摘要
经分析测得的长石铅同位素组成,可能不代表岩浆结晶时的同位素组成。结晶后,长石中微量铅的同位素组成,仍可能受所含微量铀、钍影响而增加放射成因铅。这取决于铀、钍、铅的相对含量和岩浆结晶时间。把长石铅看成是多阶段异常铅,可能有利于更深入地探讨地质问题。
The lead isotopic composition of K-feldspar analysed may not represent that of K-feldspar at the time of magmatic crystallization. After crystallization radioactive lead in the lead isotopic composition of feldspar may increase because rare uranium and thorium are contained in the mineral. It depends on the relative abundances of uranium, thorium and lead in the mineral, and the time of feldspar crystallization. It may be favourable for an in-depth study of geological problems to regard feldspar lead as multistage anomalous lead.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第5期456-459,共4页
Geological Review
