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  • Table of Content
      24 October 1986, Volume 10 Issue 5 Previous Issue    Next Issue
    For Selected: View Abstracts Toggle Thumbnails
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    CHARACTERISTICS ANALYSIS OF GEOPHYSICS IN THE QINGHAI-XIZANG (TIBET) PLATEAU
    Yang Hua
    Geophysical and Geochemical Exploration. 1986, 10 (5): 321-331.  
    Abstract   HTML   PDF (680KB) ( 948 )

    Regional aeromagnetic survey, regional gravity reconnaissance and observa tion and analysis of modern seismic activities all indicate that the Qinghai-Xizang plateau is a quite peculiar and young structural unit of great size. It is characterized by thin magnetic crust, lenticular crustal structure and block as well as mosaic structures. Intense thermal flow and seismic activities, strongly decaying geomagnetic fields and isostatic gravity anomalies large in area reveal that at present the Qinghai-Xizang plateau is still in the process of temperature -rising, upwarping and napping.Low-velocity and low-resistance layers aer ubiquitous within the crust of the Qinghai-Xizang Plateau, and there develop crust-mantle mixed layers beneath the crust. These layers divide the crust into two types of structures with different characteristics. The upper crust is noted for dislocation, superimposition, napping and thickening, while the lenticular layer has been formed in the lower crust as a result of the addition of and mixing with large quantities of materials from upper mantle and asthenosphere. The isostatic state of the lithosphere is wrecked by compression, napping and superimposition of the crust, whereas the development of the crust-mantle mixed layer serves as compensation and adju stment for the nonisostatic state of the crust and the mantle.On account of the high temperature and high pressure environment preva iling at the depth of the crust as well as the transformation and rosorption of the paleostructural and paleolithofacies features, the geophysical characteristics observed today represent mainly the recently-developed and the remaining structural features.The Qinghai-Xizang plateau attributes its formation to the collision and suturation of two continental plates different in evolutionary history. Aeroma-gnetic survey and other geophysicel survey suggest that the combination belt between the two large plates seems along the Jinsha River-Hong River fracture zone and, somewhat to the south of it, the Tanggula-Sanjiang structural zone. The two sides of these zones are evidently different in background of regional magnetic fields.

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    A METHOD FOR EVALUATING AND RANKING REGIONAL GEOCHEMICAL ANOMALIES DELINEATED FROM THE FORMER DATA:A DISCUSSITON
    Luo Sufei
    Geophysical and Geochemical Exploration. 1986, 10 (5): 332-342.  
    Abstract   HTML   PDF (838KB) ( 764 )

    The evaluation, classification and ranking of the anomalies delineated from the former regional geochemical prospecting data and geochemical data of meta llogenic province (belt) seem to be a pressing job. Following the line of thought of Xie Xuejin and Shao Yue for anomaly evaluation, the author has advanced a new method for the ranking of anomalies. Its process goes like this: first, vari ous geochemical parameters of the anomalies are evaluated; then the anomalies are arranged in decreasing order of normalized areal productivity (NAP) values, and the expression of multi-element association for each anomaly is worked out; based on such factors as regional geochemical charactersitics, regional geological and metallogenic regularities, ore-forming material sources, ore-governing geologi cal conditions, and regularity of anomalies in known ore districts, combined with the characteristics of anomalies, the evaluation is made for all the anomalies with the ore types predicted for promising anomalies; the anomalies are classi fied according to the results of anomaly evaluation; finally, the additive NAPvalues of the metallogenic elements and the frent elements in each anomaly ofvarious groups are taken as reference values for the ranking of anomalies, and these values are arranged in order. In this way, anomalies of the same type deposits can be compared with each other.During1981 and 1982, evaluation, classification, and ranking were conducted for 132 anomalies delineated from the former regional geochemical data of Hunan Province, which turned out to be quite encouraging. It is noticed after ranking that the anomalies of the known large-and medium-size deposits are all concentrated in the forefront part of every group, suggesting that the anomalies in the forefront part are of the greatest prospect in ore-searching, and that the anomalies falling in the front but seemingly connected with no ore deposits are likely to be promising in ore prospecting. Moreover, this sort of sequence proves to be consistent with the conclusion drawn from evalution of anomalies. The evaluation results of seven anomalies are found to be in conformity with the newly-obtained reserve data. In1983 and 1984, economic orebodies were discovered through drilling in two anomalous areas, implying that this method for evaluating and ranking anomalies is effective.

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    THE EFFECTIVENESS OF SEVERAL STREAM SEDIMENT ORE-PROSPECTING METHODS IN THE DONGZHONGDA ICE-WATER ACCUMULATION AREA
    Li Hongxiang
    Geophysical and Geochemical Exploration. 1986, 10 (5): 343-349.  
    Abstract   HTML   PDF (494KB) ( 551 )

    The present paper makes a systematic analysis of several stream sedimentore-prospecting methods and analytic techniques for samples in the Dongzhongdaice-Water accumulation area, and, as a result, the information concerning the effectiveness of the most important metallogenic element-copper-in ore prosp ecting of this area is obtained; the heavy mineral survey gives extremely good result; the effectiveness of stream sediment survey depends on the adopted ana lytic techniques for samples; cold extraction method is also exceptionally effe ctive, especially when the grain sizes of the samples after sieving are less than100 mesh; the total extraction methods such as spectral analysis and heating dissolution and colorimetry are of no results, as is also the grey heavy mineral survey.

