STUDY OF RETROGRADE METAMORPHISM IN THE CALC-SILICATE ROCKS FROM THE ALVAND AUREOLE

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GHORBANI HALEH; MOAZZEN MOHSEN; SAKI ADEL

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: Iranian Journal of Geology Year:2017 | Volume:10 | Issue:40 Page(s): 33-43

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Title

STUDY OF RETROGRADE METAMORPHISM IN THE CALC-SILICATE ROCKS FROM THE ALVAND AUREOLE

Author(s)

GHORBANI HALEH | MOAZZEN MOHSEN | SAKI ADEL | Issue Writer Certificate

Keywords

ALVAND BATHOLITEQ2

RETROGRADE METAMORPHISMQ2

METAMORPHIC PROCESSESQ1

CLACQ2

SILICATEQ2

HAMADANQ2

Abstract

The Alvand batholith is intruded into the Jurassic argillaceous and carbonate rocks and has caused contact metamorphism. The calc-silicate hornfelses and varieties of pelitic and mafic hornfelses are produced in this regard. Based on the modal percentage, the calc-silicate rocks of the area can be divided into different groups. The present study shows that the calc-silicate hornfelses of the HAMADAN area are metamorphosed during two metamorphic phases, the prograde and the retrograde events. The prograde metamorphism formed anhydrous minerals such as pyroxene, garnet and vesuvianite. Following this phase, by reduction of temperature the RETROGRADE METAMORPHISM occurred and tremolite-actinolite, zoisite, epidote and to some extent hematite were formed. The rocks resulted from this metamorphism are epidote calc-silicate, epidote-tremolite-actinolite calcsilicate, zoisite calc-silicate and . RETROGRADE METAMORPHISM caused alteration along the grain boundaries and along the cleavage plane of the minerals (especially garnet). Furthermore, some textures, such as symplectite texture, were developed in the rocks, which is in accordance with decreasing temperature.

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APA: Copy

GHORBANI, HALEH, MOAZZEN, MOHSEN, & SAKI, ADEL. (2017). STUDY OF RETROGRADE METAMORPHISM IN THE CALC-SILICATE ROCKS FROM THE ALVAND AUREOLE. IRANIAN JOURNAL OF GEOLOGY, 10(40 ), 33-43. SID. https://sid.ir/paper/129502/en

Vancouver: Copy

GHORBANI HALEH, MOAZZEN MOHSEN, SAKI ADEL. STUDY OF RETROGRADE METAMORPHISM IN THE CALC-SILICATE ROCKS FROM THE ALVAND AUREOLE. IRANIAN JOURNAL OF GEOLOGY[Internet]. 2017;10(40 ):33-43. Available from: https://sid.ir/paper/129502/en

IEEE: Copy

HALEH GHORBANI, MOHSEN MOAZZEN, and ADEL SAKI, “STUDY OF RETROGRADE METAMORPHISM IN THE CALC-SILICATE ROCKS FROM THE ALVAND AUREOLE,” IRANIAN JOURNAL OF GEOLOGY, vol. 10, no. 40 , pp. 33–43, 2017, [Online]. Available: https://sid.ir/paper/129502/en

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