Please, what can explains these high content of silica (range : 66.5-71.0 ) in amphibolites rock samples?

I did geochemical analysis on amphibolites rock samples from my study area, I am surprise to see that the silicate content on my data (range : 66.5-71.0 ) compare to other works (range :...

02 January 2018 4,804 8 View