摘要
报道和总结了近期陕西汉中碑坝和西乡地区重要地质体系统同位素年代研究成果，在重新厘定的年代学基础上，就扬子克拉通北缘同位素特征及其地质意义进行剖析，依据该区岩浆作用的上地幔源区性质及演化规律，提出了中。
The systematic study of Rb Sr,Sm Nd and single zircon Pb evaporating dating methods, provides a set of Proterozoic date of chronology on the Beiba and Xixiang districts along the northern margin of Yangtze Craton. Further, the Nd isotopic characteristics and their indications about the continental margin magmatism originated from the regional upper mantle composition and the evolution pattern during Precambrian are discussed on the new background. Isotopic evidence shows that oceanic curst subduction and crust mantle recycling process took place along the northern margin of Yangtze Craton during Meso Neoproterozoic .
出处
《地球科学（中国地质大学学报）》
CSCD
北大核心
1996年第3期332-336,共5页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金
地质矿产部"壳幔体系组成
物质交换及动力学"开放研究实验室联合资助
关键词
同位素
地球化学证据
中元古代
新元古代
isotopic evidence
northern margin of Yangtze Craton
Mesoproterozoic
Neoproterozoic
oceanic crust subduction
crust mantle recycling.
