摘要
中条山落家河花岗闪长岩铷-锶等时线年龄为1795+/-84Ma,^(87)Sr/^(86)Sr初始比为0.708+/-0.0073。铅同位素等时线年龄为2572+/-30Ma。这些数据表明该岩体是中条裂谷闭合阶段的产物,在成因上与太古界基底岩系在A-型俯冲过程中发生部分熔融有关。
A Rb-Sr isochron age of 1795+/-84 Ma with initial ^(87)Sr /^(86)Sr ratio of 0.708 +/-0.0073 and a lead isotope age of 2572+/-30 Ma are obtained for the Luojiahe granodiorite in the Zhongtiaoshan district, suggesting that this intrusion were produced during the closure of the Zhongtiaoshan continental rift and could be related genetically to the partial melting of igneous materials in the Archean basement as a result of A—type subduction.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
1993年第4期651-657,共7页
Journal of Nanjing University（Natural Science）
关键词
花岗闪长岩
同位素年龄
铅同位素
granodiorite
isotope age
continental rift
Zhongtiaoshan
