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

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HASHEMI M.; SHABANIAN N.; DAVOUDIAN A.R.; AZIZI H.

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Journal: GEOSCIENCES Year:2020 | Volume:29 | Issue:114 Page(s): 165-174

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Title

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

Author(s)

HASHEMI M. | SHABANIAN N. | DAVOUDIAN A.R. | AZIZI H. | Issue Writer Certificate

Keywords

Temperature variationsQ1

MicrostructureQ2

Mineral paragenesisQ2

ParagneissesQ1

North ShahrekordQ1

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 reequilibrate. 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 and graphite formed that enclosed in garnet or feldspar. 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 greenschist facies condition, That’ s evidence includes the sericitization of some feldspars, the choloritization of some biotite, and the formation of chlorite and quartz in and around some garnets. Contemporaneous whit these retrograde processes, there is evidence of relatively high-temperature to low-temperature deformation Microstructure. The combination of evidence 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.

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APA: Copy

HASHEMI, M., SHABANIAN, N., DAVOUDIAN, A.R., & AZIZI, H.. (2020). Investigation of temperature variations and deformation stages with respect to microstructures and mineral paragenesis in paragneisses of Northern Shahrekord. GEOSCIENCES, 29(114 ), 165-174. SID. https://sid.ir/paper/31512/en

Vancouver: Copy

HASHEMI M., SHABANIAN N., DAVOUDIAN A.R., AZIZI H.. Investigation of temperature variations and deformation stages with respect to microstructures and mineral paragenesis in paragneisses of Northern Shahrekord. GEOSCIENCES[Internet]. 2020;29(114 ):165-174. Available from: https://sid.ir/paper/31512/en

IEEE: Copy

M. HASHEMI, N. SHABANIAN, A.R. DAVOUDIAN, and H. AZIZI, “Investigation of temperature variations and deformation stages with respect to microstructures and mineral paragenesis in paragneisses of Northern Shahrekord,” GEOSCIENCES, vol. 29, no. 114 , pp. 165–174, 2020, [Online]. Available: https://sid.ir/paper/31512/en

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