STRUCTURAL AND SEISM OTECTONICAL ANALYSIS OF DEHSHIR FAULT (YAZD)

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MEHRNAHAD H.; MEHRSHAHI D.

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Journal: GEOGRAPHICAL RESEARCH Year:2005 | Volume:20 | Issue:3 (78) Page(s): 118-127

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Title

STRUCTURAL AND SEISM OTECTONICAL ANALYSIS OF DEHSHIR FAULT (YAZD)

Author(s)

MEHRNAHAD H. | MEHRSHAHI D. | Issue Writer Certificate

Keywords

FAULTQ2

TECTONICQ2

GEOMORPHOLOGYQ2

DEHSHIRQ4

ZAGROSQ2

IRANQ2

Abstract

Dehshir FAULT is located in the southern part of Shirkuh Mountains, with a relatively parallel trend with ZAGROS Main FAULT. This FAULT is an important zone for the occurrence of the Coloured Melange. To the west and southwest areas of this FAULT Gavkhouni, Abarkuh and Sirjan depressions (Nabavi, 1355). With the length of some 350 km, it starts with a NW-SE trend from Nain and ends near Sirjan (Berberian, 1367).A significant characteristic of DEHSHIR-Baft FAULT is related to its neotectonic activities. Examples of such processes have been discussed in this paper. Around the main FAULT zone, even along the secondary local FAULTs within this zone, dry channels displacement occurred which could be related to mostly right-lateral strike slip movement of these FAULTs. On the other hand, Mesozoic sediments and Ceneozoic intrusive features have gone through a metasomthism phase (or phases) by hydrothermal processes. The hydrothermal activities probably occurred during early Quaternary which was due to reactivating of the FAULT during post-Passadenian orogenic movements. Throughout the FAULT zone, younger alluvial fans overtopped the older ones which is also the evidence of neotectonic activity of the FAULT. Such morphologic features indicate the recent activity of DEHSHIR FAULT. Travertine springs and domes also appeared within the FAULT zone, which mainly concentrated around the FAULT-based joint systems. The joint systems follow the main course of the FAULT. Another evidence of TECTONIC movements along the FAULT zone is indicated by a sharp mountain front along the FAULT. In some places the FAULT line cut through travertine layers which has led to the occurrence of escarpments and steep slope, while near to the playa areas causes distinct different elevations.Geomorphological and geological evidence suggest the last activity of this FAULT had a right-slip nature with an orthogonal constituent. DEHSHIR FAULT, from a seismologic point of view, could have immobile characteristics with no evidence of large-scale earthquake in its territory (Berberian, 1967). However, it could be the source of potential risk in the future, so needs more survey and study to establIsh a firm suggestion for the probable activity of the FAULT.

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APA: Copy

MEHRNAHAD, H., & MEHRSHAHI, D.. (2005). STRUCTURAL AND SEISM OTECTONICAL ANALYSIS OF DEHSHIR FAULT (YAZD). GEOGRAPHICAL RESEARCH, 20(3 (78)), 118-127. SID. https://sid.ir/paper/29844/en

Vancouver: Copy

MEHRNAHAD H., MEHRSHAHI D.. STRUCTURAL AND SEISM OTECTONICAL ANALYSIS OF DEHSHIR FAULT (YAZD). GEOGRAPHICAL RESEARCH[Internet]. 2005;20(3 (78)):118-127. Available from: https://sid.ir/paper/29844/en

IEEE: Copy

H. MEHRNAHAD, and D. MEHRSHAHI, “STRUCTURAL AND SEISM OTECTONICAL ANALYSIS OF DEHSHIR FAULT (YAZD),” GEOGRAPHICAL RESEARCH, vol. 20, no. 3 (78), pp. 118–127, 2005, [Online]. Available: https://sid.ir/paper/29844/en

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