%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture non répertoriées par l'AERES
%A Melo, M.S. de
%A Coimbra, A.M.
%A Ybert, Jean-Pierre
%A Brandt Neto, M.
%T Evidencias paleoclimaticas em sedimentos neocenozoicos da porçao centro-leste do estado de Sao Paulo
%D 1996
%L fdi:010011788
%G POR
%J Ciencias Exatas e da Terra
%K QUATERNAIRE ; PALEOCLIMAT ; PALEOENVIRONNEMENT ; SEDIMENTOLOGIE
%K BRESIL ; SAO PAULO
%N 1
%P 71-84
%U https://www.documentation.ird.fr/hor/fdi:010011788
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_47-48/010011788.pdf
%V 2
%W Horizon (IRD)
%X Stratigraphic studies on Neocenozoic continental deposits in the east of the state of Sao Paulo, southeastern Brazil, revealed several potential paleoclimatic indicators : buried charcoal and wood pieces ; peat and organic mud layers ; pollen, spore, diatom and sponge population changes ; clay mineral changes. Radiocarbon ages of charcoal pieces from colluvial-elluvial sandy-clayey covers and soils ranged from 3950 to 8800 years BP, with most samples in the interval between 6500 and 8500 years BP. This interval fits with dry climatic phases indicated in southern and southeastern Brazil by other methods. The charcoal pieces presumably point out fires during Holocene dry climatic phases, which could be of short term, as present El Nino events, or longer. Increasing charcoal radiocarbon dating, together with anthracological studies (charcoal taxonomy) and correlation with other paleoclimatic indicators will improve the understanding of fire events and Quaternary paleoclimatic cycles. (Résumé d'auteur)
%$ 064GEOQUA