. The three major compositional groups for igneous rocks are mafic, intermediate
ID: 802514 • Letter: #
Question
. The three major compositional groups for igneous rocks are mafic, intermediate and felsic. Name the major phaneritic and aphanitic member of each group. As composition goes from mafic toward felsic what happens to the silicate content, the iron and magnesium content, the melt temperature, the linking between silicon-oxygen tetrahedra, . The three major compositional groups for igneous rocks are mafic, intermediate and felsic. Name the major phaneritic and aphanitic member of each group. As composition goes from mafic toward felsic what happens to the silicate content, the iron and magnesium content, the melt temperature, the linking between silicon-oxygen tetrahedra,Explanation / Answer
Phaneritic in mafic: Gabbro
Aphanitic in mafic : Basalt
Phaneritic in Intermediate: diorite
Aphanitic Intermediate: andesite
Phaneric in felsic :Granite
Aphanetic in felsic : Rhyolite
As composition goes from mafic toward felsic
silicate content will be increase
Mg, fe will be decrease
Melting temperature will be decreases.
The linking between silica-oxygen tetrahedral will be increase.
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