Abstract: In decrepitation test for quartz,α-β peaks frequently appear when the samples are heated to the temperature of 573℃.Study shows that the α-β peak is produced by the leaking(without decrepitating) of high temperature inclusions whose decrepitating temperature is higher than 573℃,the critical point when α quartz converts into β quartz This form of peak may be used to infer the denuded degree of lodes and decide the origin of deposits in gold ore exploring