摘要
本文研究了赣东南变质基底的Ｎｄ模式年龄（ＴＤＭ＝１３６０－２１２４Ｍａ，平均为１７５５Ｍａ），结合变质岩的Ｒｂ－Ｓｒ，Ｓｍ－Ｎｄ等时线年龄确认赣中地区存在前寒武纪地壳基底，推测本区还有一个尚未出露的古元古－新太古代的花岗质陆壳。
In this paper,the Nd model ages of the meta basement in central Jiangxi have been studied.The values of T Dm range from 1360 to 2124 Ma with an average of 1755 Ma.Precambrian crustal basement in this region has been determined according to Rb Sr isochron ages of 719 726 Ma and Sm Nd wholerock isochron ages of 1113 Ma.It is inferred that there is a paleoproterozoic neoarchean continental crust in Central Jiangxi which is not exposed,and this continental crust could be the Proterozoic provenance region.
出处
《铀矿地质》
CAS
CSCD
1999年第3期137-141,共5页
Uranium Geology
基金
核工业核能资源研究开放实验室研究基金
关键词
陆壳形成时间
赣中变质基底
钕模式年龄
地壳
Nd model age, Formation age of crust, Meta basement in Southeastern Jiangxi Province
