Petrology and geochemistry of Ash Shafa plutonic rocks

Abstract EN

Ash Shafa area is underlain by metamorphic rock s con sisting of amphibo lite schi st.

quart zo-fcldsparhic gneiss a nd marble .

These mct arnorph ic rocks were later invaded by different typ es of plutonic rock s including gabbro-dio rite .

tonalite-quartz diorite and gneissic granite-granite.

Ch emical data indic at e that Ash Shafa plutonic rocks have a calc-alkaline affinity .

Th e gabbro -d ior ite-q uart z diorite-tonalite were formed in an ensimatic island- arc , whereas the granites were formed by continental colli sion-rel ated magmatism .