Abstract:

The new data of metal logenicepochs,the zoning of the mine ralization ,fluid inclusions and deep mining outcrops in the Jinqingding gold deposit have been reviewed comprehensively.Through the detailed observation,a group of fluid metallogenic structural evidence has been confirmed.In combination with the distribution character istics of metallogenic elements, mineral associations,fluid inclusions with their trapping temperatures, pressures and compositions at different elevations,the paper proposes the new localizing mechanism of ore-forming fluids in the deposit.The ore-forming fluids with medium-high temperatures mainly originated from the magma.The deposit was the product of secondary crypto explosion, boiling,rapid dropping of pressure and temperature of un solidified relict fluids which derived from the primary ore-forming fluids of medium-high temperature and high pressure at one epoch which invaded,localized at the depth and formed the solidified crust after the first dropping of temperature and pressure.It seems that gold mineralization happened in two stages o f flu id - host rock interaction:( 1)dominant gold crystallization and solidification in the depth after the dropping of temperatures and pressures;( 2) gold and multiple metal crystallization and solidification at shallow parts after the cryto explosion. Consequently, the Jinqingding deposit possess the zoning features of metallogeny. The new know ledge o f ore body zoning metallogeny helps to direct regional mineralization regularity studies and deep prospecting work in the district.

Key words: Jinqingd ing gold deposit, metallogenic fluid, spatial localization