OIB-like Alkaline Gabbro of Cheshmeh Ghassaban-Hamedan: Implications for Middle Jurassic Neo-Tethys Ocean Ridge Subduction, Sanandaj-Sirjan Zone

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Mossavvari F.; Zarei Sabamieb R.; SAKI A.; Tabbakh Sbabani A.A.; AHMADI KHALAJI A.

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Journal: GEOSCIENCES Year:2020 | Volume:29 | Issue:115 Page(s): 277-288

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Title

OIB-like Alkaline Gabbro of Cheshmeh Ghassaban-Hamedan: Implications for Middle Jurassic Neo-Tethys Ocean Ridge Subduction, Sanandaj-Sirjan Zone

Author(s)

Keywords

OIB-like alkaline gabbroQ1

Oceanic ridge subductionQ1

Sanandaj-Sirjan ZoneQ1

AlvandQ2

HamedanQ2

Abstract

The metamamorphic rocks of Sanandaj-Sirjan Zone (SSZ) in the west part of Hamedan at CheshmehGhassaban village were intruded by olivine gabbro-gabbro at the middle Jurassic. The rocks consist of olivine, clinopyroxene, plagioclase, phologopite, brown amphibole and biotite and belong to alkaline series, derived from partial melting in the stability field of a garnet peridotite. Moreover, LREE enrichment of in chondrite normalized REE pattern, and relatively high ratios of LaJYbN (6. 65-11. 25), Nb/Yb (22-22. 38), Th/Nb (0. 07-0. 16) and NbN (>l) indicate that the rocks originated from an ocean island basalt like (OIB-like) sublithospheric mantle source and juxtaposed with and intruded into continental crust. With respect to geodynamic model of SSZ in the Alvand area in the middle Jurassic, ascribed to the subduction of the Neo-Tethys oceanic crust below the SSZ, the "Ridge-Trench" subduction model is proposed for these gabbros. Based on this model, the subduction of the active spreading center of the Neo-Tethys oceanic crust produced a slab window in the subducted oceanic lithosphere, allowing infiltration of astenospheric hot OIB-like melt into SSZ. In addition, the development of a very substantial volume of S-type granitoid rocks in the Alvand granitoid complex of Hamedan region can be attributed to the melting of the metapilitic rocks due to ridge subduction events.

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APA: Copy

Mossavvari, F., Zarei Sabamieb, R., SAKI, A., Tabbakh Sbabani, A.A., & AHMADI KHALAJI, A.. (2020). OIB-like Alkaline Gabbro of Cheshmeh Ghassaban-Hamedan: Implications for Middle Jurassic Neo-Tethys Ocean Ridge Subduction, Sanandaj-Sirjan Zone. GEOSCIENCES, 29(115 ), 277-288. SID. https://sid.ir/paper/378194/en

Vancouver: Copy

Mossavvari F., Zarei Sabamieb R., SAKI A., Tabbakh Sbabani A.A., AHMADI KHALAJI A.. OIB-like Alkaline Gabbro of Cheshmeh Ghassaban-Hamedan: Implications for Middle Jurassic Neo-Tethys Ocean Ridge Subduction, Sanandaj-Sirjan Zone. GEOSCIENCES[Internet]. 2020;29(115 ):277-288. Available from: https://sid.ir/paper/378194/en

IEEE: Copy

F. Mossavvari, R. Zarei Sabamieb, A. SAKI, A.A. Tabbakh Sbabani, and A. AHMADI KHALAJI, “OIB-like Alkaline Gabbro of Cheshmeh Ghassaban-Hamedan: Implications for Middle Jurassic Neo-Tethys Ocean Ridge Subduction, Sanandaj-Sirjan Zone,” GEOSCIENCES, vol. 29, no. 115 , pp. 277–288, 2020, [Online]. Available: https://sid.ir/paper/378194/en

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