Evolution of illite/smectite from early diagenesis through incipient metamorphism in sediments of the Basque-Cantabrian Basin

20 páginas, 10 figuras, 5 tablas.

Detalhes bibliográficos
Autores: Nieto, F., Ortega-Huertas, M., Peacor, D. R., Arostegui, Javier
Formato: artículo
Fecha de publicación:1996
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/28817
Acesso em linha:http://hdl.handle.net/10261/28817
Access Level:acceso abierto
Palavra-chave:Basque Cantabrian Basin
Diagenesis
Illite
Smectite
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spelling Evolution of illite/smectite from early diagenesis through incipient metamorphism in sediments of the Basque-Cantabrian BasinNieto, F.Ortega-Huertas, M.Peacor, D. R.Arostegui, JavierBasque Cantabrian BasinDiagenesisIlliteSmectite20 páginas, 10 figuras, 5 tablas.Prograde evolution of illite/smectite occurring in an unusually-thick (8000 m) sequence of Mesozoic-Cenozoic sediments in the Basque-Cantabrian Basin, Spain, has been studied using XRD and TEM/AEM. The sediments, which are only slightly tilted, cover the range from smectite to illite, and the most deeply buried ones are unique in that they span the range from diagenesis through low-grade metamorphism (anchizone), with no apparent overprinting due to tectonic deformation. Pelites are absent from the shallow section, but smectite occurs in marls as high-charge, K-dominant and low-charge, K-poor anastomosing arrays of layers. At intermediate depths, authigenic clay is identified largely as R1 I/S, coexisting with packets of R>>3 I/S (nearly pure illite), where illite-like and smectitelike layers can be identified by contrast in TEM images, which is consistent with XRD data. The authigenic clay of the deepest samples consists of illite with no or almost no expandable layers, which occurred as packets with layers largely subparallel !o bedding, K-deficient composition in comparison with muscovite, 1Md-like SAED patterns, and 100 A mean packet thickness. There is no evidence of deformation stress-induced, non-bedding-parallel clays in the deepest samples. Detrital micas with either a phengiterich or a phengite-poor composition range dominate the phyllosilicate fraction of al1 the samples. Detrital micas show no changes over the diagenesis/metamorphism range and appear to have behaved as if isolated from authigenic clays. Authigenic clays occur as bedding-subparallel packets that evolved dunng passive burial metamorphism through dissolution/crystallization of less-evolved clays. Where illite-like and smectite-like layers can be identified, TEM images imply a discontinuous series in which packets of R1 I/S (50% I) transform to packets of nearly-pure illite, that is, an Ostwald-step-mle-like sequence. Such immature illite remains unmodified with further burial, and is apparently the potential predecessor of stress-induced, highlyevolved mica of higher-grade, tectonically-deformed pelites.This paper has been supported by Projects PB92-0961, PB92-0960 and BE90-234 grant to F. Nieto (DGICYT, Spain), Research Group of the Junta de Andalucía no. 4065 and NSF grant EAR-9104565 to D.R. Peacor.Peer reviewedClay Minerals Society201020101996info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/28817reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://ccm.geoscienceworld.org/cgi/content/abstract/44/3/304info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/288172026-05-22T06:33:51Z
dc.title.none.fl_str_mv Evolution of illite/smectite from early diagenesis through incipient metamorphism in sediments of the Basque-Cantabrian Basin
title Evolution of illite/smectite from early diagenesis through incipient metamorphism in sediments of the Basque-Cantabrian Basin
spellingShingle Evolution of illite/smectite from early diagenesis through incipient metamorphism in sediments of the Basque-Cantabrian Basin
Nieto, F.
Basque Cantabrian Basin
Diagenesis
Illite
Smectite
title_short Evolution of illite/smectite from early diagenesis through incipient metamorphism in sediments of the Basque-Cantabrian Basin
title_full Evolution of illite/smectite from early diagenesis through incipient metamorphism in sediments of the Basque-Cantabrian Basin
title_fullStr Evolution of illite/smectite from early diagenesis through incipient metamorphism in sediments of the Basque-Cantabrian Basin
title_full_unstemmed Evolution of illite/smectite from early diagenesis through incipient metamorphism in sediments of the Basque-Cantabrian Basin
title_sort Evolution of illite/smectite from early diagenesis through incipient metamorphism in sediments of the Basque-Cantabrian Basin
dc.creator.none.fl_str_mv Nieto, F.
Ortega-Huertas, M.
Peacor, D. R.
Arostegui, Javier
author Nieto, F.
author_facet Nieto, F.
Ortega-Huertas, M.
Peacor, D. R.
Arostegui, Javier
author_role author
author2 Ortega-Huertas, M.
Peacor, D. R.
Arostegui, Javier
author2_role author
author
author
dc.subject.none.fl_str_mv Basque Cantabrian Basin
Diagenesis
Illite
Smectite
topic Basque Cantabrian Basin
Diagenesis
Illite
Smectite
description 20 páginas, 10 figuras, 5 tablas.
publishDate 1996
dc.date.none.fl_str_mv 1996
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/10261/28817
url http://hdl.handle.net/10261/28817
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://ccm.geoscienceworld.org/cgi/content/abstract/44/3/304
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Clay Minerals Society
publisher.none.fl_str_mv Clay Minerals Society
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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score 15,812455

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