Mineral chemistry and Thermobarometry of Middle Jurassic diabasic dikes Cutting metamorphic-igneous Shotor-Kuh complex (SE Shahrood)

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Shekari Sakineh; Sadeghian Mahmood; GHASEMI HABIB ALLAH; Mingo Jai

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2019 | Volume:26 | Issue:4 Page(s): 915-928

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Title

Mineral chemistry and Thermobarometry of Middle Jurassic diabasic dikes Cutting metamorphic-igneous Shotor-Kuh complex (SE Shahrood)

Author(s)

Shekari Sakineh | Sadeghian Mahmood | GHASEMI HABIB ALLAH | Mingo Jai | Issue Writer Certificate

Keywords

Mineral chemistryQ1

thermobarometryQ1

diabasic dikesQ1

back arc basinQ1

Shotor KuhQ1

ShahroodQ1

Abstract

Late Neoproterozoic metamorphic – igneous rocks of the Shotor Kuh complex is located in the northern edge of the Central Iran structural zone. This complex crosscut by several Middle Jurassic diabasic dikes. Plagioclase, pyroxene and biotite are the essential rock-forming minerals of these dikes. Plagioclases have mostly andesine composition (An31-49). Pyroxenes have following compositions: En30-45Fs29-42Wo25-29. Biotites with XFe = 0. 49-0. 53 and XMg= 0. 46-0. 5 are mostly Mg rich biotites. Temperatures and pressures obtained from clinopyroxene thermobarometry are in the range of 1200-1100° C and 10-2 kbar respectively. By attention to the results of chemichal composition of these minerals, magma forming of these dikes has calc-alkaline nature and during their crystallization oxygen fugacity has been low. The mentioned dikes generated in a tectonic setting accommodate to intracontinental extensional regime such as a back arc basin (subduction of Neo-Tethys oceanic lithosphere beneath the Central Iran zone).

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APA: Copy

Shekari, Sakineh, Sadeghian, Mahmood, GHASEMI, HABIB ALLAH, & Mingo, Jai. (2019). Mineral chemistry and Thermobarometry of Middle Jurassic diabasic dikes Cutting metamorphic-igneous Shotor-Kuh complex (SE Shahrood). IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 26(4 ), 915-928. SID. https://sid.ir/paper/408833/en

Vancouver: Copy

Shekari Sakineh, Sadeghian Mahmood, GHASEMI HABIB ALLAH, Mingo Jai. Mineral chemistry and Thermobarometry of Middle Jurassic diabasic dikes Cutting metamorphic-igneous Shotor-Kuh complex (SE Shahrood). IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2019;26(4 ):915-928. Available from: https://sid.ir/paper/408833/en

IEEE: Copy

Sakineh Shekari, Mahmood Sadeghian, HABIB ALLAH GHASEMI, and Jai Mingo, “Mineral chemistry and Thermobarometry of Middle Jurassic diabasic dikes Cutting metamorphic-igneous Shotor-Kuh complex (SE Shahrood),” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 26, no. 4 , pp. 915–928, 2019, [Online]. Available: https://sid.ir/paper/408833/en

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