摘要
盛源盆地中的安山岩有斑状安山岩和隐晶质安山岩，沿盆地边缘断续分布。安山岩厚数厘米到百余米，里特曼指数（δ）多在１．８－３．３，少数＞３．３；ＳｉＯ２含量与中国安山岩平均值相近，Ｋ２Ｏ偏高，ＴｉＯ２含量０．８９％，Ｒｂ／Ｓｒ为１．１２８，δＥｕ为１．３３１８，表现出安山岩与上地幔的成因联系。
In Shengyuan basin, andesites with the thickness from several centimeters to over 100 meters are composed of porphyritic and cryptocrystalline andesite, and distributed discretely along the margin of the basin. Rittman index (δ) of the andesites are mainly in the range of 1 8-3.3 (a few, >3.3). With SiO 2 content similar to the average content of andesites in China, higher content of K 2O, TiO 2=0.91%, Rb/Sr=1.128, δ Eu =1.3318, the andesites in Shengyuan basin show genetic relationship to upper mantle.
出处
《铀矿地质》
CAS
CSCD
1999年第1期35-38,共4页
Uranium Geology
