Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina

Autores
Gómez Peral, Lucia; Kaufman, Alan J.; Poire, Daniel Gustavo
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Two phosphogenic events of potential economic importance (preserving P2O5 abundances up to 25 and 35%, respectively) are recognized in the Neoproterozoic Tandilia System. The older of the two lies atop a quartz-arkosic facies association of the Villa Mónica Formation. The age of this unit remains controversial, but has previously been considered as Tonian to Cryogenian based on stromatolite assemblages and carbon isotope trends; strontium isotope abundances of <0.7071 currently support an earliest Cryogenian age for the formation. The younger phosphate level lies at the base of the Cerro Negro Formation above a widespread karstic surface in a succession containing Cloudina, so is most-likely to be Ediacaran in age. In both cases, the phosphatic concretionary levels are related to relative sea-level fall and exposure that may be related to glacial eustacy. In order to reconstruct the paleoenvironment associated with the formation of these concretionary phosphates, we combined field observations with thin-section petrography, XRD, SEM and geochemical analyses. Total rare-earth element (REE) contents range from 311 to 1010 ppm in concretions from the Villa Mónica Formation and from 290 to 1471 ppm those from the Cerro Negro Formation. Villa Mónica concretions reveal no anomalies in Ce abundance, but clearly positive Eu anomalies (ranging from 1 to 1.4). These results suggest reduced conditions in the marine depositional environment. In contrast, Eu anomalies are not recorded in Cerro Negro concretions, while negative Ce anomalies, ranging from −0.14 to −0.18, are noted. These results are consistent with oxic seawater conditions in mixed platform facies. This study suggests that depositional conditions where phosphate was concentrated in the Neoproterozoic Tandilla System were markedly different
Fil: Gómez Peral, Lucia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Kaufman, Alan J.. University of Maryland; Estados Unidos
Fil: Poire, Daniel Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Materia
Phosphate Concretions
Ree
Sierras Bayas Group
Neoproterozoic
Río de La Plata Craton
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:11336/33125
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/33125
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, ArgentinaGómez Peral, LuciaKaufman, Alan J.Poire, Daniel GustavoPhosphate ConcretionsReeSierras Bayas GroupNeoproterozoicRío de La Plata Cratonhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Two phosphogenic events of potential economic importance (preserving P2O5 abundances up to 25 and 35%, respectively) are recognized in the Neoproterozoic Tandilia System. The older of the two lies atop a quartz-arkosic facies association of the Villa Mónica Formation. The age of this unit remains controversial, but has previously been considered as Tonian to Cryogenian based on stromatolite assemblages and carbon isotope trends; strontium isotope abundances of <0.7071 currently support an earliest Cryogenian age for the formation. The younger phosphate level lies at the base of the Cerro Negro Formation above a widespread karstic surface in a succession containing Cloudina, so is most-likely to be Ediacaran in age. In both cases, the phosphatic concretionary levels are related to relative sea-level fall and exposure that may be related to glacial eustacy. In order to reconstruct the paleoenvironment associated with the formation of these concretionary phosphates, we combined field observations with thin-section petrography, XRD, SEM and geochemical analyses. Total rare-earth element (REE) contents range from 311 to 1010 ppm in concretions from the Villa Mónica Formation and from 290 to 1471 ppm those from the Cerro Negro Formation. Villa Mónica concretions reveal no anomalies in Ce abundance, but clearly positive Eu anomalies (ranging from 1 to 1.4). These results suggest reduced conditions in the marine depositional environment. In contrast, Eu anomalies are not recorded in Cerro Negro concretions, while negative Ce anomalies, ranging from −0.14 to −0.18, are noted. These results are consistent with oxic seawater conditions in mixed platform facies. This study suggests that depositional conditions where phosphate was concentrated in the Neoproterozoic Tandilla System were markedly differentFil: Gómez Peral, Lucia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaFil: Kaufman, Alan J.. University of Maryland; Estados UnidosFil: Poire, Daniel Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaElsevier Science2014-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/33125Kaufman, Alan J.; Poire, Daniel Gustavo; Gómez Peral, Lucia; Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina; Elsevier Science; Precambrian Research; 252; 7-2014; 88-1060301-9268CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.precamres.2014.07.009info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0301926814002563info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:03:49Zoai:ri.conicet.gov.ar:11336/33125instacron: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:34982025-09-03 10:03:50.083CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina
title Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina
spellingShingle Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina
Gómez Peral, Lucia
Phosphate Concretions
Ree
Sierras Bayas Group
Neoproterozoic
Río de La Plata Craton
title_short Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina
title_full Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina
title_fullStr Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina
title_full_unstemmed Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina
title_sort Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina
dc.creator.none.fl_str_mv Gómez Peral, Lucia
Kaufman, Alan J.
