Barsisa Bekele

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Questions related from Barsisa Bekele

Protholith of metamorphic schists and aluminous gneisses?

How we know whether the origin of metamorphic schists and aluminous gneisses is marine sediments or immature continental sediments. What geochemical or petrological evidence is more appropriate?

03 August 2022 3,763 5 View

What does it mean "S-type granites are not associated with more mafic rocks"?

One of the distinct characteristics of S-type granites is that they are not associated with more mafic rocks contrasting to the I-type granites. May anyone explains this?

25 November 2019 3,736 11 View

How rare-element pegmatite is geochemically related to two-mica granite?

Rare-element pegmatites are commonly assumed a fractionation product of magma from which a spatially and temporally related two-mica granite is crystallized. How this assertion is geochemically...

20 November 2019 3,877 2 View

What type of garnet end member is produced by peritectic break down of biotite?

Geochemical data of granite-pegmatite from my present study shows peraluminous, S-type, Low K, magnesian series, Flat REE, with Syn-COLG affinity. Garnet compositions in pelitic/gneiss county...

26 September 2019 4,460 7 View