High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes

Autores
Schwarz, Ernesto; Veiga, Gonzalo Diego; Spalletti, Luis Antonio
Año de publicación
2012
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Most of the Lower Cretaceous marine reservoirs of the Neuquén Basin (Argentina) occur within sedimentary successions in which siliciclastic deposits alternate with mixed siliciclastic/carbonate deposits. Alternations occur at different scales, from beds to third-order systems tracts. However, the processes involved in the temporal and/or spatial mixing of the sediments are far from understood. In order to bring some light onto these processes we document and discuss high-frequency sequences (HFS, typically < 15m thick) from outcrop and subsurface examples, in which mixed deposits occur at different stratigraphic intervals. HFS characterized by relatively thin (< 1m) mixed deposits at the base gradually passing into coarsening-upward siliciclastic intervals are very common within the studied strata (e.g. Mulichinco Fm, Valanginian). Basal bounding surfaces are demarcated by a Glossifungites suite. Mixed deposits consist of floatstones and wackestones with abundant micrite matrix, poorly sorted gravel- to sand-size shells, and variable proportion of very fine terrigenous sand and silt. The overlying siliciclastic succession typically begins with offshore mudstones, passing to bioturbated muddy sandstones, in turn grading upward to sandstones with HCS/SCS representing shoreface conditions. Mixed deposits are interpreted to result from combination of relatively low terrigenous influx and significant carbonate production, which was mainly driven by organisms in distal marine settings. Within the HFS they represent transgressive conditions, whereas the siliciclastics form progradational units. On the other hand, some HFS have regressive units consisting of offshore mudstones to lower-shoreface sandstones, which are capped by relatively thick (up to 4m) mixed deposits (e.g. Lower Agrio Fm, Hauterivian). These mixed deposits are laterally extensive units of sigmoidal to oblique cross-strata, in which fine-grained sandstones, skeletal sandstones and quartz-rich ooid grainstones occur. They are thought to represent uppershoreface conditions, likely prograding spits, in which carbonate sediments combined with siliciclastic particles that were continuously supplied from source areas during the regressive conditions. Noteworthy, carbonate productivity in this case is heavily associated with non-skeletal grains (ooids) and, to a minor extent, with skeletal remains. This suggests that contrasting types of carbonate factories can occur in different parts of HFS.
Fil: Schwarz, Ernesto. 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: Veiga, Gonzalo Diego. 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: Spalletti, Luis Antonio. 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
AAPG 2012 Annual Convention and Exhibition
Long Beach
Estados Unidos
American Association of Petroleum Geologists
Materia
Sedimentología
Cuenca Neuquina
Sistemas mixtos
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:11336/235518
Acceder
id CONICETDig_8575bce09a20d04a5f5fceeb0af6f21e
oai_identifier_str oai:ri.conicet.gov.ar:11336/235518
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processesSchwarz, ErnestoVeiga, Gonzalo DiegoSpalletti, Luis AntonioSedimentologíaCuenca NeuquinaSistemas mixtoshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Most of the Lower Cretaceous marine reservoirs of the Neuquén Basin (Argentina) occur within sedimentary successions in which siliciclastic deposits alternate with mixed siliciclastic/carbonate deposits. Alternations occur at different scales, from beds to third-order systems tracts. However, the processes involved in the temporal and/or spatial mixing of the sediments are far from understood. In order to bring some light onto these processes we document and discuss high-frequency sequences (HFS, typically < 15m thick) from outcrop and subsurface examples, in which mixed deposits occur at different stratigraphic intervals. HFS characterized by relatively thin (< 1m) mixed deposits at the base gradually passing into coarsening-upward siliciclastic intervals are very common within the studied strata (e.g. Mulichinco Fm, Valanginian). Basal bounding surfaces are demarcated by a Glossifungites suite. Mixed deposits consist of floatstones and wackestones with abundant micrite matrix, poorly sorted gravel- to sand-size shells, and variable proportion of very fine terrigenous sand and silt. The overlying siliciclastic succession typically begins with offshore mudstones, passing to bioturbated muddy sandstones, in turn grading upward to sandstones with HCS/SCS representing shoreface conditions. Mixed deposits are interpreted to result from combination of relatively low terrigenous influx and significant carbonate production, which was mainly driven by organisms in distal marine settings. Within the HFS they represent transgressive conditions, whereas the siliciclastics form progradational units. On the other hand, some HFS have regressive units consisting of offshore mudstones to lower-shoreface sandstones, which are capped by relatively thick (up to 4m) mixed deposits (e.g. Lower Agrio Fm, Hauterivian). These mixed deposits are laterally extensive units of sigmoidal to oblique cross-strata, in which fine-grained sandstones, skeletal sandstones and quartz-rich ooid grainstones occur. They are thought to represent uppershoreface conditions, likely prograding spits, in which carbonate sediments combined with siliciclastic particles that were continuously supplied from source areas during the regressive conditions. Noteworthy, carbonate productivity in this case is heavily associated with non-skeletal grains (ooids) and, to a minor extent, with skeletal remains. This suggests that contrasting types of carbonate factories can occur in different parts of HFS.Fil: Schwarz, Ernesto. 