Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid)

The research during the construction of the M-50 highway has allowed the study of the silica levels that constitute the most important Neolithic flint mine in the Iberian Peninsula. A group of more than 3.800 extraction pits were realized to obtain cherts and opals that appear among Mg smectites bed...

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Detalles Bibliográficos
Autores: Bustillo Revuelta, María Ángeles, Pérez Jiménez, José Luis
Tipo de recurso: artículo
Fecha de publicación:2005
País:España
Institución:Universidad de Huelva (UHU)
Repositorio:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Idioma:español
OAI Identifier:oai:ariasmontano.uhu.es:10272/8693
Acceso en línea:http://hdl.handle.net/10272/8693
Access Level:acceso abierto
Palabra clave:Chert
Opal
Silicification
Mg-smectite
Phreatic-vadose environments
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spelling Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid)Differential features and genesis of silica levels mined in the Casa Montero archaeological site. (Vicálvaro, Madrid)Bustillo Revuelta, María ÁngelesPérez Jiménez, José LuisChertOpalSilicificationMg-smectitePhreatic-vadose environmentsThe research during the construction of the M-50 highway has allowed the study of the silica levels that constitute the most important Neolithic flint mine in the Iberian Peninsula. A group of more than 3.800 extraction pits were realized to obtain cherts and opals that appear among Mg smectites beds (Aragonian deposits). The description of the nodular and stratiform silica levels and the study of their types and distribution have been done at geological sections obtained during the archaeological excavations. Three petrological types of siliceous rocks (chert, opal and opaline chert) are established and defined according to their mineralogy and microfacies. Cherts are constituted only by quartz and locally minor amounts of moganite. Opals contain opal CT, Mg smectites and minor quartz. Opaline chert is defined when the proportion of quartz is higher than 50%. All the types of siliceous rocks reproduce bioturbation structures as well as other structures found in the host rocks (grains, intraclasts, brecciation). The silica levels at the base of the columns are constituted only by chert and were formed by the silicification of nodular and lenticular dolomite levels included in the Mg-smectites beds. The rest of the siliceous levels are composed of opals and opaline cherts and were formed by silicification of Mg-smectites. The outer part of the opaline chert has a higher content in opal and clay relicts whereas the inner part is mainly microcrystalline quartz. This change is consequence of the recrystallization of the opal (aging) producing a more compact silica rock. The main silicification occurred under the groundwater table because the structure of the host rocks is conserved in the silica rocks. A general question is whether the silica that precipites is introduced by groundwater or it is released from the dissolution of clays during their replacementSociedad Geológica de España20052005-01-0120052005-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10272/8693reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelvainstname:Universidad de Huelva (UHU)Españolspaopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:ariasmontano.uhu.es:10272/86932026-06-02T14:58:11Z
dc.title.none.fl_str_mv Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid)
Differential features and genesis of silica levels mined in the Casa Montero archaeological site. (Vicálvaro, Madrid)
title Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid)
spellingShingle Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid)
Bustillo Revuelta, María Ángeles
Chert
Opal
Silicification
Mg-smectite
Phreatic-vadose environments
title_short Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid)
title_full Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid)
title_fullStr Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid)
title_full_unstemmed Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid)
title_sort Características diferenciales y génesis de los niveles silíceos explotados en el yacimiento arqueológico de Casa Montero (Vicálvaro, Madrid)
dc.creator.none.fl_str_mv Bustillo Revuelta, María Ángeles
Pérez Jiménez, José Luis
author Bustillo Revuelta, María Ángeles
author_facet Bustillo Revuelta, María Ángeles
Pérez Jiménez, José Luis
author_role author
author2 Pérez Jiménez, José Luis
author2_role author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv Chert
Opal
Silicification
Mg-smectite
Phreatic-vadose environments
topic Chert
Opal
Silicification
Mg-smectite
Phreatic-vadose environments
description The research during the construction of the M-50 highway has allowed the study of the silica levels that constitute the most important Neolithic flint mine in the Iberian Peninsula. A group of more than 3.800 extraction pits were realized to obtain cherts and opals that appear among Mg smectites beds (Aragonian deposits). The description of the nodular and stratiform silica levels and the study of their types and distribution have been done at geological sections obtained during the archaeological excavations. Three petrological types of siliceous rocks (chert, opal and opaline chert) are established and defined according to their mineralogy and microfacies. Cherts are constituted only by quartz and locally minor amounts of moganite. Opals contain opal CT, Mg smectites and minor quartz. Opaline chert is defined when the proportion of quartz is higher than 50%. All the types of siliceous rocks reproduce bioturbation structures as well as other structures found in the host rocks (grains, intraclasts, brecciation). The silica levels at the base of the columns are constituted only by chert and were formed by the silicification of nodular and lenticular dolomite levels included in the Mg-smectites beds. The rest of the siliceous levels are composed of opals and opaline cherts and were formed by silicification of Mg-smectites. The outer part of the opaline chert has a higher content in opal and clay relicts whereas the inner part is mainly microcrystalline quartz. This change is consequence of the recrystallization of the opal (aging) producing a more compact silica rock. The main silicification occurred under the groundwater table because the structure of the host rocks is conserved in the silica rocks. A general question is whether the silica that precipites is introduced by groundwater or it is released from the dissolution of clays during their replacement
publishDate 2005
dc.date.none.fl_str_mv 2005
2005-01-01
2005
2005-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10272/8693
url http://hdl.handle.net/10272/8693
dc.language.none.fl_str_mv Español
spa
language_invalid_str_mv Español
language spa
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Sociedad Geológica de España
publisher.none.fl_str_mv Sociedad Geológica de España
dc.source.none.fl_str_mv reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelva
instname:Universidad de Huelva (UHU)
instname_str Universidad de Huelva (UHU)
reponame_str Arias Montano. Repositorio Institucional de la Universidad de Huelva
collection Arias Montano. Repositorio Institucional de la Universidad de Huelva
repository.name.fl_str_mv
repository.mail.fl_str_mv
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