IN THE POINT SOURCE FIELD[J];;1986-03
2 GE WEI-ZHONG(Yunnan Provincial Metallurgical Bureau);TOPOGRAPHIC CORRECTION FOR THE DC APPARENT RESISTIVITY METHOD OF ELECTRICAL PROSPECTING[J];Chinese Journal of Sinica;1977-04
3 Fu LIANG-KUI;SOME THEORETICAL PROBLEMS IN THE APPLICATION OF MAGNETIC INDUCED POLARIZATION METHOD IN GEOPHYSICAL PROSPECTING[J];Chinese Journal of Sinica;1979-02
4 Fu Liang-kui;SOME RESULTS OF RESEARCH OF THE HORIZONTAL CYLINDER IN THE MAGNETIC INDUCED POLARIZATION METHOD[J];Chinese Journal of Geophysics;1980-02
5 Piao Hua-rong Sha Shu-qin Wang Yan-liang (Changchun Geological Institute);TIME DOMAIN ELECTROMAGNETIC RESPONSE ABOVE THE SURFACE OF A HOMOGENEOUS EARTH[J];Chinese Journal of Geophysics;1980-02
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9 XU SHI-ZHE (Shandong College of Oceanology);A NUMERICAL METHOD FOR SOLVING ELECTRIC FIELD OF POINT SOURCE ON A LAYERED MODEL WITH LINEAR CHANGE OF CONDUCTIVITY IN EACH LAYER[J];Chinese Journal of Geophysics;1986-01
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【Secondary References】
Chinese Journal Full-text Database 10 Hits
1 WEI Wen bo (China University of Geosciences, Beijing 100083, China);New Advance and Prospect of Magnetotelluric Sounding (MT) in China[J];Progress In Geophysics;2002-02
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3 DI Qingyun,AN Zhiguo,FU Changmin,LI Diquan,CHENG Hui (Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China);CSAMT EXPLORATION OVER ROCK DEEP GEOLOGY STRUCTURE FOR PRESELECTED SITE IN BEI-SHAN OF GANSU PROVINCE[A];[C];2010
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