The sieve lobe paradigm: Observations of active deposition

Autores
Milana, Juan Pablo
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Sieve deposits were once considered to be one of the building blocks in alluvial fan stratigraphy. Later re-interpretation of sieve lobes as debris-flow deposits, favored because no visual records of active sieve deposition had been reported, undermined its significance, divided opinions, and left this issue unresolved. Here, I document active deposition of sieve lobes in natural settings, supporting the original model. Sieve deposition can easily occur in natural settings such as proglacial outwash fans, small arid alluvial fans, or perennial streams when there is a scarcity of fine material, significant bedload, high slope, permeable ground and discharges moderate enough to allow infiltration. The only hydrodynamic requirement for sieve deposition is a high rate of water loss promoted by permeable bed sediments.. Under some circumstances alluvial fans can be built almost entirely of sieve deposits as shown here. One effect of the rapid extraction of water is the creation of sigmoidal fan profiles. A gradation from sieve deposition to sheetflood occurs if sediment becomes progressively less permeable or if water flow increases, overcoming bed permeability. Sieve deposition is a universal depositional process based simply on infiltration, and it explains matrix-poor clast-supported gravels, while alternative hypotheses, such as matrix winnowing of debris flows used to dispute the sieve model, need yet to be proven by observations in nature.
Fil: Milana, Juan Pablo. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
Materia
alluvial fan
sieve lobe
gravel
sedimentology
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:11336/101758
Acceder
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spelling The sieve lobe paradigm: Observations of active depositionMilana, Juan Pabloalluvial fansieve lobegravelsedimentologyhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Sieve deposits were once considered to be one of the building blocks in alluvial fan stratigraphy. Later re-interpretation of sieve lobes as debris-flow deposits, favored because no visual records of active sieve deposition had been reported, undermined its significance, divided opinions, and left this issue unresolved. Here, I document active deposition of sieve lobes in natural settings, supporting the original model. Sieve deposition can easily occur in natural settings such as proglacial outwash fans, small arid alluvial fans, or perennial streams when there is a scarcity of fine material, significant bedload, high slope, permeable ground and discharges moderate enough to allow infiltration. The only hydrodynamic requirement for sieve deposition is a high rate of water loss promoted by permeable bed sediments.. Under some circumstances alluvial fans can be built almost entirely of sieve deposits as shown here. One effect of the rapid extraction of water is the creation of sigmoidal fan profiles. A gradation from sieve deposition to sheetflood occurs if sediment becomes progressively less permeable or if water flow increases, overcoming bed permeability. Sieve deposition is a universal depositional process based simply on infiltration, and it explains matrix-poor clast-supported gravels, while alternative hypotheses, such as matrix winnowing of debris flows used to dispute the sieve model, need yet to be proven by observations in nature.Fil: Milana, Juan Pablo. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; ArgentinaGeological Society of America2010-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/101758Milana, Juan Pablo; The sieve lobe paradigm: Observations of active deposition; Geological Society of America; Geology; 38; 3; 4-2010; 207-2100091-7613CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://doi.org/10.1130/G30504.1info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsa/geology/article-abstract/38/3/207/130175/The-sieve-lobe-paradigm-Observations-of-activeinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:25:46Zoai:ri.conicet.gov.ar:11336/101758instacron: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:34982025-09-29 10:25:46.385CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The sieve lobe paradigm: Observations of active deposition
title The sieve lobe paradigm: Observations of active deposition
spellingShingle The sieve lobe paradigm: Observations of active deposition
Milana, Juan Pablo
alluvial fan
sieve lobe
gravel
sedimentology
title_short The sieve lobe paradigm: Observations of active deposition
title_full The sieve lobe paradigm: Observations of active deposition
title_fullStr The sieve lobe paradigm: Observations of active deposition
title_full_unstemmed The sieve lobe paradigm: Observations of active deposition
title_sort The sieve lobe paradigm: Observations of active deposition
dc.creator.none.fl_str_mv Milana, Juan Pablo
author Milana, Juan Pablo
author_facet Milana, Juan Pablo
author_role author
dc.subject.none.fl_str_mv alluvial fan
sieve lobe
gravel
sedimentology
topic alluvial fan
sieve lobe
gravel
sedimentology
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Sieve deposits were once considered to be one of the building blocks in alluvial fan stratigraphy. Later re-interpretation of sieve lobes as debris-flow deposits, favored because no visual records of active sieve deposition had been reported, undermined its significance, divided opinions, and left this issue unresolved. Here, I document active deposition of sieve lobes in natural settings, supporting the original model. Sieve deposition can easily occur in natural settings such as proglacial outwash fans, small arid alluvial fans, or perennial streams when there is a scarcity of fine material, significant bedload, high slope, permeable ground and discharges moderate enough to allow infiltration. The only hydrodynamic requirement for sieve deposition is a high rate of water loss promoted by permeable bed sediments.. Under some circumstances alluvial fans can be built almost entirely of sieve deposits as shown here. One effect of the rapid extraction of water is the creation of sigmoidal fan profiles. A gradation from sieve deposition to sheetflood occurs if sediment becomes progressively less permeable or if water flow increases, overcoming bed permeability. Sieve deposition is a universal depositional process based simply on infiltration, and it explains matrix-poor clast-supported gravels, while alternative hypotheses, such as matrix winnowing of debris flows used to dispute the sieve model, need yet to be proven by observations in nature.
Fil: Milana, Juan Pablo. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
description Sieve deposits were once considered to be one of the building blocks in alluvial fan stratigraphy. Later re-interpretation of sieve lobes as debris-flow deposits, favored because no visual records of active sieve deposition had been reported, undermined its significance, divided opinions, and left this issue unresolved. Here, I document active deposition of sieve lobes in natural settings, supporting the original model. Sieve deposition can easily occur in natural settings such as proglacial outwash fans, small arid alluvial fans, or perennial streams when there is a scarcity of fine material, significant bedload, high slope, permeable ground and discharges moderate enough to allow infiltration. The only hydrodynamic requirement for sieve deposition is a high rate of water loss promoted by permeable bed sediments.. Under some circumstances alluvial fans can be built almost entirely of sieve deposits as shown here. One effect of the rapid extraction of water is the creation of sigmoidal fan profiles. A gradation from sieve deposition to sheetflood occurs if sediment becomes progressively less permeable or if water flow increases, overcoming bed permeability. Sieve deposition is a universal depositional process based simply on infiltration, and it explains matrix-poor clast-supported gravels, while alternative hypotheses, such as matrix winnowing of debris flows used to dispute the sieve model, need yet to be proven by observations in nature.
publishDate 2010
dc.date.none.fl_str_mv 2010-04
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/11336/101758
Milana, Juan Pablo; The sieve lobe paradigm: Observations of active deposition; Geological Society of America; Geology; 38; 3; 4-2010; 207-210
0091-7613
CONICET Digital
CONICET
url http://hdl.handle.net/11336/101758
identifier_str_mv Milana, Juan Pablo; The sieve lobe paradigm: Observations of active deposition; Geological Society of America; Geology; 38; 3; 4-2010; 207-210
0091-7613
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://doi.org/10.1130/G30504.1
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsa/geology/article-abstract/38/3/207/130175/The-sieve-lobe-paradigm-Observations-of-active
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 Geological Society of America
publisher.none.fl_str_mv Geological Society of America
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 13.070432

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