MINERALOGY, TEXTURE AND RETROGRADE P-T EVOLUTION OF GRANULITES DURING COOLING AND EXHUMATION; NE OF TAKHT-E-SOLEYMAN METAMORPHIC COMPLEX, NW IRAN

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HAJIALIOGHLI R.; MOAZZEN M.

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Journal: GEOSCIENCES Year:2017 | Volume:27 | Issue:105 Page(s): 105-116

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Title

MINERALOGY, TEXTURE AND RETROGRADE P-T EVOLUTION OF GRANULITES DURING COOLING AND EXHUMATION; NE OF TAKHT-E-SOLEYMAN METAMORPHIC COMPLEX, NW IRAN

Author(s)

HAJIALIOGHLI R. | MOAZZEN M. | Issue Writer Certificate

Keywords

KLYPHITIC MARGINQ1

GRANULITESQ2

P-T EVOLUTIONSQ1

RETROGRADE METAMORPHISMQ2

TAKHT-E-SOLEYMANQ1

NW IRANQ2

Abstract

The TAKHT-E-SOLEYMAN metamorphic complex is located at NE of Takab town, West Azerbaijan province. This complex having Precambrian-Cambrian age has been formed from low to high grade metamorphic rock types. The retrograde GRANULITES are subject of this study. The retrograde metamorphic assemblages of the GRANULITES are including Amp+Grt+Spl+Opaque phases. Amphibole highly overprinted primary mafic phases of clinopyroxene and orthopyroxene. Spinel at the klyphitic texture around garnet porphyroblast forms the main feature for RETROGRADE METAMORPHISM of GRANULITES. Rutile occurs as inclusions within amphibole. The compositional profile of garnet indicates chemical variations from the core to the rim. Compositional variations from the core to the middle part is characterized by a minor increase in XMg but decrease in XCa and XMn. This feature of garnet is indicative of decompression with small increase of temperature. Due to complete overprinting of high temperature phases by the retrograde phases as well as lack of preserved pick metamorphic minerals, it is indeterminate to estimate pick metamorphic P-T conditions for M1 stage. On the basis of chemical compositions of porphyroblasts, retrograde evolution of the investigated GRANULITES is considered at two stages: (1) pressure decompression and exhumation (M2-a) and (2) cooling (M2-b). The retrograde P-T conditions are obtained as T=810±10˚C at P=10.5±0.7kbar for the first and the second retrograde stages, respectively. Relatively coarse-grained phases at the KLYPHITIC MARGIN are indicative of low cooling rate during uplifting of rocks from lower to upper levels. Extensive overprinting of high temperature phases by amphiboles supports this idea. Time of pick and RETROGRADE METAMORPHISM for the investigated GRANULITES are not clear accurately. It seems reasonable to attribute pick metamorphic and granulite formation time to Oligocene-Miocene, related to crustal thickening due to collision between the Central Iran micro-continent and the Arabia plate. The GRANULITES are metamorphosed under retrograde conditions in relation to thrusting and post collisional extensions which caused uplifting, crustal thinning and exhumation of the rocks. However correct conclusions on tectonometamorphic evolution need more precise studies.

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APA: Copy

HAJIALIOGHLI, R., & MOAZZEN, M.. (2017). MINERALOGY, TEXTURE AND RETROGRADE P-T EVOLUTION OF GRANULITES DURING COOLING AND EXHUMATION; NE OF TAKHT-E-SOLEYMAN METAMORPHIC COMPLEX, NW IRAN. GEOSCIENCES, 27(105 ), 105-116. SID. https://sid.ir/paper/32278/en

Vancouver: Copy

HAJIALIOGHLI R., MOAZZEN M.. MINERALOGY, TEXTURE AND RETROGRADE P-T EVOLUTION OF GRANULITES DURING COOLING AND EXHUMATION; NE OF TAKHT-E-SOLEYMAN METAMORPHIC COMPLEX, NW IRAN. GEOSCIENCES[Internet]. 2017;27(105 ):105-116. Available from: https://sid.ir/paper/32278/en

IEEE: Copy

R. HAJIALIOGHLI, and M. MOAZZEN, “MINERALOGY, TEXTURE AND RETROGRADE P-T EVOLUTION OF GRANULITES DURING COOLING AND EXHUMATION; NE OF TAKHT-E-SOLEYMAN METAMORPHIC COMPLEX, NW IRAN,” GEOSCIENCES, vol. 27, no. 105 , pp. 105–116, 2017, [Online]. Available: https://sid.ir/paper/32278/en

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