摘要
赛马和紫金山岩体分属不同的碱性岩系列,同具轻稀土富集,无Eu异常特征。赛马较紫金山岩体稀土含量和轻稀土富集程度为高,而且出现了稀土的独立矿物。两个岩体的稀土演化规律也各异。八个稀土元素所作Q型聚类分析得到了较好的分类效果。成因模式计算结果表明,形成两个岩体的碱性岩浆主要是石榴二辉橄榄岩,具有不同的石榴石/单斜辉石比例和稀土浓度,是经过低程度部分熔融产生的。
The Saima and Zhijingshan rock bodies, belonging to different alkaline series, exhibit the same chondrite-normalized REE pattern, i.e., LREE-enrichment and no Eu anomaly. The contents and LREE/HREE ratios of the Saima rock body are higher than those of Zhijingshan with REE independent minerals presented only in the former. There the main rock-forming elements have an important role to play in controlling the REE geochemical behavior in the rocks. In the establishment of partial melting models garnet lherzolite differing in garnet/clinopyroxene ratio and REE content (Co), is used as source material together with F = 0.5%. The calculated results show that the models can effectively simulate the genesis of the rock bodies studied.
出处
《地球化学》
CAS
CSCD
北大核心
1991年第3期229-235,共7页
Geochimica
基金
国家自然科学基金
