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
- Institución
- Universidad Nacional de Río Negro
- OAI Identificador
- oai:rid.unrn.edu.ar:20.500.12049/9514
Ver los metadatos del registro completo
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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 |
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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 |
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eng |
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2nd Palaeontological Virtual Congress |
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