Agglutinated encrusting foraminifers from the Agua de la Mula Member (Agrio Formation, Neuquén Basin - Argentina): paleoecological and paleoenvironmental implications.

Autores
Caratelli, Martina; Archuby, Fernando Miguel; Pignatti, Johannes
Año de publicación
2020
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Fil: Caratelli, Martina. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro; Argentina.
Fil: Archuby, Fernando Miguel. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro; Argentina.
Fil: Pignatti, Johannes. Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, Piazzale Aldo Moro 5, 00185, Roma, Italy
A new fauna consisting of agglutinated encrusting foraminifers has been collected from several nodular levels in the upper Hauterivian-lower Barremian Agua de la Mula Member of the Agrio Formation (Patagonia, Argentina). The study foraminifers come from two stratigraphic sections in the Neuquén Basin and show affinities with the genera Haddonia Chapman, 1898, Alpinophragmium Flügel, 1967, Bdelloidina Carter, 1877 and Coscinophragma Thalmann, 1951. Provisionally, the new specimens are considered to differ from the above-mentioned genera, but they remain in open nomenclature. One or more specimens are clustered around bioclastic nuclei of cerebroidal sub-spherical nodules, forming columnar and circum- granular ‘microbuildups’. The nodules occur both separated from each other in a fine-grained siliciclastic matrix as well as forming larger moundlike accumulations of up to 2 meters in thickness. The encrusting foraminifers-bearing deposits consist of bioclastic sandstone, allochemic mudrock and micritic rudstone, and are embedded into an alternation of condensed bioclastic sandstone and grey/dark marly clay. The latter has been earlier interpreted as alternating couplets of sixth-order Milankovitch precession-driven cycles, named starvation/dilution sequences. These couplets are characterised by a switch from very low to high sedimentation rates, as recorded by deposition of condensed beds and siliciclastic intervals respectively. Semiquantitative analysis by Scanning Electron Microscope (SEM) was performed in order to characterise the morphology and test mineralogy of the specimens. A preliminary study on the type of growth of the ‘microbuildups’ allows us to corroborate previous interpretations of low oxygen conditions and of a lowered rate of terrigenous input for the analysed interval.
Materia
Ciencias Exactas y Naturales
Agglutinated foraminifera
Agua de la Mula Member
Lower Cretaceous
Ciencias Exactas y Naturales
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
RID-UNRN (UNRN)
Institución
Universidad Nacional de Río Negro
OAI Identificador
oai:rid.unrn.edu.ar:20.500.12049/9514

id RIDUNRN_930f67a7e3669fc8c957e5293b96ff20
oai_identifier_str oai:rid.unrn.edu.ar:20.500.12049/9514
network_acronym_str RIDUNRN
repository_id_str 4369
network_name_str RID-UNRN (UNRN)
spelling Agglutinated encrusting foraminifers from the Agua de la Mula Member (Agrio Formation, Neuquén Basin - Argentina): paleoecological and paleoenvironmental implications.Caratelli, MartinaArchuby, Fernando MiguelPignatti, JohannesCiencias Exactas y NaturalesAgglutinated foraminiferaAgua de la Mula MemberLower CretaceousCiencias Exactas y NaturalesFil: Caratelli, Martina. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro; Argentina.Fil: Archuby, Fernando Miguel. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro; Argentina.Fil: Pignatti, Johannes. Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, Piazzale Aldo Moro 5, 00185, Roma, ItalyA new fauna consisting of agglutinated encrusting foraminifers has been collected from several nodular levels in the upper Hauterivian-lower Barremian Agua de la Mula Member of the Agrio Formation (Patagonia, Argentina). The study foraminifers come from two stratigraphic sections in the Neuquén Basin and show affinities with the genera Haddonia Chapman, 1898, Alpinophragmium Flügel, 1967, Bdelloidina Carter, 1877 and Coscinophragma Thalmann, 1951. Provisionally, the new specimens are considered to differ from the above-mentioned genera, but they remain in open nomenclature. One or more specimens are clustered around bioclastic nuclei of cerebroidal sub-spherical nodules, forming columnar and circum- granular ‘microbuildups’. The nodules occur both separated from each other in a fine-grained siliciclastic matrix as well as forming larger moundlike accumulations of up to 2 meters in thickness. The encrusting foraminifers-bearing deposits consist of bioclastic sandstone, allochemic mudrock and micritic rudstone, and are embedded into an alternation of condensed bioclastic sandstone and grey/dark marly clay. The latter has been earlier interpreted as alternating couplets of sixth-order Milankovitch precession-driven cycles, named starvation/dilution sequences. These couplets are characterised by a switch from very low to high sedimentation rates, as recorded by deposition of condensed beds and siliciclastic intervals respectively. Semiquantitative analysis by Scanning Electron Microscope (SEM) was performed in order to characterise the morphology and test mineralogy of the specimens. A preliminary study on the type of growth of the ‘microbuildups’ allows us to corroborate previous interpretations of low oxygen conditions and of a lowered rate of terrigenous input for the analysed interval.2020info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttps://www.uv.es/palaeovc/Documentos%20/2nd%20PVC/2nd_PVC_Book_of_Abstracts.pdfhttp://rid.unrn.edu.ar/handle/20.500.12049/9514eng2nd Palaeontological Virtual Congressinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/4.0/reponame:RID-UNRN (UNRN)instname:Universidad Nacional de Río Negro2025-09-29T14:29:04Zoai:rid.unrn.edu.ar:20.500.12049/9514instacron:UNRNInstitucionalhttps://rid.unrn.edu.ar/jspui/Universidad públicaNo correspondehttps://rid.unrn.edu.ar/oai/snrdrid@unrn.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:43692025-09-29 14:29:04.512RID-UNRN (UNRN) - Universidad Nacional de Río Negrofalse
dc.title.none.fl_str_mv Agglutinated encrusting foraminifers from the Agua de la Mula Member (Agrio Formation, Neuquén Basin - Argentina): paleoecological and paleoenvironmental implications.
title Agglutinated encrusting foraminifers from the Agua de la Mula Member (Agrio Formation, Neuquén Basin - Argentina): paleoecological and paleoenvironmental implications.
spellingShingle Agglutinated encrusting foraminifers from the Agua de la Mula Member (Agrio Formation, Neuquén Basin - Argentina): paleoecological and paleoenvironmental implications.