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    THE UTILIZATION OF CONJUGATE POINT METHOD TO INTERPRET THE REFRACTION HODOGRAPH AND ITS CALCULATION PROCEDURE
    Chen Zikang
    Geophysical and Geochemical Exploration. 1986, 10 (5): 350-355.  
    Abstract   HTML   PDF (396KB) ( 585 )

    This paper describes in detail the technique and advantages of using the conjugate point method to interpret the refraction hodograph. The automatic drawing of refraction profile is accomplished with a microcomputer. The author has adopted the optimum seeking method to evaluate conjugate points, which not only speeds up the calculation, but attains the required calculation precision as well.

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    AN APPRAISAL OF APPLYING NEW TYPES OF ULTRASONIC DETECTOR TO SEISMIC MODEL
    Yuan Yiquan
    Geophysical and Geochemical Exploration. 1986, 10 (5): 356-362.  
    Abstract   HTML   PDF (1560KB) ( 490 )

    The present paper makes a detailed deseription of two new types of energy-transducing material, i. e., the piezoelectric film PVDBtype and the compositepiezoelectric ceramic silicon-rubber PZT-SRM type, and the detectors made ofthem. It also gives a deep appraisal of the role and function of tbese two newtypes of detectors in seismic physical medel test.

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    ALIGNMENT CHART INTERPRETATION OF DIP-ANGLE METHOD FOR THIN-PLANK CONDUCTOR
    Yang Chuangeng
    Geophysical and Geochemical Exploration. 1986, 10 (5): 363-370.  
    Abstract   HTML   PDF (514KB) ( 477 )

    The dip-angle method is a widely-used surface electromagnetic technique developed quite long ago. Using electromagnetic response formula for semi-infi nite thin-plank conductor and adopting proper parameters, the author has calculated and drawn interpretation alignment charts for two major devices in the dip-angle method and evaluated buried depth and dip angle of the thin-plank conductor. This technique is applicable approximately to circumstances of finite conductivity.

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    SOME OPINIONS ON REGIONAL ELECTRICAL SURVEY
    Deng Zuyan
    Geophysical and Geochemical Exploration. 1986, 10 (5): 371-378.  
    Abstract   HTML   PDF (661KB) ( 609 )

    This paper begins with an analysis of the necessity of regional electricalsurvey, holding that this method might bring about another drastic developmentof geophysical prospecting. Then it discusses the feasibility of regional electricalsurvey, indicating that valieties of electrical procpecting techniques are all dire-cted at the same target, and thus the idea "every variety has its own meritsand demerits, and therefore better one should be adopted" hinders us from con-ducting regional electrical survey. Analysis and comparison have also been madefor various techniques and facilities widely used at present. On such a basis, it isbelieved that the amplitude-frequency IPtechnique with dipole device is themost effective means for regional electrical survey. In addition, some opinionsconcerinng the performance of regional electrical survey, such as fund and org-anization, are also given in this paper.

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    THE DISCOVERY OF PEAR-LITE RESOURCES WITH THE AID OF AEROMAGN-ETIC ANOMALIES
    Liu Hongsong
    Geophysical and Geochemical Exploration. 1986, 10 (5): 379-381.  
    Abstract   HTML   PDF (266KB) ( 470 )
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    RECALCULATION DIAGRAM FOR TERRAIN CORRECTION IN GRAVITY SURVEY(FROM 166.7km TO THE WHOLE GLOBE)
    Liu Liyan, Liu Dinghe
    Geophysical and Geochemical Exploration. 1986, 10 (5): 381-383.  
    Abstract   HTML   PDF (187KB) ( 874 )
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    TWO METHODS FOR SOLVING INTERSECTING DRAWINGS IN COMPLEX AREAS
    Feng Anjian
    Geophysical and Geochemical Exploration. 1986, 10 (5): 384-390.  
    Abstract   HTML   PDF (405KB) ( 314 )
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    INTERPRETATION OF TIME INTERVAL CURVES OF RE-FRACTION WAVE BY REC-URSIVE METHOD
    Luo Xun, Zhu Jieshou
    Geophysical and Geochemical Exploration. 1986, 10 (5): 391-393.  
    Abstract   HTML   PDF (179KB) ( 971 )
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    THE ORE-PROSPECTING EFFECTIVENESS OF LiF(Mg,Cu, P) HEAT-RELEASED RAY DETECTOR OVER URANIUM MINERALIZATION OCCURRE-NCES
    Zhao Youqing
    Geophysical and Geochemical Exploration. 1986, 10 (5): 394-397.  
    Abstract   HTML   PDF (327KB) ( 422 )
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    THE CAPABILITY OF THE DIPOLE DEVICE FOR FEFLE-CTING IP ANOMALIES
    Chen Gen
    Geophysical and Geochemical Exploration. 1986, 10 (5): 398-400.  
    Abstract   HTML   PDF (239KB) ( 527 )
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    THE CALCULATION OF HALF LIFE TIME WITH SECONDARY ELECTRIC POTENTIAL DISCH-ARGE CURVES
    Xia Zhiping
    Geophysical and Geochemical Exploration. 1986, 10 (5): 400-401.  
    Abstract   HTML   PDF (145KB) ( 363 )
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