Erdaogou gold deposit

located in the south of Jinlin province

China

is an typical example of gold deposits hosted in the Archaean TTG grey gneiss

but it has been referred to greenstone belt type gold deposit for a long time. Detailed fluid inclusions and isotopic studies show that the temperature and pressure of the ore -forming fluids are 310～410℃ and (455～950)×10 5Pa respectively

whose fluid phase

with a salinity varying from 7 21 to 25 1 wt%NaCl

riches in Cl -

Na + and Ca 2+

while the gaseous phase contains reltaive large amount of CO 2 and CH 4; the f O 2 and f H 2S of the fluid are 10 -30 2 ar and 10 -1 6 bar separately;its respective values of δ 18 O H 2O and δ D are 5 902‰～6.864‰ and -85 98‰～-97 07‰

while 13 C ΣC and δ 34 S ΣS are -2 59‰～+0 74‰ and 1 5‰～9 0‰(average 5 5‰)

besides

the ore-forming fluid contains high contents of radiogenic Pb. It′s bellieved that the metallogenetic fluid should be referred to typical magmatic solution and its genesis is related to the Mesozoic to Cenozoic magmatism in this area. Comparative studies show that the ore-forming fluid is quite different from that of typical Archaean greenstone belt type gold deposits.