Palynologic data from Aquitaine (SW France) Middle Miocene Sables Fauves Formation. Climatic evolution


Autoria(s): Gardère, P.; Pais, João
Data(s)

21/01/2011

21/01/2011

2007

Resumo

Climatic reconstructions based on palynological data from Aquitaine outcrops emphasize an important degradation phase during the Lower Serravallian. Climatic and environmental changes can be related to sea-level variations (Bur 5 / Lan 1, Lan 2 / Ser 1 and Ser 2 cycles). Transgressive phases feature warmer conditions and more open environments whereas regressive phases are marked by a cooler climate and an extent of the forest cover. From Langhian to Middle Serravallian, a general cooling is highlighted, with disappearance of most megathermic taxa and a transition from warm and dry climate to warm-temperate and much more humid conditions. Conclusions are consistent with studies on bordering areas and place the major degradation phase around 14 My. The palynologic data allow filling a gap in the climatic evolution of Southern France, as a connection between Lower and Upper Miocene, both well recorded. These results document, on Western Europe scale, latitudinal climatic gradient across Northern hemisphere while featuring a transition between Mediterranean area and northeastern Atlantic frontage.

Identificador

http://hdl.handle.net/10362/4915

Idioma(s)

eng

Publicador

Departamento de Ciências da Terra

Direitos

openAccess

Palavras-Chave #Palynology #Paleoclimate #Langhian #Serravallian #Miocene #Aquitaine #SW France
Tipo

article