The application of wide field electromagnetic method to deep exploration in Jiaoxibei (northwest Shandong) gold concentration area
WANG Hong-Jun1,2(), XIONG Yu-Xin3
1.Shandong Geophysical and Geochemical Exploration Institute, Jinan 250013, China 2.Shandong Geological Exploration Engineering Technology Research Center, Jinan 250013, China 3.Shandong Geological Science Research Institute, Jinan 250013, China
Jiaojia and Sanshandao fault zones are famous gold ore-forming zones in Jiaoxibei region. In recent years, the deep exploration results are remarkable. At present, the borehole has reached the depth of 4 006 m. The previous geophysical exploration methods have poor deep exploration effect, so effective deep exploration geophysical technology is urgently needed. The wide field electromagnetic method is applied to the known section of Jiaojia and Sanshandao fault zones. The section reveals that the characteristics of the low resistance zone formed by the two major fault zones are obvious, which truly reflects the distribution of underground electricity; the distribution of apparent resistivity high resistance and low resistance reflects the distribution of Linglong granite body and metamorphic rock mass; meanwhile, the section clearly shows the intersection of the two major faults at a depth of 4 km. The section provides the basis for the fault characteristics between Sanshandao and Jiaojia faults. The application test shows that the wide area electromagnetic method has a large detection depth and strong anti-interference capability, and hence it is a good non-seismic geophysical method for detecting the low resistance fault zone in the magmatic rock distribution area of Jiaoxibei region.
王洪军, 熊玉新. 广域电磁法在胶西北金矿集中区深部探测中的应用研究[J]. 物探与化探, 2020, 44(5): 1039-1047.
WANG Hong-Jun, XIONG Yu-Xin. The application of wide field electromagnetic method to deep exploration in Jiaoxibei (northwest Shandong) gold concentration area. Geophysical and Geochemical Exploration, 2020, 44(5): 1039-1047.
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