Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications

Autores
Fazio, Ana Maria; Scasso, Roberto Adrian; Castro, Liliana Norma; Carey, S.
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Phosphatic concretions in the Early Miocene, shallow marine, clastic deposits of the Gaiman Formation (Gaiman Fm.) show typical major element ratios, rare earth element (REE) patterns, and total REE contents. These characteristics are similar within different stratigraphic levels and geographic locations of the unit in central-north Patagonia, Argentina and suggest a common process for the origin of the concretions. Major element oxides in concretions are grouped into a "clastic" group (Si, Al, Ti, K and Fe), that mostly corresponds to the silicates in the terrigenous fraction, and an "authigenic" group (P, Ca and total REEs), that corresponds to authigenic francolite and calcite. Mn is the only element that exhibits a separate behavior, most likely because of its high mobility in seawater. Major element ratios in host shales are similar to those of the clastic fraction within the concretions and coquinas. Concretions are slightly depleted in LREEs and slightly enriched in HREEs in comparison to shales and display a weak negative Ce anomaly. Their La/Yb and La/Sm ratios indicate REEs incorporation from pore water without strong postdepositional recrystallization or strong adsorption. Y anomalies and La/Nd ratios in concretions are equivalent to seawater or slightly lower, suggesting that Gaiman concretions did not undergo intense diagenesis, but they were probably formed from phosphatic solutions impoverished in Y and La as a result of REEs release to solution from organic complexes in the early diagenesis. Flat, linear REE patterns also support an early-diagenetic origin for the concretions, via quantitative precipitation of phosphate from oxic-suboxic pore waters. Water circulation through burrows at the Miocene seawater-sediment interface improved ion diffusion and pore water renewal in the sediments, allowing the development of a widened early-diagenetic oxic-suboxic zone and the precipitation of phosphate with a homogeneous REE pattern.
Fil: Fazio, Ana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Scasso, Roberto Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Castro, Liliana Norma. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina
Fil: Carey, S.. University Of Rhode Island; Estados Unidos
Materia
Argentina
Concretions
Miocene
Patagonia
Phosphate
Phosphogenesis
Rare Earth Elements
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/77993
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/77993
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implicationsFazio, Ana MariaScasso, Roberto AdrianCastro, Liliana NormaCarey, S.ArgentinaConcretionsMiocenePatagoniaPhosphatePhosphogenesisRare Earth Elementshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Phosphatic concretions in the Early Miocene, shallow marine, clastic deposits of the Gaiman Formation (Gaiman Fm.) show typical major element ratios, rare earth element (REE) patterns, and total REE contents. These characteristics are similar within different stratigraphic levels and geographic locations of the unit in central-north Patagonia, Argentina and suggest a common process for the origin of the concretions. Major element oxides in concretions are grouped into a "clastic" group (Si, Al, Ti, K and Fe), that mostly corresponds to the silicates in the terrigenous fraction, and an "authigenic" group (P, Ca and total REEs), that corresponds to authigenic francolite and calcite. Mn is the only element that exhibits a separate behavior, most likely because of its high mobility in seawater. Major element ratios in host shales are similar to those of the clastic fraction within the concretions and coquinas. Concretions are slightly depleted in LREEs and slightly enriched in HREEs in comparison to shales and display a weak negative Ce anomaly. Their La/Yb and La/Sm ratios indicate REEs incorporation from pore water without strong postdepositional recrystallization or strong adsorption. Y anomalies and La/Nd ratios in concretions are equivalent to seawater or slightly lower, suggesting that Gaiman concretions did not undergo intense diagenesis, but they were probably formed from phosphatic solutions impoverished in Y and La as a result of REEs release to solution from organic complexes in the early diagenesis. Flat, linear REE patterns also support an early-diagenetic origin for the concretions, via quantitative precipitation of phosphate from oxic-suboxic pore waters. Water circulation through burrows at the Miocene seawater-sediment interface improved ion diffusion and pore water renewal in the sediments, allowing the development of a widened early-diagenetic oxic-suboxic zone and the precipitation of phosphate with a homogeneous REE pattern.Fil: Fazio, Ana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Scasso, Roberto Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Castro, Liliana Norma. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; ArgentinaFil: Carey, S.. University Of Rhode Island; Estados UnidosPergamon-Elsevier Science Ltd2007-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/77993Fazio, Ana Maria; Scasso, Roberto Adrian; Castro, Liliana Norma; Carey, S.; Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications; Pergamon-Elsevier Science Ltd; Deep Sea Research Part II: Topical Studies in Oceanography; 54; 11-13; 6-2007; 1414-14320967-0645CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr2.2007.04.013info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S096706450700104Xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:12:27Zoai:ri.conicet.gov.ar:11336/77993instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:12:27.517CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications
title Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications
spellingShingle Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications
Fazio, Ana Maria
Argentina
Concretions
Miocene
Patagonia
Phosphate
Phosphogenesis
Rare Earth Elements
title_short Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications
title_full Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications
title_fullStr Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications
title_full_unstemmed Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications
title_sort Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications
dc.creator.none.fl_str_mv Fazio, Ana Maria
Scasso, Roberto Adrian
Castro, Liliana Norma
Carey, S.
