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Tectonic paleostress field and its impact on the geodynamic evolution of Central Iran, case study: the Shotori Mountain

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Journal of Mountain Science 2023年第10期20卷 3018-3034页

作者： Razieh ABBASPOUR Seyed Morteza MOUSAVI Ahmad RASHIDI Mohammad Mahdi KHATIB shahram shafieibafti Department of Geology University of BirjandBirjand ***Iran Department of Earthquake Research Shahid Bahonar University of KermanKerman ***Iran International Institute of Earthquake Engineering and Seismology Tehran ***Iran Department of Geology Shahid Bahonar University of KermanKerman ***Iran

The Shotori mountain range is located along the northern terminus of the Nayband fault on the eastern and western domains of the Tabas and Lut blocks,*** range with NNW-SSE trending and approximately 120 km long includes a series of thrust faults approaching the right-lateral strike-slip Nayband *** the Shotori range has experienced various geological events since the Triassic,our investigations suggest that the basement of the Central Iranian subcontinent of the Shotori range contains the early Triassic deep sedimentary with normal faults which confirms Triassic tensional tectonic stress regime in the *** the middle Triassic,the mountain range has experienced thrust and strike-slip ***,in this study,we reconstruct the stress regimes for different geological periods using fault-slip *** inversion of faultslip data reveals drastic temporal changes in the maximum stress regime(σ1)over the Triassic,Jurassic,Cretaceous,Paleogene,Neogen,and *** reconstruction of the stress field based on the age and direction of fault movement reveals that the direction of the maximum horizontal stress axis(σ1)under a tensional stress regime was approximately N129°in the Early *** stress regime is the cause of thinning and subsidence of the Shotori sedimentary *** the middle Triassic,theσ1 direction was about N81°and the upper Triassic,theσ1 direction was almost N115°.The middle Triassic and upper Triassic stress states exhibited two distinct strike-slip and compressive stress *** stress regime led to the uplift of the Shotori sedimentary *** the Jurassic,the direction of the maximum horizontal stress axis(σ1)was~NW-SE under a compressive stress *** the Triassic,theσ1 direction was~*** stress regime led to the formation of the high topography of the Shotori Mountain *** the Late Cretaceous,the direction of the maximum horizontal stress axis(σ1)under the extensional stress

关键词： Paleostress Fault-slip data Geodynamics Shotori mountain range Tabas Central Iran

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