Style and Timing of Folding and Faulting in the Mahneshan Basin and the Takab Metamorphic Complex

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Alimoula Zeynab; NAJAFI MAHDI; Etemad Saeed Najmeh

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Journal: TECTONICS Year:2019 | Volume:3 | Issue:11 Page(s): 59-70

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Information Journal Paper

Title

Style and Timing of Folding and Faulting in the Mahneshan Basin and the Takab Metamorphic Complex

Author(s)

Alimoula Zeynab | NAJAFI MAHDI | Etemad Saeed Najmeh | Issue Writer Certificate

Keywords

Strain partitioning

Takab complex

Mahneshan Fault

Lower Red Formation

Abstract

The Mahneshan sedimentary basin is one of the Cenozoic syntectonic basins in the Central Iran, which is located between the western Alborz Mountains and the Takab complex. Our study area at the Mahneshan mainly includes Kahar Formation and granitic, gneissic and metamorphic units of the Takab complex and Cenozoic sedimentary and volcanic sequences including the Upper Red, Qom and Lower Red Formations. In this study, by combination of remote-sensing and extensive field mapping including fault kinematics, fold geometries, growth strata patterns and unconformities, a structural cross-section constructed across the Mahshan Basin and the Takab complex and geometric and kinematic relationships of the geological units were determined. According to the cross-section, the NW-trending Mahneshan Fault zone show an almost pure reverse mechanism with a right-lateral strike-slip component. On the other hand, the NW-SE trending faults of Takab complex have right strike-slip mechanism. Fault systems with thrust and strike-slip kinematics have aligned almost parallel in the Mahneshan Basin and Takab Metamorphic complex that documents prominent Strain partitioning in a transpressional deformation regime during post-Oligocene time. This structural model confirms hypothesis on Strain partitioning documented in other studies for the Central Iranian Basin. Syntectonic growth strata development in the Lower Red Formation and also sedimentary unconformities and onlap of the Lower Red and Qom Formations on older sedimentary and metamorphic units in the Takab complex and Mahnashan basin suggests that their deformation initiated during the latest Oligocene, which can be attributed to the onset of Arabia– Eurasia collision and exhumation of the western Alborz Mountains.

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APA: Copy

Alimoula, Zeynab, NAJAFI, MAHDI, & Etemad Saeed, Najmeh. (2019). Style and Timing of Folding and Faulting in the Mahneshan Basin and the Takab Metamorphic Complex. TECTONICS, 3(11 ), 59-70. SID. https://sid.ir/paper/401847/en

Vancouver: Copy

Alimoula Zeynab, NAJAFI MAHDI, Etemad Saeed Najmeh. Style and Timing of Folding and Faulting in the Mahneshan Basin and the Takab Metamorphic Complex. TECTONICS[Internet]. 2019;3(11 ):59-70. Available from: https://sid.ir/paper/401847/en

IEEE: Copy

Zeynab Alimoula, MAHDI NAJAFI, and Najmeh Etemad Saeed, “Style and Timing of Folding and Faulting in the Mahneshan Basin and the Takab Metamorphic Complex,” TECTONICS, vol. 3, no. 11 , pp. 59–70, 2019, [Online]. Available: https://sid.ir/paper/401847/en

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