author Fazio, Ana Maria
author_facet Fazio, Ana Maria
Scasso, Roberto Adrian
Castro, Liliana Norma
Carey, S.
author_role author
author2 Scasso, Roberto Adrian
Castro, Liliana Norma
Carey, S.
author2_role author
author
author
dc.subject.none.fl_str_mv Argentina
Concretions
Miocene
Patagonia
Phosphate
Phosphogenesis
Rare Earth Elements
topic Argentina
Concretions
Miocene
Patagonia
Phosphate
Phosphogenesis
Rare Earth Elements
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Phosphatic concretions in the Early Miocene, shallow marine, clastic deposits of the Gaiman Formation (Gaiman Fm.) show typical major element ratios, rare earth element (REE) patterns, and total REE contents. These characteristics are similar within different stratigraphic levels and geographic locations of the unit in central-north Patagonia, Argentina and suggest a common process for the origin of the concretions. Major element oxides in concretions are grouped into a "clastic" group (Si, Al, Ti, K and Fe), that mostly corresponds to the silicates in the terrigenous fraction, and an "authigenic" group (P, Ca and total REEs), that corresponds to authigenic francolite and calcite. Mn is the only element that exhibits a separate behavior, most likely because of its high mobility in seawater. Major element ratios in host shales are similar to those of the clastic fraction within the concretions and coquinas. Concretions are slightly depleted in LREEs and slightly enriched in HREEs in comparison to shales and display a weak negative Ce anomaly. Their La/Yb and La/Sm ratios indicate REEs incorporation from pore water without strong postdepositional recrystallization or strong adsorption. Y anomalies and La/Nd ratios in concretions are equivalent to seawater or slightly lower, suggesting that Gaiman concretions did not undergo intense diagenesis, but they were probably formed from phosphatic solutions impoverished in Y and La as a result of REEs release to solution from organic complexes in the early diagenesis. Flat, linear REE patterns also support an early-diagenetic origin for the concretions, via quantitative precipitation of phosphate from oxic-suboxic pore waters. Water circulation through burrows at the Miocene seawater-sediment interface improved ion diffusion and pore water renewal in the sediments, allowing the development of a widened early-diagenetic oxic-suboxic zone and the precipitation of phosphate with a homogeneous REE pattern.
Fil: Fazio, Ana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Scasso, Roberto Adrian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Castro, Liliana Norma. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina
Fil: Carey, S.. University Of Rhode Island; Estados Unidos
description Phosphatic concretions in the Early Miocene, shallow marine, clastic deposits of the Gaiman Formation (Gaiman Fm.) show typical major element ratios, rare earth element (REE) patterns, and total REE contents. These characteristics are similar within different stratigraphic levels and geographic locations of the unit in central-north Patagonia, Argentina and suggest a common process for the origin of the concretions. Major element oxides in concretions are grouped into a "clastic" group (Si, Al, Ti, K and Fe), that mostly corresponds to the silicates in the terrigenous fraction, and an "authigenic" group (P, Ca and total REEs), that corresponds to authigenic francolite and calcite. Mn is the only element that exhibits a separate behavior, most likely because of its high mobility in seawater. Major element ratios in host shales are similar to those of the clastic fraction within the concretions and coquinas. Concretions are slightly depleted in LREEs and slightly enriched in HREEs in comparison to shales and display a weak negative Ce anomaly. Their La/Yb and La/Sm ratios indicate REEs incorporation from pore water without strong postdepositional recrystallization or strong adsorption. Y anomalies and La/Nd ratios in concretions are equivalent to seawater or slightly lower, suggesting that Gaiman concretions did not undergo intense diagenesis, but they were probably formed from phosphatic solutions impoverished in Y and La as a result of REEs release to solution from organic complexes in the early diagenesis. Flat, linear REE patterns also support an early-diagenetic origin for the concretions, via quantitative precipitation of phosphate from oxic-suboxic pore waters. Water circulation through burrows at the Miocene seawater-sediment interface improved ion diffusion and pore water renewal in the sediments, allowing the development of a widened early-diagenetic oxic-suboxic zone and the precipitation of phosphate with a homogeneous REE pattern.
publishDate 2007
dc.date.none.fl_str_mv 2007-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/77993
Fazio, Ana Maria; Scasso, Roberto Adrian; Castro, Liliana Norma; Carey, S.; Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications; Pergamon-Elsevier Science Ltd; Deep Sea Research Part II: Topical Studies in Oceanography; 54; 11-13; 6-2007; 1414-1432
0967-0645
CONICET Digital
CONICET
url http://hdl.handle.net/11336/77993
identifier_str_mv Fazio, Ana Maria; Scasso, Roberto Adrian; Castro, Liliana Norma; Carey, S.; Geochemistry of rare earth elements in early-diagenetic miocene phosphatic concretions of Patagonia, Argentina: Phosphogenetic implications; Pergamon-Elsevier Science Ltd; Deep Sea Research Part II: Topical Studies in Oceanography; 54; 11-13; 6-2007; 1414-1432
0967-0645
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr2.2007.04.013
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S096706450700104X
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.993085

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