Application of Geodetic Microtremor Sounding and Time-Domain IP Sounding to the Exploration of the Dongwan Gold Deposit in Songxian County,Henan Province
The Dongwan gold deposit in Songxian County,Henan Province is tectonic altered rock type deposit controlled by steeply dipping faulted structural belt.The nearly NE-trending fault F1 is the main ore-bearing(ore-controlling)structure in this deposit,and there is still a possibility of large-scale mineralization in the deep fault F1.Traditional geophysical prospecting method has played a great guiding role in the prospecting and exploration of the middle and shallow parts of this deposit,but it is difficult to adapt to the current demand for deep exploration.The conventional large depth and high resolution electromagnetic detection method is restricted by the strong electromagnetic interference and complex human factors in the mining area.In order to improve the detection accuracy and depth,and to understand the extension of the fault F1 in the deep and the location of the high-polarization body,this work conducted joint exploration of geodetic microtremor sounding without electromagnetic background interference,large detection depth and high resolution,and high-power time-domain IP sounding that can provide information on deep gold mineralization and alteration.According to the obtained apparent S-wave velocity(Vx),apparent resistivity(ρs)and apparent polarizability(ηs)anomalies,combined with the prior information of known geological profiles,the different lithologic and stratigraphic interfaces were effectively identified,and the vertical spatial distribution characteristics of the ore-bearing(ore-controlling)structure F1 were inferred.It is considered that the medium-low velocity,medium-low resistance and high polarization areas along the F1 structural belt are favorable for prospecting.Based on this,the deep prospecting target areas were delineated,which provide a good geophysical basis for deep prospecting and exploration in the deposit.The research methods and results have certain guiding significance for the deep exploration of the Dongwan gold deposit and similar surrounding mining areas.
geodetic microtremor soundinghigh power time-domain IP soundingore-bearing fault structuredeep ore prospectingDongwan gold depositSongxian CountyHenan Province
万方数据
