Applicability Test of Micro-tremor Detection Technology in Jiaojia Gold Field in Northwestern Jiaodong Ore Concentration Area
In recent years,significant advancements in deep prospecting have been achieved within the three principal gold metallogenic belts of Sanshandao,Jiaojia,and Zhaoping,located in the ore concentration area of the northwestern Jiaodong Peninsula.Notably,the Jiaojia gold field exemplifies a typical fractured altered rock type(Jiaojia type)gold deposit.The confirmed gold resource reserves in this area have surpassed one thousand tons,making it a central focus for geophysical exploration within the Jiaodong gold mining region.Historically,geophysical exploration within the study area predominantly relied on electromagnetic methods,including Controlled Source Audio-frequency Magnetotellurics(CSAMT),Magnetotellurics(MT),and Spectral Induced Polarization(SIP).However,these methods were significantly affected by industrial electromagnetic interference resulting from mining activities.To investigate the deep response characteristics and the appli-cability of geophysical methods to the primary ore-controlling faults in northwestern Jiaodong ore concentration area under conditions of strong industrial electromagnetic interference,this study conducts a micro-motion detection test in the representative ore section of Sizhuang within the Jiaojia gold mine field.This study examines the spatial autocorrelation method through micro-motion detection tests involving multiple circular array transformations and varying radius array transformations.The findings indicate a coupling relationship between the apparent shear wave velocity field characteristics of microtremor detection,and the primary ore fracture.By optimizing test parameters,it is feasible to achieve vertical identification of the Jiaojia fault zone within a 3 000 meter depth interval.It provides a basis for the future micro-motion detection method to carry out related exploration work in northwestern Jiaodong ore concentration area.
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