青海可可西里新生代火山岩特征  

THE CHARACTERISTICS OF KEKEXILI CENOZOIC VOLCANIC ROCKS

作　　者：马文峰[1] 王国芝[1] 

机构地区：[1]成都理工大学地球科学学院,四川成都610059

出　　处：《云南地质》2013年第4期476-479,共4页Yunnan Geology

摘　　要：可可西里火山岩岩石序列为粗安岩、粗面岩、玻基安山岩及流纹岩,尤以安山岩最有代表性。渐新世SiO2、CaO高于中新世。稀土元素分配曲线揭示渐新世和中新世为同源岩浆。同位素研究结果显示出混然富集地幔源区特点。Kekexili volcanic rock series are composed of trachyandesite, trachite, basis andesite and li- parite, especially the characteristic andesite. SiO2, CaO of Oligocene are higher than than those of Miocene. The REE distribution curve shows Oligoeene and Miocene magmas have a same origin. The isotope analysis shows the characteristics of contamination and enrichment mantle derivation.

关 键 词：新生代火山岩 安山岩最典型 同源岩浆 富集地幔源区 青海可可西里 

分 类 号：P597[天文地球—地球化学]