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: Veiga, Gonzalo Diego. 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: Spalletti, Luis Antonio. 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; ArgentinaAAPG 2012 Annual Convention and ExhibitionLong BeachEstados UnidosAmerican Association of Petroleum GeologistsAmerican Association of Petroleum Geologists2012info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/235518High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes; AAPG 2012 Annual Convention and Exhibition; Long Beach; Estados Unidos; 2012; 1-1CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.searchanddiscovery.com/abstracts/html/2012/90142ace/abstracts/schw3.htmInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:01:20Zoai:ri.conicet.gov.ar:11336/235518instacron: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 10:01:20.88CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes
title High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes
spellingShingle High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes
Schwarz, Ernesto
Sedimentología
Cuenca Neuquina
Sistemas mixtos
title_short High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes
title_full High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes
title_fullStr High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes
title_full_unstemmed High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes
title_sort High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes
dc.creator.none.fl_str_mv Schwarz, Ernesto
Veiga, Gonzalo Diego
Spalletti, Luis Antonio
author Schwarz, Ernesto
author_facet Schwarz, Ernesto
Veiga, Gonzalo Diego
Spalletti, Luis Antonio
author_role author
author2 Veiga, Gonzalo Diego
Spalletti, Luis Antonio
author2_role author
author
dc.subject.none.fl_str_mv Sedimentología
Cuenca Neuquina
Sistemas mixtos
topic Sedimentología
Cuenca Neuquina
Sistemas mixtos
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Most of the Lower Cretaceous marine reservoirs of the Neuquén Basin (Argentina) occur within sedimentary successions in which siliciclastic deposits alternate with mixed siliciclastic/carbonate deposits. Alternations occur at different scales, from beds to third-order systems tracts. However, the processes involved in the temporal and/or spatial mixing of the sediments are far from understood. In order to bring some light onto these processes we document and discuss high-frequency sequences (HFS, typically < 15m thick) from outcrop and subsurface examples, in which mixed deposits occur at different stratigraphic intervals. HFS characterized by relatively thin (< 1m) mixed deposits at the base gradually passing into coarsening-upward siliciclastic intervals are very common within the studied strata (e.g. Mulichinco Fm, Valanginian). Basal bounding surfaces are demarcated by a Glossifungites suite. Mixed deposits consist of floatstones and wackestones with abundant micrite matrix, poorly sorted gravel- to sand-size shells, and variable proportion of very fine terrigenous sand and silt. The overlying siliciclastic succession typically begins with offshore mudstones, passing to bioturbated muddy sandstones, in turn grading upward to sandstones with HCS/SCS representing shoreface conditions. Mixed deposits are interpreted to result from combination of relatively low terrigenous influx and significant carbonate production, which was mainly driven by organisms in distal marine settings. Within the HFS they represent transgressive conditions, whereas the siliciclastics form progradational units. On the other hand, some HFS have regressive units consisting of offshore mudstones to lower-shoreface sandstones, which are capped by relatively thick (up to 4m) mixed deposits (e.g. Lower Agrio Fm, Hauterivian). These mixed deposits are laterally extensive units of sigmoidal to oblique cross-strata, in which fine-grained sandstones, skeletal sandstones and quartz-rich ooid grainstones occur. They are thought to represent uppershoreface conditions, likely prograding spits, in which carbonate sediments combined with siliciclastic particles that were continuously supplied from source areas during the regressive conditions. Noteworthy, carbonate productivity in this case is heavily associated with non-skeletal grains (ooids) and, to a minor extent, with skeletal remains. This suggests that contrasting types of carbonate factories can occur in different parts of HFS.
