Mid-Holocene evolution and paleoenvironments of the shoreface-offshore transition, north-eastern Argentina: New evidence based on benthic microfauna

A sedimentary record spanning 5792-5511 cal yr BP and 3188-2854 cal yr BP was recovered at 36° 45′ 43″ S-56 ° 37′ 13″ W, south-west South Atlantic. The sedimentological features and micropaleontological (benthic foraminifera and ostracoda) content were analyzed in order to reconstruct paleoenvironme...

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Autores principales:	Laprida, C., Chapori, N.G., Violante, R.A., Compagnucci, R.H.
Formato:	JOUR
Materias:	Argentina benthic foraminifera mid-Holocene sea-level changes ostracoda SW South Atlantic Benthic foraminifera Benthic microfauna Ostracoda Clay Coastal zones Marine biology Oceanography Sand Silt Sediments benthos crustacean evolution Holocene micropaleontology paleoenvironment sea level change sedimentology Atlantic Ocean Atlantic Ocean (South) Rio de la Plata South America Foraminifera
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00253227_v240_n1-4_p43_Laprida
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_00253227_v240_n1-4_p43_Laprida2023-10-03T14:36:00Z Mid-Holocene evolution and paleoenvironments of the shoreface-offshore transition, north-eastern Argentina: New evidence based on benthic microfauna Laprida, C. Chapori, N.G. Violante, R.A. Compagnucci, R.H. Argentina benthic foraminifera mid-Holocene sea-level changes ostracoda SW South Atlantic Benthic foraminifera Benthic microfauna Ostracoda Clay Coastal zones Marine biology Oceanography Sand Silt Sediments benthos crustacean evolution Holocene micropaleontology paleoenvironment sea level change sedimentology Argentina Atlantic Ocean Atlantic Ocean (South) Rio de la Plata South America Foraminifera Ostracoda A sedimentary record spanning 5792-5511 cal yr BP and 3188-2854 cal yr BP was recovered at 36° 45′ 43″ S-56 ° 37′ 13″ W, south-west South Atlantic. The sedimentological features and micropaleontological (benthic foraminifera and ostracoda) content were analyzed in order to reconstruct paleoenvironmental conditions. Considerable environmental fluctuations are indicated by all these proxies. Five different stages were distinguished: Stage 1 (ca. 5800-5000 cal yr BP) consists of muddy sand with abundant microfossils. In this interval, species typical for inner marine shelf environments maintained a high abundance. Stage 2 consists of plastic light greenish grey clays barren of microfossils, and probably represents fluvial input from the de la Plata River to the shelf contemporaneous of a lowering of sea level. Stage 3 is composed of brownish yellow sandy silts, and represents increasing marine conditions in the area as reflected by higher faunal diversity and typical foraminifera of inner shelf environments. Stage 4 is made of homogeneous mud, barren of microfossil, which represents a new pulse of fluvial input to the shelf in consequence of a new fall in sea level. The final part of the core (Stage 5) is a coarsening upward sequence, grading from greeny brown clayey sandy silts to coarse shelly sands and represents the modern sedimentation in the area. This interpretation strengthens the stepped model of late-Holocene sea-level fall between 5511-5792 cal yr BP and 2854-3188 cal yr BP in Buenos Aires coast, and agrees with the relative sea-level history previously proposed by some authors from western South Atlantic coasts. © 2007 Elsevier B.V. All rights reserved. Fil:Laprida, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Compagnucci, R.H. 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_00253227_v240_n1-4_p43_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 mid-Holocene sea-level changes ostracoda SW South Atlantic Benthic foraminifera Benthic microfauna Ostracoda Clay Coastal zones Marine biology Oceanography Sand Silt Sediments benthos crustacean evolution Holocene micropaleontology paleoenvironment sea level change sedimentology Argentina Atlantic Ocean Atlantic Ocean (South) Rio de la Plata South America Foraminifera Ostracoda
