Recognition of Cenozoic stress field changes using brittle tectonic analysis in the Zagros simply folded belt (Shiraz Area)

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YOUSEFI T.; YAZDJERDI K.; Ghorash M.; SHAHIDI A.

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Journal: GEOSCIENCES Year:2020 | Volume:29 | Issue:115 Page(s): 229-240

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Title

Recognition of Cenozoic stress field changes using brittle tectonic analysis in the Zagros simply folded belt (Shiraz Area)

Author(s)

YOUSEFI T. | YAZDJERDI K. | Ghorash M. | SHAHIDI A. | Issue Writer Certificate

Keywords

Zagros simply folded beltQ1

inversion methodQ2

CenozoicQ2

styloliteQ1

brittle tectonicQ1

Abstract

The current form of the folded Zagros is the result of the oblique collision the Arabian and Iranian plates in Late Cenozoic. In this study, Cenozoic stress field changes in Zagros simply folded belt and structural evolution after collision in Shiraz Area have been evaluated. The geological formations under investigation are from Late Cretaceous to Neogene (Late Cenozoic). In this regard, geometry and kinematics of the faults, stylolites and other tectonic and stratigraphic evidence in geological formations outcrops in the study area at 30 stations were taken. The tension main axes ( crl ' cr2, cr3) were calculated by inversion method for the categorized data. The results of the reconstruction of the paleo stress show compressional and Strike-Slip tectonic regime in Cenozoic. Moreover, anticlockwise rotation of the direction of compressive stress over time is about 60 degrees. As pre-folding compressional stress direction (crl) is about N60E and its time is Miocene and before that. Whereas syn-folding stress direction is N35E and its age is equivalent to Pliocene that is the same age as old Bakhtiary formation. Stress changes in post-folding indicate N20E and its age equivalent to Pleistocene that is the same age as young Bakhtiary formation. At the present time, the maximum stress direction that is about N-S affects the area.

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APA: Copy

YOUSEFI, T., YAZDJERDI, K., Ghorash, M., & SHAHIDI, A.. (2020). Recognition of Cenozoic stress field changes using brittle tectonic analysis in the Zagros simply folded belt (Shiraz Area). GEOSCIENCES, 29(115 ), 229-240. SID. https://sid.ir/paper/377579/en

Vancouver: Copy

YOUSEFI T., YAZDJERDI K., Ghorash M., SHAHIDI A.. Recognition of Cenozoic stress field changes using brittle tectonic analysis in the Zagros simply folded belt (Shiraz Area). GEOSCIENCES[Internet]. 2020;29(115 ):229-240. Available from: https://sid.ir/paper/377579/en

IEEE: Copy

T. YOUSEFI, K. YAZDJERDI, M. Ghorash, and A. SHAHIDI, “Recognition of Cenozoic stress field changes using brittle tectonic analysis in the Zagros simply folded belt (Shiraz Area),” GEOSCIENCES, vol. 29, no. 115 , pp. 229–240, 2020, [Online]. Available: https://sid.ir/paper/377579/en

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