摘要
本文通过研究Th、Nb、Zr的地球化学性质和判别机理,根据世界上典型大地构造环境区玄武岩类的Th、Nb、Zr数据,研究了Th、Nb、Zr判别玄武岩大地构造环境的地球化学机理,发现不同构造环境区玄武岩系的Th、Nb、Zr特征具有显著差异,其比值特征能将玄武岩形成的大地构造位置很好地划分出来;提出了判别玄武岩大地构造环境的Nb/Zr—Th/Zr双对数判别图,该图能较好地区分出大洋板块发散边缘、板块汇聚边缘、大洋板内、大陆板内及地幔热柱形成的玄武岩;得出了玄武岩大地构造环境判别的标志;指出了用Th、Nb、Zr判别玄武岩大地构造环境的方法。
Based on the Th, Nb and Zr data of basalts formed in the typical tectonic settings of the world, we studied the principle of the geochemical discrimination of tectonic settings of basalts. The basalts of different tectonic settings are obviously different in the terms of Th, Nb and Zr. The types of tectonic settings are classified using the ratios between Th, Nb and Zr. A Th/Zr-Nb/Zr diagram is proposed to divide basalts of a series of tectonic settings, such as the margin of divergent oceanic plates, margin of convergent plates, oceanic plate interior, continental plate interior, and mantle plume.
出处
《地质论评》
CAS
CSCD
北大核心
2003年第1期40-47,共8页
Geological Review
基金
国家攀登计划(编号A30-09B)
四川省地学核技术重点实验室开放基金(编号HD-01)
