Environmental parameters of a coral assemblage from the Akerchi Formation (Carboniferous), Adarouch Area, central Morocco

[EN] Rich assemblages of rugose corals occur in the Tizra, Akerchi and Idmarrach formations (Mississippian) near El-Hajeb City. The Akerchi Formation, approximately 140 m thick, is divided into two members. The upper part of the lower member contains a biostrome 2 to 5 m thick, composed mainly of ru...

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Detalles Bibliográficos
Autores: Said, Ismail, Rodríguez, Sergio, Berkhli, M., Cózar, Pedro, Gómez-Herguedas, Alberto
Tipo de recurso: artículo
Fecha de publicación:2010
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/26786
Acceso en línea:http://hdl.handle.net/10261/26786
Access Level:acceso abierto
Palabra clave:Carboniferous
Viséan
Corals
Palaeoecology
Biostrome
Morocco
Carboníferogy
Viseense
Corales
Paleoecología
Biostromo
Marruecos
id ES_cee13b0772c5542dd596e67923de3fbd
oai_identifier_str oai:digital.csic.es:10261/26786
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Environmental parameters of a coral assemblage from the Akerchi Formation (Carboniferous), Adarouch Area, central Morocco
Parámetros ambientales de una asociación de corales de la Formación Akerchi (Carbonífero), Área de Adarouch, Marruecos central
title Environmental parameters of a coral assemblage from the Akerchi Formation (Carboniferous), Adarouch Area, central Morocco
spellingShingle Environmental parameters of a coral assemblage from the Akerchi Formation (Carboniferous), Adarouch Area, central Morocco
Said, Ismail
Carboniferous
Viséan
Corals
Palaeoecology
Biostrome
Morocco
Carboníferogy
Viseense
Corales
Paleoecología
Biostromo
Marruecos
title_short Environmental parameters of a coral assemblage from the Akerchi Formation (Carboniferous), Adarouch Area, central Morocco
title_full Environmental parameters of a coral assemblage from the Akerchi Formation (Carboniferous), Adarouch Area, central Morocco
title_fullStr Environmental parameters of a coral assemblage from the Akerchi Formation (Carboniferous), Adarouch Area, central Morocco
title_full_unstemmed Environmental parameters of a coral assemblage from the Akerchi Formation (Carboniferous), Adarouch Area, central Morocco
title_sort Environmental parameters of a coral assemblage from the Akerchi Formation (Carboniferous), Adarouch Area, central Morocco
dc.creator.none.fl_str_mv Said, Ismail
Rodríguez, Sergio
Berkhli, M.
Cózar, Pedro
Gómez-Herguedas, Alberto
author Said, Ismail
author_facet Said, Ismail
Rodríguez, Sergio
Berkhli, M.
Cózar, Pedro
Gómez-Herguedas, Alberto
author_role author
author2 Rodríguez, Sergio
Berkhli, M.
Cózar, Pedro
Gómez-Herguedas, Alberto
author2_role author
author
author
author
dc.subject.none.fl_str_mv Carboniferous
Viséan
Corals
Palaeoecology
Biostrome
Morocco
Carboníferogy
Viseense
Corales
Paleoecología
Biostromo
Marruecos
topic Carboniferous
Viséan
Corals
Palaeoecology
Biostrome
Morocco
Carboníferogy
Viseense
Corales
Paleoecología
Biostromo
Marruecos
description [EN] Rich assemblages of rugose corals occur in the Tizra, Akerchi and Idmarrach formations (Mississippian) near El-Hajeb City. The Akerchi Formation, approximately 140 m thick, is divided into two members. The upper part of the lower member contains a biostrome 2 to 5 m thick, composed mainly of rugose corals and gigantoproductid brachiopods embedded in marly limestone. Its local thickness increases from southwest to northeast in an outcrop extending for more than one kilometre. The Akerchi biostrome is mostly composed of rugose corals. Brachiopods, bryozoans, porifera (chaetetids, sponges), and molluscs are conspicuous elements of the biostrome, but none of them constitutes a significant component. Other common fossil taxa in thin sections are foraminifers, algae and cyanobacteria, ostracods, trilobites and echinoderms. The coral assemblage in the biostrome is regarded as a paleocommunity, because the biostrome is not composed of distinct coral bearing beds in different time slices, but rather, it is a mass of corals which in many instances show their original relationships and continuous colonial growth. The assemblage is diverse, including 12 genera and 20 species. Micro- and macrofacies analyses of corals and surrounding rock allowed some environmental inferences: a high level of energy is suggested by the degree of fragmentation of branches in fasciculate colonies and other features of the rocks. However, the energy was not high enough to destroy the colonies, and the presence of abundant micrite indicates that the energy level was discontinuous. Other environmental factors inferred from paleoecological and taphonomical evidences are shallow water with normal marine salinity and a hard substrate provided by quick cementation of oolite bar and by abundant bioclasts. Massive coral colonies and gigantoproductids are attached directly to the oolite bar which in turn provided a hard susbstrate for attachment of fasciculate corals that are dominant in the biostrome.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010
2010
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/26786
url http://hdl.handle.net/10261/26786
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://www.ucm.es/info/estratig/JIG/vol_content/abstjour36_1.htm
