The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic)
The Uruguayan continental shelf is characterised by a unique hydrographic system, composed of the Río de la Plata buoyant plume (RdlP-BP), and by water masses of contrasting thermohaline characteristics. Below the RdlP-BP the southward-flowing Subtropical Shelf Water and the northward-flowing Subant...
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| Dil: | İngilizce |
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2019
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| Online Erişim: | https://hdl.handle.net/20.500.12008/28104 |
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| _version_ | 1868890065810227200 |
|---|---|
| author | Burone, Leticia |
| author2 | Franco-Fraguas, Paula Mahiques, Michel Lahuerta, N. Díaz de Rada, J.R. Rodríguez, Matilde Bícego, M.C. Marín, Yamandú Gómez-Erache, Mónica Ortega, Leonardo |
| author2_role | author author author author author author author author author |
| author_browse | Burone, Leticia Bícego, M.C. Díaz de Rada, J.R. Franco-Fraguas, Paula Gómez-Erache, Mónica Lahuerta, N. Mahiques, Michel Marín, Yamandú Ortega, Leonardo Rodríguez, Matilde |
| author_facet | Burone, Leticia Franco-Fraguas, Paula Mahiques, Michel Lahuerta, N. Díaz de Rada, J.R. Rodríguez, Matilde Bícego, M.C. Marín, Yamandú Gómez-Erache, Mónica Ortega, Leonardo |
| author_role | author |
| collection | COLIBRI |
| dc.contributor.none.fl_str_mv | Burone Leticia, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales. Franco-Fraguas Paula, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales. Mahiques M.M. Lahuerta N. Díaz de Rada J.R. Rodríguez Matilde, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales. Bícego M.C. Marín Yamandú, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales. Gómez-Erache Mónica, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales. Ortega Leonardo |
| dc.creator.none.fl_str_mv | Burone, Leticia Franco-Fraguas, Paula Mahiques, Michel Lahuerta, N. Díaz de Rada, J.R. Rodríguez, Matilde Bícego, M.C. Marín, Yamandú Gómez-Erache, Mónica Ortega, Leonardo |
| dc.date.none.fl_str_mv | 2019 2021-06-08T13:37:36Z 2021-06-08T13:37:36Z |
| dc.format.none.fl_str_mv | 18 h. application/pdf |
| dc.identifier.none.fl_str_mv | Burone, L, Franco Fraguas, P, Mahiques, M, [y otros] "The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic)". Journal of Sedimentary Environments. [en línea] 2019, 4 (4): 403-420. 18 h. DOI: 10.12957/jse.2019.47021 2447-9462 https://hdl.handle.net/20.500.12008/28104 10.12957/jse.2019.47021 |
| dc.language.none.fl_str_mv | en eng |
| dc.publisher.none.fl_str_mv | Universidade do Estado do Rio de Janeiro |
| dc.relation.none.fl_str_mv | Journal of Sedimentary Environments, 2019, 4 (4): 403-420 |
| dc.rights.none.fl_str_mv | info:eu-repo/semantics/openAccess Licencia Creative Commons Atribución (CC - By 4.0) |
| dc.source.none.fl_str_mv | reponame:COLIBRI instname:Universidad de la República instacron:Universidad de la República |
| dc.subject.none.fl_str_mv | Sedimentary dynamics Hydrographic dynamics Río de la Plata estuary South-western Atlantic Inner shelf |
| dc.title.none.fl_str_mv | The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic) |
| dc.type.none.fl_str_mv | Artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| description | The Uruguayan continental shelf is characterised by a unique hydrographic system, composed of the Río de la Plata buoyant plume (RdlP-BP), and by water masses of contrasting thermohaline characteristics. Below the RdlP-BP the southward-flowing Subtropical Shelf Water and the northward-flowing Subantarctic Shelf Water converge at the Subtropical Shelf Front, which is the shelf extension of the Brazil-Malvinas Confluence. Three main sedimentary environments can be described associated with; I) “Atlantic coastal sands” (i.e. onshore from the palaeovalley); II) the SW-NE running “RdlP palaeovalley” and; III) “Relict sands” (i.e., offshore of the RdlP palaeovalley). Three exposed sedimentary units (U1 to U3) identified from acoustic profiles and sediment cores (sedimentary characteristics of stratigraphic units) almost entirely restricted to the palaeovalley. The transect here studied intersects these three environments contributing thus