摘要
对浙江省龙泉县八都群斜长角闪岩的同位素测定表明，其Ｓｍ－Ｎｄ内部等时线年龄为５２１．６±３９．８Ｍａ，全岩Ｒｂ－Ｓｒ法年龄为５１５．６±１８．４Ｍａ。两个年龄值完全一致反映了一次重要变质事件的年龄。它们表明加里东构造运动的早期对浙江龙泉地区产生了重要影响。
The age of amphibolite from the Badu Group in Longquan,Zhejiang Province,was determined using the Sm-Nd and Rb-Sr methods.The mineral Sm-Nd isochron derived from the whole rock,amphibole and plagioclase of an amphibolite sample yields an age of 521.6±39.8Ma.The whole-rock Rb-Sr isochron based on five amphibolite samples gives an age of 515.6±18.4Ma.These two ages are consistent with each other,and apparently younger than the expected age of the Precambrian Badu Group.This indicates an important metamorphic event which reset the Rb-Sr and Sm-Nd isotopic system of the rocks.The early Caledonian tectonic movement has exerted significant influence on the studied district.
出处
《地球化学》
CAS
CSCD
北大核心
1994年第C00期25-31,共7页
Geochimica
