Analysis Elements of Fold Style in the Karbasi Anticline, Interior Fars Region, Zagros

The Karbasi anticline is located to the west-northwest of the Jahrom town, and 40 km to the northwest of Aghar gas anticline in interior Fars region. The anticline has an asymmetric structure, and some faults with large strike separations are observed in it. Because of the importance of comparison between the folds, and understanding folding patterns in different systems, analysis and description of basic elements of fold style is considered as a major components in structural studies. The aim of this study is to analyze the elements of fold style in the Karbasi anticline located in the interior Fars, in order to contribute to the exploration goals of hydrocarbon. The software used in this study include Tectonics FP, Global Mapper, and software related to Geo Modelling. Analysis of fold style elements in the different parts of the Karbasi anticline indicates changes in the pattern of folding. The changes in the western part of the Karbasi anticline is different other parts of the anticline. Based on prepared stereoplots, fold axis and axial plane show major changes in the western part of the anticline. In the study area Dashtak Formation as a middle detachment unit plays a major role in development of the geometry of folds. Based on our results, it seems the western part of the anticline is affected by more deformation. It is probable that in this part, the Nezam-Abad fault has caused rotation of the western plunge of the fold towards north, and has affected the Karbasi anticline. Based on the modeling done for the study area, a secondary fault is indicated related to the Nezamabad fault.