Mehran Arian ¹, Mohsen Pourkermani ², Azar Khodabakhshnezhad ³, Hamideh Noroozpour

Affiliations
1 Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran
3 Young Researchers Club, Science and Research Branch, Islamic Azad University, Tehran, Iran

Abstract

Asmari anticline (with 30 km length, 10 km width&1391 m height) is a NW-SE anticline in the North of Dezful Embayment sub-basin of Zagros. Anticlines of Zagros are signal for oil resources. Hence, Asmari anticline is analyzed, because it should be extended to trap. Items such as tectonic system after and before trap forming, detection of workable traps and finally resolving proper points for well drilling are investigated. We found that there is a relation between growth of Asmari anticline up Asmari fault, fracture spread and first oil migration in Asmari formation. As a result, with reference to Asmari thrust depth, Khami and Dehram groups could be suggested as a proper oil reservoir.

Keywords

Asmari, Anticline, Dezful, Khami, Oil Resource, Zagros

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Seyed Hossein Mirzeinaly Yazdi ¹, Mohsen Pourkermani ², Mehran Arian ¹, Azam Karkheiran ¹

Affiliations
1 Department of Geology, Science and Research Branch, Islamic Azad University, Hesarak, Tehran, IR
2 Department of Geology, North Tehran Branch Islamic Azad University, Tehran

Abstract

Sabzevar ophiolite zone (SOZ) is in north of Central Iran that separated Kop-e-Dagh Sedimentary basin (in north) from the Central Iran plateau (in South). The evolution and replace time of this ophiolite complex has been respectively in upper Cretaceous and Middle Campanian to Upper Mastrishtian. This ophiolite belt contains a large amount of ultramafic rocks, small masses of Gabbro and thick sequence of submarine basaltic lavas. This study surveys the brittle structures that developed during the mountain building process to decipher the history of polyphase deformation. Analytic inversion techniques enabled us to determine and separate different brittle tectonic regimes in terms of stress tensors. Results indicate that oldest generation of stress on the area after the adoption of the ophiolite (Middle Campanian to Late Mastrishtian), is the tensile stress regime. Average direction of σ1 stress axis in this regime is 251/81. This tension is Because of subsidence of ophiolites after the adoption (located) on ground surface. Middle generation of stress has been strike slip regime and average direction of σ2 stress axis in this regime is 323/62. Finally, the newest generation of stress is compressional regime with an average direction of σ3 stress axis 308/81. In this regime σ1 direction is 183/05 that has caused re activity of main pre-existing structures with N121 direction. Our reconstruction of stress fields suggests an anticlockwise reorientation of the horizontal s1 axis since the located of ophiolites on the ground and a significant change in vertical stress from σ1 to σ3 since the late stage of thrusting. Transition from tension to compression has been strike slip movement. Ratio of elliptical stress in any of the regimes, respectively, from old to new is 0.63, 0.75 and 0.62 that due to overcome of shear regimes, average form of stress elliptical in area, is intermediate between the prolate and oblate forms.

Keywords

Compressive Tectonic, Analytic Inversion, Stress Tensor, Ophiolite Complex

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Mohsen Jami ¹, Elahe Javadi Mousavi ¹, Atieh Hadizadeh ¹, Mohsen Pourkermani ¹

Affiliations
1 Science and Research Branch, Islamic Azad University, Department of Geology, Tehran, IR

Abstract

Saravan fault in Iran is a reverse fault with the dextral strike- slip component. In this paper, we studied the Current Activity Effects of this fault on Regional Structural Geomorphology. This study includes not only the new Neotectonic evidences but also parameters such as mountain front sinuosity 1, rate index (V) , Hydraulic Gradient Index of Stream (SL) that has carried out by field sampling , using satellite images , topographic maps and SRTM data. The mean calculated values from geomorphologic indices of meanders of mountain front, the ratio of valley bottom over its height and the ratio of V are 1.76, 0.98, and 0.77, respectively. These values indicate the high tectonic activities in Saravan region. The existence of Geomorphologic Evidences such as moved channels has proved Dextral Fault for the youngest stage of performance called Post-Cenozoic. It is found by the study of regional morph tectonic units such that the whole region is active tectonically, and Saravan fault where located in the middle part has higher activity than its two northwestern and southeastern extremes

Keywords

Saravan Fault, Iran, Morphtectonic, Geotectonic

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