Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting

An integrated petrographic and geochemical study of the Ahwaz Sandstone Member of Oligocene- Miocene age, Asmari Formation in Zagros, southwest Iran, was carried out to infer their provenance and tectonic setting. This study is based on the analysis of core samples from three subsurface sections (we...

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Autores: Jafarzadeh, Mahdi, Hosseini-Barzi, Mahboobeh
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2018
País:México
Recursos:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
Repositório:Revista Mexicana de Ciencias Geológicas
Idioma:inglês
OAI Identifier:oai:ojs.rmcg.geociencias.unam.mx:article/656
Acesso em linha:http://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/656
Access Level:Acceso aberto
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spelling Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic settingPetrografía y geoquímica del Miembro de Arenisca Ahwaz de la Formación Asmari, Zagros, Iran: Implicaciones para la proveniencia y el ambiente tectónicoJafarzadeh, MahdiHosseini-Barzi, MahboobehAn integrated petrographic and geochemical study of the Ahwaz Sandstone Member of Oligocene- Miocene age, Asmari Formation in Zagros, southwest Iran, was carried out to infer their provenance and tectonic setting. This study is based on the analysis of core samples from three subsurface sections (wells Az-85, Az-11, and Az-89) in Ahwaz oil field in the Dezful embayment subzone.On the basis of the framework composition (point counting) and whole-rock geochemistry (major elements), the sandstones are classified as quartzarenite, sublitharenite, and subarkose types. Petro- graphic studies reveal that these sandstones contain quartz, feldspars and fragments of sedimentary and metasedimentary rocks. The modal analysis data of 50 collected (medium size and well sorted) samples, imply a recycled orogen and craton interior tectonic provenance. Moreover, petrographic point count data indicate quartz-rich sedimentary (recycled), middle to high-grade metamorphic, and plutonic par- ent rocks for the Ahwaz Sandstone. Tectonic setting discrimination diagrams based on major elements suggest a quartzose sedimentary provenance in a passive continental margin. As indicated by the CIW´ index (chemical index of weathering) of the Ahwaz Sandstone (average value of 67) their source area underwent “intense” recycling but “moderate” degree of chemical weathering. The petrography and geochemistry results are consistent with a semiarid climate and low-relief highlands.Un estudio petrográfico y geoquímico del Miembro de Arenisca Ahwaz del Oligoceno-Mioceno, Formación Asmari en Zagros, suroeste de Iran, fue realizado con el objeto de inferir su proveniencia y el ambiente tectónico. Este estudio se basó en el análisis de muestras de núcleos de tres secciones (pozos Az-85, Az-11, and Az-89) del campo petrolero Ahwaz, en la subzona de la bahía de Dezful.Usando la abundancia de los minerales principales (conteo de puntos) y la geoquímica de roca total (elementos mayores), las areniscas se clasificaron como cuarzoarenita, sublitoarenita y subarcosas. El estudio petrográfico revela que estas areniscas consisten de cuarzo, feldespatos y fragmentos de rocas sedimentarias y metasedimentarias. El análisis modal de 50 muestras recolectadas de grano medio y bien clasificadas, indica la proveniencia tectónica de un orógeno reciclado y del interior del cratón. Además, los datos petrográficos del conteo de puntos señalan que las rocas parentales fueron rocas sedimentarias ricas en cuarzo (recicladas), metamórficas de grado medio a alto, así como plutónicas. Los diagramas para ambientes tectónicos basados en elementos mayores sugieren una proveniencia sedimentaria rica en cuarzo en un ambiente tectónico de margen pasivo continental. Como lo indica el índice CIW´ (índice químico de intemperismo) para las muestras de la Arenisca Ahwaz (con valor promedio de 67) su área fuente fue sujeta a reciclaje intenso, pero a intemperismo químico de grado moderado. Los resultados de la petrografía y la geoquímica son consistentes con un clima semiárido y con terrenos poco elevados (de bajo relieve).  Universidad Nacional Autónoma de México2018-01-16info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/656Revista Mexicana de Ciencias Geológicas; Vol 25 No 2 (2008); 247-260Revista Mexicana de Ciencias Geológicas; Vol 25 No 2 (2008); 247-2602007-29021026-8774reponame:Revista Mexicana de Ciencias Geológicasinstname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICOinstacron:UNAMenghttp://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/656/514info:eu-repo/semantics/openAccessoai:ojs.rmcg.geociencias.unam.mx:article/6562024-08-16T19:51:46Z
dc.title.none.fl_str_mv Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting
Petrografía y geoquímica del Miembro de Arenisca Ahwaz de la Formación Asmari, Zagros, Iran: Implicaciones para la proveniencia y el ambiente tectónico
title Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting
spellingShingle Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting
Jafarzadeh, Mahdi
title_short Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting
title_full Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting
title_fullStr Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting
title_full_unstemmed Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting
title_sort Petrography and geochemistry of Ahwaz Sandstone Member of Asmari Formation, Zagros, Iran: implications on provenance and tectonic setting
dc.creator.none.fl_str_mv Jafarzadeh, Mahdi
Hosseini-Barzi, Mahboobeh
author Jafarzadeh, Mahdi
author_facet Jafarzadeh, Mahdi
Hosseini-Barzi, Mahboobeh
author_role author
author2 Hosseini-Barzi, Mahboobeh
author2_role author
description An integrated petrographic and geochemical study of the Ahwaz Sandstone Member of Oligocene- Miocene age, Asmari Formation in Zagros, southwest Iran, was carried out to infer their provenance and tectonic setting. This study is based on the analysis of core samples from three subsurface sections (wells Az-85, Az-11, and Az-89) in Ahwaz oil field in the Dezful embayment subzone.On the basis of the framework composition (point counting) and whole-rock geochemistry (major elements), the sandstones are classified as quartzarenite, sublitharenite, and subarkose types. Petro- graphic studies reveal that these sandstones contain quartz, feldspars and fragments of sedimentary and metasedimentary rocks. The modal analysis data of 50 collected (medium size and well sorted) samples, imply a recycled orogen and craton interior tectonic provenance. Moreover, petrographic point count data indicate quartz-rich sedimentary (recycled), middle to high-grade metamorphic, and plutonic par- ent rocks for the Ahwaz Sandstone. Tectonic setting discrimination diagrams based on major elements suggest a quartzose sedimentary provenance in a passive continental margin. As indicated by the CIW´ index (chemical index of weathering) of the Ahwaz Sandstone (average value of 67) their source area underwent “intense” recycling but “moderate” degree of chemical weathering. The petrography and geochemistry results are consistent with a semiarid climate and low-relief highlands.
publishDate 2018
dc.date.none.fl_str_mv 2018-01-16
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/656
url http://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/656
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv http://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/656/514
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional Autónoma de México
publisher.none.fl_str_mv Universidad Nacional Autónoma de México
dc.source.none.fl_str_mv Revista Mexicana de Ciencias Geológicas; Vol 25 No 2 (2008); 247-260
Revista Mexicana de Ciencias Geológicas; Vol 25 No 2 (2008); 247-260
2007-2902
1026-8774
reponame:Revista Mexicana de Ciencias Geológicas
instname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron:UNAM
instname_str UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron_str UNAM
institution UNAM
reponame_str Revista Mexicana de Ciencias Geológicas
collection Revista Mexicana de Ciencias Geológicas
repository.name.fl_str_mv
repository.mail.fl_str_mv
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