Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Deciphering the stress field changes in Shahr-e-Babak area using brittle tectonic analysis

Document Type : Original Research Paper

Authors
L. Ebadi 1
S. A. Alavi 2
M. R. Ghassemi 3
1 Ph.D., Department of Geology, Faculty of Earth Sciences,Shahid Beheshti University, Tehran, Iran
2 Professor, Department of Geology, Faculty of Earth sciences, Shahid Beheshti University, Tehran, Iran
3 Associate Professor, Reaserch Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran
10.22071/gsj.2017.53931
Abstract
In this paper a part of the Shahr-e-Babak area in NW-Kerman is studied, which is geologically located in Central Iran and Urumiyeh- Dokhtar Belt. The basin was strongly affected by compression in Miocene times, in which deformation is characterized by development of NW-SE trending fold and thrust belt. In this paper, we aim atdeciphering polyphase deformation and paleostress history of part of the Central Iran in the Shahr-e-Babak area, and that how various geological aspects may be related to a stress field that has been reoriented through time. Also, we indicate how the brittle deformation studies and paleostress analyses may contribute in the interpretations of the post-collisional tectonic evolution of this area. In this paper, by using systematic brittle tectonic analyses, including stress tensor inversion form fault-slip data, we decipher the succession of deformational events that resulted in present-day structures. Therefore, a statistical view of the brittle tectonic reconstructions taken as a whole leads one to better understand the relationships between the different stress fields and folding events that governed the history of compression in this area .The systematic reconstruction of brittle tectonic regimes led us to characterize an anticlockwise change in the main direction of compression through time. Thus, it can be seen that the late Cretaceous to late Miocene pre-folding N055° and N084° compression was followed by syn-folding N040° compression in the Miocene. The Miocene compression then continued into the Pliocene post-folding N029° direction, and changed afterward to the Pleistocene-Recent post-folding N003° direction. Although this general anticlockwise rotation of compression has probably been progressive through time, our data suggest three distinct stress regimes that (1) predate, (2) are contemporaneous with, and (3) post-date the more consistent compressional stress regime of the folding and thrusting process. According to this reconstruction, it is confirmed that many  local right-lateral strike–slip faults were reactivated from NW-SE reverse faults in the Sahahr-e-Babak area of SW Central Iran .These results could properly support the hypothesis of a significant anticlockwise change in the movement direction of the Arabian plate with respect to the Eurasian plate and block rotation in Central Iran.
Keywords
Paleostress
brittle tectonic
rotation
Fold
Shahr-e-Babak
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Scientific Quarterly Journal of Geosciences
Volume 27, Issue 105
Autumn 2017
Pages 81-96