The Re-Os isotopic dating of molybdenite from the Shimensi tungsten-copper polymetallic deposit in the northern Jiangxi and its geological significance
In order to explore the tungsten enrichment mechanism and metallogenesis of the Shimensi tungsten-copper polymetallic deposit in the northern Jiangxi,in this study,we have carried out the Re-Os isotopic dating of molybdenites of the deposit.The results show that six molybdenite samples have model ages varying from 140.2 Ma to 142.5 Ma,with a weighted mean age of(141.37±0.84)Ma(MSWD=0.84)and an isochron age of(141.79±0.97)Ma(MSWD=1.10),which are consistent within the standard deviation range and can be used to represent the mineralization age of molybdenite.Thus,the mineralization age of this deposit is about 141 Ma.On the basis of the above,we have made further comparison of diagenetic and metallogenic ages of tungsten polymetallic deposits in the northern,central and southern Jiangxi,and found that the diagenetic and metallogenic events in the three regions have continuity in time.Combined with the regional tectonic evolution history,we have suggested that the Shimensi tungsten-copper polymetallic ore deposit was formed in an extensional and thinning environment during the Early Cretaceous.
Shimensi tungsten-copper polymetallic depositRe-Os isotopesmetallogenic agethe northern,central and southern Jiangxi
NETL
NSTL
万方数据
维普
