Protolits of Boneh- Shorou Amphibolites in Gelmandeh massive (Saghand-Central Iran)
Subject Areas :آرش Gorabjiri pour 1 , A.R Hoshmand zadeh 2 , KH KHosro-Tehrani 3 , M.H Emami 4
1 - دانشجوی دکترای پترولوژی – دانشگاه آزاد اسلامی واحد علوم و تحقیقات
2 - عضو هیت علمی دانشگاه آزاد اسلامی واحد زرند کرمان
3 - عضو هیت علمی دانشگاه آزاد اسلامی واحد علوم و تحقیقات
4 - عضو هیت علمی دانشگاه آزاد اسلامی واحد اسلام شهر
Keywords: Saghand, Gelmande massive, Origin, Garnet Amphibolite, Boneh, shorow, Rich mantle,
Abstract :
The Gelmandeh Massive is a low relief high located north-east of Saghand, in Yazd province..From thepoint of view of structural geology, it is part of "Central Iran" the Kalmard_Posht-e-Badam Block, east ofthe Posht-e-Badam Fault.This structural high is composed of a combination of metamorphosed sedimentary rocks, amphibolitesand pink quartzific and feldspatic gneissic. The characteristic of the mica schist is the high percentage ofre-criticized quartz and large, bent muscovite crystal. This unit is seen in close proximity of muscovite ofan amphibolites complex, which is divided in two the fallowing three parts:1) hornblendite with excess of 90% hornblende2) garnet-amphibolites (containing) oligoclase, tschermakite and hastingsite variety of hornblende andlarge, brown garnets of almandine-grossularite type3) Grey banded amphibolitic gneiss with augen texture.Field observations and geochemical studied point to a magmatic protolite for the amphibolites but of twodifferent origins:1) Basaltic with calcalkaline & potasic calcalkaline affinity derived from an enriched mantle2) basaltic with calcalkaline to tholeitic affinity with crustal contamination.Both are of within plate variety, produced by "hot spot affected the crest in two different time
