Textural relations, P-T path, polymetamorphism and also geodynamic significance of metamorphic rocks of the Aligudarz-Khonsar region, Sanandaj-Sirjan zone, Iran
- Авторлар: Karimi S.1, Tabatabaei Manesh S.M.2
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Мекемелер:
- Young Researchers Club, Khorasgan Branch
- Department of geology
- Шығарылым: Том 24, № 1 (2016)
- Беттер: 100-115
- Бөлім: Article
- URL: https://journals.rcsi.science/0869-5911/article/view/177421
- DOI: https://doi.org/10.1134/S086959111506003X
- ID: 177421
Дәйексөз келтіру
Аннотация
The metamorphic rocks of the Aligudarz-Khonsar region can be divided into nine groups: slate, phyllite, sericite schist, biotite-muscovite schist, garnet schist, garnet-staurolite schist, staurolite schist, mylonitic granite, and marble. In this metamorphic region, four phases of metamorphism can be identified (dynamothermal, thermal, dynamic and retrograde metamorphism) and there are three deformation phases (D1, D2 and D3). Paleozoic pelagic shales experienced prograde metamorphism and polymetamorphism from the greenschist to amphibolite facies along the kyanite geotherm. The metapelites show prograde dynamothermal metamorphism from the greenschist to amphibolite facies. Maximum degree of dynamothermal metamorphism is seen in the Nughan bridge area. Also development of the mylonitic granites in the Nughan bridge area shows that dynamic metamorphism in this area was more intense than in other parts of the AligudarzKhonsar metapelitic zone. The chemical zoning of garnets shows three stages of growth and syn-tectonic formation. With ongoing metamorphism, staurolite appeared, and the rocks reached amphibolite facies, but the degree of metamorphism did not increase past the kyanite zone. Thus, metamorphism of the pelitic sediments occurred at the greenschist to amphibolite facies (kyanite zone). Thermodynamic studies of these rocks indicate that the metapelites in the Aligudarz-Khonsar region formed at 490–550°C and 0.47–5.6 kbar.
Негізгі сөздер
Авторлар туралы
Somaye Karimi
Young Researchers Club, Khorasgan Branch
Хат алмасуға жауапты Автор.
Email: karimisomaie@gmail.com
Иран, Isfahan
Seyed Tabatabaei Manesh
Department of geology
Email: karimisomaie@gmail.com
Иран, Isfahan, 81746-73441
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