Comprehensive Study of Sedimentology and Sedimentary environment of Alluvial Fans Around Ben County (northwest of Chaharmahal and Bakhtiari Province, Iran)

Bardeh is a village of the capital part of the Ben County in Chaharmahal and Bakhtiari Province of Iran. In these studies, three general categories of alluvial fans were observed including alluvial fans of southern Bardeh (about 7 alluvial fans), alluvial fans of southern Bardeh (about 20 alluvial fans), alluvial fans around Sheikh Shaban (about 5 main alluvial fans). According to the studies, alluvial fans of southern Bardeh are mainly limited to proximal and medial parts due to the high dip arising from the main fault of the region; due to lack of the distal part or its low development, the distal part has fewer mineral resources than other parts. The study of drilling wells indicates that from Bardeh toward the northwestern parts, the feasibility of presence of underground water resources is higher than southwestern parts (due to marl layers). Considering the note that studies have been extensive, most of the introduced facies are distinguished by Miall (Miall, 2006); they are coarse-grain facies (Gmg, Gmm Gcm, Gp, Gci, Gp), medium-grain facies (St, Sm, Sh, Sl) and fine-grain facies (FM). The study of the SMF index indicates moderate to weak tectonic movements and low uplifting rate of the mountain front in the southern Bardeh, severe tectonic movements and relatively high uplifting rate of the mountain front in northern Bardeh, moderate to weak tectonic movements and low uplifting rate of the mountain front in the northern Sheikh Shaban.