Application of high-frequency magnetotelluric method in porphyry copper deposit exploration: a case study of Duobaoshan deposit area |
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| Authors: | LIU Caihua QU Xin FENG Xuan TIAN You LIU Yang QIAO Hanqing WANG Shiyu |
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| Institution: | College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China |
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| Abstract: | The Duobaoshan mine area in Heilongjiang is located in the northeast section of Xingmeng orogenic belt and is in the west side of Hegang Mountain-Heihe fault zone .There exist many deposits in this area , and its metallogenic conditions are superior , which has been one of the hotspots in geological prospecting and metal -logenic research in Northeast China .On the basis of previous studies , the authors used the EH-4 electromagnet-ic imaging system to carry out the data acquisition of three survey lines in Woduhe Village , Duobaoshan Town , Nenjiang County .Through the analysis of apparent resistivity section under TE and TM polarization modes , in-tegrating regional geological data , it is concluded that:①the electrical characteristics of the metal ore in this area show a relatively low resistance , and according to its resistivity difference with surrounding rocks , the geo-metrical structures and apparent resistivity parameters of the low resistivity bodies in the lower section of the sur -vey line are defined , and the electrical anomalies can be identified;②faults F1 and F2 may have a good metal-logenic environment , so they are recommended for further exploration;③low resistance metal ore bodies have good correlation with local small structures or faults , which may play an iconic role for the delineation of key target areas;④in the process of using apparent resistivity to define the geometric structures of ore bodies un -derground , comprehensive analysis integrating the advantages of TE and TM models should be carry out to achieve more reliable inversion results . |
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| Keywords: | magnetotelluric Sounding ( MT) apparent resistivity Xing'an Mongolia orogenic belt porphyry copper deposit Duobaoshan ore concentration area |
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