福建省前寒武纪变质岩块体地球化学特征  

Geochemical Characteristics of Precambrian Metamorphite Massif in Fujian Province

作　　者：尤爱珍 

机构地区：[1]福建省地质测绘院,福州350011

出　　处：《福建地质》2007年第3期133-141,共9页Geology of Fujian

摘　　要：利用1∶20万区域化探水系沉积物测量资料,分析福建省前寒武纪变质岩块体的元素组合,对比了各地层小区前寒武纪变质岩地层(岩)组的地球化学特征,并对其时间演化规律进行了探讨。研究表明,表征福建省前寒武纪变质岩地球化学变化的主要元素组合为与岩浆作用有关的铁族元素和稀有、放射性元素。总体上从老到新SiO2/Al2O3比值逐渐升高,铁族元素和K2O含量逐渐降低,发现部分地层(岩)组的地球化学特征较为特殊,为今后该区变质岩研究提供了新的线索。By using the stream sediment survey data of 1∶200000-scale regional geochemical prospecting,the author made an analysis of the element assembly of Precambrian metamorphite massif in Fujian Province,contrasted with geochemical characteristics of Precambrian metamorphite strata or lithofacis in stratigraphic subzones and made a study of regular patterns of time evolution.The geochemical characterization shows that major geochemical assembly of Precambrian metamorphic rocks in Fujian Province is made up of iron-group elements and rare elements and radioactive elements related with magmatism.As a whole it is shown that the ratio of SiO2 and Al2O3 increases gradually from the old to new strata and that the contents of iron-group elements and K2O reduce by degrees.It is considered that the geochemical characteristics of some strata or lithofacies in the surveyed area are particular,which present a new clue for studying metamorphic rocks herein.

关 键 词：前寒武纪 变质岩 块体 地球化学 福建省 

分 类 号：P588.3[天文地球—岩石学]