Prediction Of Shaanxi Saddle Bridge Gold Deposits Control Factors And Mineralization

This paper is from the research the controls of the mineral factor of MaAnqiao gold deposit to commence, making use of the structure analysis, fluid inclusion, geochemistry, geophysical etc to become mineral estimate . The mainly result and new views as follows:1.Through the analysis to the formation mechanism of structure and the evolve of shear zone, The first time is thrusting from north to south, which make sure the position of the shear zone. The second time is thrusting from south to north, which make sure the position of gold deposit. The third time is strike-slip about west-east, which make the deposit display right-lateral and left-stepping. The second and the third time is more important to the formation of gold deposit. The fourth time is mainly brittle deformation, which have no use to the formation of gold deposit.2. Through researching the relationship of the deposit spatial distribution and the contact relation with wall rock. Ore-bearing stratohorizon is TongYus group of late Devonian system and ore bearing rock is minute clastic rock formution.3.Through researching the typomorphic characteristics of pyrite and the relation with gold mineralization. The pyrite of researching zone has four time. The second and third time is the main mineralization.4.Through the analytical research of fluid inclusion, the temperature of the fluid is 210℃~260℃.The sality is 7.8-4.5 %o, the depth is about 1~2 km.5. According to geochemical prospecting, there have industrial deposit 30-50 meter below CM33 tendency to South along 17 name. There is a deposit in 1200 meter level of 25 line.6. According to geology, geophysical prospecting and geochemical prospecting, east - of 25 line display right- lateral and left- stepping.The Ore body esists in light grayishsericite ultramylonite, the celadon sericite ultramylonite or flake mylonite, it' s upper bound is carbon phyllite and lower bound is biotite- quartz mylonite.There is a small roe body in 4-10 anomaly of y3 line and II anomaly of 25 line section.