2019 Vol. 46, No. 4
Article Contents

ZHANG Kun, LÜ Qingtian, YAN Jiayong, ZHAO Jinhua. 2019. The three-dimensional electrical characteristics of the typical iron and copper deposits in the Lujiang-Zongyang ore concentration area[J]. Geology in China, 46(4): 807-817. doi: 10.12029/gc20190411
Citation: ZHANG Kun, LÜ Qingtian, YAN Jiayong, ZHAO Jinhua. 2019. The three-dimensional electrical characteristics of the typical iron and copper deposits in the Lujiang-Zongyang ore concentration area[J]. Geology in China, 46(4): 807-817. doi: 10.12029/gc20190411

The three-dimensional electrical characteristics of the typical iron and copper deposits in the Lujiang-Zongyang ore concentration area

    Fund Project: Supported jointly by National Key Research and Development Program (No. 2016YFC0600201), China Geological Survey project (No. DD20160082, No. DD20190012)
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  • Author Bio: ZHANG Kun, male, born in 1983, doctor, associate researcher, majors in geophysics, deep exploration of the earth; E-mail:zhangkun1010@163.com
  • Corresponding author: YAN Jiayong, male, born in 1976, doctor, senior engineer, majors in geophysics, deep exploration of the earth; E-mail:yanjy1010@163.com 
  • The porphyrite iron and porphyry copper ore deposits are the major deposit categories in the Lujiang-Zongyang ore concentration area. However, previous researches were mostly focused on mineralogy, petrology, geochronology and geochemistry, but paid less attention to geophysics. As the exploration depth is increasing, geophysical methods become more important. In order to develop the interpretation 'scaleplate' of the geophysical exploration for typical deposits, the authors took the Nihe iron and Shaxi copper ore deposits as the research subjects, and obtained the three-dimensional electrical models of the orebodies and the surrounding rocks through the audio-magnetotelluric sounding. The results indicate that the major structure of the porphyrite (Nihe) iron deposit is composed of several layers including low resistivity sedimentary rocks, high resistivity volcanic rocks, relatively low resistivity alteration zone and relatively high resistivity intrusive of subvolcanic rocks from shallow place to the depth. In addition, the magnetite body, which exists as a dome on the top of the mass, presents the characteristics of high resistivity. For the porphyry (Shaxi) copper deposit, the major electrical characteristics are the massive (or longitudinal belt) structures composed of the shallow sedimentary rocks with low resistivity, the deep sedimentary rocks with relatively high resistivity, and the porphyry mass with high resistivity. In addition, the orebodies, which exist in the mass or the contact zone between the mass and surrounding rocks, present electrical characteristics of medium resistivity. The orebodies hosted in the mass (or in the contact zone with surrounding rocks) present medium-resistivity. For the practicability of the models, the authors converted the inversion results with complex electrical structures into two facilitate models, which would be used as the comparative 'scaleplate' for the discovery of the similar deposits.

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