摘要
本文提供了西华山花岗岩体各类岩石19件样品的稀土元素含量测定数据。由此得出的稀土模式表明,岩体的演化主要经历了岩浆期结晶分异作用和岩浆后期熔体-溶液渗浸改造作用两个阶段。而相应于岩体的结晶、分异和演化,花岗岩中稀土元素含量呈有规律地变化。这一结果和作者所做的实际观察结论及有关其他岩石、矿物及地球化学证据十分一致。
The REE concentrations of 19 whole-rock samples from the stock are presented in this paper. Based on the REE patterns with strong negative Eu anomalies two types of rock samples can be distinguished: magmatic-stage rocks (porphyritic medium-grained biotite granite r52a and inclusions, porphyritic medium-fine-grained bi-otite granite r52c, and porphyritic fine-grained granite) which are characterized by high δ Eu(>0.1) and .∑Ce/∑Y(>1), with the chondrite-normalized patterns showing marked LREE enrichment, and deuteric-stage rocks (medium-grained granite r52b, fine-grained granite, other porphyritic medium-fine-grained biotite granite r52c and inclusions, aplites, and red-feldspathized rocks) which are characterized by low δEu(<0.1) and ∑Ce/∑Y(<1), with the chondrite-normalized patterns showing marked HREE enrichment. Therefore, regular variations are noticed in REE concentration with the evolution (r52a→r52c→ r52b) of the granite, fractional crystallization, assimilation and deuteric infiltration, indicating that the granite was derived mainly from the Earth's crust. All this is in good agreement with geological investigations.
出处
《地球化学》
CAS
CSCD
北大核心
1992年第1期49-54,共6页
Geochimica
