Halab-Mianaj metamorphic area is part of Takab Precambrian metamorphic complex
that exposed in north-west of Iran. Halab-Mianaj cross section included a group of
metamorphic rocks that have been metamorphosed in the greenschist and amphibolite
facies. Garnet porphyro More
Halab-Mianaj metamorphic area is part of Takab Precambrian metamorphic complex
that exposed in north-west of Iran. Halab-Mianaj cross section included a group of
metamorphic rocks that have been metamorphosed in the greenschist and amphibolite
facies. Garnet porphyroblasts chemical composition in garnet schist rocks is in almandine
range. Amphibole composition in Amphibole schist and meta-diorite rocks are calcic
and are changed from actinolite to magnesio hornblende. Chemical compositions of the
Plagioclase crystals are between albite to oligoclase range.
The maximum temperature for garnet schist rocks based on Grt-Bt thermometer
determined 552°C that indicates epidote-amphibolite facies. Temperature and pressure
metamorphic in the amphibole schist and meta-diorite based on amph-plag thermobarometer
determined about 420 - 487°C and 3.9 - 6.7 K-bar that shows the beginning
amphibolite facies. Therefore, the geothermal gradient bases on Halab-Mianaj metamorphic
rocks with different protolith approximately are 30 ± 1° C/km.
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