Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran
In order to determine the accurate paleoenvironmental conditions of Qom Formation, one stratigraphic section was studied in the Urumieh-Dokhtar Zone (West of Ashtian). 60 thin sections of the Qom Formation, 71 m thick, were prepared and the distribution of benthic foraminifera was analyzed. On the b...
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Universidade Federal do Rio de Janeiro
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ftdoajarticles:oai:doaj.org/article:8e7d60ad71104c64b8c2a1317089b845 2023-05-15T18:00:55+02:00 Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran Zohre Holakouee Mehdi Yazdi Bizhan Yousef 2017-05-01T00:00:00Z https://doi.org/10.11137/2017_2_163_179 https://doaj.org/article/8e7d60ad71104c64b8c2a1317089b845 EN ES PT eng spa por Universidade Federal do Rio de Janeiro http://www.anuario.igeo.ufrj.br/2017_2/2017_2_163_179.pdf https://doaj.org/toc/0101-9759 https://doaj.org/toc/1982-3908 http://dx.doi.org/10.11137/2017_2_163_179 0101-9759 1982-3908 https://doaj.org/article/8e7d60ad71104c64b8c2a1317089b845 Anuário do Instituto de Geociências, Vol 40, Iss 2, Pp 163-179 (2017) Qom Formation Miocene Paleoenvironment Ramp Urumieh Dokhtar Iran Physical geography GB3-5030 Geography (General) G1-922 article 2017 ftdoajarticles https://doi.org/10.11137/2017_2_163_179 2022-12-31T08:42:08Z In order to determine the accurate paleoenvironmental conditions of Qom Formation, one stratigraphic section was studied in the Urumieh-Dokhtar Zone (West of Ashtian). 60 thin sections of the Qom Formation, 71 m thick, were prepared and the distribution of benthic foraminifera was analyzed. On the basis of the recognized foraminifera, the age of Qom Formation in the studied section is assigned to the Late Oligocene (Chattian). In this study, sex different biofacies and two lithofacies types have been recognized, that can be grouped into two depositional environments, back ramp (alluvium channel, lagoon and shoal) and the ramp (inner, middle and outer ramp). The alluvium channel is characterized by Gms (gravel with massive layering and abundant matrix). The shoal is represented by fine to medium sandstone: calcite cemented submature litharenite. The lagoon is dominated by the presence of bioclastic bryozoan corallinacea wackestone- packstone and bioclastic foraminifera corallinacean wackstone to packstone. The inner ramp is characterized by bioclastic benthic foraminifera (perforate and imperforate) wackestone-packstone and the middle ramp represented by bioclastic perforate foraminifera wackstone-packstone and bioclastic Operculina packstone. Outer ramp is characterized by bioclast benthic and planktonic foraminifera mudstone. Article in Journal/Newspaper Planktonic foraminifera Directory of Open Access Journals: DOAJ Articles The Ramp ENVELOPE(-38.305,-38.305,-53.990,-53.990) Ramp The ENVELOPE(166.433,166.433,-77.633,-77.633) Anuário do Instituto de Geociências - UFRJ 40 2 163 179 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Spanish Portuguese |
topic |
Qom Formation Miocene Paleoenvironment Ramp Urumieh Dokhtar Iran Physical geography GB3-5030 Geography (General) G1-922 |
spellingShingle |
Qom Formation Miocene Paleoenvironment Ramp Urumieh Dokhtar Iran Physical geography GB3-5030 Geography (General) G1-922 Zohre Holakouee Mehdi Yazdi Bizhan Yousef Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
topic_facet |
Qom Formation Miocene Paleoenvironment Ramp Urumieh Dokhtar Iran Physical geography GB3-5030 Geography (General) G1-922 |
description |
In order to determine the accurate paleoenvironmental conditions of Qom Formation, one stratigraphic section was studied in the Urumieh-Dokhtar Zone (West of Ashtian). 60 thin sections of the Qom Formation, 71 m thick, were prepared and the distribution of benthic foraminifera was analyzed. On the basis of the recognized foraminifera, the age of Qom Formation in the studied section is assigned to the Late Oligocene (Chattian). In this study, sex different biofacies and two lithofacies types have been recognized, that can be grouped into two depositional environments, back ramp (alluvium channel, lagoon and shoal) and the ramp (inner, middle and outer ramp). The alluvium channel is characterized by Gms (gravel with massive layering and abundant matrix). The shoal is represented by fine to medium sandstone: calcite cemented submature litharenite. The lagoon is dominated by the presence of bioclastic bryozoan corallinacea wackestone- packstone and bioclastic foraminifera corallinacean wackstone to packstone. The inner ramp is characterized by bioclastic benthic foraminifera (perforate and imperforate) wackestone-packstone and the middle ramp represented by bioclastic perforate foraminifera wackstone-packstone and bioclastic Operculina packstone. Outer ramp is characterized by bioclast benthic and planktonic foraminifera mudstone. |
format |
Article in Journal/Newspaper |
author |
Zohre Holakouee Mehdi Yazdi Bizhan Yousef |
author_facet |
Zohre Holakouee Mehdi Yazdi Bizhan Yousef |
author_sort |
Zohre Holakouee |
title |
Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
title_short |
Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
title_full |
Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
title_fullStr |
Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
title_full_unstemmed |
Biofacies Analysis of the Upper Oligocene Deposits (Qom Formation) in Urumieh Dokhtar Zone, Iran |
title_sort |
biofacies analysis of the upper oligocene deposits (qom formation) in urumieh dokhtar zone, iran |
publisher |
Universidade Federal do Rio de Janeiro |
publishDate |
2017 |
url |
https://doi.org/10.11137/2017_2_163_179 https://doaj.org/article/8e7d60ad71104c64b8c2a1317089b845 |
long_lat |
ENVELOPE(-38.305,-38.305,-53.990,-53.990) ENVELOPE(166.433,166.433,-77.633,-77.633) |
geographic |
The Ramp Ramp The |
geographic_facet |
The Ramp Ramp The |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Anuário do Instituto de Geociências, Vol 40, Iss 2, Pp 163-179 (2017) |
op_relation |
http://www.anuario.igeo.ufrj.br/2017_2/2017_2_163_179.pdf https://doaj.org/toc/0101-9759 https://doaj.org/toc/1982-3908 http://dx.doi.org/10.11137/2017_2_163_179 0101-9759 1982-3908 https://doaj.org/article/8e7d60ad71104c64b8c2a1317089b845 |
op_doi |
https://doi.org/10.11137/2017_2_163_179 |
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Anuário do Instituto de Geociências - UFRJ |
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40 |
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