Late pleistocene and holocene loess deposits of the Southeastern Buenos Aires province, Argentina

The Late Pleistocene and Holocene loess deposits of the SE Buenos Aires province are composed of four allostratigraphic units that represent four episodes of loess deposition. The first and the second episodes occurred in Late Pleistocene times. The second episode was followed by a soil forming inte...

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Autores principales: Zárate, Marcelo Arístides, Blasi, Adriana Mónica
Formato: Articulo
Lenguaje:Inglés
Publicado: 1991
Materias:
Geología
Holocene
Tephra
Late Pleistocene
Volcaniclastic
Coarse silt
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/139235
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-139235
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Holocene
Tephra
Late Pleistocene
Volcaniclastic
Coarse silt
spellingShingle Geología
Holocene
Tephra
Late Pleistocene
Volcaniclastic
Coarse silt
Zárate, Marcelo Arístides
Blasi, Adriana Mónica
Late pleistocene and holocene loess deposits of the Southeastern Buenos Aires province, Argentina
topic_facet Geología
Holocene
Tephra
Late Pleistocene
Volcaniclastic
Coarse silt
description The Late Pleistocene and Holocene loess deposits of the SE Buenos Aires province are composed of four allostratigraphic units that represent four episodes of loess deposition. The first and the second episodes occurred in Late Pleistocene times. The second episode was followed by a soil forming interval (Early Holocene to Mid-Holocene times). The third episode took place at about 5000 yr BP, after the Holocene sea-level maximum when marine regression began. The fourth episode constitutes a historical event of only local significance. Loess shows a fairly constant granulometric and mineralogical composition. The modal fraction consists of very fine sand and coarse silt (3 to 5 phi). They are classified as sandy silts or silty sands. Three grain-size subpopulations are differentiated: coarse, medium and fine. The medium-size subpopulation, which is the most important, consists of most of the very fine sand and coarse silt. It is thought to be transported by modified saltation and short-term suspension during local dust-storms. The mineralogical composition of loess consists of a volcaniclastic assemblage derived mainly from reworked pyroclastic deposits, primary tephras and volcaniclastic sediments. The source area of these materials was located in the lower Colorado river valley about 400 km SW of the studied area. There was also a direct supply by volcanic ash falls.
format Articulo
Articulo
author Zárate, Marcelo Arístides
Blasi, Adriana Mónica
author_facet Zárate, Marcelo Arístides
Blasi, Adriana Mónica
author_sort Zárate, Marcelo Arístides
title Late pleistocene and holocene loess deposits of the Southeastern Buenos Aires province, Argentina
title_short Late pleistocene and holocene loess deposits of the Southeastern Buenos Aires province, Argentina
title_full Late pleistocene and holocene loess deposits of the Southeastern Buenos Aires province, Argentina
title_fullStr Late pleistocene and holocene loess deposits of the Southeastern Buenos Aires province, Argentina
title_full_unstemmed Late pleistocene and holocene loess deposits of the Southeastern Buenos Aires province, Argentina
title_sort late pleistocene and holocene loess deposits of the southeastern buenos aires province, argentina
publishDate 1991
url http://sedici.unlp.edu.ar/handle/10915/139235
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AT blasiadrianamonica latepleistoceneandholoceneloessdepositsofthesoutheasternbuenosairesprovinceargentina
bdutipo_str Repositorios
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