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 9475921 bytes
application/pdf
dc.publisher.none.fl_str_mv Universidad Complutense de Madrid
publisher.none.fl_str_mv Universidad Complutense de Madrid
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling Environmental parameters of a coral assemblage from the Akerchi Formation (Carboniferous), Adarouch Area, central MoroccoParámetros ambientales de una asociación de corales de la Formación Akerchi (Carbonífero), Área de Adarouch, Marruecos centralSaid, IsmailRodríguez, SergioBerkhli, M.Cózar, PedroGómez-Herguedas, AlbertoCarboniferousViséanCoralsPalaeoecologyBiostromeMoroccoCarboníferogyViseenseCoralesPaleoecologíaBiostromoMarruecos[EN] Rich assemblages of rugose corals occur in the Tizra, Akerchi and Idmarrach formations (Mississippian) near El-Hajeb City. The Akerchi Formation, approximately 140 m thick, is divided into two members. The upper part of the lower member contains a biostrome 2 to 5 m thick, composed mainly of rugose corals and gigantoproductid brachiopods embedded in marly limestone. Its local thickness increases from southwest to northeast in an outcrop extending for more than one kilometre. The Akerchi biostrome is mostly composed of rugose corals. Brachiopods, bryozoans, porifera (chaetetids, sponges), and molluscs are conspicuous elements of the biostrome, but none of them constitutes a significant component. Other common fossil taxa in thin sections are foraminifers, algae and cyanobacteria, ostracods, trilobites and echinoderms. The coral assemblage in the biostrome is regarded as a paleocommunity, because the biostrome is not composed of distinct coral bearing beds in different time slices, but rather, it is a mass of corals which in many instances show their original relationships and continuous colonial growth. The assemblage is diverse, including 12 genera and 20 species. Micro- and macrofacies analyses of corals and surrounding rock allowed some environmental inferences: a high level of energy is suggested by the degree of fragmentation of branches in fasciculate colonies and other features of the rocks. However, the energy was not high enough to destroy the colonies, and the presence of abundant micrite indicates that the energy level was discontinuous. Other environmental factors inferred from paleoecological and taphonomical evidences are shallow water with normal marine salinity and a hard substrate provided by quick cementation of oolite bar and by abundant bioclasts. Massive coral colonies and gigantoproductids are attached directly to the oolite bar which in turn provided a hard susbstrate for attachment of fasciculate corals that are dominant in the biostrome.[ES] Las formaciones Tizra, Akerchi e Idmarrach (Mississippiense) que afloran cerca de El-Hajeb City en Marruecos central han proporcionado diversas y abundantes asociaciones de corales rugosos. La Formación Akerchi, de unos 140 metros de espesor se divide en dos miembros. Los últimos metros del miembro inferior están constituidos por un biostromo de 2 a 5 metros de espesor compuesto principalmente por corales rugosos y braquiópodos gigantoprodúctidos englobados en caliza margosa, que se extiende más de 1 kilómetro. Además de los rugosos y braquiópodos, otros componentes notables son briozoos, poríferos (esponjas y chaetétidos) y moluscos, pero ninguno de ellos representa porcentajes importantes. Otros componentes fósiles frecuentes en lámina delgada son foraminíferos, algas y cianobacterias, ostrácodos, trilobites y equinodermos. La asociación del biostromo puede considerarse como una paleocomunidad, porque el biostromo no está compuesto por capas bien diferenciadas, sino que se trata de una masa de corales que en muchos casos muestran sus relaciones originales de crecimiento. La asociación de corales es diversa e incluye 12 géneros y 20 especies. Análisis macro y microfaciales de los corales y de las rocas que los rodean permiten algunas interpretaciones ambientales: un alto nivel de energía es sugerido por el grado de fragmentación de las ramas en corales fasciculados y otras características de las rocas. Sin embargo, la energía no era suficiente para fragmentar las colonias y la abundancia de micrita indica que el alto nivel de energía no era constante, permitiendo la decantación. Otros factores ambientales que se deducen de evidencias paleoecológicas y taxonómicas son profundidad escasa, salinidad normal y substrato duro provisto por una rápida cementación y por abundantes bioclastos. Colonias de corales masivos colonizaron una barra oolítica y proporcionaron el substrato duro necesario para la fijación de corales fasciculados que dominan en el biostromo.Field work and preparation of this paper were supported by research projects AECI, A/3770/05 and CGL2006-03085/BTE.Peer reviewedUniversidad Complutense de Madrid201020102010info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_65019475921 bytesapplication/pdfhttp://hdl.handle.net/10261/26786reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://www.ucm.es/info/estratig/JIG/vol_content/abstjour36_1.htminfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/267862026-05-22T06:33:51Z
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