摘要
本文系统总结了稀有金属花岗岩的稀土元素四分组效应的特点,根据大量分析数据和实验地球化学资料,指出花岗岩的稀土元素四分组效应在熔体-流体共存体系中形成,花岗质熔体的高程度分离结晶(含稀土副矿物相)和与富挥发分(F、Cl)流体的相互作用是形成稀土四分组效应的重要控制因素。据此,本文提出了稀有金属花岗岩的高程度分离结晶-富挥发分流体交代复合成因模型,进行了模型定量计算,并指出,稀土元素四分组效应可作为识别矿化花岗岩的重要标志之一。
Described in this paper are the characteristics of tetrad effects of REE in raremetal granites. Based on the analytical data and experimentally geochemical data available, it is pointed out that the tetrad effects of REE in the granites are produced in the melt-fluid system. Intense fractional crystallization of granitic melt (containing REE accessories) and its interaction with volatile-rich (F, Cl) fluid are the major factors leading to the tetrad effects of REE. From this, the present paper presents a composite genetic model for high-degree fractional crystallization-volatile-rich fluid metasomatism of rare-metal granites. With the model, quantitative calculations have been made. Meanwhile, it is pointed out that the tetrad effects of REE can be used as an important indicator to distinguish mineralized granites from barren ones.
出处
《地球化学》
CAS
CSCD
北大核心
1992年第3期221-233,共13页
Geochimica
