Javad Ashjari and Ezzat Raeisi. Influences of anticlinal structure on regional flow, Zagros, Iran.Journal of Cave and Karst Studies, v. 68, no. 3, p. 118−129. INFLUENCES OF ANTICLINAL STRUCTURE ON REGIONAL FLOW, ZAGROS, IRAN JAVAD ASHJARI Geosciences Department, College of Science, Shiraz University, Shiraz, Iran, or Swiss Institute for Speleology and Karstology (SISKA), CH-2301 La Chaux-de- Fonds, Switzerland,
[email protected] EZZAT RAeiSI Geosciences Department, College of Science, Shiraz University, Shiraz, Iran,
[email protected] Carbonate karstic formations outcrop in about 23% of the Zagros Region. Seventy-two karstic anticlines were selected to study regional flow. Based on geometry of the anticline and outflow position, a conceptual model is presented for delineation of flow direction, at least within Za- gros. The anticlines were divided into two main groups based on presence or absence of hydrau- lic connectivity between the limbs. The geological and tectonic settings are the main controlling factors within these two groups. Sixty-four out of the seventy-two anticlines showed no hydraulic connectivity between their limbs. Each group was further classified into four subgroups based on the location of the discharge zones, namely one or both plunge apex noses, limb, traversing river, or a combination of plunge apexes, limbs and river. The discharge zones may be located in the adjacent or in the successive anticlines. The discharge zones are mainly controlled by local base level. In most of the cases having no hydraulic connection between the limbs, the direction of flow is initially along the bedding plane dip and finally parallel to the strike at the foot of the anticline.