TY - JOUR ID - 80013 TI - Maastrichtian tectono-sedimentary evolution of the western Fars area (Zagros, SW Iran): insights into a foreland basin deposits JO - Geopersia JA - GEOPE LA - en SN - 2228-7817 AU - Abbasi, Rakhshandeh AU - Piryaei, AliReza AU - Ghorbani, Mansour AU - Mobasheri, Ali AD - Department of Geology, Faculty of Sciences, University of Hormozgan, Bandar Abbas, Iran AD - Department of Surface Geology, Exploration Directorate, National Iranian Oil Company, Tehran, Iran Y1 - 2021 PY - 2021 VL - 11 IS - 2 SP - 337 EP - 360 KW - Fars Area KW - Maastrichtian KW - Foreland basin KW - sequence stratigraphy KW - progradational pattern DO - 10.22059/geope.2021.316509.648591 N2 - Late Cretaceous time interval as a turning point in the Zagros history is characterised by the obduction of oceanic sedimentary cover of the Neotethys over the NE-tilted Arabian Platform. This event was associated with tectono-sedimentary loading and creating a foreland basin along the NE margin of the Arabian plate resulting in huge thickness and facies variations. For stepping the events and showing the foreland basin evolution during the Maastrichtian time, a SW-NE trending regional transect of several outcrop and well sections is constructed and interpreted in a high resolution sequence stratigraphic framework (six depositional sequences). In general, three phases of foreland basin evolution could be determined along the transect: tilting and backstepping of the platform, foredeep basin development and SW prograding of the subsiding platform during the Santonian, Campanian and Maastrichtian sequences respectively. The Tarbur Formation with shallow water carbonates is the main lithostratigraphic unit of the Maastrichtian, which laterally grades to the pelagic marls of the Gurpi Formation to the SW and onlaps onto the obducted radiolarite and ophiolitic complex to the NE Fars area. Temporal and spatial developments of platform carbonates of the Tarbur Formation and its equivalent basinal marls of the upper part of the Gurpi Formations is an indication to show how foreland basin migrated during this time interval. The Maastrichtian succession deposited from tidal flat to basinal environments. Initiation and re-activation of the basement faults are one of the most important controlling factors in accommodation spaces which overprinted locally by the holokinetic movements. UR - https://geopersia.ut.ac.ir/article_80013.html L1 - https://geopersia.ut.ac.ir/article_80013_6d1782203408252b2593e564f5a280ca.pdf ER -