spellingShingle	Argentina benthic foraminifera mid-Holocene sea-level changes ostracoda SW South Atlantic Benthic foraminifera Benthic microfauna Ostracoda Clay Coastal zones Marine biology Oceanography Sand Silt Sediments benthos crustacean evolution Holocene micropaleontology paleoenvironment sea level change sedimentology Argentina Atlantic Ocean Atlantic Ocean (South) Rio de la Plata South America Foraminifera Ostracoda Laprida, C. Chapori, N.G. Violante, R.A. Compagnucci, R.H. Mid-Holocene evolution and paleoenvironments of the shoreface-offshore transition, north-eastern Argentina: New evidence based on benthic microfauna
topic_facet	Argentina benthic foraminifera mid-Holocene sea-level changes ostracoda SW South Atlantic Benthic foraminifera Benthic microfauna Ostracoda Clay Coastal zones Marine biology Oceanography Sand Silt Sediments benthos crustacean evolution Holocene micropaleontology paleoenvironment sea level change sedimentology Argentina Atlantic Ocean Atlantic Ocean (South) Rio de la Plata South America Foraminifera Ostracoda
description	A sedimentary record spanning 5792-5511 cal yr BP and 3188-2854 cal yr BP was recovered at 36° 45′ 43″ S-56 ° 37′ 13″ W, south-west South Atlantic. The sedimentological features and micropaleontological (benthic foraminifera and ostracoda) content were analyzed in order to reconstruct paleoenvironmental conditions. Considerable environmental fluctuations are indicated by all these proxies. Five different stages were distinguished: Stage 1 (ca. 5800-5000 cal yr BP) consists of muddy sand with abundant microfossils. In this interval, species typical for inner marine shelf environments maintained a high abundance. Stage 2 consists of plastic light greenish grey clays barren of microfossils, and probably represents fluvial input from the de la Plata River to the shelf contemporaneous of a lowering of sea level. Stage 3 is composed of brownish yellow sandy silts, and represents increasing marine conditions in the area as reflected by higher faunal diversity and typical foraminifera of inner shelf environments. Stage 4 is made of homogeneous mud, barren of microfossil, which represents a new pulse of fluvial input to the shelf in consequence of a new fall in sea level. The final part of the core (Stage 5) is a coarsening upward sequence, grading from greeny brown clayey sandy silts to coarse shelly sands and represents the modern sedimentation in the area. This interpretation strengthens the stepped model of late-Holocene sea-level fall between 5511-5792 cal yr BP and 2854-3188 cal yr BP in Buenos Aires coast, and agrees with the relative sea-level history previously proposed by some authors from western South Atlantic coasts. © 2007 Elsevier B.V. All rights reserved.
format	JOUR
author	Laprida, C. Chapori, N.G. Violante, R.A. Compagnucci, R.H.
author_facet	Laprida, C. Chapori, N.G. Violante, R.A. Compagnucci, R.H.
author_sort	Laprida, C.
title	Mid-Holocene evolution and paleoenvironments of the shoreface-offshore transition, north-eastern Argentina: New evidence based on benthic microfauna
title_short	Mid-Holocene evolution and paleoenvironments of the shoreface-offshore transition, north-eastern Argentina: New evidence based on benthic microfauna
title_full	Mid-Holocene evolution and paleoenvironments of the shoreface-offshore transition, north-eastern Argentina: New evidence based on benthic microfauna
title_fullStr	Mid-Holocene evolution and paleoenvironments of the shoreface-offshore transition, north-eastern Argentina: New evidence based on benthic microfauna
title_full_unstemmed	Mid-Holocene evolution and paleoenvironments of the shoreface-offshore transition, north-eastern Argentina: New evidence based on benthic microfauna
title_sort	mid-holocene evolution and paleoenvironments of the shoreface-offshore transition, north-eastern argentina: new evidence based on benthic microfauna
url	http://hdl.handle.net/20.500.12110/paper_00253227_v240_n1-4_p43_Laprida
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Mid-Holocene evolution and paleoenvironments of the shoreface-offshore transition, north-eastern Argentina: New evidence based on benthic microfauna

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