摘要
尝试用稀土分布的分形结构因子(FSF)值对我国碱性花岗岩的稀土组成进行了分类.可将我国碱性花岗岩的稀土分布分形结构因子划分为4种类型:①弱变异型(0.98~0.95);②中变异型(0.95~0.92);③强变异型(0.92~0.89);④超强变异型(0.89~0.86).其中前两种类型可很好地对应重稀土富集型和中稀土亏损型花岗岩, 而后两种类型可对应轻稀土相对富集型和轻稀土特富型花岗岩.利用FSF值对新疆东准噶尔地区三带富碱花岗岩按稀土组成进行了归类.
A new method to classify alkali granites in China by fractal structure factor (FSF) of REE pattern is suggested in this paper. The four types of fractal structure factor (FSF) of REE pattern for Chinese alkali granites are followings: (1) weak variation type; (2) median variation type; (3) strong variation type; (4) very strong variation type. There is much correspondence between type (1) and HREE-rich type granites, type (2) and MREE-scarce type granites, type (3) and LREE relatively rich type, type (4) and LREE very rich type individually. At last, the classification model classifies Alkali-rich granites in east Jungger. Generally there are four types of alkali granites in China: HREE-rich type, MREE-scare type and LREE-rich type. In this paper, a new classificationmethod for alkali granites by fractal structure factor (FSF) of REE pattern is suggested. Based on the classification, totally four types of REE patterns for Chinese alkali granites are identified: (1) weak-variation type, (2) median-variation type, (3) strong-variation type and (4) very-strong-variation type. There are good connections between weak-variation type and HREE-rich type, median-variation type and MREE-scarce type, strong-variation type and LREE-relatively-rich type, and very-strong type and LREE-very-rich type respectively. In accordance with the classification, Alkali-rich granites in east Jungger are sorted as followings: alkali granites in north zone are dominated by MREE-scare type, which are some characteristic of MREE-scare type; In central zone, alkali granites show a tendency from LREE-rich type to MREE-scare type; while in south zone, typical HREE-type alkali granites are predominant.
出处
《新疆地质》
CAS
CSCD
2001年第3期180-184,共5页
Xinjiang Geology
基金
国家305项目(969150206)资助
