Mineralogical Mapping And Metallogenic Model Of The Guilaizhuang Gold Deposit,Shandong Province

Guilaizhuang gold deposit is located in Pingyi County,Shandong Province,Which is the Luxi mining work a major breakthrough area.In this paper,the minerals and elements of Guilaizhuang gold deposit are selected as the main research objects.Mineralization,petrology and mineralogy are used to study the effects of metal deposits,alteration minerals,mineralization elements,magnetic susceptibility,fluid migration trajectories and metallogenic models.The near-infrared mineral analyzer,portable element analyzer and magnetic susceptibility meter were used to test nearly1079 samples.Using mineralogical mapping,element mapping,magnetic susceptibility mapping to map the alteration of mineral zoning,metal mineral zoning,element vertical zoning;the relationship between the magnetic susceptibility and the gold ore body and the migration law of the ore-forming fluid are found.Based on the previous studies,the metallogenic model of the Tongshi area is established.(1)The mineralization of the cryptoexplosive breccia controlled by F₁is not uniform,and the ore-bearing property of breccia is smaller.Ore body,alteration zone,breccia size are along the NE-SW direction of the trend,suggesting that the ore-forming fluid trajectory along the SW along the fracture structure upward migration.(2)Near the elevation of 0m,the content of As,Hg,Au,Ag and Sb in the low temperature elements reached the maximum value,and downward extension gradually declines,which indicated that the ore body had undergone a certain degree of denudation.(3)Metal minerals are divided into magnetite belt,pyrite belt,gold-telluride-selenide zone,the high grade of gold grade and gold-telluride-selenide bands correspond well and may represent the direction of migration of the fluid.The alteration mineral assemblage is distributed along the upper part of NE in the direction of SW,the silicic acid zone(quartz+sericite)is centered and may be the main channel for fluid migration,outwardly for the muddy zone(illite+montmorillonite+kaolinite)and the green rock(chlorite+borage)combination.The ore-forming fluids of the Guilaizhuang gold mine originate from the SW direction of the mining area,and there are several upwellings along the two channels of the-700m elevation of the 40th exploration line and the-900m elevation of the32th exploration line.Along the rupture of the movement,up to near the surface,by the surrounding rock and early crystallization of the hard shell block,with the continuous accumulation of magma,the internal expansion force gradually increased.When the internal expansion force exceeds the rock of the overburden rock and the tensile strength of the rock,the magma break through the hard shell,the occurrence of the explosive,the formation of breccia type ore body;Part of the fluid along the fissures of the surrounding rock into the carbonate formation,the formation of limestone ore body.