摘要
采用统计方法对20组世界各地大陆下地壳组成的估计值进行分析,其结果表明大陆下地壳组成具双峰式分布特征,峰值代表了A、B两种端元组分。组分A为幔源垫托岩浆的结晶分凝产物,组分B为古老的大陆壳物质。大陆下地壳物质组成和同位素成分确定和探讨对建立恰当大陆动力学模型具有深远的指示意义。
Statistical analysis on 20 groups of estimated data of the lower continental crust all over the world shows that its major elemental compositions, named components A and B, are characterized by a bimodal distribution. Component A is fractionally crystallized outcrops of underplating mantle-derived basaltic magmas, while component B is the pre-existing continental material. The determination of the major elemental and isotopic compositions of the lower continental crust has highly indicative significance on the modelling of continental dynamics.
出处
《地质科技情报》
CAS
CSCD
北大核心
1996年第1期45-49,共5页
Geological Science and Technology Information
基金
国家自然科学基金(49252001)
中国科学院院长基金资助项目
关键词
大陆下地壳
物质组成
同位素组成
大陆动力学
双峰式分布特征
lower continental crust
major elemental compositions
isotopic compositions
continental dynamics
