摘要
汉诺坝玄武岩是由碱性玄武岩和拉斑玄武岩组成的一套共生的岩石组合。前者既有富钾的类型也有富钠的类型，后者几乎全为富钠的类型。两种玄武岩在球粒陨石标准化模式图上有明显富集轻稀土的特征，且均有正的Eu异常，但二者在(La/Yb)N比值和Eu／Eu^*都有明显区别。它们是地幔岩石不同程度部分熔融的产物。
The Hannuoba basalts are a suite of associated rocks consisting of alkali basaltsl and tholeiites. The alkali basalts can be divided into K-rich type and Na-rich type, while the tho-leiites are almost of Na-rich type. These two types of basalt are characterized as being obvi-ously rich in light rare earth elements as is shown in the chondrite-normalized REE patterns, exhibiting positive Eu anomalies. However, significant differences in (La/Yb)N and Eu/Eu* ratios are noticed between these two types of basalt. They seem to be products of varying-de-gree partial melting of the mantle rocks.
出处
《地球化学》
CAS
1987年第4期351-359,共9页
Geochimica
