Artículo
Microbial mat contribution to the formation of an evaporitic environment in a temperate-latitude ecosystem
Perillo, Vanesa Liliana
; Maisano, Lucia
; Martinez, Ana María; Quijada, Isabel Emma; Cuadrado, Diana Graciela
Fecha de publicación:
08/2019
Editorial:
Elsevier Science
Revista:
Journal Of Hydrology
ISSN:
0022-1694
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
An evaporitic environment is characterized by having high salinity, climatic, and hydrological factors that promote a negative water balance; however, biological factors may also influence their development. Modern coastal flat Paso Seco (40°33′S; 62°14′W) is located in a semi-arid region with low precipitation and dry winds coming mainly from the NW. The site is an old tidal channel, which nowadays behaves like a shallow coastal saline-like basin, separated from the sea by a sand barrier, which the sea periodically overcomes, flooding the flat with eventual water evaporation. Microbial mats of up to 1 cm thick colonize the sandy sediments of this evaporitic environment. Water samples were taken during five field trips (2017–2018) from interstitial water of the flat, a tidal creek that crosses the flat, and two shallow tidal depressions (TDs) within the flat with different degrees of evaporation. In comparison to the sea, the maximum salinity values measured in Austral spring (September 2017) in the tidal creek were doubled, tripled in interstitial water, and 5.9 to 8 times higher in TDs. Ionic concentration denotes that evaporite chemical divides are followed as water evaporates, corresponding to the presence of CaCO3, gypsum and halite found in TDs. On-site permeability of microbial mat-covered surfaces presented semi-pervious properties. Microbial mat presence is condition for CaCO3, gypsum, and halite precipitation as they allow for water retention and its consequent evaporation due to the impermeability they confer to the sedimentary surface. Thus, microbial mats are a biological factor affecting the development of an evaporitic environment.
Palabras clave:
CALCIUM CARBONATE
,
EVAPORITE
,
SALINE BASIN
,
SALINITY
,
WATER RETENTION
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IADO)
Articulos de INST.ARG.DE OCEANOGRAFIA (I)
Articulos de INST.ARG.DE OCEANOGRAFIA (I)
Citación
Perillo, Vanesa Liliana; Maisano, Lucia; Martinez, Ana María; Quijada, Isabel Emma; Cuadrado, Diana Graciela; Microbial mat contribution to the formation of an evaporitic environment in a temperate-latitude ecosystem; Elsevier Science; Journal Of Hydrology; 575; 8-2019; 105-114
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