Fil: Schwarz, Ernesto. 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: Veiga, Gonzalo Diego. 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: Spalletti, Luis Antonio. 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
AAPG 2012 Annual Convention and Exhibition
Long Beach
Estados Unidos
American Association of Petroleum Geologists
description Most of the Lower Cretaceous marine reservoirs of the Neuquén Basin (Argentina) occur within sedimentary successions in which siliciclastic deposits alternate with mixed siliciclastic/carbonate deposits. Alternations occur at different scales, from beds to third-order systems tracts. However, the processes involved in the temporal and/or spatial mixing of the sediments are far from understood. In order to bring some light onto these processes we document and discuss high-frequency sequences (HFS, typically < 15m thick) from outcrop and subsurface examples, in which mixed deposits occur at different stratigraphic intervals. HFS characterized by relatively thin (< 1m) mixed deposits at the base gradually passing into coarsening-upward siliciclastic intervals are very common within the studied strata (e.g. Mulichinco Fm, Valanginian). Basal bounding surfaces are demarcated by a Glossifungites suite. Mixed deposits consist of floatstones and wackestones with abundant micrite matrix, poorly sorted gravel- to sand-size shells, and variable proportion of very fine terrigenous sand and silt. The overlying siliciclastic succession typically begins with offshore mudstones, passing to bioturbated muddy sandstones, in turn grading upward to sandstones with HCS/SCS representing shoreface conditions. Mixed deposits are interpreted to result from combination of relatively low terrigenous influx and significant carbonate production, which was mainly driven by organisms in distal marine settings. Within the HFS they represent transgressive conditions, whereas the siliciclastics form progradational units. On the other hand, some HFS have regressive units consisting of offshore mudstones to lower-shoreface sandstones, which are capped by relatively thick (up to 4m) mixed deposits (e.g. Lower Agrio Fm, Hauterivian). These mixed deposits are laterally extensive units of sigmoidal to oblique cross-strata, in which fine-grained sandstones, skeletal sandstones and quartz-rich ooid grainstones occur. They are thought to represent uppershoreface conditions, likely prograding spits, in which carbonate sediments combined with siliciclastic particles that were continuously supplied from source areas during the regressive conditions. Noteworthy, carbonate productivity in this case is heavily associated with non-skeletal grains (ooids) and, to a minor extent, with skeletal remains. This suggests that contrasting types of carbonate factories can occur in different parts of HFS.
publishDate 2012
dc.date.none.fl_str_mv 2012
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Congreso
Book
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/235518
High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes; AAPG 2012 Annual Convention and Exhibition; Long Beach; Estados Unidos; 2012; 1-1
CONICET Digital
CONICET
url http://hdl.handle.net/11336/235518
identifier_str_mv High-resolution sequence stratigraphy of mixed deposits in the lower cretaceous marine record of the Neuquén Basin, Argentina: Towards an understanding of mixing processes; AAPG 2012 Annual Convention and Exhibition; Long Beach; Estados Unidos; 2012; 1-1
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://www.searchanddiscovery.com/abstracts/html/2012/90142ace/abstracts/schw3.htm
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
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dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv American Association of Petroleum Geologists
publisher.none.fl_str_mv American Association of Petroleum Geologists
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
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reponame_str CONICET Digital (CONICET)
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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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