Cordierite,An Index Minerel In Granulite Terrains

Category Petrology
Group GSI.IR
Location 20th symposium on geosciences
Holding Date 16 April 2008

     The Microprobe Analyses Of the cordierite in Peraluminous restites From Kolah- Chazi Granitic roks in South of Isfahan displays that it is relating
Highe In Which is charactaistic of Partially molten rocks At Very Low Pressure Inaddition, the cordierite varies composition the and members
Mg2AL3 (Si5AL)O18,Fe2(Si5AL) with in the range Of 0.523 to 0.528 on the base of minera logical and
geochemical studies it is very possible that during Jurassic Period, the oregenal metapelitis in kolah — Ghazi basin understand progressive Regional metamorphism terminating in granulite facies metamorphism Followd by incongruent melting.
The meltey began by the break down of biotite releasing water And k - Feldspar For The Melt. The Ferromagnesian Phases Which formed at or near the climax of metamorphism , including garnet and cordierite occure as residual of phases .
with in the paraluminous restite.

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