Color, Mineralogy and Composition of Upper Jurassic West Siberian Glauconite: Useful Indicators of Paleoenvironment

20 páginas, 12 figuras, 2 tablas.

Detalhes bibliográficos
Autores: Sánchez-Navas, A., Martín-Algarra, Agustín, Eder, Vika G., Jagannadha-Reddy, B., Nieto, F., Zanin, Yuri N.
Formato: artículo
Fecha de publicación:2008
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/28887
Acesso em linha:http://hdl.handle.net/10261/28887
Access Level:acceso abierto
Palavra-chave:Glauconite
Color
Composition
Maturation
Alterations
Georgiev formation
West Siberian basin
Russia
Couleur
Altérations
Formation de Georgiev
Bassin Sibérien Occidental
Russie
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oai_identifier_str oai:digital.csic.es:10261/28887
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Color, Mineralogy and Composition of Upper Jurassic West Siberian Glauconite: Useful Indicators of Paleoenvironment
title Color, Mineralogy and Composition of Upper Jurassic West Siberian Glauconite: Useful Indicators of Paleoenvironment
spellingShingle Color, Mineralogy and Composition of Upper Jurassic West Siberian Glauconite: Useful Indicators of Paleoenvironment
Sánchez-Navas, A.
Glauconite
Color
Composition
Maturation
Alterations
Georgiev formation
West Siberian basin
Russia
Couleur
Altérations
Formation de Georgiev
Bassin Sibérien Occidental
Russie
title_short Color, Mineralogy and Composition of Upper Jurassic West Siberian Glauconite: Useful Indicators of Paleoenvironment
title_full Color, Mineralogy and Composition of Upper Jurassic West Siberian Glauconite: Useful Indicators of Paleoenvironment
title_fullStr Color, Mineralogy and Composition of Upper Jurassic West Siberian Glauconite: Useful Indicators of Paleoenvironment
title_full_unstemmed Color, Mineralogy and Composition of Upper Jurassic West Siberian Glauconite: Useful Indicators of Paleoenvironment
title_sort Color, Mineralogy and Composition of Upper Jurassic West Siberian Glauconite: Useful Indicators of Paleoenvironment
dc.creator.none.fl_str_mv Sánchez-Navas, A.
Martín-Algarra, Agustín
Eder, Vika G.
Jagannadha-Reddy, B.
Nieto, F.
Zanin, Yuri N.
author Sánchez-Navas, A.
author_facet Sánchez-Navas, A.
Martín-Algarra, Agustín
Eder, Vika G.
Jagannadha-Reddy, B.
Nieto, F.
Zanin, Yuri N.
author_role author
author2 Martín-Algarra, Agustín
Eder, Vika G.
Jagannadha-Reddy, B.
Nieto, F.
Zanin, Yuri N.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Glauconite
Color
Composition
Maturation
Alterations
Georgiev formation
West Siberian basin
Russia
Couleur
Altérations
Formation de Georgiev
Bassin Sibérien Occidental
Russie
topic Glauconite
Color
Composition
Maturation
Alterations
Georgiev formation
West Siberian basin
Russia
Couleur
Altérations
Formation de Georgiev
Bassin Sibérien Occidental
Russie
description 20 páginas, 12 figuras, 2 tablas.
publishDate 2008
dc.date.none.fl_str_mv 2008
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/10261/28887
url http://hdl.handle.net/10261/28887
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.3749/canmin.46.5.1249
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Mineralogical Association of Canada
publisher.none.fl_str_mv Mineralogical Association of Canada
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
_version_ 1869409018516078592
spelling Color, Mineralogy and Composition of Upper Jurassic West Siberian Glauconite: Useful Indicators of PaleoenvironmentSánchez-Navas, A.Martín-Algarra, AgustínEder, Vika G.Jagannadha-Reddy, B.Nieto, F.Zanin, Yuri N.GlauconiteColorCompositionMaturationAlterationsGeorgiev formationWest Siberian basinRussiaCouleurAltérationsFormation de GeorgievBassin Sibérien OccidentalRussie20 páginas, 12 figuras, 2 tablas.[EN] Changes in color of Upper Jurassic glauconite of the Georgiev Formation, in the West Siberian Basin, in Russia, are related to changes in physicochemical conditions that caused glauconite maturation and alteration, driven by regional paleoenvironmental evolution. Maturation produces dark green (bluish) glauconite formed from Fe-rich smectite by increasing the content of Fe2+ together with K. Alteration produces brown rims and cracks that are enriched in Al and depleted in Fe and K with respect to the glauconite cores. The change from a yellowish green to dark green color in progressively more mature glauconite is explained by light absorption induced by enrichment in octahedrally coordinated Fe2+ relative to the total Fe, associated with the progressive decrease in the proportion of Fe3+-rich smectite interleaved with glauconite. The brown color in alteration rims is due essentially to light scattered by nanometric inclusions of Fe oxyhydroxides. These, together with residual Al-rich glauconite and a subordinate Fe-rich smectite, constitute reaction products formed by leaching of K and Fe2+, and by the oxidation of yellowish green glauconite cores. Berthierine formed later in the brown rims on Al-rich glauconite, and pyrite formed as a result of drowning of the platform during the latest Jurassic – earliest Cretaceous and sedimentation of black shales under increasingly reducing conditions.[FR] Les changements en couleur de la glauconite de la Formation de Georgiev, d’âge jurassique supérieur, dans le bassin Sibérien Occidental, en Russie, sont liés aux changements des conditions physicochimiques qui ont provoqué la maturation et l’altération de la glauconite, conditions régies par l’évolution du milieu paléo-environnemental. La maturation a produit une couleur vert foncé (bleuâtre) de la glauconite formée aux dépens de la smectite ferrifère par augmentation de la teneur en Fe2+ et en potassium. L’altération a produit une bordure brune et des craquelures qui sont enrichies en Al et appauvries en Fe et K par rapport aux noyaux de glauconite. Le changement de couleur, de vert jaunâtre à vert foncé dans la glauconite progressivement plus mature, serait dû à l’absorption de la lumière induite par enrichissement du Fe2+ en coordinence octaédrique par rapport au fer total, ainsi que la diminution progressive de la proportion de smectite riche en Fe3+ en intercalation avec la glauconite. La couleur brune des lisérés d’altération serait due surtout à la dispersion de la lumière par des inclusions nanométriques d’oxyhydroxides de fer. Ces particules, ainsi que la glauconite résiduelle riche en Al et une proportion subordonnée de smectite riche en fer, constituent les produits de réaction formés par lessivage de K et Fe2+, et par l’oxydation des noyaux de glauconite vert jaunâtre. La berthierine s’est formée plus tard sur les bordures brunes des grains de glauconite alumineuse, et la pyrite s’est formée lors d’une submersion de la platteforme à la fin du Jurassique et au début du Crétacé, et de la sédimentation de shales noirs qui s’en suivit sous conditions de plus en plus réductrices.Vika Eder benefitted from the INTAS grant YSF 2002–108 during her stay in the University of Granada in April–May 2003. This work is a contribution of Research Group 164 (4089) of the Junta de Andalucía, and was financed by Research Projects BT2001–2852, (S.E.U.I.D.–M.C.T., Spain), BTE 2003–07867–CO2–O1 (S.E.U.I.D.–M.C.T., Spain) and CGL2005–03887 (S.E.P.C.T., M.E.C., Spain).Peer reviewedMineralogical Association of Canada201020102008info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/28887reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.3749/canmin.46.5.1249info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/288872026-05-22T06:33:51Z
score 15,198674

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