摘要
通过对东天山花岗岩类的岩石学、微量及稀土元素地球化学、同位素地质年代学的综合研究,揭示了该区各类花岗岩的地球化学特征。在该区除了加里东和前寒武纪分布局限的花岗岩类外,花岗岩类主要形成于海西期,同时明确了印支期花岗岩类的存在。根据花岗岩类的地球化学特征,分析了花岗岩类产出的大地构造环境及形成发展历史,说明了花岗岩类具多物质来源的混源成因类型特征及复杂的形成过程。
Comprehensive petrological,trace element and REE geochemical and isotopic geochronolo-gical studies of East Tianshan granitoid rocks,Xinjing have revealed the geochemical characteris-tics of granites of various types in the region studied.In this region the Hercynian granitoidrocks are dominant,with the Caledonian-Precambrian granitoid rocks being of limited distri-bution.Evidence shows that the granitoid rocks were formed mainly during the Hercynianperiod and also indicates the existence of the Indosinian granitoid rocks.On the basis of thegeochemical characteristics of the granitoid rocks an analysis has been made of their geotectonicsettings and evolutionary history,indicating that granitoid rocks are diverse inmaterial sourceand complicated in formation history.
出处
《地球化学》
CAS
CSCD
北大核心
1993年第3期288-302,共15页
Geochimica