with the description of the morphological setting and sedimentary coverture. Physical and geochemical data were integrated and used to characterise the sedimentary facies previously described in the inner shelf and to understand environmental control on the development of these facies. Sediments from U1 show the terrestrial imprint of the RdlP and drier regional conditions, while sediments that characterised U3 indicate a sandy facies (quartz and bioclasts: whole and fragmented shells and polychaetes tubes) corresponding to an ancient coast. This last (with approximately 11 m height), is probably related to sea-level stabilization, between 20 and 25 m occurring during the Upper Pleistocene and Holocene for the South-Western Atlantic. The sediment from U3 reflects the colder and drier conditions prevailing in the region during the formation of this facies (13.7 and 9.7 cal ka BP). Eroded sediments (e.g., from U3; ancient coast) are deposited inside the palaeovalley and on the onshore region (between the palaeovalley and coastal sands). Also, U1 extends from the palaeovalley covering the onshore region. The outcrop of warmer oceanic shelf waters was probably a consequence of the geomorphology of the palaeovalley (edge of the palaeovalley) and related to the still fall presence of waters typical of the austral warm season when higher advection of Brazil Current occurs over the shelf. In this regard, the mound-like feature should induce bottom water to rise, operating as a ramp. Productivity proxies (Si/Ti, Ba/Ti, Ca/Ti and P/Ti) present the highest values in these stations (S16-S18), reflecting the imprint of the upwelling in the sediment. The information reported in this work is particularly important to better understand sedimentological dynamics in the Uruguayan inner shelf and the Southwestern Atlantic region. It is also important for elaborating more precise paleoenvironmental and palaeoceanographic reconstructions. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | anni_57fccd9a4e720d33e27aaf93c989952b |
| identifier_str_mv | Burone, L, Franco Fraguas, P, Mahiques, M, [y otros] "The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic)". Journal of Sedimentary Environments. [en línea] 2019, 4 (4): 403-420. 18 h. DOI: 10.12957/jse.2019.47021 2447-9462 10.12957/jse.2019.47021 |
| instacron_str | Universidad de la República |
| institution | Universidad de la República |
| instname_str | Universidad de la República |
| language | eng |
| language_invalid_str_mv | en |
| network_acronym_str | anni |
| network_name_str | oai-lr-anni |
| oai_identifier_str | oai:colibri.udelar.edu.uy:20.500.12008/28104 |
| publishDate | 2019 |
| publishDateSort | 2019 |
| publisher.none.fl_str_mv | Universidade do Estado do Rio de Janeiro |
| reponame_str | COLIBRI |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | Licencia Creative Commons Atribución (CC - By 4.0) |
| spelling | The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic)Burone, LeticiaFranco-Fraguas, PaulaMahiques, MichelLahuerta, N.Díaz de Rada, J.R.Rodríguez, MatildeBícego, M.C.Marín, YamandúGómez-Erache, MónicaOrtega, LeonardoSedimentary dynamicsHydrographic dynamicsRío de la Plata estuarySouth-western AtlanticInner shelfThe Uruguayan continental shelf is characterised by a unique hydrographic system, composed of the Río de la Plata buoyant plume (RdlP-BP), and by water masses of contrasting thermohaline characteristics. Below the RdlP-BP the southward-flowing Subtropical Shelf Water and the northward-flowing Subantarctic Shelf Water converge at the Subtropical Shelf Front, which is the shelf extension of the Brazil-Malvinas Confluence. Three main sedimentary environments can be described associated with; I) “Atlantic coastal sands” (i.e. onshore from the palaeovalley); II) the SW-NE running “RdlP palaeovalley” and; III) “Relict sands” (i.e., offshore of the RdlP palaeovalley). Three exposed sedimentary units (U1 to U3) identified from acoustic profiles and sediment cores (sedimentary characteristics of stratigraphic units) almost entirely restricted to the palaeovalley. The transect here studied intersects these three environments contributing thus with the description of the morphological setting and sedimentary coverture. Physical and geochemical data