Theoretical Modelling of Water—Rock δD—δ18O Isotopic Exchange System and Source of

Theoretical Modelling of Water—Rock δD—δ18O

Isotopic Exchange System and Source of OreForming Fluid：A Case Study on Jinduicheng Superlarge—Scale Molybdenum Deposti,Central

China

孙晓明;任启江;等

【期刊名称】《中国地球化学学报：英文版》 【年(卷),期】1998(017)003

【摘要】Based on the theoretical modelling of water-rock δD-δ18 O isotopic exchange process,the evolution and sources of ore-forming fluid in four metallogenic epochs of the Jinduicheng superlarge-scale porphyry-type molybdenum deposit were investigated.It was revealed that in the pre-metallogenic and early-metallogenic epochs,the ore-forming fluid was a residual fluid derived from magmatic water-wall rock interaction at middle to high temperatures(T=250-500℃） and lower W/R ratios(0.1>=W/R>0.001),while in the metallogenic and postmetallogenic epochs,the ore-forming fluid was a residual fluid derived from meteoric water-wall rock interaction at middle to lower temperatures(T=150-310℃

）

and

relatively

high

W/R

ratios(0.5>W/R≥0.1),The meteoric water played an important role in molybdenum mineralization,and at the main metallogenic epoch the W/R ratio reached its maximum value.