Metallogenic ages of tungsten-tin polymetallic deposits in Lianping area,northern Guangdong Province

Quartz veins constitute the main metallogenic type of tungsten-tin polymetallic deposits in Lianping area,northern Guangdong Province.In this study,40Ar-39Ar dating of mica from tungsten-tin bearing quartz veins in the Jubankeng ore deposit yielded a plateau age of(139.2 ±1.5)Ma with an isochron age of(143.6 ± 3.9)Ma(MSWD =0.30),and Rb-Sr dating of fluid inclusions in quartz from the Jitishi tungsten deposit produced an isochron age of(155.4 ±5.1)Ma(MSWD=2.1).These results show that there exist two metallogenic epochs in Lianping area:one is Early Yangshanian,during which the Jitishi tungten deposit was formed and the gigantic diagenetic and metallogenic peak of Nanling region occurred,and the other is the transitional period from Early to Late Yangshanian,during which the Jubankeng tungsten-tin polymetallic deposit was formed.These data provide important geochronologic constraints for regional metallogenic regularity research and mineral exploration in this region.