摘要
对滇西三江地区新生代碱性火山岩进行了火山学、岩石学、岩石化学、稀土元素和痕量元素特征以及同位素特征的系统研究 ,发现该区新生代碱性火山岩有同源性 ,是同一种岩浆分异演化的产物。是富水富集地幔岩部分熔融形成碱性超基性 基性 中性岩浆 ,以及钙碱性辉石岩、单辉橄榄岩组成的岩浆岩片或楔形体 ,构成壳幔过渡层。当走滑断裂的反复活动 ,该壳幔过渡层之岩浆上侵或喷发到地表 ,形成各种类型的火山岩。
The Cenozoic alkali volcanic rocks in the Three River area of West Yunnan have been systematically studies in volcanology, petrography, petrochemistry, characteristics of REE, trace elements and isotopes, which are cogenetic, resulted from the differentiation and evolution of same magma. The mantle source rock rich in water, by partial melting, formed the alkali ultrabasic basic intermediate magma and magmatic rock slice or wedge of calc alkali pyroxenolite and monoclinic pyroxen peridotite, forming the transitional layer between mantle and crust. In the repeated strike slip faulting, the magma in this trasitional layer erupted to the surface and formed various volcanic rocks.
出处
《云南地质》
2000年第2期152-170,共19页
Yunnan Geology
基金
云南省与中国科学院合作项目!(96S0 0 7)
