Study of geological characteristics and fluid inclusions of Geluqiduishan Pb-Zn Deposit in Inner Mongolia
Geluqiduishan Pb-Zn Deposit is a newly discovered Pb-Zn deposit with great exploration potential in recent years.It is located on the west side of the Derbugan fault section,with mineralization occurring in the strata of the Ergune River Formation,Jiageda Formation,and other formations.The lead-zinc mineralization has a close genetic relation-ship with diorite and diorite porphyry and is controlled by NE faults.The mineralization during the hydrothermal period can be roughly divided into pyrite±galena-quartz stage(Ⅰ),galena,sphalerite±chalcopyrite-quartz stage(Ⅱ),and low sulfide-carbonate stage(Ⅲ).Fluid inclusion studies show that only gas-liquid two-phase inclusions are developed in quartz.The ore-forming fluid is a simple,medium low temperature,low salinity NaCl-H2O hydrothermal system,with early ore-forming fluids composed mainly of magmatic hydrothermal fluids.The peak full homogenization temperatures of the main mineralization stage(Ⅱ)are concentrated in the range of 200℃to 250℃,with an average of 230.2℃,and salinity peaks concentrated in the range of 2%to 6%.The estimated formation depth is between 1.40 km and 2.53 km,with the static hydro-pressure concentrated around 14.00-25.27 MPa.Preliminary comprehensive analysis suggests that the Geluqiduishan Pb-Zn Deposit has a close spatiotemporal relationship with medium acidic shallow intrusive bodies,and the genetic type belongs to the medium temperature hydrothermal vein type.
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