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

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

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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-arc basin.

carbonate rampdepositional faciessubmarine faneustasybasement faultsback-arc basin

Masoud SHARIFI-YAZDI、Amirhossein ENAYATI、Jamal SALEHI AGHDAM、Mohammad BAHREHVAR、Seyed Mustafa REZAEI

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Department of Geology,Faculty of Earth Sciences,Geography and Astronomy,University of Vienna,1090 Vienna,Austria

Geology and Geophysics Department,Tehran Energy Consultants(TEC Co.),Tehran,Iran

School of Geology,College of Science,University of Tehran,Tehran,Iran

Department of Geology,Tarbiat Modares University,Tehran,Iran

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University of Tehran

2024

10.1111/1755-6724.15151

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
年,卷(期)：2024.98(1)
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