摘要
安徽女山新生代碧玄岩含有丰富的高压巨晶和幔源包体。地球化学数据和杂质元素资料表明,女山碧玄岩是原生的地幔二辉橄榄岩包体局部熔融的产物。局部熔融作用发生在1.7～2.15GPa和1350℃～1450℃的条件下。熔出碧玄岩熔浆的数量约为5％～10％体积。
The Cenozoic basanites of Nushan in Anhui Province contain abundant high-pressure megacrysts and mantle-derived nodules (Sp-lherzolite, Hb-lherzolite and Ga-lherzolite).
Geochemical parameters and data of trace elements suggested that the Nushan basanites originated from partial melting of primitive mantle-derived lherzolites. The melting occurred on conditions of 1. 7~2. 15GPa and 1350~1450 ℃. The melt fraction was approximately equal to volume 5%~10%.
关键词
高压巨晶
幔源包体
局部熔融程度
High-pressure megacrysts, Mantle-derived nodules, Degree of partial melting
