| Registro completo |
| Provedor de dados: |
Ameghiniana
|
| País: |
Argentina
|
| Título: |
Holocene sea-level change inferred from palynological data in the Beagle Channel, southern Tierra del Fuego, Argentina
|
| Autores: |
Borromei,Ana M.
Quattrocchio,Mirta
|
| Data: |
2007-03-01
|
| Ano: |
2007
|
| Palavras-chave: |
Palynology
Paleoenvironment
Holocene transgression
Bahía Lapataia
Beagle Channel
Tierra del Fuego
Argentina
|
| Resumo: |
An early-middle Holocene section in Bahía Lapataia (54º 50' S, 68º 34' W), Beagle Channel, Tierra del Fuego, Argentina has been examined taking into account its sporomorphs and organic-walled microplankton. The palynological assemblage suggests nearshore environments. Two relatively higher sea levels were identified by the increased abundance of organic-walled dinoflagellate cysts (Brigantedinium spp., Selenopemphix sp., Operculodinium centrocarpum sensu Wall and Dale, Spiniferites spp.), the acritarch Halodinium sp. and zoomorph remains (test linings of foraminifera and copepod egg-envelopes). The littoral vegetation at the time of the marine incursion was mainly arboreal, as can be seen in the pollen records by significant increase in Nothofagus dombeyi type frequencies, while a forest-steppe vegetational pattern developed regionally. After comparison with another nearby fossil marine terrace, the palynological analysis has demonstrated that these terraces represent the same transgressive-regressive event. The relative altitudinal differences between these terraces in the area may be the result of seismotectonic activity during the Holocene.
|
| Tipo: |
Info:eu-repo/semantics/article
|
| Idioma: |
Inglês
|
| Identificador: |
http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000100011
|
| Editor: |
Asociación Paleontológica Argentina
|
| Formato: |
text/html
|
| Fonte: |
Ameghiniana v.44 n.1 2007
|
| Direitos: |
info:eu-repo/semantics/openAccess
|
