MINERAL CHEMISTRY AND PETROGENESIS OF METABASITES OF SHOTOR-KUH METAMORPHIC - IGNEOUS COMPLEX (SE SHAHROOD) AS AN INDICATOR FOR EVOLUTION OF INTRACONTINENTAL EXTENSIONAL BASINS OF LATE NEOPROTEROZOIC

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SHEKARI S.; SADEGHIAN M.; ZHAI M.; GHASEMI H.; ZOU Y.

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Journal: GEOSCIENCES Year:2017 | Volume:27 | Issue:105 Page(s): 167-182

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Title

MINERAL CHEMISTRY AND PETROGENESIS OF METABASITES OF SHOTOR-KUH METAMORPHIC - IGNEOUS COMPLEX (SE SHAHROOD) AS AN INDICATOR FOR EVOLUTION OF INTRACONTINENTAL EXTENSIONAL BASINS OF LATE NEOPROTEROZOIC

Author(s)

Keywords

DIABASIC DIKE SWARMQ1

METABASITEQ2

AMPHIBOLITEQ2

CADOMIANQ1

CENTRAL IRANQ2

SHOTOR-KUHQ1

SHAHROODQ1

Abstract

Shotor-Kuh metamorphic - igneous complex is located at 80 km SE of SHAHROOD and at the northern edge of the CENTRAL IRAN structural zone. This complex includes a wide lithological composition range such as metapelite (micaschists and gneisses), metapsammites, METABASITEs (amphibolite and garnet AMPHIBOLITE), metacarbonate (limestone and dolomitic marbles) and metarhyolites. Protolith of METABASITEs was basaltic lavas, diabasic swarm dikes and small scale gabbro-dioritic intrusions. With respect to abundance and importance of metamorphosed basaltic intercalations and diabasic dikes swarm in comparison to the other basic rocks, this article specially advocated to investigate their evolution. Based on the field evidence and petrography, increasing the degree of metamorphism of METABASITEs resulted in producing of amphibole schist, AMPHIBOLITE, garnet AMPHIBOLITE and eventually amphibolitic migmatites. Thermobarometery based on the chemical analysis of garnet, amphibole and plagioclase of the METABASITEs indicates the temperarure range of 602-711 °C and pressure of 9-11 Kbar for their formation and final equilibrium, which corresponds to P-T conditions of AMPHIBOLITE and upper AMPHIBOLITEs facies. From the geochemical points of view, the magmas forming these METABASITEs had tholeitic to calc-alkaline nature. These magmas originated from the subcontinental lithospheric mantel source. Submarine basaltic lava flows and diabasic dikes swarm originated during extensional tectonic regimes which affected Late Neoproterozoic Iranian Gondwanan terrains. These extensional tectonic regimes are associated with producing of intracontinental sea to oceanic basins (rift or back arc). These basins closed in a short time and lead to generation of tectonic melange or accretionary prisms on the continental crust. Based on the U- Pb age dating on Zircons separated from these metasbasites, metamorphism event occurred in the interval time of 526-577 Ma (corresponding to the late Neoproterozoic and CADOMIAN orogeny in the Iranian Gondwanan terrains).

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APA: Copy

SHEKARI, S., SADEGHIAN, M., ZHAI, M., GHASEMI, H., & ZOU, Y.. (2017). MINERAL CHEMISTRY AND PETROGENESIS OF METABASITES OF SHOTOR-KUH METAMORPHIC - IGNEOUS COMPLEX (SE SHAHROOD) AS AN INDICATOR FOR EVOLUTION OF INTRACONTINENTAL EXTENSIONAL BASINS OF LATE NEOPROTEROZOIC. GEOSCIENCES, 27(105 ), 167-182. SID. https://sid.ir/paper/32267/en

Vancouver: Copy

SHEKARI S., SADEGHIAN M., ZHAI M., GHASEMI H., ZOU Y.. MINERAL CHEMISTRY AND PETROGENESIS OF METABASITES OF SHOTOR-KUH METAMORPHIC - IGNEOUS COMPLEX (SE SHAHROOD) AS AN INDICATOR FOR EVOLUTION OF INTRACONTINENTAL EXTENSIONAL BASINS OF LATE NEOPROTEROZOIC. GEOSCIENCES[Internet]. 2017;27(105 ):167-182. Available from: https://sid.ir/paper/32267/en

IEEE: Copy

S. SHEKARI, M. SADEGHIAN, M. ZHAI, H. GHASEMI, and Y. ZOU, “MINERAL CHEMISTRY AND PETROGENESIS OF METABASITES OF SHOTOR-KUH METAMORPHIC - IGNEOUS COMPLEX (SE SHAHROOD) AS AN INDICATOR FOR EVOLUTION OF INTRACONTINENTAL EXTENSIONAL BASINS OF LATE NEOPROTEROZOIC,” GEOSCIENCES, vol. 27, no. 105 , pp. 167–182, 2017, [Online]. Available: https://sid.ir/paper/32267/en

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