Reported in this paper are K-Ar dates of volcanic rocks, biotite-granite and greisen from Lianhuashan tungsten ore deposit in Guangdong Province. Isotopic dilution method is adopted in this work. The whole-rock isochron ages of volcanic rocks are within the range of 120.4±12.1m.y. The petrogenetie age of biotlte-granite and the minerogenetic age of the tungsten ore deposit are close to those of the volcanic rocks. The apparent ages of various types of rocks in the mining district generally bias towards younger values, which may be attributed to the effects of late thermal events which took place in the eircum-Paeific mctallogenetic belt.
