Record of a nonbarred clastic shoreline

The morphology of wave-dominated clastic shorelines (i.e., foreshore and upper-shoreface sediments) can vary from barred to nonbarred, though the ancient record of nonbarred, sand-dominated shorelines has yet to be recognized. Here, a facies and quantitative architectural analysis of a clastic succe...

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Autores principales: Isla, Manuel Fermín, Schwarz, Ernesto, Veiga, Gonzalo Diego
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Ciencias Naturales
Geología
clastic shorelines
rock record
Holocene
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/131696
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-131696
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Geología
clastic shorelines
rock record
Holocene
spellingShingle Ciencias Naturales
Geología
clastic shorelines
rock record
Holocene
Isla, Manuel Fermín
Schwarz, Ernesto
Veiga, Gonzalo Diego
Record of a nonbarred clastic shoreline
topic_facet Ciencias Naturales
Geología
clastic shorelines
rock record
Holocene
description The morphology of wave-dominated clastic shorelines (i.e., foreshore and upper-shoreface sediments) can vary from barred to nonbarred, though the ancient record of nonbarred, sand-dominated shorelines has yet to be recognized. Here, a facies and quantitative architectural analysis of a clastic succession characterized by sandy inclined beds is presented and interpreted as the record of a high-gradient, nonbarred shoreline. Inclined beds dip seaward, have a tangential geometry (<3 m height, <40 m length, <11° dip), and are composed of planar lamination along the foresets and subordinate small-scale trough cross-bedding in the bottomsets. This facies distribution reflects a steep beach profile with a narrow surf zone and the development of plane beds both in foreshore and proximal upper-shoreface settings. Successive packages of inclined beds (a few tens of meters wide) are interpreted as the seaward accretion of this shoreline morphology, producing distinctive architectural elements (foresets and bottomsets). For the first time, we propose diagnostic criteria for identification in the rock record of the widely used modern nonbarred clastic shoreline model, and we contrast them with classical facies models of barred systems. Moreover, we discuss similarities and differences with radar-based Holocene coastal architectural elements, highlighting the need to incorporate detailed two-dimensional quantitative studies for refining the reconstruction of deep-time and recent clastic shorelines.
format Articulo
Articulo
author Isla, Manuel Fermín
Schwarz, Ernesto
Veiga, Gonzalo Diego
author_facet Isla, Manuel Fermín
Schwarz, Ernesto
Veiga, Gonzalo Diego
author_sort Isla, Manuel Fermín
title Record of a nonbarred clastic shoreline
title_short Record of a nonbarred clastic shoreline
title_full Record of a nonbarred clastic shoreline
title_fullStr Record of a nonbarred clastic shoreline
title_full_unstemmed Record of a nonbarred clastic shoreline
title_sort record of a nonbarred clastic shoreline
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/131696
work_keys_str_mv AT islamanuelfermin recordofanonbarredclasticshoreline
AT schwarzernesto recordofanonbarredclasticshoreline
AT veigagonzalodiego recordofanonbarredclasticshoreline
bdutipo_str Repositorios
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