Earth Science Frontiers ›› 2010, Vol. 17 ›› Issue (4): 280-289.

• Article • Previous Articles     Next Articles

A study of the metallogenic prognosis for the periphery of Jiama copperpolymetallic ore, Tibet based on the RS method.

 GUO  Na, CHEN  Jian-Beng, TANG  Ju-Xin, GUO  Ke   

  1. 1College of Information Engineering, Chengdu  University of Technology, Chengdu 610059, China
    2Institute of Land Resources and High Techniques, China University of Geosciences(Beijing), Beijing 100083, China
    3Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
    4Laboratory of Beijing Land Resources Information Development, China University of Geosciences(Beijing), Beijing 100083, China
    5Key Lab of Geomathematics of Sichuan Province, Chengdu 610059, China
  • Received:2009-07-31 Revised:2010-01-31 Online:2010-07-01 Published:2010-07-01

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Abstract:

After one year prospecting work at Jiama copperpolymetallic ore area, we found that the industrial orebodies spread well into the periphery of Jiama with great prospecting potential. In order to verify whether the peripheral area has mineralized and to provide the foundation for further exploration, we applied the remote sensing technique to the metallogenic prognosis of the ore district and peripheral belt. The ETM+ and image were used to conduct the principal component analysis, ratio analysis, and MNF transformation, and by means of Munsell transformation, the HLS image was built up. Based on the fact that the Fe3+, Si and OH- displayed high brightness reflection during the image deciphering process, we set the threshold value and extracted the remote sensing metallization data. The deciphering results were coincident with the alterations and the lithological characteristics information extracted from deciphering the IKONOS images of mining areas, which demonstrated the correctness of the information extracted from the ETM+ and image and suggested the feasibility of using ETM+ and image to extract the relevant mineralization data in Jiama and its periphery. By introducing ETM+ and image TM6 wave band and combined with 746 false color image, the tectonic information was deciphered. Synthesizing the tectonic, alteration, and geological research results and using GIS method to conduct layering extraction of information and superimposing analysis, we delineated six perspective ore prospecting areas. These areas are mainly located on the surroundings and north of the Jiama mining area, where are the key places for ore prospecting. At present, except the Jiama and Qulong areas, most places of this region have had only low level exploration. However, by extracting various mineralization data both from ETM+ and image, and IKONOS image with high spatial resolution, and  by making their comparison, we confirmed that the delineation of the perspective ore prospecting areas is objective and correct. In addition, this study may guide the practice of areal prospecting in periphery of Jiama and  Gangdese metallogenetic belt.

Key words: remote sensing, IKONOS image, alteration, tectonic information extraction, metallogenic prognosis, Jiama copper polymetallic ore area

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