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中生代花岗岩包括三迭纪、侏罗纪和白垩纪三个时代花岗岩,大致对应着所谓印支期、燕山早期和燕山晚期岩浆活动的产物。南岭地区的中生代花岗岩十分发育,有关的金属矿产相当丰富,时代分歧也较大;搞清这些岩石的时代界线,对认识该区的中生代地壳演化史及成矿规律具有重要意义。 张理刚等提出了南岭三迭纪花岗岩的上、下时代界线,但没有讨论侏罗纪和白垩纪花岗岩的时代界线。本文试从同位素地质年龄数据、地质判据等资料讨论南岭中生代花岗岩的时
The Mesozoic granites include three age granitic rocks of the Triassic, Jurassic and Cretaceous periods, roughly corresponding to the so-called Indosinian, Early Yanshanian and late Yanshanian magmatic activities. The Mesozoic granite in the Nanling area is well developed, and the related metallogenic deposits are quite rich and the time differences are also large. Understanding the time boundary of these rocks is of great significance for understanding the Mesozoic crustal evolution history and metallogenic regularity in this area. Zhang Ligang put forward the Nanling Triassic granite upper and lower boundaries of the times, but did not discuss the Jurassic and Cretaceous granite era boundaries. This paper tries to discuss the time of the Nanling Mesozoic granite from isotopic geologic age data and geological criteria