were integrated and used to characterise the sedimentary facies previously described in the inner shelf and to understand environmental control on the development of these facies. Sediments from U1 show the terrestrial imprint of the RdlP and drier regional conditions, while sediments that characterised U3 indicate a sandy facies (quartz and bioclasts: whole and fragmented shells and polychaetes tubes) corresponding to an ancient coast. This last (with approximately 11 m height), is probably related to sea-level stabilization, between 20 and 25 m occurring during the Upper Pleistocene and Holocene for the South-Western Atlantic. The sediment from U3 reflects the colder and drier conditions prevailing in the region during the formation of this facies (13.7 and 9.7 cal ka BP). Eroded sediments (e.g., from U3; ancient coast) are deposited inside the palaeovalley and on the onshore region (between the palaeovalley and coastal sands). Also, U1 extends from the palaeovalley covering the onshore region. The outcrop of warmer oceanic shelf waters was probably a consequence of the geomorphology of the palaeovalley (edge of the palaeovalley) and related to the still fall presence of waters typical of the austral warm season when higher advection of Brazil Current occurs over the shelf. In this regard, the mound-like feature should induce bottom water to rise, operating as a ramp. Productivity proxies (Si/Ti, Ba/Ti, Ca/Ti and P/Ti) present the highest values in these stations (S16-S18), reflecting the imprint of the upwelling in the sediment. The information reported in this work is particularly important to better understand sedimentological dynamics in the Uruguayan inner shelf and the Southwestern Atlantic region. It is also important for elaborating more precise paleoenvironmental and palaeoceanographic reconstructions.Universidade do Estado do Rio de JaneiroBurone Leticia, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales.Franco-Fraguas Paula, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales.Mahiques M.M.Lahuerta N.Díaz de Rada J.R.Rodríguez Matilde, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales.Bícego M.C.Marín Yamandú, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales.Gómez-Erache Mónica, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales.Ortega Leonardo2021-06-08T13:37:36Z2021-06-08T13:37:36Z2019Artículoinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion18 h.application/pdfBurone, L, Franco Fraguas, P, Mahiques, M, [y otros] "The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic)". Journal of Sedimentary Environments. [en línea] 2019, 4 (4): 403-420. 18 h. DOI: 10.12957/jse.2019.470212447-9462https://hdl.handle.net/20.500.12008/2810410.12957/jse.2019.47021reponame:COLIBRIinstname:Universidad de la Repúblicainstacron:Universidad de la RepúblicaenengJournal of Sedimentary Environments, 2019, 4 (4): 403-420Las obras depositadas en el Repositorio se rigen por la Ordenanza de los Derechos de la Propiedad Intelectual de la Universidad de la República.(Res. Nº 91 de C.D.C. de 8/III/1994 – D.O. 7/IV/1994) y por la Ordenanza del Repositorio Abierto de la Universidad de la República (Res. Nº 16 de C.D.C. de 07/10/2014)info:eu-repo/semantics/openAccessLicencia Creative Commons Atribución (CC - By 4.0)oai:colibri.udelar.edu.uy:20.500.12008/281042026-04-14T10:09:39Z |
| spellingShingle | The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic) Burone, Leticia Sedimentary dynamics Hydrographic dynamics Río de la Plata estuary South-western Atlantic Inner shelf |
| status_str | publishedVersion |
| title | The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic) |
| title_full | The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic) |
| title_fullStr | The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic) |
| title_full_unstemmed | The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic) |
| title_short | The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic) |
| title_sort | The imprint of the geological inheritage and present dynamics on uruguayan inner shelf sediments (south-western Atlantic) |
| topic | Sedimentary dynamics Hydrographic dynamics Río de la Plata estuary South-western Atlantic Inner shelf |
| url | https://hdl.handle.net/20.500.12008/28104 |