Platform Evolution in an Oligo-Miocene Back-arc Basin:An Example from the Central Iran Basin  

作　　者：Masoud SHARIFI-YAZDI Amirhossein ENAYATI Jamal SALEHI AGHDAM Mohammad BAHREHVAR Seyed Mustafa REZAEI 

机构地区：[1]Department of Geology,Faculty of Earth Sciences,Geography and Astronomy,University of Vienna,1090 Vienna.Austria [2]Geology and Geophysics Department,Tehran Energy Consultants(TEC Co.),Tehran,Iran [3]School of Geology,College of Science,University of Tehran,Tehran,Iran [4]Department of Geology,Tarbiat Modares University,Tehran,Iran

出　　处：《Acta Geologica Sinica(English Edition)》2024年第1期185-206,共22页地质学报（英文版）

摘　　要：The Qom Formation is the most important hydrocarbon reservoir target in Central Iran.The Qom platform developed in a back-arc basin during the Oligo-Miocene due to the closing of the Tethyan Seaway.This formation consists of a variety of carbonate and non-carbonate facies deposited on a platform ranging from supratidal to basin.A combination of tectonic and eustatic events led to some lateral and vertical facies variations in the study area.Six third-order depositional sequences and related surfaces were identified regarding vertical facies changes in the studied sections of this Oligo-Miocene succession.According to all results and data,this succession was initially deposited during the Chattian upon a distally steepened ramp of siliciclastic-carbonate composition,including the Bouma sequence.Then,from the late Chattian to the Aquitanian,the platform changed into a homoclinal carbonate ramp with a gentle profile.With respect to tectonic activity,this phase was a calm period during the deposition of the Qom Formation.Finally,a drowned carbonate platform and a rimmed shelf emerged during the Burdigalian,terminated by the continental deposits of the Upper Red Formation.Regarding all geological characteristics,three main tectono-eustatic evolutionary phases have been recognized in the Qom back-arcbasin.

关 键 词：carbonate ramp depositional facies submarine fan EUSTASY basement faults back-arc basin 

分 类 号：P618.13[天文地球—矿床学]