Caratelli, Martina
Ciencias Exactas y Naturales
Agglutinated foraminifera
Agua de la Mula Member
Lower Cretaceous
Ciencias Exactas y Naturales
title_short Agglutinated encrusting foraminifers from the Agua de la Mula Member (Agrio Formation, Neuquén Basin - Argentina): paleoecological and paleoenvironmental implications.
title_full Agglutinated encrusting foraminifers from the Agua de la Mula Member (Agrio Formation, Neuquén Basin - Argentina): paleoecological and paleoenvironmental implications.
title_fullStr Agglutinated encrusting foraminifers from the Agua de la Mula Member (Agrio Formation, Neuquén Basin - Argentina): paleoecological and paleoenvironmental implications.
title_full_unstemmed Agglutinated encrusting foraminifers from the Agua de la Mula Member (Agrio Formation, Neuquén Basin - Argentina): paleoecological and paleoenvironmental implications.
title_sort Agglutinated encrusting foraminifers from the Agua de la Mula Member (Agrio Formation, Neuquén Basin - Argentina): paleoecological and paleoenvironmental implications.
dc.creator.none.fl_str_mv Caratelli, Martina
Archuby, Fernando Miguel
Pignatti, Johannes
author Caratelli, Martina
author_facet Caratelli, Martina
Archuby, Fernando Miguel
Pignatti, Johannes
author_role author
author2 Archuby, Fernando Miguel
Pignatti, Johannes
author2_role author
author
dc.subject.none.fl_str_mv Ciencias Exactas y Naturales
Agglutinated foraminifera
Agua de la Mula Member
Lower Cretaceous
Ciencias Exactas y Naturales
topic Ciencias Exactas y Naturales
Agglutinated foraminifera
Agua de la Mula Member
Lower Cretaceous
Ciencias Exactas y Naturales
dc.description.none.fl_txt_mv Fil: Caratelli, Martina. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro; Argentina.
Fil: Archuby, Fernando Miguel. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro; Argentina.
Fil: Pignatti, Johannes. Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, Piazzale Aldo Moro 5, 00185, Roma, Italy
A new fauna consisting of agglutinated encrusting foraminifers has been collected from several nodular levels in the upper Hauterivian-lower Barremian Agua de la Mula Member of the Agrio Formation (Patagonia, Argentina). The study foraminifers come from two stratigraphic sections in the Neuquén Basin and show affinities with the genera Haddonia Chapman, 1898, Alpinophragmium Flügel, 1967, Bdelloidina Carter, 1877 and Coscinophragma Thalmann, 1951. Provisionally, the new specimens are considered to differ from the above-mentioned genera, but they remain in open nomenclature. One or more specimens are clustered around bioclastic nuclei of cerebroidal sub-spherical nodules, forming columnar and circum- granular ‘microbuildups’. The nodules occur both separated from each other in a fine-grained siliciclastic matrix as well as forming larger moundlike accumulations of up to 2 meters in thickness. The encrusting foraminifers-bearing deposits consist of bioclastic sandstone, allochemic mudrock and micritic rudstone, and are embedded into an alternation of condensed bioclastic sandstone and grey/dark marly clay. The latter has been earlier interpreted as alternating couplets of sixth-order Milankovitch precession-driven cycles, named starvation/dilution sequences. These couplets are characterised by a switch from very low to high sedimentation rates, as recorded by deposition of condensed beds and siliciclastic intervals respectively. Semiquantitative analysis by Scanning Electron Microscope (SEM) was performed in order to characterise the morphology and test mineralogy of the specimens. A preliminary study on the type of growth of the ‘microbuildups’ allows us to corroborate previous interpretations of low oxygen conditions and of a lowered rate of terrigenous input for the analysed interval.
description Fil: Caratelli, Martina. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro; Argentina.
publishDate 2020
dc.date.none.fl_str_mv 2020
dc.type.none.fl_str_mv info:eu-repo/semantics/conferenceObject
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
format conferenceObject
status_str publishedVersion
dc.identifier.none.fl_str_mv https://www.uv.es/palaeovc/Documentos%20/2nd%20PVC/2nd_PVC_Book_of_Abstracts.pdf
http://rid.unrn.edu.ar/handle/20.500.12049/9514
url https://www.uv.es/palaeovc/Documentos%20/2nd%20PVC/2nd_PVC_Book_of_Abstracts.pdf
http://rid.unrn.edu.ar/handle/20.500.12049/9514
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 2nd Palaeontological Virtual Congress
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:RID-UNRN (UNRN)
instname:Universidad Nacional de Río Negro
reponame_str RID-UNRN (UNRN)
collection RID-UNRN (UNRN)
instname_str Universidad Nacional de Río Negro
repository.name.fl_str_mv RID-UNRN (UNRN) - Universidad Nacional de Río Negro
repository.mail.fl_str_mv rid@unrn.edu.ar
_version_ 1844621609477865472
score 12.559606