SED Solid Earth Discussions SED Solid Earth Discuss. 1869-9537 Göttingen, Germany 10.5194/sed-6-2143-2014 Structural style and hydrocarbon trap of Karbasi anticline, in the Interior Fars region, Zagros, Iran Maleki Z. 1 Arian M. 1 Solgi A. 1 Department of Geology, College of Basic Sciences, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran 31 07 2014 6 2 2143 2167 Copyright: © 2014 Z. Maleki et al. 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://se.copernicus.org/preprints/6/2143/2014/sed-6-2143-2014.html The full text article is available as a PDF file from https://se.copernicus.org/preprints/6/2143/2014/sed-6-2143-2014.pdf

Karbasi anticline between west-northwest parts of Jahrom town is located in northwest 40 km distance of Aghar gas anticline in interior Fars region. This anticline has asymmetric structure and some faults with large strike separation observed in its structure. The operation of Nezamabad sinistral strike slip fault in west part of this anticline caused fault plunge change in this region. <br><br> Because of complication increasing of structures geometry in Fars region and necessity to exploration activities for deeper horizons especially the Paleozoic ones, the analysis of fold style elements, which is known as one of the main parts in structural studies seems necessary. In this paper because of some reasons such as Karbasi anticline structural complication, importance of drilling and hydrocarbon explorations in Fars region, it is proceed to analysis and evaluation of fold style elements and geometry with emphasis on Nezamabad fault operation in Interior Fars region. According to fold style elements analysis results, it became clear that in east part of anticline the type of fold horizontal moderately inclined and in west part it is upright moderately plunging, so west evaluation of anticline is affected by more deformation. In this research the relationship present faults especially the Nezamabad sinistral strike slip one with folding and its affection on Dehram horizon and Bangestan group were modeled. Based on received results may be the Nezamabad fault is located between G–G' and E–E' structural sections and this fault in this area operated same as fault zone. In different parts of Karbasi anticline, Dashtak formation as a middle detachment unit plays an important role in connection to folding geometry, may be which is affected by Nezamabad main fault.

 References Alavi, M.: Tectonics of the Zagros orogenic belt of Iran: new data and interpretations, Tectonophysics, 229, 211–238, 1994. Alavi, M.: Structures of the Zagros fold-thrust belt in Iran, Am. J. Sci., 307, 1064–1095, 2007. Dehbashi Ghanavati, N.: Geometry of Folding Style Analysis in the Coastal Fars and Effects of Nezamabad Fault in the Structures Region, Ph.D. thesis of structural geology, 2009. De Sitter, L.: Structural Geology, McGraw- Hill, London, 375 pp., 1956. Geological Map of Jahrom, National Iranian Oil Company, 2001. Geological Map of Karbasi Anticline, National Iranian Oil Company, 2001. Geological Map of Kushk: National Iranian Oil Company, 2001. Jamison, W. R.: Geometric analysis of fold development in overthrust terrenes, J. Struct. Geol., 9, 207–219, 1987. Kamaletdinov, M. A., Kazantseva, T. T., and Kazantsev, Y. V.: Overthrust structure of the Ufa Amphitheater, Int. Geol. Rev., 24, 304–312, 1982. Letouzey, J.: Detachment folding in the central eastern Zagros fold–belt (Iran): salt mobility, multiple detachments and late basement control, J. Struct. Geol., 27, 1680–1696, 2005. Mitra, S.: Fold-accommodation faults, AAPG Bull., 86, 671–693, 2002. Mitra, S.: A unified kinematic model for the evolution of detachment folds, J. Struct. Geol., 25, 1659–1673, 2003. O Brien, C. A. E.: Salt diapirism in south Persia, Geological Mijnbouw, 19, 357–376, 1957. Ragan, D. M.: Structural Geology, an Introduction to Geometrical Techniques, 3rd edn., John Wiley & Sons, Inc, 210–215, 1985. Rickard, M. J.: A classification diagram for fold orientation, Geol. Mag., 108, 23–26, 1971. Shamshiri, M.: The Exploration Project of Fars Region, 2001. Sherkati, S. and Letouzey, J.: Variation of structural style and basin evolution in the central Zagros (Izeh zone and Deezful Embayment), Iran, Mar. Petrol. Geol., 21, 535–554, 2004. Suppe, J.: Geometry and kinematics of fault-bend folding, Am. J. Sci., 283, 684–721, 1985. Tavakoli, S.: Structural Geology Report of Karbasi Anticline, National Iranian Oil Company, 2001. Twiss, R. J. and Moores, E. M.: Structural Geology, W. H. Freeman and Company, New York, 101–105, 224–230, 1992.