Utilize este identificador para referenciar este registo: http://hdl.handle.net/10362/4915
Título: Palynologic data from Aquitaine (SW France) Middle Miocene Sables Fauves Formation. Climatic evolution
Autor: Gardère, P.
Pais, João
Palavras-chave: Palynology
Paleoclimate
Langhian
Serravallian
Miocene
Aquitaine
SW France
Data: 2007
Editora: Departamento de Ciências da Terra
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.
URI: http://hdl.handle.net/10362/4915
Aparece nas colecções:FCT: DCT - Ciências da Terra

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