摘要
本文阐述了该区玄武质火山岩及其中包体的微量元素及同位素地球化学特征,并对玄武岩浆成因与演化进行了探讨。玄武岩与其中的包体具有不同的过渡金属元素分配型式。二辉橄榄岩包体具亏损地幔岩性质。玄武岩稀土元素的配分特点与世界上典型的大陆裂谷型玄武岩相似。锶、铅、氧同位素的初步研究结果对岩浆的幔源性质及所经受的同化混染作用提供了一些线索。
This paper deals with the element and isotope geochemical feature of the basaltic volcanic rocks and its inclosures in southwestern Hunan. The origin and evolution of the basaltic magma are discussed. The basalt and its inclosure have different transition-metal distribution patterns, of which the lherzolite inclosure bears the character of depleted pyrolite. The REE bistribution pattern of the basalt is similar to that of the typical continental rift basalt in the world. The preliminary results of strontium. lead and oxygen isotope studies has provided some clues to the mantle origin of the magma and to the assimilation and hybridization it undergoes.
出处
《湖南地质》
1989年第3期33-38,共6页
Hunan Geology
关键词
玄武岩
火山岩
地球化学
Basalt
Anatectic inclosure
Depleted pyrolite
Partial melting
Assimilation and hybridization
