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  • Table of Content
      24 December 1984, Volume 8 Issue 6 Previous Issue    Next Issue
    For Selected: View Abstracts Toggle Thumbnails
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    HELIUM SURVEY-ITS APPLICAION TO GEOLOGICALMAPPING AND ENERGY EXPLORATION
    Jiang Yongyi, Liu Qingyu, Li Jiajun, Dai Zhongqing, Yang Zhiping
    Geophysical and Geochemical Exploration. 1984, 8 (6): 321-331.  
    Abstract   HTML   PDF (806KB) ( 536 )

    Helium, a nonradioactive and chemically inert gaseous element, is generated from radioactive decay of U238, U235 and Th232 series. Its stability and high permeability enable it to migrate farther away than Rn222 and form helium halos above and near the sources. Fracture zones and faults, which provide favourable conditions for helium migration, are positions where anomalous helium content is expected to be recorded. Helium survey, therefore, can be used both for geological mapping and for uranium exploration.Since 1970s, the research work on helium method in China has gained rapid advances. Amobile helium mass-spectrometer (Model HE-602)with helium sensitivity higher than10 ppb and measuring precision ±2-3% was developed by Beijing Uranium Geology Research Institute (BUGRI) in1978. All sampling techniques applied are now available, and all samples (soil gas, water and soil) collected in such a way have proed to be of good representativeness.The data acquired in the past few years at 17 uranium deposits and their neighbouring areas demonstrate the existence of helium anomalies over both uranium orebodies and tectonic faults controlling uranium mineralization. Some promising areas defined by helium anomalies have turned out to be really enriched in uranium. Furthermore, helium survey can also find application in earthquake prediction and geothermal prospecting.

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    NEW GEOCHEMICAL INDICATORS USED INGEOTHERMAL EXPLORATION
    Zhu Bing-qiu, Zhang Jin-mao, Zhu Li-xin, Zhai Jun-xiao, Zheng Ya-xin
    Geophysical and Geochemical Exploration. 1984, 8 (6): 332-340.  
    Abstract   HTML   PDF (434KB) ( 745 )

    Acase history used in geothermal geochemical exploration in Teng Chong Area, Yunnan Province, China, is presented. Soil samples were collected at the sampling density of two per square kilometer, As, Sb, Bi and Bcontents in soils. as the geothermal new indicators were studied to contract with Hg. The distinct anomalies of Hg, As, Sb and Bi in soils were discovered over geothermal fields. The outlines of the anomalies fairly accord with one another. Banomaly indicates the stracture features of the geothermal fields. Relationships among these elements are investigeted in terms of correlation analysis, regression analysis and geochemical nature of the elements. This method may serve as a-rapid and efficient approach in regional geothermal reconnaissance.

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    A GEOCHEMICAL STUDY OF THE SANDAOCHA GOLDDEPOSIT AT JIAPOGOU:CHARACTERISTICS OF ITSPRIMARY HALOS AND THE MODEL OFITS GEOCHMMICAL ANOMALIES
    Zhu Taitian
    Geophysical and Geochemical Exploration. 1984, 8 (6): 341-351.  
    Abstract   HTML   PDF (809KB) ( 486 )

    Primary halo studies have been conducted at a worked gold mining area which is badly in want of expansion of reserves. The distribution of the elements was made clear by means of factor analysis and point group analysis, and ore potentiality was predicted for anomalies around deep-seated portion of the orebody and at the surface. Characteristics of primary halos display apparent zoning of elements:Fand Hg are concentrated at the top of the orebody, serving as distant indicator elements; Ag and Pb are mostly observed at upper part; low value zones of Cu, Ni, and Voccur at the middle; Au and factor loading anomalies are distributed around the orebody. The vertical zona-tion of elements was established with the help of zonality indexes; the existence of a hidden orebody and its probable depth of burial was forecasted on thebasis of the distribution of Hg halos and residual anomalies-Hg tends toincrease at 300 m level of the main ore vein (ore vein No. 3). The surface anomaly (NO. 55-1), whose association with an orebody had failed to be verified by previous drilling, was reexamined by the primary halo method, and the element association of the anomalies defined implies the existence of a hidden orebody.

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    THE APPLICATION OF THE HIGH-ALTITUDENORMAL GEOMAGNETIC FIELD TO AEROMAGNETICMAP COMPILATION
    Fu Aoyun
    Geophysical and Geochemical Exploration. 1984, 8 (6): 352-361.  
    Abstract   HTML   PDF (672KB) ( 900 )

    This paper presents the encouraging result obtained in the first application of the high-altitude normal geomagnetic field calculated from aeromagnetic data to aeromagnetic map compilation for the alpine region. The test by available data has demonstrated that the high-altitude normal geomagnetic field calculated from aeromagnetic data has precision higher than that of the surface normal geomagnetic field. In compiling ATanomalous maps, the utilization of high-altitude normal geomagnetic field correction remarkably improves the variation of the regional magnetic fields and the manifestation of the local magnetic anomalies.Based on a comparison between the high-altitude and the surface normal geomagnetic fields, the author argues that annual variation and difference in height between calculation sites are major factors responsible for the differences between two sorts of normal geomagnetic fields. He also summarizes the means as well as some experience gained for applying normal geomagnetic fields of diverse ages in extensive aeromagnetic map compilation, and proposes a scheme for establishing the nationwide normal geomagnetic field by means of surveyed aeromagnetic values.

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    THE HYDROLOGICAL WELL-LOGGINGINTERPRETATION MODEL
    Tan Tingdong
    Geophysical and Geochemical Exploration. 1984, 8 (6): 362-371.  
    Abstract   HTML   PDF (579KB) ( 802 )

    The concept of the hydrological well-logging interpretation model, a new model serving as a basis for interpretation equations, formation evalution procedures and their geological applications, has been dealt with in this paper. The application of this model to the estimation of parameters of ground water volume is also tentatively introduced.

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    THE APPLICATION OF GEOCHEMICAL DATA INELECTRICAL EXPLORATION FOR METALLIC ORE DEPOSITS
    Wang Yiwei
    Geophysical and Geochemical Exploration. 1984, 8 (6): 372-378.  
    Abstract   HTML   PDF (475KB) ( 439 )

    Electrical and geochemical methods have long been proved to be two important approaches in prospecting for metallic deposits. Considering the presence of both electrical (electromagnetic) fields and geochemical anomalies around the same ore bodies, integrated application of these two methods is expected to enhance the reliability of their interpretation. Inference can be made on the possible mineralization of the source in the light of existence or nonexistence of ore-related geochemical anomalies. Geochemical data can help to identify electrical anomalies caused by such disturbing factors as man-made conductors, topography, water-bearing faults, graphite or pyrite. However, a main problem in the utilization of geochemical information is none other than distinguishing false geochemical anomalies from ore-related ones. The geochemical anomalies related to mafic-ultramafic rocks or geological bodies with high background content can be recognized in terms of their geochemical characteristics.

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