Investigation of temperature variations and deformation stages with respect to microstructures and mineral paragenesis in paragneisses of northern Shahrekord

Hashemi, Mahin; Shabanian, Nahid; Davoudian, Alireza; Azizi, Hossein

doi:10.22071/gsj.2018.122468.1432

Document Type : Original Research Paper

Authors

¹ Ph.D. Student, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran

² Assistant Professor, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran

³ Professor, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran

⁴ Professor, Department of Mining, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran

https://doi.org/10.22071/gsj.2018.122468.1432

Abstract

Estimation of temperature- pressure deformation path for metamorphic rocks experiencing a complex deformation history commonly rely on the relationship between successive metamorphic assemblages and different microstructures that remain. However, by changing the temperature-pressure conditions, metamorphic minerals with a microstructure, which are specific to those conditions, can be chemically re-equilibrate. Mylonitic paragneisses around the lake of Zayandehrood Dam, have range low-grade to medium-grade mylonites. According to petrographic and microstructural studies, we define at least three stages of metamorphism and deformation. The first stage metamorphism (the earliest recognizable metamorphic stage) took place during eclogite facies conditions. At this stage, high pressure minerals such as rutile, phengite, garnet and alkali-feldspar formed that enclosed in garnet or feldspar, and or located in matrix. These hosted garnets and feldspars based on the evidence of petrography formed at the amphibolite facies condition. Eventually a retrograde metamorphism took place in the lower green schist facies condition, That's evidence includes the sericitization of some feldspars, the chloritization of some biotite, and the formation of cholorite and quartz in and around some garnets. contemporaneous whit these retrograde processes, there is evidence of a relatively high temperature to low temperature deformation microstructure. The combination of evidences of metamorphism and deformation results is that these rocks have risen from relatively high depths, which during the rising stages undergone the various metamorphism condition, and many deformations have affected on this collection.

Keywords

20.1001.1.10237429.1398.29.114.17.2

Main Subjects

Petrology

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Scientific Quarterly Journal of Geosciences

Investigation of temperature variations and deformation stages with respect to microstructures and mineral paragenesis in paragneisses of northern Shahrekord

References

References

Volume 29, Issue 114 - Serial Number 114
Volume 29, Serial Number 114, Winter 2019
December 2019
Pages 165-174

Investigation of temperature variations and deformation stages with respect to microstructures and mineral paragenesis in paragneisses of northern Shahrekord

References

References

Volume 29, Issue 114 - Serial Number 114Volume 29, Serial Number 114, Winter 2019December 2019Pages 165-174

Volume 29, Issue 114 - Serial Number 114
Volume 29, Serial Number 114, Winter 2019
December 2019
Pages 165-174