摘要
上海地区经钻孔揭示的基底变质地层,即金山群中斜长角闪岩类经全岩Sm-Nd等时线法测定其年龄为1364±113Ma,ε_(Nd)(t)为1.5±1.9。而从中分选出的角闪石的们^(40)Ar-^(39)Ar体系则反映了后期多次热事件的叠加。上述测定结果反映了本区在中元古代的地壳增长及显生代期间多期改造的复杂地质演化过程。
A Sm-Nd whole rock isochron of the Pl-amphibolites collected from the drill holes in Shanghai region yields a well-defined age of 1364±113 Ma with ε_(Nd)(t)= 1.5±1.9. Whereas the Ar-Ar system of two hornblende separates shows a quite complicated plateau age spectrum, which implies multi-stage superimposed thermal events. Both results suggest the midProterozoic crustal growth and the super-multi-stage feature of tectonic/geochemical evolution in the region.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第4期418-421,共4页
Acta Petrologica Sinica
基金
国家自然科学基金
关键词
角闪岩
同位素地质学
年龄
测定
Jinshan Group
Sm-Nd dating
Ar-Ar dating
Mid-Proterozoic
