摘要
在20×10~9Pa和25×10~9Pa条件下,对石榴石橄榄岩进行的14次高温高压熔融实验研究表明,在1600℃时石榴石橄榄岩开始熔融(初熔),熔体中的SiO_2>70％,Na_2O+K_2O>8％,类似于A型花岗岩成分。本实验为地幔花岗岩的成因提供了证据。
The melting experimental study of garnet peridotite under 20×109Pa and 25 ×109Pa indicates that the starting melting temperture of garnet peridotite is 1600℃ The experimental temperture rose step by step from 1200℃ to 1600℃ No fused mass appeared when the temperturc was below 1600℃ The SiO2>70% and Na2O + K2O>8% in the fused mass of starting melt, which is similar to the composition of A-type granite. This experiment provided powerful evidence about the genesis of the mantle granite
关键词
石榴石橄榄岩
熔融
实验
花岗岩
garnet peridotite
high tempetture and high pressure melting experiment
granite genesis