Poire, Daniel Gustavo
author Gómez Peral, Lucia
author_facet Gómez Peral, Lucia
Kaufman, Alan J.
Poire, Daniel Gustavo
author_role author
author2 Kaufman, Alan J.
Poire, Daniel Gustavo
author2_role author
author
dc.subject.none.fl_str_mv Phosphate Concretions
Ree
Sierras Bayas Group
Neoproterozoic
Río de La Plata Craton
topic Phosphate Concretions
Ree
Sierras Bayas Group
Neoproterozoic
Río de La Plata Craton
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Two phosphogenic events of potential economic importance (preserving P2O5 abundances up to 25 and 35%, respectively) are recognized in the Neoproterozoic Tandilia System. The older of the two lies atop a quartz-arkosic facies association of the Villa Mónica Formation. The age of this unit remains controversial, but has previously been considered as Tonian to Cryogenian based on stromatolite assemblages and carbon isotope trends; strontium isotope abundances of <0.7071 currently support an earliest Cryogenian age for the formation. The younger phosphate level lies at the base of the Cerro Negro Formation above a widespread karstic surface in a succession containing Cloudina, so is most-likely to be Ediacaran in age. In both cases, the phosphatic concretionary levels are related to relative sea-level fall and exposure that may be related to glacial eustacy. In order to reconstruct the paleoenvironment associated with the formation of these concretionary phosphates, we combined field observations with thin-section petrography, XRD, SEM and geochemical analyses. Total rare-earth element (REE) contents range from 311 to 1010 ppm in concretions from the Villa Mónica Formation and from 290 to 1471 ppm those from the Cerro Negro Formation. Villa Mónica concretions reveal no anomalies in Ce abundance, but clearly positive Eu anomalies (ranging from 1 to 1.4). These results suggest reduced conditions in the marine depositional environment. In contrast, Eu anomalies are not recorded in Cerro Negro concretions, while negative Ce anomalies, ranging from −0.14 to −0.18, are noted. These results are consistent with oxic seawater conditions in mixed platform facies. This study suggests that depositional conditions where phosphate was concentrated in the Neoproterozoic Tandilla System were markedly different
Fil: Gómez Peral, Lucia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Fil: Kaufman, Alan J.. University of Maryland; Estados Unidos
Fil: Poire, Daniel Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
description Two phosphogenic events of potential economic importance (preserving P2O5 abundances up to 25 and 35%, respectively) are recognized in the Neoproterozoic Tandilia System. The older of the two lies atop a quartz-arkosic facies association of the Villa Mónica Formation. The age of this unit remains controversial, but has previously been considered as Tonian to Cryogenian based on stromatolite assemblages and carbon isotope trends; strontium isotope abundances of <0.7071 currently support an earliest Cryogenian age for the formation. The younger phosphate level lies at the base of the Cerro Negro Formation above a widespread karstic surface in a succession containing Cloudina, so is most-likely to be Ediacaran in age. In both cases, the phosphatic concretionary levels are related to relative sea-level fall and exposure that may be related to glacial eustacy. In order to reconstruct the paleoenvironment associated with the formation of these concretionary phosphates, we combined field observations with thin-section petrography, XRD, SEM and geochemical analyses. Total rare-earth element (REE) contents range from 311 to 1010 ppm in concretions from the Villa Mónica Formation and from 290 to 1471 ppm those from the Cerro Negro Formation. Villa Mónica concretions reveal no anomalies in Ce abundance, but clearly positive Eu anomalies (ranging from 1 to 1.4). These results suggest reduced conditions in the marine depositional environment. In contrast, Eu anomalies are not recorded in Cerro Negro concretions, while negative Ce anomalies, ranging from −0.14 to −0.18, are noted. These results are consistent with oxic seawater conditions in mixed platform facies. This study suggests that depositional conditions where phosphate was concentrated in the Neoproterozoic Tandilla System were markedly different
publishDate 2014
dc.date.none.fl_str_mv 2014-07
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/11336/33125
Kaufman, Alan J.; Poire, Daniel Gustavo; Gómez Peral, Lucia; Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina; Elsevier Science; Precambrian Research; 252; 7-2014; 88-106
0301-9268
CONICET Digital
CONICET
url http://hdl.handle.net/11336/33125
identifier_str_mv Kaufman, Alan J.; Poire, Daniel Gustavo; Gómez Peral, Lucia; Paleoenvironmental implications of two phosphogenic events in Neoproterozoic sedimentary successions of the Tandilia System, Argentina; Elsevier Science; Precambrian Research; 252; 7-2014; 88-106
0301-9268
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.precamres.2014.07.009
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0301926814002563
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
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
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 13.13397

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