摘要
根据巨晶(石榴石、富铝普通辉石、歪长石)及其寄主玄武岩的稀土元素和主元素丰度,从巨晶与岩浆熔体的平衡条件出发,论证了巨晶可从其寄主岩成分的岩浆中或从更为基性的岩浆中晶出。一些巨晶与寄主岩处于平衡范围者,其稀土元素的巨晶/寄主岩之值可视为分配系数。巨晶的结晶分离导致了岩浆的稀土元素演化,一些寄主玄武岩显然是由岩浆经历了巨晶分离后的产物。据寄主岩的稀土元素丰度与晶液分配系数,追溯了岩浆的结晶分离历史。
Based on REE abundances in megacrysts and host basalts and their equilibrium conditions, it has proved that the deposit of megacrysts may have been produced from the magma derived from the host rocks or of more basic composition. REE ratios of megacrysts to host rocks may be taken as partition coefficients when both are in equilibrium with each other. The crystal separation of megacrysts has caused the evolution of REE in the magma. It is obvious that some host basalts are the product of magma evolution after crystal separation. According to REE abundances in the host rocks and the partition coefficients of cryst-liquid, the history of crystal separation of magma can be traced.
出处
《地球化学》
CAS
CSCD
北大核心
1990年第2期97-107,共11页
Geochimica
