Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
권호 표지

MT surveys near Century Zinc Mine, NW Queensland, Australia

호주 Century 아연 광산에서의 MT 탐사

  • Lee, Tae-Jong (Groundwater and Geothermal Resources Devision, Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Seong-Kon (Groundwater and Geothermal Resources Devision, Korea Institute of Geoscience and Mineral Resources) ;
  • Song, Yoon-Ho (Groundwater and Geothermal Resources Devision, Korea Institute of Geoscience and Mineral Resources) ;
  • Cull, James (Monash University)
  • 이태종 (한국지질자원연구원 지하수지열연구부) ;
  • 이성곤 (한국지질자원연구원 지하수지열연구부) ;
  • 송윤호 (한국지질자원연구원 지하수지열연구부) ;
  • Published : 2007.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

Two-dimensional (2D) MT surveys near the Century mine in Australia have been performed with very far remote reference in Esashi, Japan (RR_ESS) as well as Gregory Downs (RR_GREG), which are roughly 6,400 km and 80 km apart from the survey area, respectively. Good quality of MT data could be obtained by remote reference processing with RR_GREG, while the coherency of magnetic fields between field sites and RR_ESS was not sufficient to be used as remote data. Both 2D and 3D inversion of 2D profile data represented the general geological structure beneath the survey area. The main target of the survey, Termite Range Fault, appeared as a boundary between a conductive block to the north and a resistive block to the south in the reconstructed resistivity section, and is inclined slightly to the north-east direction.

호주 Century 광산 주변에서 2차원 MT 탐사를 수행하였다. 현장으로부터 약 80 km 떨어진 Gregory Downs(RR_GREG)에 원거리 기준점을 설치, 운영하고 이 자료를 이용하여 양질의 탐사자료의 획득이 가능하였다. 이와 동시에 현장으로부터 약 6,400 km 떨어진 일본 Esashi (RR_ESS)에서 측정된 수평 자기장 자료를 이용하여 원거리 기준 자료처리를 수행한 결과 자기장의 coherency가 낮아 원거리 기준점 자료로 사용하기에는 적합하지 않았다. Century 광산의 주변에서 수행된 측선 탐사자료의 2차원 및 3차원 역산 결과 연구지역의 전반적인 심부 지질구조를 잘 나타내었으며, 탐사의 주된 목표인 Termite Range Fault는 측선의 북쪽에 나타나는 저비저항층과 남쪽에 나타나는 고비저항층의 경계면을 이루면서 북동쪽으로 약간 경사진 것으로 해석되었다.

Keywords

References

  1. Andrews, S. J., 1998, Stratigraphy and Depositional Setting of the Upper McNamarra Group, Lawn Hill region, northwest Queensland, Economic Geology, 93, 1132-1152 https://doi.org/10.2113/gsecongeo.93.8.1132
  2. Broadbent, G. C., and Waltho, A. E., 1998, Century zinc-leadsilver deposit. In: Geology of Australia and Papua New Guinean Mineral Deposits, Eds: D. A. Berkman and D. H. Mackenzie. Australasian Institute of Mining and Metallurgy, Melbourne, 729-736
  3. Feltrin, L., and Oliver, N. H. S., 2004, Evidence of multi-stage ore genesis at the Century zinc deposit, Northwestern Queensland, Australia, predictive mineral discovery CRC conference, 49-52
  4. Ord, A., Hobbs, B. E., Zhang, Y., Broadbent, G. C., Brown, M., Willetts, G., Sorjonen-Ward, P., Walshe, J. L., and Zhao, C., 2002, Geodynamic modeling of the Century deposit, Mt Isa Province, Queensland, Aust. J. of Earth Sci., 49, 1011-1039 https://doi.org/10.1046/j.1440-0952.2002.00968.x
  5. Sasaki, Y., 2004, Three-dimensional inversion of static-shifted magnetotelluric data, Earth Planet and Space, 56, 239-248 https://doi.org/10.1186/BF03353406
  6. Thomas, G., Stolz, E. M., and Mutton, A. J., 1992, Geophysics of the Century zinc-lead-silver deposit, northwest Queensland, Explor. Geophys., 23, 361-366 https://doi.org/10.1071/EG992361
  7. Uchida, T., 1993, Smooth 2-D inversion for magnetotelluric data based on statistical criterion ABIC, J. Geomag. Geoelectr., 45, 841-898 https://doi.org/10.5636/jgg.45.841
  8. Yumoto, K., Osaki, H., Fukao, K., Shiokawa, K., Tanaka, Y., Solovyev, S. I., Krymskii, G., Vershinin, E. F., Osinin, V. F., and $210^{\circ}$ Magnetic Meridian Chain Stations, 1994, Correlation of high- and low-latitude Pi2 magnetic pulsations observed at 210o Magnetic Meridian Chain Stations, J. Geomag. Geoelectr., 46, 925-935 https://doi.org/10.5636/jgg.46.925