Data/hora: 07/06/2024 00:23:05

Provedor de dados: | 41
País: | Argentina
Título: | Impact of storms on Pliocene benthic foraminiferal assemblages of southwestern Spain
Autores: | González-Regalado,María Luz; Ruiz,Francisco; Abad,Manuel; Civis,Jorge; González Delgado,José Ángel; Muñoz,Juan Manuel; García,Edith Xio Mara; Pendón,José Gabriel; Toscano,Antonio.
Data: | 2009-06-01
Ano: | 2009
Palavras-chave: | Benthic foraminifera; Storms; Lower Pliocene; SW Spain.
Resumo: | Lithostratigraphical and faunal analyses of five Pliocene sections located in the southwestern Guadalquivir Basin (S Spain) permit reveal three main facies, which represent shallow marine fairweather conditions (FA-1), storm events (FA-2) and littoral/fluvial environments (FA-3). The vertical disposition of these facies indicates a regressive sequence. The statistical study of foraminiferal populations revealed five infralittoral and circalittoral assemblages. Vertical and horizontal variations among these assemblages, the P/B ratio and four diversity indices, together with the mollusc distributions, suggest the presence of a shallow marine palaeoenvironment in this area in the Lower Pliocene, with an increasing depth towards the southwestern. The main effects from storm events on the foraminiferal faunas are a slightly decrease of individuals and species, and a marked drop in the P/B ratio. The poststorm conditions are characterized by: a) a higher number of individuals; b) a progressive increase in the P/B ratio and c) small increases in the remaining indices.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142009000200011
Editor: | Asociación Paleontológica Argentina
Formato: | text/html
Fonte: | Ameghiniana  v.46 n.2 2009
Fonte: | info:eu-repo/semantics/openAccess