摘要
Through Re-Os isotopic studies of world-class ore deposits,the authors have found that the apparent Re-Os ages sometimes are consistent with or close to the mineralization age,but sometimes are inconsistent or even fail to be obtained. On the basis of these models,massive ores of mafic-ultramafic rock associated Cu-Ni sulfide deposits would yield geologically meaningful Re-Os age while pseudo-isochron would often be obtained for disseminated ores. Disseminated ores usually yield geologically meaningful initial Os isotopic ratio,whereas massive ores would yield geologically meaningless apparent initial 187Os/188Os ratio, except for a few cases.