Modern foraminifera from coastal settings in northern Argentina: Implications for the paleoenvironmental interpretation of Mid Holocene littoral deposits

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In Buenos Aires coasts, sedimentary processes were particularly active during the Quaternary owing to eustatic fluctuations in sea level. As a result, during the late Quaternary transgressions, marine and marginal marine sediments were deposited in the coastal plain. In order to interpret these Holo...

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Autores principales: Laprida, C., Chandler, D.D.E., Mercau, J.R., López, R.A., Marcomini, S.
Formato: JOUR
Materias:
Argentina
Benthic foraminifera
Holocene
Modern beaches
Paleoenvironmental reconstruction
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10268774_v28_n1_p45_Laprida
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_10268774_v28_n1_p45_Laprida2023-10-03T15:56:59Z Modern foraminifera from coastal settings in northern Argentina: Implications for the paleoenvironmental interpretation of Mid Holocene littoral deposits Laprida, C. Chandler, D.D.E. Mercau, J.R. López, R.A. Marcomini, S. Argentina Benthic foraminifera Holocene Modern beaches Paleoenvironmental reconstruction In Buenos Aires coasts, sedimentary processes were particularly active during the Quaternary owing to eustatic fluctuations in sea level. As a result, during the late Quaternary transgressions, marine and marginal marine sediments were deposited in the coastal plain. In order to interpret these Holocene littoral sequences, we analyzed the distribution, diversity, species composition and taphonomic features of total benthic foraminifera assemblages from modern littoral settings, from the top of the dune to the lower shoreface, in two close but geomorphologically different transects located in the Atlantic coast of Northern Buenos Aires Province (Argentina, South America). Total benthic foraminiferal assemblages from subtidal and supratidal environments are distinguishable in terms of composition, diversity and taphonomic features. In upper shoreface, foreshore, backshore and foredune environments, assemblages are clearly dominated by three species: Buccella peruviana, Ammonia beccarii and Elphidium discoidale (the BAE group). This feature is the result of taphonomic processes that favor the selective preservation of such species. The study of taphonomic modifications of shells in modern assemblages allows a better discrimination between subenvironments than the analysis of taxonomic composition. Although Holocene assemblages have no strict counterparts between total modern assemblages, taxonomic composition and taphonomic modification of shells allow us to infer that the Holocene sequence was deposited between the upper shoreface and the backshore. Fil:Laprida, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mercau, J.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:López, R.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Marcomini, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10268774_v28_n1_p45_Laprida
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Benthic foraminifera
Holocene
Modern beaches
Paleoenvironmental reconstruction
spellingShingle Argentina
Benthic foraminifera
Holocene
Modern beaches
Paleoenvironmental reconstruction
Laprida, C.
Chandler, D.D.E.
Mercau, J.R.
López, R.A.
Marcomini, S.
Modern foraminifera from coastal settings in northern Argentina: Implications for the paleoenvironmental interpretation of Mid Holocene littoral deposits
topic_facet Argentina
Benthic foraminifera
Holocene
Modern beaches
Paleoenvironmental reconstruction
description In Buenos Aires coasts, sedimentary processes were particularly active during the Quaternary owing to eustatic fluctuations in sea level. As a result, during the late Quaternary transgressions, marine and marginal marine sediments were deposited in the coastal plain. In order to interpret these Holocene littoral sequences, we analyzed the distribution, diversity, species composition and taphonomic features of total benthic foraminifera assemblages from modern littoral settings, from the top of the dune to the lower shoreface, in two close but geomorphologically different transects located in the Atlantic coast of Northern Buenos Aires Province (Argentina, South America). Total benthic foraminiferal assemblages from subtidal and supratidal environments are distinguishable in terms of composition, diversity and taphonomic features. In upper shoreface, foreshore, backshore and foredune environments, assemblages are clearly dominated by three species: Buccella peruviana, Ammonia beccarii and Elphidium discoidale (the BAE group). This feature is the result of taphonomic processes that favor the selective preservation of such species. The study of taphonomic modifications of shells in modern assemblages allows a better discrimination between subenvironments than the analysis of taxonomic composition. Although Holocene assemblages have no strict counterparts between total modern assemblages, taxonomic composition and taphonomic modification of shells allow us to infer that the Holocene sequence was deposited between the upper shoreface and the backshore.
format JOUR
author Laprida, C.
Chandler, D.D.E.
Mercau, J.R.
López, R.A.
Marcomini, S.
author_facet Laprida, C.
Chandler, D.D.E.
Mercau, J.R.
López, R.A.
Marcomini, S.
author_sort Laprida, C.
title Modern foraminifera from coastal settings in northern Argentina: Implications for the paleoenvironmental interpretation of Mid Holocene littoral deposits
title_short Modern foraminifera from coastal settings in northern Argentina: Implications for the paleoenvironmental interpretation of Mid Holocene littoral deposits
title_full Modern foraminifera from coastal settings in northern Argentina: Implications for the paleoenvironmental interpretation of Mid Holocene littoral deposits
title_fullStr Modern foraminifera from coastal settings in northern Argentina: Implications for the paleoenvironmental interpretation of Mid Holocene littoral deposits
title_full_unstemmed Modern foraminifera from coastal settings in northern Argentina: Implications for the paleoenvironmental interpretation of Mid Holocene littoral deposits
title_sort modern foraminifera from coastal settings in northern argentina: implications for the paleoenvironmental interpretation of mid holocene littoral deposits
url http://hdl.handle.net/20.500.12110/paper_10268774_v28_n1_p45_Laprida
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