中国东部新生代玄武岩稀土配分的分形结构因子与其它化学组成的相关性  

A Study of Relationship between Fractal Structure Factor of REE Pattern and Other Chemical Components of Cenozoic Basalts in Eastern China

作　　者：沈步明[1] 周德进[1] 

机构地区：[1]中国科学院地质研究所

出　　处：《岩石学报》1996年第1期99-114,共16页Acta Petrologica Sinica

基　　金：国家自然科学基金

摘　　要：本文提出了稀土配分分形结构因子概念和计算方法。利用这个新方法，计算了中国东部新生代玄武岩中稀土配分的分形结构因子。研究了这些因子与玄武岩主元素、稀土元素、分散元素和同位素之间的关系，并求出了其相关性参数。利用这些参数，求出了两个端元玄武岩的主元素和稀土元素含量；提出了五大莲池地区玄武岩可能与富钾交代地幔部分熔融作用有关，其它玄武岩的形成与软流圈地幔或岩石圈地幔部分熔融有关；玄武岩同位素的比值不仅受玄武岩浆地幔源区本身的特征制约，还可能受地幔岩部分熔融程度的制约。A new method for fractal structure factor (FSF) of REE pattern is suggested in the paper. The FSF values of REE pattern in Cenozoic basalts in eastern China are calculated, the relationship between these FSF values and major elemens, rare-earth elemens, and isotopes are studied, and relative parameters are obtained. The contents of major elements and rare-earth elements for both members of basalt are calculated from these parameters. It is suggested that the Wudalienci basalt may be related to partial melting of K2O-rich metasomatic mantle and other basalts to partial melting of asthenospheric mantle or lithospheric mantle. The isotopic ratios in the basalt are restricted not only by the characteristics of the mantle providing primary magma of basalt,but also by partial melting degree of the mantle.

关 键 词：玄武岩 稀土族 分形结构因子 化学成分 

分 类 号：P588.145[天文地球—岩石学]