南岭地区二迭纪、三迭纪花岗岩的时代和有关问题讨论

Based upon the geological data on some geoehronologieally well-defined rock bodies and relative isotopic dates, in conjunction with the probability statistics of 182 isotopic geochronometric values, the author has suggested that in the Nanling Region,the Upper Permian-Lower Triassic boundary should be placed at about 250 m.y. and the Upper Triassic-Lower Jurassic at 190--195 m.y. It is believed that the unreasonable division of the age bounderies is one of the reasons which gives rise to the endless dispute on the problem concerning the age-division of the Nanling granites. Recent work on geochronology of the Nanling Region by means of statistics leads to a better knowledge that the Nanling Triassic granites occur widely whereas the Permian granites are discattered about in Guangdeng, Guangxi, Fujian,Jiangxi and Hunan provinces.